CN109033708B - Pressure loss calculation method for series-parallel R type automobile shock absorber - Google Patents
Pressure loss calculation method for series-parallel R type automobile shock absorber Download PDFInfo
- Publication number
- CN109033708B CN109033708B CN201810998310.5A CN201810998310A CN109033708B CN 109033708 B CN109033708 B CN 109033708B CN 201810998310 A CN201810998310 A CN 201810998310A CN 109033708 B CN109033708 B CN 109033708B
- Authority
- CN
- China
- Prior art keywords
- resistance
- capillary
- series
- parallel
- shock absorber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 66
- 230000035939 shock Effects 0.000 title claims abstract description 64
- 238000004364 calculation method Methods 0.000 title claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 20
- 230000001276 controlling effect Effects 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 42
- 238000009966 trimming Methods 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/398—Design verification or optimisation, e.g. using design rule check [DRC], layout versus schematics [LVS] or finite element methods [FEM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Fluid-Damping Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses a pressure loss calculation method of a series-parallel R type automobile shock absorber. On a pipeline between the oil conveying ports of the upper oil bin and the lower oil bin, a capillary series resistance regulating section and a capillary parallel frequency regulating section are sequentially connected from top to bottom. The capillary tube series resistance regulating section comprises four capillary tubes which are sequentially connected in series, and each capillary tube is connected with an electromagnetic valve in parallel to control the capillary tubes to work. The capillary parallel type frequency modulation section comprises four capillaries which are sequentially connected in parallel; each capillary is connected in series with an electromagnetic valve to control the work of the capillary. The diameter of the minimum capillary tube of the frequency modulation section is more than one time larger than that of the maximum capillary tube of the resistance modulation section. The invention provides a method for calculating the pressure loss of an R-type automobile shock absorber, and the purpose of reducing the uncertainty of a control model is achieved. Provides theoretical basis for improving the control quality of the shock absorber.
Description
Technical Field
The invention relates to the field of hydraulic automobile shock absorbers, in particular to a pressure loss calculation method of a series-parallel R type automobile shock absorber.
Background
The vibration damping systems of automobiles mainly include hydraulic, pneumatic, and electromagnetic systems. Hydraulic is currently the most widely used mode of vibration damping for automobiles.
Fig. 1 is a schematic structural diagram of a conventional series-parallel R-type vehicle shock absorber, which is referred to as a matrix series-parallel capillary variable system natural frequency shock absorber with patent number ZL 201621442498.8.
The automobile shock absorber comprises a frame, a spring, an axle, a hydraulic cylinder, an upper oil bin, a piston, a lower oil bin, a resistance adjusting section and a frequency adjusting section.
The resistance regulating section consists of 4 paths of capillary tubes and electromagnetic valves which are connected in series. The 4 capillaries were all coiled in an M-shape. The 4 capillaries are capillaries R8, R4, R2, R1; they are respectively connected in parallel with an electromagnetic valve V R8 、V R4 、 V R2 、V R1 . Regulating electromagnetic valve V R8 、V R4 、V R2 、V R1 Configuration S of Rn The damping can be adjusted.
The frequency modulation band consists of 4 paths of capillary tubes and electromagnetic valves which are connected in parallel. The 4 capillary tubes were all coiled in an M-shape. The 4 capillary tubes are respectively capillary tubes m8, m4, m2 and m1; they are respectively connected in series with an electromagnetic valve V m8 、V m4 、 V m2 、V m1 . Diameter d of the smallest capillary in the tuning range mmin Larger than the maximum capillary diameter d of the resistance-regulating section Rmax More than one time. Regulating electromagnetic valve V m8 、V m4 、V m2 、V m1 Configuration S of mn I.e. the system natural frequency can be adjusted.
The working principle of the automobile shock absorber is that when relative motion is generated between a frame and an axle, a piston can correspondingly generate or move up or down, and at the moment, oily liquid in a hydraulic cylinder can pass through a resistance adjusting section and a frequency adjusting section between an upper oil bin oil port and a lower oil bin oil port; and then flows from the upper oil bin to the lower oil bin, or flows from the lower oil bin to the upper oil bin.
Due to the viscosity effect of the oily liquid in the cylinder body, when the oily liquid flows through the resistance adjusting section, the capillary working in the resistance adjusting section generates resistance to the flowing of the oily liquid, so that the resistance to the movement of the piston is formed; the resistance is controlled by a capillary control system through configuration S of the electromagnetic valve Rn And controlling to further realize the resistance trimming of the resistance trimming section.
