CN117450208A - Marine interconnection type liquid-gas magnetorheological vibration isolation device - Google Patents
Marine interconnection type liquid-gas magnetorheological vibration isolation device Download PDFInfo
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- CN117450208A CN117450208A CN202311567487.7A CN202311567487A CN117450208A CN 117450208 A CN117450208 A CN 117450208A CN 202311567487 A CN202311567487 A CN 202311567487A CN 117450208 A CN117450208 A CN 117450208A
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- 238000002955 isolation Methods 0.000 title claims abstract description 227
- 238000013016 damping Methods 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 83
- 239000007789 gas Substances 0.000 claims description 77
- 230000005291 magnetic effect Effects 0.000 claims description 69
- 230000005389 magnetism Effects 0.000 claims description 34
- 239000006249 magnetic particle Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 230000020169 heat generation Effects 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/064—Units characterised by the location or shape of the expansion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
- F16F2224/045—Fluids magnetorheological
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
- F16F2224/046—Fluids pneumatic
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses an interconnection type liquid-gas magneto-rheological vibration isolation device for a ship, which comprises at least one group of vibration isolation units for supporting, wherein each vibration isolation unit comprises two liquid-gas vibration isolators and a magneto-rheological valve for regulating damping, each liquid-gas vibration isolator is provided with a hydraulic cylinder, a vibration isolation support column arranged in the hydraulic cylinder in a lifting manner and a piston arranged in the vibration isolation support column in a lifting manner, the vibration isolation support column, the first hydraulic chamber, the second hydraulic chamber and the sealing air chamber are in sealing fit to form a first separated hydraulic cavity, a second separated hydraulic cavity and a sealing air cavity, buffer gas is arranged in the sealing air cavity so as to provide vertical rigidity of each liquid-gas vibration isolator, magneto-rheological liquid is arranged in each of the first hydraulic cavity and the second hydraulic cavity, the first separated hydraulic cavity of one liquid-gas vibration isolator is connected with the second separated hydraulic cavity of the other liquid-gas vibration isolator of the same group through the magneto-rheological valve so as to form interconnection arrangement, and the semi-active vibration isolation of the supported body in a ship body in a rolling or pitching state is ensured under different loads and different frequencies.
Description
Technical Field
The invention relates to the technical field of ship vibration reduction, in particular to an interconnection type liquid-gas magnetorheological vibration isolation device for a ship.
Background
The vibration isolation platform or the vibration isolation system utilizes the rigidity and the damping of the vibration isolator to reduce the transmission of vibration, and the specific working principle is that the running equipment is supported on a hull base structure through the vibration isolator, and the dynamic excitation force transmitted to the base is smaller than the equipment excitation force by utilizing the rigidity and the damping of the vibration isolator; the prior vibration isolation platform mainly comprises a passive vibration isolation platform, an active vibration isolation platform and a semi-active vibration isolation platform.
After the passive vibration isolation platform is designed and fixed, vibration damping parameters (such as rigidity of a vibration isolation system) cannot be changed, and the rigidity of the vibration isolation system cannot be balanced between vibration isolation performance and posture maintaining performance, so that actual requirements cannot be met.
The active vibration isolation platform has a relatively large vibration reduction parameter regulation and control range, and can theoretically achieve the optimal performance, but because external energy or external control force is needed to realize the adjustment of controllable force, a large amount of energy consumption is needed as a cost, and a control system is complex, the risk of unstable or failure of the vibration isolation system can exist.
The existing semi-active vibration isolation platform adopts a magneto-rheological damper or a variable throttle valve and other vibration reduction technologies, is widely applied to a marine vibration isolation system, and can adjust the damping of the vibration isolation system, but cannot adjust the rigidity of the vibration isolation system, so that the rigidity of the vibration isolation system cannot be balanced between the vibration isolation performance and the gesture maintaining performance.
Disclosure of Invention
Therefore, the invention aims to solve the problems, and provides the marine interconnected liquid-gas magnetorheological vibration isolation device which can realize semi-active vibration reduction by adjusting the rigidity and the damping of a vibration reduction system and realize attitude control by applying an interconnection technology.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
an interconnection type liquid-gas magneto-rheological vibration isolation device for a ship comprises at least one group of vibration isolation units for supporting; the vibration isolation unit comprises two liquid-gas vibration isolators and a magneto-rheological valve for adjusting the damping of the vibration isolation unit; the liquid-gas vibration isolator is provided with a hydraulic cylinder, a vibration isolation support column which is arranged in the hydraulic cylinder in a lifting manner and a piston which is arranged in the vibration isolation support column in a lifting manner; the hydraulic cylinder, the vibration isolation support column and the piston are in sealing fit to form a first hydraulic cavity, a second hydraulic cavity and a sealing air cavity which are spaced apart from each other, the first hydraulic cavity and the second hydraulic cavity are separated by the vibration isolation support column to form a space arrangement, and the first hydraulic cavity and the sealing air cavity are separated by the piston to form a space arrangement; buffer gas is arranged in the sealed air cavity to provide the vertical rigidity of the liquid-gas vibration isolator; the first hydraulic cavities and the second hydraulic cavities are respectively internally provided with magnetorheological fluid, and the first hydraulic cavity of one liquid-gas vibration isolator of each group is connected with the second hydraulic cavity of the other liquid-gas vibration isolator of the same group through the magnetorheological valve to form interconnection arrangement so as to ensure the attitude stability of the supported body when the ship body rolls or pitching, and ensure that the marine interconnection type liquid-gas magnetorheological vibration isolation device realizes semi-active vibration isolation in a wide frequency range under different loads and different frequencies.