When the oily liquid flows through the frequency modulation section, the configuration S of the electromagnetic valve of the frequency modulation section is changed through the capillary control system mn The synthetic quality of the oily liquid which the vibration absorber participates in the oscillation can be adjusted, and the frequency modulation of the frequency modulation band is further realized.
When the resistance of the shock absorber is controlled, the control model of the control system has certain uncertainty because there is no good method for calculating the pressure loss of the shock absorber. One problem facing the shock absorber industry is how to reduce the uncertainty of the control model.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pressure loss calculation method of a series-parallel R type automobile shock absorber, so as to achieve the purpose of reducing the uncertainty of a control model.
The invention is realized by the following technical scheme:
a pressure loss calculation method of a series-parallel R type automobile shock absorber comprises the steps that the automobile shock absorber comprises a frame 11, an axle 17 and a hydraulic cylinder 13; a spring 12 is arranged between the frame 11 and the axle 17;
the upper end of the hydraulic cylinder 13 is connected with the frame 11 through a piston rod of the hydraulic cylinder, and the lower end cylinder body of the hydraulic cylinder 13 is connected with an axle 17; a piston 15 in the hydraulic cylinder 13 divides the hydraulic cylinder 13 into an upper oil bin 14 and a lower oil bin 16;
a resistance adjusting section and a frequency adjusting section are sequentially connected to a pipeline between the oil delivery ports of the upper oil bin 14 and the lower oil bin 16 from top to bottom; that is, the F oil port of the resistance adjusting section is connected to the a oil port of the upper oil bin 14, the E oil port of the resistance adjusting section is connected to the G oil port of the frequency adjusting band, and the H oil port of the frequency adjusting band is connected to the B oil port of the lower oil bin 16;
the pressure loss calculation method of the automobile shock absorber comprises the following steps:
(1) Determining the value ranges of i and j;
(2) Calculating the flow resistance R of the working capillary tubes of all resistance adjusting sections fRi :
(3) Calculating total flow resistance R of series working resistance regulating section fRt ：
R fRt ＝∑ i R fRi ；
(4) Calculating the flow resistance R of the working capillary tubes of all frequency modulation bands fmj :
(5) Calculating total flow resistance R of parallel working frequency modulation band fmt ：
(6) Calculating the total pressure loss of the automobile shock absorber:
∑Δp＝(R fRt +R fmt )·q t 。
the resistance adjusting section comprises four capillaries connected in series.
And the capillary tube of the resistance adjusting section is connected with an electromagnetic valve in parallel.
And the two port ends of the resistance adjusting section are respectively an oil port E and an oil port F.
The frequency modulation section comprises four parallel capillaries.
The frequency-adjusting capillary is connected in series with an electromagnetic valve.
And the two interface ends of the frequency modulation section are respectively a G oil port and an H oil port.
Diameter d of the smallest capillary of the frequency modulation band mmin Diameter d of the largest capillary of the specific resistance-regulating section Rmax More than one time larger.
The resistance-adjusting section and the capillary tube in the frequency-adjusting section are coiled into an M shape, an S shape or a spiral shape.
The electromagnetic valves in the resistance adjusting section and the frequency adjusting section are also connected with a capillary control system; the capillary control system is used for controlling the on-off of each electromagnetic valve.
The following description of the operating principle of the vehicle shock absorber is as follows:
as shown in fig. 1.
The resistance adjusting section of the automobile shock absorber comprises four capillary tubes of R8, R4, R2 and R1 respectively; they are respectively connected in parallel with an electromagnetic valve V R8 、V R4 、V R2 、V R1 Controlling the operation thereof.
The automobile shock absorber frequency modulation section comprises four capillary tubes, wherein the four capillary tubes are m8, m4, m2 and m1 respectively; they are respectively connected in series with an electromagnetic valve V m8 、V m4 、V m2 、V m1 Controlling the operation thereof.
The operation principle of the automobile shock absorber is that when relative motion is generated between a frame and an axle, a piston can correspondingly generate or move up or down, and at the moment, oily liquid in the hydraulic cylinder 13 can flow to the lower oil bin 16 from the upper oil bin 14 or flow to the upper oil bin 14 from the lower oil bin 16 through a resistance adjusting section and a frequency adjusting section between an oil port A and an oil port B.
Due to the viscosity effect of the oily liquid in the cylinder body, when the oily liquid flows through the resistance adjusting section, the working capillary tube in the resistance adjusting section can generate resistance to the flow of the oily liquid, so that the resistance to the movement of the piston is formed; the resistance is controlled by a capillary control system by changing the configuration S of the resistance adjusting section electromagnetic valve Rn And controlling to further realize the resistance trimming of the resistance trimming section.
When oily liquid flows throughWhen the frequency band is adjusted, the configuration S of the electromagnetic valve of the frequency band is changed through the capillary control system mn The synthetic quality of the oily liquid which the vibration absorber participates in oscillation can be adjusted, and the frequency modulation of the frequency modulation band is further realized.
Because the configuration S is determined Rn In the process, a pressure loss calculation method of the automobile shock absorber is used, so that the uncertainty of the shock absorber control model is reduced.
The pressure loss calculation method of the series-parallel R type automobile shock absorber of the invention is further explained as follows:
pressure loss calculation of single capillary
As shown in FIG. 2, the capillary tube is assumed to be a straight tube, length l, inner diameter d (d =2R, R: radius), horizontally placed; the tube is filled with a liquid having a kinetic viscosity mu, and the flow rate of the flowing liquid is q.
Taking a cylinder with its axis coincident with the axis of the tube, the radius of the cylinder being r, and the pressure of the liquid acting on the upstream end of the cylinder being P 1 The pressure of the liquid acting on the downstream end of the cylinder being P 2 . When the flow is stable, according to Newton's law of internal friction, the following equation of force balance is taken for the cylinder:
in the above formula, u is the velocity of the liquid. Because (P) 1 -P 2 ) I.e., the pressure loss Δ p of the capillary, and therefore can be obtained from the formula (1-1):
integration of equation (1-2) can result:
the formula (1-3) indicates that: when the liquid makes laminar motion in the straight pipe, the speed is symmetrical to the central line of the circular pipe and is distributed according to the parabolic rule.
Referring to FIG. 2, a micro-toroid area of thickness dr is taken at radius r, and the flow through the micro-toroid area dq is:
dq＝u·2πrdr (1-4)
integration of equations (1-4) can yield:
we define the flow resistance R of the capillary f Comprises the following steps:
flow resistance R f The unit of (A) is: pa s/m 3 。
The compound can be obtained by the formulas (1-5) and (1-6):
Δp＝R f ·q (1-7)
similar to ohm's law describing the current, voltage, resistance relationship, we can also write equations (1-7) as:
(II) calculating the pressure loss of the resistance adjusting section with a plurality of capillaries working in series
As shown in FIG. 1;
let i take the whole range of the working capillary labels in the resistance-adjusting section capillaries R1, R2, R4 and R8. For example, when all of the capillaries R1, R2, R4, and R8 are in operation, the value range of i is {1,2,4,8}; when only R1 and R8 in the capillaries R1, R2, R4 and R8 work, the value range of i is {1,8}; the rest can be analogized. The length and the diameter of a working capillary Ri of the resistance adjusting section are respectively set as l Ri And d Ri According to the formula (1-6), the flow resistance R of the capillary Ri fRi The calculation formula of (A) is as follows:
let the pressure loss at both ends of the working resistance-adjusting section be Δ p Rt Let the flow rate of the working resistance-adjusting section be q t Setting the total flow resistance of the working resistance-adjusting section as R fRt . According to the formula (1-8), there are:
here, the pressure loss Δ p across the active resistor trimming Rt The pressure loss at the two ends of the resistance regulating section can also be called as the pressure loss of the resistance regulating section; flow q of working resistance-adjusting section t Is also the flow of the resistance regulating section; and the total flow resistance R of the working resistance adjusting section fRt Only the total flow resistance of the capillary tube of the resistance regulating section participating in the work is needed, not necessarily the total flow resistance of the whole resistance regulating section.