Further, the vibration isolation unit further comprises a magnetorheological fluid connecting pipe, wherein the first hydraulic cavity of one liquid-gas vibration isolator of each group is connected with the second hydraulic cavity of the other liquid-gas vibration isolator of the same group through the magnetorheological fluid connecting pipe, so that a pipe wall in the magnetorheological fluid connecting pipe and magnetorheological fluid flowing in the magnetorheological fluid connecting pipe are provided with viscous friction damping, and heat generated by friction heat generation is dissipated to dissipate vibration energy; the magnetorheological valve is arranged on the magnetorheological fluid connecting pipe.
Further, the magneto-rheological valve comprises a magnetic valve body, a coil assembly, at least two magnetic rings and a magnetism isolating ring, wherein the coil assembly is assembled on the valve body and can adjust current; the valve body is internally provided with an installation cavity for accommodating the magnetic conducting ring and the magnetism isolating ring, and a first valve port and a second valve port which are respectively positioned at two sides of the valve body, the magnetic conducting ring and the magnetism isolating ring are in sealing fit with each other and are assembled in the installation cavity, the inner cavities of the magnetic conducting ring and the magnetism isolating ring are communicated, and a magnetorheological fluid channel which is respectively communicated with the first valve port and the second valve port is formed; the opening of the first hydraulic cavity of one liquid-gas vibration isolator of each group is connected with the first valve port, and the opening of the second hydraulic cavity of the other liquid-gas vibration isolator of the same group is connected with the second valve port.
Further, the cross section of the magnetism isolating ring is triangular, trapezoidal or rectangular; the cross section shape of the magnetic conduction ring corresponds to the cross section shape of the magnetism isolating ring so as to form sealing fit.
Further, the coil assembly is electrified to form an induction magnetic field,
the magnetic conducting ring is magnetized, a pair of magnetic poles are formed on two sides of the magnetic isolation ring, and a gradient magnetic field is formed on the periphery of the end part of the magnetic isolation ring, which is close to the magnetorheological fluid channel, so that magnetic particles of the magnetorheological fluid are magnetically adsorbed and accumulated on the inner side of the magnetic isolation ring to form an accumulation part; the stacking part is surrounded to form a damping channel, and the sectional area of the damping channel is the effective flow area of the magnetorheological fluid channel; the sectional area of the damping channel or the yield damping of the magnetorheological fluid corresponds to the current value of the coil assembly, so that the flow resistance of the magnetorheological fluid is correspondingly adjusted to adjust the damping of the vibration isolation unit.
Furthermore, the supported body is mechanical equipment, and the buffer gas is inert gas or nitrogen gas, so that the natural frequency of the vibration isolation unit is kept away from the frequency conversion of the supported body during operation.
Further, the number of the vibration isolation units is at least two, and the two liquid-gas vibration isolators of part of the vibration isolation units are arranged along the rolling direction of the ship body so as to ensure the attitude stability of the supported body in the rolling direction; in addition, two liquid-gas vibration isolators which are externally grouped are arranged along the pitching direction of the ship body so as to ensure the posture stability of the supported body in the pitching direction.
Further, the number of the vibration isolation units is set to be one, the hydraulic cylinders of the two liquid-gas vibration isolators are respectively fixed on the ship body, and the supported bodies are fixed on the vibration isolation support columns of the two liquid-gas vibration isolators to form a single-layer vibration isolation platform.
Further, the vibration isolation device further comprises a vibration isolation plate, and the vibration isolation units are assembled on one side or two sides of the vibration isolation plate to form a double-layer vibration isolation platform.
Further, the floating raft vibration isolation platform further comprises an intermediate raft frame, and the vibration isolation units are assembled on one side or two sides of the intermediate raft frame to form the floating raft vibration isolation platform.
The technical scheme provided by the invention has the following beneficial effects:
the vibration isolation system is characterized in that the supported body is elastically supported by buffer gas in the sealed air cavity, corresponding different air pressures are formed, and corresponding vertical rigidity is further formed, so that the periodic vibration caused by the disturbance of the ship body and the disturbance of the supported body is buffered, and the vertical rigidity of the vibration isolation system can be further effectively reduced on the premise that the posture of the supported body is kept, so that the natural frequency of the vibration isolation system is reduced, and the vibration isolation performance of the vibration isolation system under a low-frequency working condition is ensured.
The anti-roll stiffness and the anti-pitch stiffness can be effectively improved under the condition that the vertical stiffness of the vibration isolation system is not affected by the interconnection arrangement of at least one group of vibration isolation units and the magneto-rheological valve used for adjusting the damping of the vibration isolation units, the attitude stability of the supported body in the rolling or pitching process of the ship body is ensured, and meanwhile, the vibration isolation system is ensured to realize semi-active vibration isolation in a wide frequency range under different loads and different frequencies.