When a plurality of capillaries in the resistance adjusting section are connected in series for working, the flow of each capillary is the same and is the flow q of the resistance adjusting section t . Neglecting the local pressure loss of the capillary, the pressure loss of each capillary is the product of its flow and its flow resistance. Total pressure loss of the capillary tube in series with the resistance-adjusting section (i.e. pressure loss Δ p across the working resistance-adjusting section) Rt ) The sum of the pressure losses of all the capillaries working in series in the resistance adjusting section is as follows:
Δp Rt ＝∑ i R fRi ·q t (2-3)
the formula (2-2) and the formula (2-3) can be used for obtaining:
R fRt ＝∑ i R fRi (2-4)
similar to the series resistance circuit relationship, equation (2-4) can also be expressed as: when the resistance-regulating section capillaries are connected in series for working, the total flow resistance R of the working resistance-regulating section fRt Equal to the sum of the flow resistances of the capillary tubes in the resistance adjusting sections participating in the work.
From the formula (2-2), the pressure loss of the resistance adjusting section is:
Δp Rt ＝R fRt ·q t (2-5)
(III) calculating the pressure loss of the frequency modulation band with a plurality of capillaries working in parallel
As shown in fig. 1;
let j take the whole range of the capillary labels working in the frequency-modulation section capillaries m1, m2, m4 and m 8. For example, when all of the capillaries m1, m2, m4, and m8 are in operation, the value range of j is {1,2,4,8}; when only m1 and m8 of the capillaries m1, m2, m4 and m8 work, the value range of j is {1,8}; the rest can be analogized. Respectively setting the length and the diameter of a working capillary mj of a frequency modulation section to be l mj And d mj According to the formula (1-6), the flow resistance R of the capillary mj fmj The calculation formula of (A) is as follows:
because the resistance adjusting section and the frequency adjusting section are in series work, the flow rates of the resistance adjusting section and the frequency adjusting section are the same; that is, the flow rate of the operating frequency modulation band is also q t . Let the pressure loss at both ends of the working frequency modulation band be Δ p mt Setting the total flow resistance of the working frequency modulation band as R fmt According to the formula (1-8), then:
here, the pressure loss Δ p across the operating tuning band mt The pressure loss at two ends of the frequency modulation section can also be called as the pressure loss of the frequency modulation section; flow q of working frequency modulation band t Also the traffic of the frequency modulation band; and the total flow resistance R of the working frequency modulation band fmt Only the total flow resistance of the tuned-band capillary, not necessarily the whole tuned band, is involved in the operation.
In the frequency modulation section, when a plurality of capillaries work in parallel, the pressure loss of each capillary is the same, and is the pressure loss delta p at two ends of the working frequency modulation section mt (ii) a Neglecting the local pressure loss of the capillary, the flow per working capillaryThe quotient of its pressure loss and its flow resistance; total flow q of parallel working frequency-adjusting band t Is the sum of the flows of the individual capillaries working in parallel. Namely:
comparing the formulas (3-2) and (3-3) gives:
similar to the parallel resistance circuit relationship, equation (3-4) can also be expressed as: when the frequency-modulation section capillary tubes work in parallel, the total flow resistance R of the working frequency-modulation section fmt Is equal to the sum of the inverses of the flow resistances of the capillaries participating in the working frequency-modulation section.
The total flow resistance R of the working frequency modulation band can be obtained by the formula (3-4) fmt Comprises the following steps:
from the formula (3-2), the pressure loss Δ p at both ends of the operating tuning band mt Comprises the following steps:
△p mt ＝R fmt ·q t (3-6)
(IV) calculating total pressure loss sigma delta p of the shock absorber
As shown in FIG. 1, neglecting the pressure loss of the connecting pipeline, the total pressure loss Sigma Delta p of the shock absorber is the sum of the pressure losses of the resistance adjusting section and the frequency adjusting section. According to the formulae (2-5) and (3-6):
∑Δp＝(R fRt +R fmt )·q t (4-1)
here, the total pressure loss Σ Δ p of the shock absorber is the pressure loss between the oil port of the upper oil bin a and the oil port of the lower oil bin B; the total pressure loss Σ Δ p of the damper is also referred to as an automobile damper total pressure loss.
(V) calculating method steps
Summarizing the parts (two), (three) and (four), the pressure loss calculation method of the automobile shock absorber comprises the following steps:
(1) Determining the value ranges of i and j;
(2) Calculating the flow resistance R of the working capillary tubes of all resistance adjusting sections fRi :
(3) Calculating total flow resistance R of series working resistance regulating section fRt ：
R fRt ＝∑ i R fRi ；
(4) Calculating the flow resistance R of the working capillary tubes in all the frequency modulation bands fmj :
(5) Calculating total flow resistance R of parallel working frequency modulation band fmt ：
(6) Calculating the total pressure loss of the automobile shock absorber:
∑Δp＝(R fRt +R fmt )·q t 。
compared with the prior art, the invention has the following advantages and effects:
the invention provides a method for calculating the pressure loss of an R-type automobile shock absorber, and the purpose of reducing the uncertainty of a control model is achieved. Provides theoretical basis for improving the control quality of the shock absorber.
The invention has great use for improving the design level of the R type automobile shock absorber and reducing the test cost; has positive and outstanding beneficial effects on the development of the modern automobile vibration reduction technology.
Drawings
Fig. 1 is a structural schematic diagram of a conventional series-parallel R-type automobile shock absorber.
Fig. 2 is a diagram illustrating calculation of a single capillary pressure loss Δ p in the pressure loss calculation method of the series-parallel R-type automobile shock absorber according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples
As shown in FIG. 1;
the series resistance-adjusting section comprises four capillary tubes of R8, R4, R2 and R1 respectively; they are respectively connected in parallel with an electromagnetic valve V R8 、V R4 、V R2 、V R1 Controlling the operation thereof. The length of the capillary tube R1 is L R1 (ii) a The ratio of the lengths of the capillaries R8, R4, R2, R1 is 8; all of them have a diameter d R 。
The parallel frequency modulation section comprises four capillary tubes which are m8, m4, m2 and m1 respectively; they have equal cross-sectional areas and are respectively connected in series with electromagnetic valves V m8 、V m4 、V m2 、V m1 Controlling the operation thereof. The ratio of the lengths of the capillaries m8, m4, m2, m1 is 8; the length L of the shortest capillary m1 of the four capillaries m1 Equal to the length L of the resistance-adjusting section capillary tube R1 R1 8 times of the total weight of the composition; diameter d of the four capillaries m Equal to 4 times the diameter d of the resistance-regulating section capillary R 。
The dynamic viscosity mu of the oil liquid of the shock absorber and the flow q of the resistance adjusting section of the shock absorber are known t 。
According to the conditions of this embodiment, we can first find the dimension parameters of all the capillaries in the resistance-tuning section and the frequency-tuning section. Then, the total pressure loss Σ Δ p of the shock absorber under various operating conditions can be calculated according to the following steps:
(1) Determining the value ranges of i and j;
(2) Calculating the flow resistance R of the working capillary tubes of all resistance adjusting sections fRi :
(3) MeterCalculating total flow resistance R of series working resistance-adjusting section fRt ：
R fRt ＝∑ i R fRi ；
(4) Calculating the flow resistance R of the working capillary tubes in all the frequency modulation bands fmj :
(5) Calculating total flow resistance R of parallel working frequency modulation band fmt ：
(6) Calculating the total pressure loss of the automobile shock absorber:
∑Δp＝(R fRt +R fmt )·q t 。
therefore, the capillary control system uses the pressure loss calculation method of the automobile shock absorber, so that the uncertainty of the control model can be reduced, and the control quality of the shock absorber is improved.
In the present embodiment, since the pressure loss calculation method of the analytic expression is implemented, it is possible to easily calculate various operating conditions (value ranges of various i and j). Thereby providing a theoretical basis for reducing the uncertainty of the control model.
The present embodiment will now be further described by the following four points.
1. Electromagnetic valve for regulating connection sequence of resistance section and frequency band and controlling capillary tube work
The connecting sequence of the resistance adjusting section and the frequency adjusting section can be connected according to other sequences besides the sequence shown in fig. 1. In fig. 1, each capillary tube has a solenoid valve to control its operation, and for the capillary tube which always keeps working, the solenoid valve may not be provided; that is, the number of capillaries and the number of solenoid valves are not necessarily exactly equal.