Drawings
Fig. 1 is a schematic structural diagram of an interconnection type liquid-gas magnetorheological vibration isolation device for a ship in a first embodiment;
figure 2 shows a cross-sectional view of the liquid-gas vibration isolator of the first embodiment;
FIG. 3 is a cross-sectional view of a magnetorheological valve according to a first embodiment;
FIG. 4 is a schematic diagram showing the operation of the magneto-rheological valve in the energized state in the first embodiment;
fig. 5 is a schematic diagram of an interconnection type liquid-gas magnetorheological vibration isolation device for a ship in the second embodiment;
fig. 6 is a schematic diagram of an interconnection type liquid-gas magnetorheological vibration isolation device for a ship in a third embodiment.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
Example 1
Referring to fig. 1 to 3, an embodiment provides an interconnection type liquid-air magnetorheological vibration isolation device for a ship (hereinafter referred to as a vibration isolation platform or vibration isolation system), the vibration isolation platform comprises a group of vibration isolation units for supporting, the vibration isolation units comprise two liquid-air isolators 1 and a magnetorheological valve 2 for adjusting damping of the vibration isolation units, the liquid-air isolators 1 are provided with a hydraulic cylinder 6, a vibration isolation support column 7 arranged in the hydraulic cylinder 6 in a lifting manner and a piston 10 arranged in the vibration isolation support column 7 in a lifting manner, the hydraulic cylinder 6, the vibration isolation support column 7 and the piston 10 are in sealing fit to form a first hydraulic cavity 16, a second hydraulic cavity 15 and a sealing air cavity 17 at intervals, the first hydraulic cavity 16 and the second hydraulic cavity 15 are separated by the vibration isolation support column 7 to form interval arrangement, the first hydraulic cavity 16 and the sealing air cavity 17 are separated by the piston 10 to form interval arrangement, buffer gas is arranged in the sealing air cavity 17 to provide vertical rigidity of the liquid-air isolators 1, magnetorheological fluid is arranged in the first hydraulic cavity 16 and the second hydraulic cavity 15, and one of the first hydraulic cavities 16 and the second hydraulic cavities 1 of each group are connected with the other hydraulic cavity 2 through the valve in the same frequency range of the vibration isolation platform or the vibration isolation platform to ensure that the vibration isolator is not in the same frequency or vibration isolation platform to form the vibration isolation platform.
In this embodiment, the vibration isolation unit further includes a magnetorheological fluid connection pipe 5, the first hydraulic chamber 16 of one of the liquid-gas vibration isolators 1 of each group is connected with the second hydraulic chamber 15 of the other liquid-gas vibration isolator 1 of the same group through the magnetorheological fluid connection pipe 5, so that a pipe wall in the magnetorheological fluid connection pipe 5 and the magnetorheological fluid flowing in the magnetorheological fluid connection pipe 5 have viscous friction damping, and heat generated by the dissipation of the friction heat is dissipated to dissipate vibration energy, and the magnetorheological fluid connection pipe 5 is equipped with a magnetorheological valve 2 to form a semi-active vibration isolation arrangement.
The viscous friction damping between the tube wall in the magnetorheological fluid connection tube 5 and the flowing magnetorheological fluid is certain.
If the damping of the magneto-rheological valve 2 is increased, the system damping (comprising friction damping and damping of the magneto-rheological valve 2) of the vibration isolation platform is obviously increased, so that the vibration isolation effect of the vibration isolation platform under the low-frequency working condition is improved, but the vibration isolation effect of the vibration isolation platform is not facilitated under the medium-frequency working condition.
If the damping of the magneto-rheological valve 2 is reduced, the system damping of the vibration isolation platform is obviously reduced, so that the vibration isolation effect of the vibration isolation platform under the medium-frequency working condition is improved, but the vibration isolation effect of the vibration isolation platform is not facilitated under the low-frequency working condition.
Therefore, the damping of the magneto-rheological valve 2 is regulated so that the system damping of the vibration isolation platform is matched according to the actual working condition, and semi-active vibration isolation is realized.
In addition, the supported body is mechanical equipment (for example, when the mechanical equipment is a diesel engine, the vibration frequency of the diesel engine at a high rotating speed is about 500Hz, and the vibration frequency is in a frequency range of an intermediate frequency of 20-2000 Hz), the hydraulic cylinders 6 of the two liquid-gas vibration isolators 1 are respectively fixed on the ship body, and the supported body is fixed on the vibration isolation supporting columns 7 of the two liquid-gas vibration isolators 1, so that a single-layer vibration isolation platform is formed.
As shown in fig. 2, the liquid-gas vibration isolator 1 further includes a guide cover 8, an end cover 9, a stop end cover 11, a pipe joint 12, a guide belt 13, and a sealing ring, the hydraulic cylinder 6 has an upper open assembly cavity, the vibration isolation support column 7 has a support surface 73, a first circumferential wall 72, and a second circumferential wall 71 connected between the support surface 73 and the first circumferential wall 72, and the support surface 73 and the first circumferential wall 72 are disposed up and down.