2. Name of series-parallel R type automobile shock absorber
In the name of the series-parallel R type automobile shock absorber, the first series in the series-parallel connection indicates that the resistance adjusting section is adjusted by a series capillary, and the second parallel indicates that the frequency adjusting section is adjusted by a parallel capillary. The meaning of the expression of the R formula is as follows:
in the Resistance adjusting section of the capillary tube, the capillary tubes R8, R4, R2 and R1 and corresponding electromagnetic valves thereof are used for adjusting the Resistance (Resistance) of the shock absorber under the control of a control system. The method is characterized in that: outside a hydraulic cylinder body, according to the Resistance (Resistance) characteristic of a capillary tube, arranging multiple paths (four paths or non-four paths) of capillary tubes which are connected in series (or in parallel) according to specific parameters (such as area, length, flow Resistance, inverse of the flow Resistance, flow Resistance of hydraulic oil under a certain working condition and the like) according to a certain rule (such as binary coding rule of 8421 equal ratio, or other equal ratio or unequal ratio rules), and controlling electromagnetic valves of the corresponding capillary tubes through a control system so as to achieve the purpose of adjusting the Resistance. These are the meanings of "R formula" in the varistor stage.
In the frequency modulation section, because the structure and the mode of adjusting the frequency by using the capillary tube have many similarities with the structure and the mode of adjusting the damping by using the capillary tube, the mode of adjusting the natural frequency of the shock absorber system by using the capillary tube and the electromagnetic valve is also called as an "R type". In the frequency modulation band, the meaning of "R formula" is specifically explained as follows:
and in the frequency modulation section of the capillary, the natural frequency of the shock absorber system is adjusted by using the capillaries m8, m4, m2 and m1 and corresponding electromagnetic valves under the control of a control system. The method is characterized in that: in addition to the hydraulic cylinder body, by utilizing the characteristic that Resistance (Resistance) of the capillary tube is small when the diameter of the capillary tube is large, the multiple paths (four paths or non-four paths) of the capillary tubes which are connected in parallel (or in series) are arranged according to certain parameters (such as area, length or volume) according to certain rules (such as binary coding rules of ratios of 8421 and the like, or other equal-ratio or unequal-ratio rules), and the electromagnetic valves of the corresponding capillary tubes are controlled by a control system, so that the adjustment of the synthetic quality of the hydraulic oil participating in oscillation is realized, and the aim of adjusting the natural frequency of the shock absorber system is fulfilled.
When the damper has any one of the two meanings of "R", it is referred to as an R-type damper or an R-type automobile damper. In the R-type shock absorber, when there is both a capillary resistance-tuning section and a capillary frequency-tuning section, the number of paths of the capillary in the resistance-tuning section and the frequency-tuning section may be equal or different.
In the R-type shock absorber, the capillary tube does not need to be thin, and the thin capillary tube means resistance generated when hydraulic oil flows through the capillary tube; that is, the capillary tube is an oil pipe or an oil path which generates resistance when hydraulic oil flows.
The capillary tube of the R-type damper may be formed in a spiral shape, an "S" shape, or other shapes in addition to the "M" shape. The shapes are only specifically listed, and many shapes can be listed in practical application and can be flexibly determined according to specific requirements. The materials for manufacturing the capillary oil passages can be steel, copper, various alloys, non-metallic materials and the like; the method for manufacturing the capillary oil passage may be a method of machining a molded pipe, a method of machining, a method of 3D printing, or the like.
3. Description of the use of the formula
For Newtonian fluid in a stable flow and laminar flow state, the capillary is assumed to be a horizontally placed straight pipe, and the above calculation formula is derived in the invention under the condition of neglecting the local pressure loss of the capillary and the pressure loss of a connecting pipeline. If the actual operating condition is greatly different from the above conditions and assumptions, the formula has an error. Compared with the prior art without the formulas, the calculation method can reduce the uncertainty of the control model for the system identification of the control system even if the formulas have errors, and provides a theoretical basis for improving the control quality of the shock absorber. Of course, according to the calculation method of the invention, some tests are added, and the calculation method can be corrected; thereby further improving the damper control quality.
4. Spring for automobile shock absorber
The spring in the damper of the present invention may be a gas spring, a hydro-pneumatic spring, or other springs, in addition to a coil spring.
As described above, the present invention can be preferably realized.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (10)
1. A pressure loss calculation method of a series-parallel R type automobile shock absorber comprises the steps that the automobile shock absorber comprises a frame (11), an axle (17) and a hydraulic cylinder (13); a spring (12) is arranged between the frame (11) and the axle (17);
the upper end of the hydraulic cylinder (13) is connected with the frame (11) through a piston rod of the hydraulic cylinder, and the lower end cylinder body of the hydraulic cylinder (13) is connected with the axle (17); a piston (15) in the hydraulic cylinder (13) divides the hydraulic cylinder (13) into an upper oil bin (14) and a lower oil bin (16);
a resistance adjusting section and a frequency adjusting section are sequentially connected to a pipeline between the oil delivery ports of the upper oil bin (14) and the lower oil bin (16) from top to bottom; namely, an oil port F of the resistance adjusting section is connected with an oil port A of the upper oil bin (14), an oil port E of the resistance adjusting section is connected with an oil port G of the frequency adjusting section, and an oil port H of the frequency adjusting section is connected with an oil port B of the lower oil bin (16);
the method is characterized by comprising the following steps:
(1) Determining the value ranges of i and j;
(2) Calculating the flow resistance R of the working capillary tubes of all resistance adjusting sections fRi :
(3) Calculating total flow resistance R of series working resistance adjusting section fRt ：
R fRt ＝∑ i R fRi ；
(4) Calculating the flow resistance R of the working capillary tubes in all the frequency modulation bands fmj :
(5) Calculating total flow resistance R of parallel working frequency modulation band fmt ：
(6) Calculating the total pressure loss of the automobile shock absorber:
∑Δp＝(R fRt +R fmt )·q t ；
wherein,
i is the number of capillary tubes in the resistance adjusting section which participate in the work;
j is the mark number of the capillary tube in the frequency modulation section which participates in the work;
μ is the dynamic viscosity of the liquid;
l Ri the length of the working capillary tube of the resistance adjusting section;
d Ri the diameter of the working capillary tube of the resistance adjusting section;
l mj the length of the working capillary tube in the frequency modulation section;
d mj the diameter of the working capillary tube in the frequency modulation section;
q t the flow of the resistance regulating section is regulated.
2. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 1, characterized in that: the resistance adjusting section comprises four capillaries connected in series.
3. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 2, characterized in that: and the capillary tube of the resistance adjusting section is connected with an electromagnetic valve in parallel.
4. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 3, characterized in that: and the two port ends of the resistance adjusting section are respectively an oil port E and an oil port F.
5. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 1, characterized in that: the frequency modulation section comprises four capillaries connected in parallel.
6. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 5, characterized in that: the frequency-adjusting capillary is connected in series with an electromagnetic valve.
7. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 6, characterized in that: and the two interface ends of the frequency modulation section are respectively a G oil port and an H oil port.
8. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 7, characterized in that: diameter d of the smallest capillary of the frequency modulation band mmin Diameter d of the largest capillary of the specific resistance regulating section Rmax More than one time larger.
9. The pressure loss calculation method for the series-parallel R-type automobile shock absorber according to any one of claims 1 to 8, characterized in that: the resistance-adjusting section and the capillary tube in the frequency-adjusting section are coiled into an M shape, an S shape or a spiral shape.
10. The pressure loss calculation method of the series-parallel R-type automobile shock absorber according to claim 9, characterized in that: the electromagnetic valves in the resistance adjusting section and the frequency adjusting section are also connected with a capillary control system; and the capillary control system is used for controlling the on-off of each electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810998310.5A CN109033708B (en) | 2018-08-29 | 2018-08-29 | Pressure loss calculation method for series-parallel R type automobile shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810998310.5A CN109033708B (en) | 2018-08-29 | 2018-08-29 | Pressure loss calculation method for series-parallel R type automobile shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109033708A CN109033708A (en) | 2018-12-18 |
| CN109033708B true CN109033708B (en) | 2022-12-16 |
Family