The second circumferential wall 71 of the vibration isolation support column 7 and the supporting surface 73 enclose to form a containing cavity with a lower opening, the first circumferential wall 72 of the vibration isolation support column 7 and the inner circumferential wall of the hydraulic cylinder 6 form sliding connection through the guide belt 13 and form sealing fit through the sealing ring, so that the vibration isolation support column 7 can slide up and down or lift in the hydraulic cylinder 6 under the action of external force (such as external excitation force).
The guide cover 8 above the first circumferential wall 72 of the vibration isolation support column 7 is fixed on the inner circumferential wall of the hydraulic cylinder 6 at the two sides of the upper opening through the end cover 9 and is in sealing fit through a sealing ring, the inner side of the guide cover 8 and the second circumferential wall 71 of the vibration isolation support column 7 are in sliding connection through the guide belt 13 and are in sealing fit through the sealing ring, and at the moment, the inner circumferential wall of the hydraulic cylinder 6, the guide cover 8 and the second circumferential wall 71 of the vibration isolation support column 7 are enclosed to form a second hydraulic cavity 15 surrounding the outer circumference of the vibration isolation support column 7.
The piston 10 is slidably assembled in the accommodating cavity of the vibration isolation support column 7, two ends of the piston 10 are slidably connected with the second circumferential wall 71 of the vibration isolation support column 7 through the guide belt 13 and are in sealing fit through the sealing ring, at this time, the piston 10, the second circumferential wall 71 of the vibration isolation support column 7 and the supporting surface 73 of the vibration isolation support column 7 are enclosed to form a closed sealing air cavity 17, and the piston 10, the first circumferential wall 72 of the vibration isolation support column 7, the second circumferential wall 71 of the vibration isolation support column 7 and the bottom of the accommodating cavity of the vibration isolation support column 7 are enclosed to form a first hydraulic cavity 16.
A stop end cap 11 is provided at the lower opening of the receiving cavity of the vibration isolation support column 7 to prevent the piston 10 from being pushed out of the receiving cavity of the vibration isolation support column 7 and at the same time to perform a sealing function.
The guiding cover 8 and the bottom of the accommodating cavity are respectively provided with an installation hole penetrating from top to bottom, and the installation holes are provided with pipe joints 12 so as to form medium flow holes of a first hydraulic cavity 16 and a second hydraulic cavity 15, so that the medium flow hole of the first hydraulic cavity 16 of one liquid-gas vibration isolator 1 in the same group is communicated with the medium flow hole of the second hydraulic cavity 15 of the other liquid-gas vibration isolator 1 in the same group through a magnetorheological fluid connecting pipe 5 provided with a magnetorheological valve 2.
The total volume of the first hydraulic chamber 16, the second hydraulic chamber 15, the sealing air chamber 17 and the volumes in the two magnetorheological fluid connecting pipes 5 of the vibration isolation unit is fixed.
The sealed air cavity 17 with a certain volume is internally sealed with a certain amount of buffer gas, and the supported body is elastically supported by the buffer gas in the sealed air cavity 17, namely, the vibration isolation support column 7 works on the buffer gas in the sealed air cavity 17 to compress or expand the buffer gas so as to form corresponding different air pressures, and further, corresponding vertical rigidity is formed, so that the periodic vibration caused by the ship disturbance and the self disturbance of the supported body is buffered.
When the two liquid-gas isolators 1 of the vibration isolation unit are subjected to balanced excitation force or load (such as acting force when vertical vibration occurs in the vertical direction), the vertical rigidity of the vibration isolation platform depends on the air pressure in the sealed air cavity 17, and on the premise of meeting the posture maintenance of the supported body, the vertical rigidity of the vibration isolation system can be further effectively reduced, so that the natural frequency of the vibration isolation system is reduced, the vibration isolation performance of the vibration isolation system under the low-frequency (namely, the frequency range of the low frequency is 0-20 Hz) working condition is ensured, and the amplitude of the excitation force applied to the vibration isolation support column 7 is small at the moment, so that the working stroke of the vibration isolation support column 7 is short, the usage amount of magnetorheological fluid can be reduced, and the use cost is further reduced.
Through the interconnection setting of vibration isolation unit and be used for adjusting the damping magneto-rheological valve 2 of vibration isolation unit, under the circumstances that does not influence vibration isolation system's vertical rigidity, also can effectively promote anti roll rigidity and anti every single move rigidity to guarantee by the gesture stability of support body when the hull is rolled or is pitching, guarantee simultaneously that vibration isolation system realizes the semi-initiative vibration isolation in the wide band range (including low frequency range and intermediate frequency range promptly under different loads and different frequencies, and the power consumption is low moreover, compact structure, easy operation, convenience and reliable.
In another preferred embodiment, the magnetorheological valve 2 comprises a magnetic conductive valve body 21, a coil assembly 22 which is assembled on the valve body 21 and can adjust current, 4 magnetic conductive rings 23 and magnetism isolating rings 24 which are arranged between two adjacent magnetic conductive rings 23, wherein the number of the magnetism isolating rings 24 is 3, a mounting cavity which accommodates the magnetic conductive rings 23 and the magnetism isolating rings 24 and a first valve port and a second valve port which are respectively positioned at two sides of the valve body 21 are arranged in the valve body 21, the magnetic conductive rings 23 and the magnetism isolating rings 24 are in sealing fit with each other and are assembled in the mounting cavity, the inner cavities of the magnetic conductive rings 23 and the magnetism isolating rings 24 are communicated, and a magnetorheological fluid channel 25 which is respectively communicated with the first valve port and the second valve port is formed, the opening of the first hydraulic cavity 16 of one liquid-gas vibration isolator 1 of each group is connected with the first valve port, and the opening of the second hydraulic cavity 15 of the other liquid-gas vibration isolator 1 of the same group is connected with the second valve port, so that the interconnection arrangement of different hydraulic cavities of the two liquid-gas vibration isolators 1 of the vibration isolator unit is realized.
In specific implementation, the valve body 21 includes a left yoke 211 and a right yoke 212 that are fastened together, and the left yoke 211 and the right yoke 212 each have a mounting groove, and the mounting grooves of the left yoke 211 and the right yoke 212 are connected to form the mounting cavity.
The coil assembly 22 comprises a coil support and a coil assembled on the coil support, the coil support assembled with the coil is sleeved into the left magnet yoke 211 and the right magnet yoke 212 to form a whole, and the left magnet yoke 211, the magnetic conduction ring 23, the magnetism isolation ring 24 and the right magnet yoke 212 are respectively bonded together through sealing glue so as to realize sealing fit and form an integral connection structure.
The left side wall of the left magnetic yoke 211 and the right side wall of the right magnetic yoke 212 are respectively provided with a through hole communicated with the magnetorheological fluid channel 25, the opening of the through hole of the left magnetic yoke 211 is the first valve port, the opening of the through hole of the right magnetic yoke 212 is the second valve port, and the first valve port and the second valve port are respectively provided with a pipe joint 26 so as to be convenient for sealing connection with the magnetorheological fluid connecting pipe 5.
In addition, the specific magnetorheological fluid channel 25 adopts a round hole type flow channel with a larger inner diameter, so that the magnetorheological fluid channel is convenient to be suitable for the use condition of large-flow magnetorheological fluid, and can avoid the occurrence of blocking phenomenon so as to ensure the reliability of the vibration isolation platform.
The magnetorheological fluid in the prior art is a suspension formed by immersing micro-scale or nano-scale ferromagnetic particles (namely magnetic particles belonging to soft magnetic materials) in a non-magnetic carrier liquid, and the magnetorheological fluid presents low-viscosity elastic fluid under the condition of zero magnetic field; the magnetorheological fluid presents viscous fluid with high viscosity and low flow under the condition of strong magnetic field, so the magnetorheological fluid is also a viscoelastic fluid.
When the viscoelastic fluid flows in the magnetorheological fluid channel 25, if the shear force (the shear force direction is the extending direction of the magnetorheological fluid channel 25) applied to the viscoelastic fluid is greater than the yield force applied to the viscoelastic fluid by the inner wall of the magnetorheological fluid channel 25, the viscoelastic fluid can overcome the limitation of the yield force, and then the undamped flow is realized.
When the viscoelastic fluid encounters a blocking condition (e.g., the effective flow area of the magnetorheological fluid channel 25 becomes smaller), the viscoelastic fluid undergoes greater elastic deformation and develops greater compressive stress, so that the yield force exerted by the inner wall of the magnetorheological fluid channel 25 on the viscoelastic fluid also increases, and after the yield force exceeds the shear force, a damping of the viscoelastic fluid is developed, the greater the difference between the yield force and the shear force, and the greater the corresponding damping (i.e., yield damping) accordingly.
As shown in fig. 4, when the coil assembly 22 is energized to form an induced magnetic field, the magnetic conducting ring 23 is magnetized and forms a pair of magnetic poles on two sides of the magnetism isolating ring 24, that is, two magnetic poles (i.e., N pole and S pole) are located on two sides of the magnetism isolating ring 24, and a gradient magnetic field is formed on the periphery of the end portion of the magnetism isolating ring 24, which is close to the magnetorheological fluid channel 25, so that the magnetic particles 27 of the magnetorheological fluid are magnetically adsorbed and accumulated on the inner side of the magnetism isolating ring 24 to form an accumulation portion 3, the accumulation portion 3 encloses to form a damping channel, the cross-sectional area of the inner cavity of the damping channel is the effective flow area of the magnetorheological fluid channel 25, and the cross-sectional area of the inner cavity of the damping channel (or the yielding damping of the magnetorheological fluid) corresponds to the current value of the coil assembly 22, so as to form the magnetorheological valve 2 in a pinch mode.
By increasing (or decreasing) the current value of the coil assembly 22 to increase (or decrease) the field strength of the induced magnetic field to increase (or decrease) the number of magnetic particles 27 accumulated in the accumulation portion 3 inside the magnetism isolating ring 24, and thus the cross-sectional area of the damping channel to increase (or decrease) the effective flow area to increase (or decrease) the flow resistance of the magnetorheological fluid to increase (or decrease) the damping of the vibration isolating unit.
Meanwhile, the magnetic particles 27 of the magnetorheological fluid pass through the channel where the inner cavity of the magnetic conduction ring 23 is located, the magnetic particles 27 are also limited by the gradient magnetic field formed between the two ends of the magnetic conduction ring 23, and when the current value of the coil assembly 22 is increased (or decreased), the yield stress (namely the yield stress) or the yield damping of the magnetorheological fluid containing the magnetic particles 27 is increased (or decreased) accordingly.
Of course, in other embodiments, the number of the magnetism isolating rings 24 may be 1, two, or 4, etc., and the number of the magnetism isolating rings 23 matching with the magnetism isolating rings 24 is determined by the number of the magnetism isolating rings 24.
Further preferably, the cross-sectional shape of the magnetism blocking ring 24 is triangular, and the cross-sectional shape of the magnetism guiding ring 23 corresponds to the cross-sectional shape of the magnetism blocking ring 24 to form a sealing fit.
In this embodiment, the magnetic isolation ring 24 with a triangular cross section has a tip portion, the tip portion is close to the periphery of the magnetorheological fluid channel 25, two adjacent magnetic conduction rings 23 are isolated or separated by the tip portion of the magnetic isolation ring 24, and a pair of magnetic poles are formed on two sides of the magnetic isolation ring 24 respectively, namely, the N pole is located on the left side of the magnetic isolation ring 24, the S pole is located on the right side of the magnetic isolation ring 24, and the end portion of the magnetic isolation ring 24 close to the magnetorheological fluid channel 25 is the tip portion.
Because the magnetic particles 27 have good soft magnetism and magnetic permeability, when the magnetic particles 27 begin to accumulate between the two magnetic poles, a part of the magnetic particles 27 are accumulated and cover the pipeline area corresponding to the tip part, so as to form a magnetic conduction area, magnetic force lines 28 emitted by the two magnetic poles are guided into the magnetic conduction area, and simultaneously magnetize the magnetic particles 27 in the magnetic conduction area, so that strong magnetic field areas with different gradients are rapidly formed, and further more magnetic particles 27 are magnetically adsorbed into the magnetic conduction area until the accumulation part 3 and the damping channel are formed, so that the effective flow area of the magnetorheological fluid channel 25 or the flow resistance of the magnetorheological fluid can be more rapidly regulated, and the damping of the vibration isolation unit can be more rapidly regulated, so that the damping response speed of the vibration isolation platform can be increased.
Of course, in other embodiments, the cross-sectional shape of the magnetism blocking ring 24 may be trapezoidal or other shapes, such as a shape with one end being narrow and the other end being wide, or may be rectangular, and the cross-sectional shape of the magnetism blocking ring 24 is preferably triangular.
In another preferred embodiment, the buffer gas is nitrogen, so as to ensure that the natural frequency of the vibration isolation unit is far away from the frequency of rotation when the mechanical equipment is in operation, so that resonance formation is avoided, and the vibration isolation effect can be achieved.
Of course, in other embodiments, the buffer gas may also be an inert gas, such as helium.
Example two
Referring to fig. 5, a second embodiment provides an interconnection type hydraulic-pneumatic magnetorheological vibration isolation device for a ship, and the second embodiment has a substantially same structure as the first embodiment, except that: the marine interconnection type liquid-gas magnetorheological vibration isolation device further comprises vibration isolation plates 4, the vibration isolation units are respectively assembled on two sides of the vibration isolation plates 4 to form a double-layer vibration isolation platform, the anti-roll rigidity and the anti-pitch rigidity can be effectively improved under the condition that the vertical rigidity of the vibration isolation system is not affected, the gesture stability of the supported body when the ship body rolls or pitching is ensured, meanwhile, the vibration isolation system is ensured to realize semi-active vibration isolation in a wide frequency range under different loads, and the vibration isolation device is low in energy consumption, compact in structure, simple to operate, convenient and reliable.
Example III
Referring to fig. 6, a third embodiment provides an interconnection type hydraulic-pneumatic magnetorheological vibration isolation device for a ship, and the third embodiment has substantially the same structure as the first embodiment, except that: the marine interconnected liquid-gas magnetorheological vibration isolation device further comprises a middle raft frame 14, wherein the number of the vibration isolation units is 3, and the vibration isolation units are assembled on two sides of the middle raft frame 14 to form a floating raft vibration isolation platform.
In this embodiment, the 3 vibration isolation units are a first vibration isolation unit, a second vibration isolation unit and a third vibration isolation unit, where the first vibration isolation unit and the second vibration isolation unit are fixedly installed on the upper side of the middle raft frame 14, and supported bodies are fixedly installed on the vibration isolation support columns of the first vibration isolation unit and the second vibration isolation unit, the third vibration isolation unit is fixedly installed on the lower side of the middle raft frame 14, and the hydraulic cylinder of the third vibration isolation unit is fixedly installed on the hull.
Under the condition that the vertical rigidity of the vibration isolation system is not influenced, the anti-roll rigidity and the anti-pitch rigidity can be effectively improved, the gesture stability of the supported body in the process of rolling or pitching the ship body is ensured, meanwhile, the vibration isolation system is ensured to realize semi-active vibration isolation in a wide frequency range under different loads, and the vibration isolation system has the advantages of low energy consumption, compact structure, simplicity in operation, convenience and reliability.
Of course, in other embodiments, when the vibration isolation unit is assembled on one side of the middle raft frame 14, the other side of the middle raft frame 14 is assembled with vibration isolators (such as existing steel spring vibration isolators or gas spring vibration isolators) that are prior art, and will not be described in detail herein.
The number of vibration isolation units is not limited to this, and is determined according to the actual situation on site.
Example IV
The fourth embodiment provides a marine interconnection type liquid-gas magnetorheological vibration isolation device, and the structure of the fourth embodiment and the first embodiment is substantially the same, and the difference is that: the vibration isolation units are arranged in groups of at least two groups, the two liquid-gas vibration isolators of part of the vibration isolation units are arranged along the rolling direction of the ship body so as to ensure the attitude stability of the supported body in the rolling direction, and the two liquid-gas vibration isolators of the other part of the vibration isolation units are arranged along the pitching direction of the ship body so as to ensure the attitude stability of the supported body in the pitching direction.
In this embodiment, the two liquid-gas vibration isolators of the same group are divided into a first vibration isolator and a second vibration isolator.
When the ship body rolls, under the action of the subversion moment, the vibration isolation platform is under the action of the subversion moment so that the stress of the two liquid-gas vibration isolators of the same group which are arranged in the rolling direction is unbalanced, and the mechanical equipment is in an instantaneous inclined state, namely the first vibration isolator is subjected to downward pressure of the mechanical equipment so that the vibration isolation support column of the first vibration isolator is pressed into the hydraulic cylinder of the first vibration isolator, meanwhile, the second vibration isolator is subjected to upward tension of the mechanical equipment so that the vibration isolation support column of the second vibration isolator is pulled out of the hydraulic cylinder of the second vibration isolator for a certain distance, at the moment, the volume of the first hydraulic cavity of the first vibration isolator is smaller than the volume of the first hydraulic cavity of the second vibration isolator, the volume of the second hydraulic cavity of the first vibration isolator is larger than the volume of the second hydraulic cavity of the second vibration isolator, and the magnetorheological fluid connecting pipe passes through the magnetorheological fluid connecting pipe, the magnetorheological fluid in the first hydraulic cavity of the first vibration isolator is forced into the second hydraulic cavity of the second vibration isolator to increase the magnetorheological fluid in the second hydraulic cavity of the second vibration isolator, and then the vibration isolation supporting column of the second vibration isolator is driven to move downwards to reduce the volume of the first hydraulic cavity of the second vibration isolator, meanwhile, the magnetorheological fluid in the second hydraulic cavity of the second vibration isolator is forced into the first hydraulic cavity of the first vibration isolator to increase the magnetorheological fluid in the first hydraulic cavity of the first vibration isolator, and then the vibration isolation supporting column of the first vibration isolator is driven to lift upwards to reduce the volume of the first hydraulic cavity of the first vibration isolator, and then a mutual compensation mechanism of the magnetorheological fluid is formed between the first vibration isolator and the second vibration isolator through the interconnection function of a magnetorheological fluid connecting pipe, so that the vibration isolation platform is restored to the balanced attitude.
The vibration damping principle of the vibration isolation platform when the hull is pitching is similar to that of the vibration isolation platform when the hull is rolling, and will not be described in detail here.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a marine interconnection formula liquid gas magnetic current becomes vibration isolator which characterized in that: comprising at least one group of vibration isolation units for supporting;
the vibration isolation unit comprises two liquid-gas vibration isolators and a magneto-rheological valve for adjusting the damping of the vibration isolation unit;
the liquid-gas vibration isolator is provided with a hydraulic cylinder, a vibration isolation support column which is arranged in the hydraulic cylinder in a lifting manner and a piston which is arranged in the vibration isolation support column in a lifting manner;
the hydraulic cylinder, the vibration isolation support column and the piston are in sealing fit to form a first hydraulic cavity, a second hydraulic cavity and a sealing air cavity which are spaced apart from each other, the first hydraulic cavity and the second hydraulic cavity are separated by the vibration isolation support column to form a space arrangement, and the first hydraulic cavity and the sealing air cavity are separated by the piston to form a space arrangement;
buffer gas is arranged in the sealed air cavity to provide the vertical rigidity of the liquid-gas vibration isolator;
the first hydraulic cavities and the second hydraulic cavities are respectively internally provided with magnetorheological fluid, and the first hydraulic cavity of one liquid-gas vibration isolator of each group is connected with the second hydraulic cavity of the other liquid-gas vibration isolator of the same group through the magnetorheological valve to form interconnection arrangement so as to ensure the attitude stability of the supported body when the ship body rolls or pitching, and ensure that the marine interconnection type liquid-gas magnetorheological vibration isolation device realizes semi-active vibration isolation in a wide frequency range under different loads and different frequencies.
2. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1, wherein: the vibration isolation unit further comprises a magnetorheological fluid connecting pipe, wherein the first hydraulic cavity of one liquid-gas vibration isolator of each group is connected with the second hydraulic cavity of the other liquid-gas vibration isolator of the same group through the magnetorheological fluid connecting pipe, so that the pipe wall in the magnetorheological fluid connecting pipe and magnetorheological fluid flowing in the magnetorheological fluid connecting pipe are provided with viscous friction damping, and the heat formed by friction heat generation is dissipated to dissipate vibration energy; the magnetorheological valve is arranged on the magnetorheological fluid connecting pipe.
3. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1, wherein: the magneto-rheological valve comprises a magnetic valve body, a coil assembly, at least two magnetic rings and a magnetism isolating ring, wherein the magnetic valve body is magnetically conductive, the coil assembly is assembled on the valve body and can adjust current, and the magnetism isolating ring is arranged between two adjacent magnetic rings; the valve body is internally provided with an installation cavity for accommodating the magnetic conducting ring and the magnetism isolating ring, and a first valve port and a second valve port which are respectively positioned at two sides of the valve body, the magnetic conducting ring and the magnetism isolating ring are in sealing fit with each other and are assembled in the installation cavity, the inner cavities of the magnetic conducting ring and the magnetism isolating ring are communicated, and a magnetorheological fluid channel which is respectively communicated with the first valve port and the second valve port is formed; the opening of the first hydraulic cavity of one liquid-gas vibration isolator of each group is connected with the first valve port, and the opening of the second hydraulic cavity of the other liquid-gas vibration isolator of the same group is connected with the second valve port.
4. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 3, wherein: the cross section of the magnetism isolating ring is triangular, trapezoidal or rectangular; the cross section shape of the magnetic conduction ring corresponds to the cross section shape of the magnetism isolating ring so as to form sealing fit.
5. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 3, wherein: the coil assembly is electrified to form an induction magnetic field, the magnetic conducting ring is magnetized, a pair of magnetic poles are formed on two sides of the magnetic isolation ring, and a gradient magnetic field is formed on the periphery of the end part of the magnetic isolation ring, which is close to the magnetorheological fluid channel, so that magnetic particles of the magnetorheological fluid are magnetically adsorbed and accumulated on the inner side of the magnetic isolation ring to form a stacking part; the stacking part is surrounded to form a damping channel, and the sectional area of the inner cavity of the damping channel is the effective flow area of the magnetorheological fluid channel; the sectional area of the inner cavity of the damping channel or the yield damping of the magnetorheological fluid corresponds to the current value of the coil assembly, so that the flow resistance of the magnetorheological fluid is correspondingly adjusted to adjust the damping of the vibration isolation unit.
6. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1 or 2 or 3 or 4 or 5, wherein: the supported body is mechanical equipment, and the buffer gas is inert gas or nitrogen gas so as to ensure that the natural frequency of the vibration isolation unit is far away from the frequency conversion of the supported body during operation.
7. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1 or 2 or 3 or 4 or 5, wherein: the number of the vibration isolation units is at least two, and the two liquid-gas vibration isolators of part of the vibration isolation units are arranged along the rolling direction of the ship body so as to ensure the attitude stability of the supported body in the rolling direction; in addition, two liquid-gas vibration isolators which are externally grouped are arranged along the pitching direction of the ship body so as to ensure the posture stability of the supported body in the pitching direction.
8. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1 or 2 or 3 or 4 or 5, wherein: the number of the vibration isolation units is set to be one, the hydraulic cylinders of the two liquid-gas vibration isolators are respectively fixed on the ship body, and the supported bodies are fixed on the vibration isolation support columns of the two liquid-gas vibration isolators to form a single-layer vibration isolation platform.
9. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1 or 2 or 3 or 4 or 5, wherein: the vibration isolation device further comprises a vibration isolation plate, and the vibration isolation units are assembled on one side or two sides of the vibration isolation plate to form a double-layer vibration isolation platform.
10. The marine interconnecting liquid-gas magnetorheological vibration isolation device according to claim 1 or 2 or 3 or 4 or 5, wherein: the floating raft vibration isolation platform further comprises a middle raft frame, and the vibration isolation units are assembled on one side or two sides of the middle raft frame to form the floating raft vibration isolation platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311567487.7A CN117450208A (en) | 2023-11-23 | 2023-11-23 | Marine interconnection type liquid-gas magnetorheological vibration isolation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311567487.7A CN117450208A (en) | 2023-11-23 | 2023-11-23 | Marine interconnection type liquid-gas magnetorheological vibration isolation device |
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| CN117450208A true CN117450208A (en) | 2024-01-26 |
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| CN202311567487.7A Pending CN117450208A (en) | 2023-11-23 | 2023-11-23 | Marine interconnection type liquid-gas magnetorheological vibration isolation device |
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| Country | Link |
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| CN (1) | CN117450208A (en) |
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- 2023-11-23 CN CN202311567487.7A patent/CN117450208A/en active Pending
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