ID=64626063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810998310.5A Active CN109033708B (en) | 2018-08-29 | 2018-08-29 | Pressure loss calculation method for series-parallel R type automobile shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109033708B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016908A (en) * | 1989-03-13 | 1991-05-21 | Monroe Auto Equipment Company | Method and apparatus for controlling shock absorbers |
| JP2000238637A (en) * | 1999-02-23 | 2000-09-05 | Kayaba Ind Co Ltd | Rocking vibration control damper of railway rolling stock and vibration control method |
| CN103678832A (en) * | 2014-01-02 | 2014-03-26 | 山东理工大学 | Method for calculating composite stress of non-equal structure superposed valve plates of vehicle shock absorber |
| CN106678250A (en) * | 2016-12-27 | 2017-05-17 | 华南理工大学 | Parallel-serial capillary tube varying system inherent frequency vehicle shock absorber running method |
| CN207278765U (en) * | 2017-08-30 | 2018-04-27 | 扬州天健机械制造有限公司 | A kind of square hole type bottom valve for automobile absorber |
| DE102016221980A1 (en) * | 2016-11-09 | 2018-05-09 | Zf Friedrichshafen Ag | Damper device for a vehicle and vehicle with the damper device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4909570B2 (en) * | 2005-11-08 | 2012-04-04 | カヤバ工業株式会社 | Single cylinder type hydraulic shock absorber |
-
2018
- 2018-08-29 CN CN201810998310.5A patent/CN109033708B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016908A (en) * | 1989-03-13 | 1991-05-21 | Monroe Auto Equipment Company | Method and apparatus for controlling shock absorbers |
| JP2000238637A (en) * | 1999-02-23 | 2000-09-05 | Kayaba Ind Co Ltd | Rocking vibration control damper of railway rolling stock and vibration control method |
| CN103678832A (en) * | 2014-01-02 | 2014-03-26 | 山东理工大学 | Method for calculating composite stress of non-equal structure superposed valve plates of vehicle shock absorber |
| DE102016221980A1 (en) * | 2016-11-09 | 2018-05-09 | Zf Friedrichshafen Ag | Damper device for a vehicle and vehicle with the damper device |
| CN106678250A (en) * | 2016-12-27 | 2017-05-17 | 华南理工大学 | Parallel-serial capillary tube varying system inherent frequency vehicle shock absorber running method |
| CN207278765U (en) * | 2017-08-30 | 2018-04-27 | 扬州天健机械制造有限公司 | A kind of square hole type bottom valve for automobile absorber |
Non-Patent Citations (1)
| Title |
|---|
| "汽车减震器弹簧盘疲劳仿真分析";陈芳芳等;《机械工程与自动化》;20130415;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109033708A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9879748B2 (en) | Two position valve with face seal and pressure relief port | |
| CN109101748B (en) | Pressure loss calculation method for parallel R-type automobile shock absorber | |
| JPH10110766A (en) | Damping force regulation type hydraulic shock absorber | |
| CN106678250B (en) | A kind of and capillary variable system intrinsic frequency vehicle shock absorber operation method of connecting | |
| CN110107763A (en) | A kind of multistage orifice plate damping coil type guide rail stable-pressure device and its method | |
| CN106763451B (en) | A kind of damper of matrix and parallel capillary tube variable system intrinsic frequency | |
| CN102518732B (en) | Automobile damper with variable damp of capillary tubes in serial connection | |
| CN1890485A (en) | Solenoid actuated continuously variable servo valve for adjusting damping in shock absorbers and struts | |
| CN106678252B (en) | A kind of series-parallel capillary variable system intrinsic frequency vehicle shock absorber operation method | |
| CN109299518B (en) | Pressure loss calculation method for series R-type automobile shock absorber | |
| CN100414135C (en) | Shock absorber with variable damping characteristics | |
| CN109033708B (en) | Pressure loss calculation method for series-parallel R type automobile shock absorber | |
| CN109190240B (en) | Pressure loss calculation method for parallel-series R-type automobile shock absorber | |
| CN106763437B (en) | A kind of and parallel capillary tube variable system intrinsic frequency vehicle shock absorber operation method | |
| CN208778560U (en) | A kind of adjustable gas spring of rigidity | |
| US20220128117A1 (en) | Shock absorber | |
| CN106763450B (en) | A kind of damper of matrix and capillary variable system intrinsic frequency of connecting | |
| CN106678253B (en) | A kind of damper of matrix string series connection capillary variable system intrinsic frequency | |
| CN208010840U (en) | R formulas vehicle shock absorber that a kind of single turbine recovers energy and in parallel | |
| CN106763440B (en) | A kind of damper of the series-parallel capillary variable system intrinsic frequency of matrix | |
| CN109083969A (en) | A kind of Calculation of pressure loss method of string series connection R formula vehicle shock absorber | |
| CN207921213U (en) | R formulas vehicle shock absorber that a kind of turbine recovers energy and in parallel | |
| CN108180246B (en) | Parallel R-type automobile shock absorber capable of recovering energy by turbine and method | |
| CN206419417U (en) | A kind of shock absorber of matrix and capillary variable system intrinsic frequency of connecting | |
| JPH023065B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |