CN113701623B - Ship propulsion shafting elastic support centering on-line monitoring system and method - Google Patents
Ship propulsion shafting elastic support centering on-line monitoring system and method Download PDFInfo
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Abstract
The invention relates to the technical field of elastic support of ship propulsion shafting, in particular to a centering on-line monitoring system and method of the elastic support of the ship propulsion shafting, comprising four displacement sensors which are respectively positioned at four corners of an upper pressing plate of the elastic support and used for measuring displacement changes between the upper pressing plate and a lower pressing plate; the three acceleration sensors are positioned in the vertical, transverse and axial directions of the elastic support and are used for measuring the transverse, axial and vertical vibration acceleration of the support bearing; the rotating speed sensor is positioned at the rotating shaft of the high-elasticity coupler and is used for measuring the rotating speed of the shafting; the data acquisition controller processes the measured values of the displacement sensor, the acceleration sensor and the rotating speed sensor to obtain a centering offset value and a bending value of the elastic support relative to the main machine high-elasticity coupler and a vibration intensity value of the elastic support, and sets a centering gesture dynamic threshold under different rotating speed working conditions according to the dynamic relation between the centering offset value and the bending value and the vibration intensity value of the elastic support, so that on-line monitoring and early warning of the centering gesture of the elastic support of the ship propulsion shafting are realized.
Description
Technical Field
The disclosure relates to the technical field of centering monitoring of ship propulsion shafting, in particular to an elastic support centering on-line monitoring system and method of a ship propulsion shafting.
Background
The elastic support of the ship propulsion shafting is a support bearing with vibration reduction, is an important component of a power output transmission mechanism moving part of a ship propulsion diesel engine, is arranged between a diesel engine high-elasticity coupling and a universal coupling, mainly plays a role of supporting the high-elasticity coupling and the universal coupling, and simultaneously transmits the power of the diesel engine.
The problem of severe vibration of the elastic support of the ship propulsion shafting is common, and one of the important reasons for the severe vibration is misalignment of the main propulsion diesel engine and the middle and short shafts of the elastic support. At present, a ship propulsion shafting generally adopts a dial indicator to measure the offset and the tortuosity value of a short shaft in an elastic support and a propulsion diesel engine to perform static centering, and a static centering attitude threshold value is set. The test method is complex, a special tool is required to be used for carrying out static measurement for many times, the method can only measure the centering gesture in a static state, the centering gesture of a short shaft and a main machine in the elastic support of a ship propulsion shafting cannot be dynamically monitored on line, a dynamic centering gesture threshold cannot be set, and dynamic centering gesture early warning is carried out.
Therefore, a real-time centering on-line monitoring system is urgently needed in engineering, and can monitor the centering postures of the elastic supports and the main machine and the vibration intensity of the elastic supports in real time, and establish the dynamic relation between the centering postures and the vibration intensity, so that a reasonable dynamic centering posture threshold value is set according to the vibration intensity threshold value of the elastic supports, on-line monitoring and early warning of the centering postures of the elastic supports of the ship propulsion shafting are realized, early fault hidden dangers caused by centering abnormality can be found in time, and assistance is provided for equipment management and maintenance.
Disclosure of Invention
Aiming at the defects of the prior technical scheme, the invention aims to provide a ship propulsion shafting elastic support centering on-line monitoring system and a method thereof, which realize the purposes of on-line monitoring and early warning of the ship propulsion shafting elastic support centering posture.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
In a first aspect, the invention discloses a centering on-line monitoring system for a ship propulsion shafting elastic support, which comprises displacement sensors arranged at four corners of a lower pressing plate of the propulsion shafting elastic support, acceleration sensors arranged along the vertical, transverse and axial directions of the elastic support, a rotating speed sensor arranged at a rotating shaft of a high-elasticity coupling and a data acquisition controller arranged beside the elastic support, wherein the displacement sensors, the acceleration sensors and the rotating speed sensor are electrically connected with the data acquisition controller.
According to a further technical scheme, the 4 displacement sensors are fixed on the elastic support lower pressing plate through the L-shaped support, and are preset with an air gap from the upper pressing plate and used for measuring displacement changes between the elastic support upper pressing plate and the lower pressing plate.
According to the further technical scheme, the 3 acceleration sensors are fixedly arranged in the vertical direction, the transverse direction and the axial direction of the elastic support respectively through bolts or adhesives and used for measuring the vertical direction, the transverse direction and the axial vibration acceleration of the elastic support, and further calculating the vibration intensity of the elastic support.
According to the further technical scheme, 1 rotation speed sensor is arranged at the rotating shaft of the high-elasticity coupler through a bracket, and rotation speed pulses are received through a reflecting sheet adhered to the rotating shaft, so that the rotation speed of a shafting is calculated.
The data acquisition controller comprises an external interface, data acquisition and analysis hardware, a touch control screen, a basic software module, a centering gesture calculation module and a monitoring diagnosis module, and is used for acquiring and analyzing sensor signals, calculating the centering gesture of the elastic support relative to the host and the vibration intensity of the elastic support through a certain calculation method, and displaying and early warning on the touch control screen.
In a second aspect, the present disclosure further relates to a method for on-line monitoring of elastic support centering of a ship propulsion shafting, based on the on-line monitoring system for elastic support centering of a ship propulsion shafting, which comprises the following specific steps:
Step 1, uploading displacement variation between an upper pressing plate and a lower pressing plate of an elastic support acquired by a displacement sensor, shafting rotating speed pulses acquired by a rotating speed sensor and vertical, transverse and axial vibration acceleration of the elastic support acquired by an acceleration sensor to a basic software module of a data acquisition device for pretreatment;
Step 2, the basic software module preprocesses the data acquired by the displacement sensor and then uploads the data to the centering gesture calculation module, and the centering gesture calculation module calculates vertical translation, transverse winding and axial winding of the elastic support according to a certain calculation method and analyzes and obtains a centering offset value and a bending value of the elastic support relative to the high-elasticity coupling of the host;
Step 3, the basic software module preprocesses the rotating speed pulse acquired by the rotating speed sensor and then uploads the rotating speed pulse to the monitoring and diagnosis module, and a rotating speed signal is obtained through the monitoring and diagnosis module;
Step 4, the basic software module preprocesses the data acquired by the acceleration sensor and then uploads the data to the monitoring and diagnosis module, and the vibration intensity of the elastic support under the working conditions of different rotating speeds is obtained through calculation of the monitoring and diagnosis module;
And 5, recording the centering attitude value of the elastic support relative to the main machine high-elasticity coupler and the vibration intensity data of the elastic support under different rotating speed working conditions in real time by the monitoring and diagnosis module, establishing mathematical connection between the centering attitude value and the vibration intensity data, and setting the dynamic centering attitude threshold of the elastic support relative to the main machine high-elasticity coupler under different rotating speed working conditions according to the vibration intensity threshold specified by the relevant standard.
According to the further technical scheme, the method further comprises the step 6 of judging a diagnosis result by the monitoring diagnosis module according to the centering gesture threshold value, outputting the diagnosis result to a touch display screen of the data acquisition controller, and displaying an alarm by the touch control screen when the centering gesture is abnormal, and prompting a worker to carry out fault maintenance.
In a further technical scheme, in the step2, a calculation formula of the centering offset value delta and the tortuosity value epsilon is as follows:
Wherein d is the vertical translation amount of the elastic support upper pressing plate, alpha is the transverse disturbance amount of the elastic support upper pressing plate, gamma is the axial disturbance amount of the elastic support upper pressing plate, and beta and theta are intermediate variables; l 1 is the horizontal distance between the No. 1 displacement sensor and the No. 2 displacement sensor, L 2 is the horizontal distance between the No. 2 displacement sensor and the No. 4 displacement sensor, L 3 is the horizontal distance between the upper top point of the elastic support close to the high-elastic flange end and the central point of the upper pressing plate, L 4 is the diameter of the flange end surface, and L 5 is the vertical distance between the upper top point of the elastic support close to the high-elastic flange end and the plane of the upper pressing plate.
According to a further technical scheme, the relation between each variable and the elastic support structure dimension L 1、L2、L3、L4、L5 and the real-time value y 1、y2、y3、y4 acquired by the displacement sensor is as follows:
α＝(y1-y3)/L1＝(y2-y4)/L1
γ＝(y3-y4)/L2＝(y1-y2)/L2
θ＝arctan(L3/L5)
β＝arctan(L3/(L5-L4))
d＝(y1+y2+y3+y4)/4。
The beneficial effects of the above technical scheme are:
the centering posture of the elastic support of the ship propulsion shafting can be monitored on line only by 4 displacement sensors and a certain calculation method, and the centering state threshold value of the elastic support under different rotating speed working conditions can be determined by combining 3 acceleration sensors and 1 rotating speed sensor, so that the on-line monitoring and early warning of the centering posture of the elastic support of the ship propulsion shafting are realized.
The system has the advantages of simple structure, convenient sensor installation and high measurement precision, can realize long-time online measurement, overcomes the defect that a laser centering instrument, a dial indicator and the like cannot realize online monitoring and early warning, and fills the blank of the online monitoring technology of the elastic supporting centering posture of the ship propulsion shafting.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top view of a sensor station layout of the present invention
FIG. 3 is a front view of a sensor station arrangement of the present invention;
FIG. 4 is a state diagram of vertical translation of the upper platen;
FIG. 5 is a state diagram of the upper platen laterally rotated;
FIG. 6 is a state diagram of the upper platen axially rotated;
FIG. 7 is a schematic diagram of a front view of a data acquisition controller according to the present invention;
FIG. 8 is a schematic diagram of the left side of the data acquisition controller of the present invention;
FIG. 9 is a right side schematic view of the data acquisition controller structure of the present invention;
In the figure, 1, a displacement sensor, 1-1, a first vertical eddy current displacement sensor, 1-2, a second vertical eddy current displacement sensor, 1-3, a third vertical eddy current displacement sensor, 1-4 and a fourth vertical eddy current displacement sensor; 2. acceleration sensor 2-1, first acceleration sensor 2-2, second acceleration sensor 2-3, third acceleration sensor; 3. the device comprises a rotating speed sensor, 4, a data acquisition controller, 4-1, a first analog input channel slot, 4-2, a second analog input channel slot, 4-3, a first rotating speed/counter channel, 4-4, a second rotating speed/counter channel, 4-5, a USB interface, 4-6, a power switch, 4-7, a charging port/external power interface, 4-8, an Ethernet interface, 4-9, a touch control screen, 5, a software module, 5-1, a basic software module, 5-2, a centering gesture calculation module, 5-3, a monitoring diagnosis module, 6, an L-shaped bracket, 7, an elastic shock absorber, 8, an upper pressure plate, 9, a lower pressure plate, 10, an elastic support, 11, a shaft, 12, a power supply, 13 and a high-elasticity coupling.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
The invention discloses a ship propulsion shafting elastic support centering on-line monitoring system, referring to fig. 1-9, a first vertical eddy current displacement sensor 1-1, a second vertical eddy current displacement sensor 1-2, a third vertical eddy current displacement sensor 1-3 and a fourth vertical eddy current displacement sensor 1-4 are arranged at four corners of a propulsion shafting elastic support pressing plate 9, 3 acceleration sensors are respectively arranged in the vertical, transverse and axial directions of an elastic support 10, namely a first acceleration sensor 2-1, a second acceleration sensor 2-2 and a third acceleration sensor 2-3, 1 rotation speed sensor 3 is arranged at a high-elasticity coupler rotating shaft 11, 1 set of data acquisition controller 4 is arranged beside the elastic support 10, and all the sensors are electrically connected with the data acquisition controller.
Referring to fig. 1-3, L-shaped brackets 6 are arranged at four corners of an elastic support lower pressure plate 9, a first vertical eddy current displacement sensor 1-1, a second vertical eddy current displacement sensor 1-2, a third vertical eddy current displacement sensor 1-3 and a fourth vertical eddy current displacement sensor 1-4 are respectively and fixedly arranged at the top ends of the L-shaped brackets 6, a certain initial air gap is kept between the 4 vertical eddy current displacement sensor probes and an upper pressure plate 8, and displacement changes between the upper pressure plate and the lower pressure plate can cause the centering gesture of the elastic support 10 and a main machine high-elasticity coupling 13 to change due to displacement changes between the upper pressure plate and the lower pressure plate, so the displacement changes between the upper pressure plate and the lower pressure plate are measured through the 4 vertical eddy current displacement sensors.
Referring to fig. 1 to 3, the first acceleration sensor 2-1, the second acceleration sensor 2-2, and the third acceleration sensor 2-3 are fixedly installed in the vertical, lateral, and axial directions of the elastic support 10 by bolts or adhesives, respectively, for measuring the vertical, lateral, and axial vibration accelerations of the elastic support 10, and the vibration intensity is calculated by the data acquisition controller 4.
Referring to fig. 1 to 3, the rotation speed sensor 3 is a non-contact photoelectric rotation speed sensor, is installed near the high elastic coupling 13, measures rotation speed pulses by a reflection sheet attached to the rotation shaft 11, and calculates rotation speed by the data acquisition controller 4.
Referring to fig. 7 to 9, the data acquisition controller 4 includes a first analog input channel slot 4-1, a second analog input channel slot 4-2, a first rotational speed/counter channel 4-3, a second rotational speed/counter channel 4-4, a USB interface 4-5, a power switch 4-6, a charging port/external power interface 4-7, an ethernet interface 4-8, and a touch control screen 4-9; the first analog input channel slot 4-1 and the second analog input channel slot 4-2 are analog input channel slots on the left side of the data acquisition controller, each slot is provided with 4 channels, 8 channels are provided with ICP/IEPE, AC, DC access capability, meanwhile, the power supply function of the eddy current sensor is built in, the first vertical eddy current displacement sensor 1-1, the second vertical eddy current displacement sensor 1-2, the third vertical eddy current displacement sensor 1-3, the fourth vertical eddy current displacement sensor 1-4, the first acceleration sensor 2-1, the second acceleration sensor 2-2 and the third acceleration sensor 2-3 are respectively connected into 7 channels, and the other 1 channel is a backup.
The rotation speed sensor 3 is connected to 1 channel of the first rotation speed/counter channel 4-3 or the second rotation speed/counter channel 4-4, and the other 1 channel is a backup. The USB interface 4-5 of the data acquisition controller 4 can be externally connected with a keyboard, a mouse and an external storage medium. The charging port/external power interface 4-7 of the data acquisition controller 4 is used for supplying power to the data acquisition controller. The Ethernet interface 4-8 on the right side of the data acquisition controller 4 is used for establishing communication control acquisition with a computer. The touch control screen 4-9 on the front of the data acquisition controller 4 is used for operating control software and displaying.
Referring to fig. 7, the data acquisition controller 4 includes a software module 5 including a base software module 5-1, a centering posture calculation module 5-2, and a monitoring diagnosis module 5-3; the basic software module 5-1 is connected with the centering gesture calculation module 5-2 and the monitoring diagnosis module 5-3, and the centering gesture calculation module 5-2 is connected with the monitoring diagnosis module 5-3. The basic software module 5-1 has the functions of real-time/post-acquisition analysis parameter setting, data preprocessing, acquisition control, graphic display, data management and the like; the basic software module 5-1 inputs the acquired measured values of the first vertical eddy current displacement sensor 1-1, the second vertical eddy current displacement sensor 1-2, the third vertical eddy current displacement sensor 1-2 and the fourth vertical eddy current displacement sensor 1-4 into the centering gesture calculation module 5-2; the collected measured values of the acceleration sensor 2-1, the second acceleration sensor 2-2, the third acceleration sensor 2-3 and the rotating speed sensor 3 are processed and then input into the monitoring and diagnosis module 5-3. And the basic software module 5-1 performs preprocessing on the data measured by the sensor, wherein the preprocessing comprises AD conversion, digital filtering and calculus processing.
The centering gesture calculation module 5-2 calculates vertical translation, transverse winding and axial winding of the elastic support by combining the structural parameters of the elastic support through the input first vertical eddy current displacement sensor 1-1, the second vertical eddy current displacement sensor 1-2, the third vertical eddy current displacement sensor 1-3 and the fourth vertical eddy current displacement sensor 1-4, and further calculates the centering offset and the bending value of the elastic support relative to the main machine high-elasticity coupler 13, wherein the centering gesture is displayed on the touch control screen 4-9 in real time.
The data adopts a high-speed multi-core control processor in the controller 4, the high-capacity solid state disk is stored, the data operation and reading speed is high, the data acquisition controller 4 is internally provided with a power module which can work independently, and an additionally provided power adapter can be connected with an external power supply 12. The data acquisition controller is provided with a portable handle, which can be conveniently carried and also can be permanently arranged beside the machine.
Example 2
Referring to fig. 1-9, the invention discloses a ship propulsion shafting elastic support centering on-line monitoring method, which is based on the ship propulsion shafting elastic support centering on-line monitoring system and comprises the following specific steps:
Step 1, a first vertical eddy current displacement sensor 1-1, a second vertical eddy current displacement sensor 1-2, a third vertical eddy current displacement sensor 1-3, displacement variation between an upper pressing plate and a lower pressing plate of an elastic support collected by a fourth vertical eddy current displacement sensor 1-4, vertical, transverse and axial vibration acceleration of the elastic support collected by the first acceleration sensor 2-1, the second acceleration sensor 2-2 and the third acceleration sensor 2-3, and shafting rotating speed pulse collected by a rotating speed sensor 3 are uploaded to a basic software module 5-1 of a data collector 4 for preprocessing, wherein the preprocessing comprises AD conversion, digital filtering, calculus processing and the like.
Step 2, the basic software module 5-1 pre-processes the data acquired by the first vertical eddy current displacement sensor 1-1, the second vertical eddy current displacement sensor 1-2, the third vertical eddy current displacement sensor 1-3 and the fourth vertical eddy current displacement sensor 1-4 and then uploads the data to the centering gesture calculation module 5-2, and the centering gesture calculation module 5-2 calculates vertical translation d, transverse winding alpha (transverse rotation around the ship) and axial winding gamma (axial rotation around the ship) of the elastic support according to a certain calculation method and analyzes and obtains a centering offset delta and a bending value epsilon of the elastic support relative to the main machine high-elasticity coupler;
Step 3, the basic software module 5-1 preprocesses the rotating speed pulse acquired by the rotating speed sensor 3 and then uploads the rotating speed pulse to the monitoring and diagnosing module, and the rotating speed signal is obtained through the monitoring and diagnosing module;
Step 4, the basic software module 5-1 pre-processes the data collected by the first acceleration sensor 2-1, the second acceleration sensor 2-2 and the third acceleration sensor 2-3, and then uploads the data to the monitoring and diagnosis module 5-3, and the vibration intensity of the elastic support 10 under different rotating speed working conditions is obtained through calculation of the monitoring and diagnosis module 5-3, and a root mean square value of the vibration speed is generally specified in the national standard and is used as a measurement scale for representing the vibration intensity of the machine, for example:
wherein V rms is vibration intensity, V (T) is a function of vibration speed changing along with time, and T is a measurement period.
And 5, the monitoring and diagnosing module 5-3 records the centering posture value of the elastic support 10 relative to the main machine high-elasticity coupler 13 and the vibration intensity data of the elastic support 10 under different rotating speed working conditions in real time, establishes mathematical connection between the centering posture value and the vibration intensity data, and sets the dynamic centering posture threshold of the elastic support 10 relative to the main machine high-elasticity coupler 13 under different rotating speed working conditions according to the vibration intensity threshold specified by the relevant standard.
According to a further technical scheme, the method further comprises the step 6 of judging a diagnosis result by the monitoring diagnosis module 5-3 according to the centering gesture threshold value, outputting the diagnosis result to the touch display screen 4-9 of the data acquisition controller 4, and displaying an alarm by the touch control screen 4-9 when the centering gesture is abnormal, so as to prompt a worker to carry out fault maintenance.
In the step 2, the calculation formulas of the centering offset value delta and the tortuosity value epsilon are as follows:
Wherein d is the vertical translation amount of the elastic support upper pressing plate 8, alpha is the transverse disturbance amount of the elastic support upper pressing plate 8, gamma is the axial disturbance amount of the elastic support upper pressing plate 8, and beta and theta are intermediate variables; l 1 is the horizontal distance between the first vertical eddy current displacement sensor 1-1 and the second vertical eddy current displacement sensor 1-2, L 2 is the horizontal distance between the second vertical eddy current displacement sensor 1-2 and the fourth vertical eddy current displacement sensor 1-4, L 3 is the horizontal distance between the upper top point of the elastic support close to the high elastic flange end and the central point of the upper pressing plate, L 4 is the diameter of the end surface of the high elastic flange, and L 5 is the vertical distance between the upper top point of the elastic support close to the upper pressing plate plane.
The relation between each variable and the elastic support 10 structure size L 1、L2、L3、L4、L5 and the first vertical eddy current displacement sensor 1-1, the second vertical eddy current displacement sensor 1-2, the third vertical eddy current displacement sensor 1-3 and the real-time value y 1、y2、y3、y4 acquired by the fourth vertical eddy current displacement sensor 1-4 is as follows:
α＝(y1-y3)/L1＝(y2-y4)/L1
γ＝(y3-y4)/L2＝(y1-y2)/L2
θ＝arctan(L3/L5)
β＝arctan(L3/(L5-L4))
d＝(y1+y2+y3+y4)/4
substituting the variables and parameters into a centering offset value delta and a tortuosity value epsilon formula respectively to finally obtain:
therefore, the first vertical eddy current displacement sensor 1-1, the second vertical eddy current displacement sensor 1-2, the third vertical eddy current displacement sensor 1-3 and the fourth vertical eddy current displacement sensor 1-4 can measure the displacement change between the upper pressing plate and the lower pressing plate in real time, and the centering gesture of the elastic support relative to the main machine high-elastic coupling can be calculated in real time by combining the size of the elastic support structure. And 5, calculating to obtain a centering gesture dynamic threshold value according to the step, and realizing real-time on-line monitoring and early warning of the centering gesture.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (6)
1. The monitoring system comprises displacement sensors arranged at four corners of a lower pressure plate of the propulsion shafting elastic support, acceleration sensors arranged along the vertical, transverse and axial directions of the elastic support, a rotating speed sensor arranged at a rotating shaft of a high-elasticity coupler and a data acquisition controller arranged beside the elastic support, wherein the displacement sensors, the acceleration sensors and the rotating speed sensor are electrically connected with the data acquisition controller;
The monitoring method is characterized by comprising the following specific steps of:
Step 1, uploading displacement variation between an upper pressing plate and a lower pressing plate of an elastic support acquired by a displacement sensor, shafting rotating speed pulses acquired by a rotating speed sensor and vertical, transverse and axial vibration acceleration of the elastic support acquired by an acceleration sensor to a basic software module of a data acquisition device for pretreatment;
step 2, the basic software module preprocesses the data acquired by the displacement sensor and then uploads the data to the centering gesture calculation module, and the centering gesture calculation module obtains the vertical translation, the transverse winding and the axial winding of the elastic support according to a certain calculation method and analyzes and obtains the centering gesture, namely the offset value and the bending value, of the elastic support relative to the high-elasticity coupling of the host;
Step 3, the basic software module preprocesses the rotating speed pulse acquired by the rotating speed sensor and then uploads the rotating speed pulse to the monitoring and diagnosis module, and a rotating speed signal is obtained through the monitoring and diagnosis module;
Step 4, the basic software module preprocesses the data acquired by the acceleration sensor and then uploads the data to the monitoring and diagnosis module, and the vibration intensity of the elastic support under the working conditions of different rotating speeds is obtained through calculation of the monitoring and diagnosis module;
Step 5, the monitoring and diagnosing module records the centering attitude value of the elastic support relative to the main machine high-elasticity coupler and the vibration intensity data of the elastic support under different rotating speed working conditions in real time, establishes mathematical connection between the two, and sets the dynamic centering attitude threshold of the elastic support relative to the main machine high-elasticity coupler under different rotating speed working conditions according to the vibration intensity threshold specified by the relevant standard;
in the step 2, the calculation formulas of the centering offset value delta and the tortuosity value epsilon are as follows:
Wherein d is the vertical translation amount of the elastic support upper pressing plate, alpha is the transverse disturbance amount of the elastic support upper pressing plate, gamma is the axial disturbance amount of the elastic support upper pressing plate, beta and theta are intermediate variables, L 3 is the horizontal distance from the upper top point of the elastic support close to the high-elastic flange end to the central point of the upper pressing plate, L 4 is the diameter of the flange end surface, and L 5 is the vertical distance from the upper top point of the elastic support close to the upper pressing plate plane;
The relationship between each variable and the real-time value y 1、y2、y3、y4 acquired by the L 1、L2、L3、L4、L5 and four displacement sensors is as follows:
α＝(y1-y3)/L1＝(y2-y4)/L1
γ＝(y3-y4)/L2＝(y1-y2)/L2
θ＝arctan(L3/L5)
β＝arctan(L3/(L5-L4))
d＝(y1+y2+y3+y4)/4；
L 1 is the horizontal distance between the 1# displacement sensor and the 2# displacement sensor, and L 2 is the horizontal distance between the 2# displacement sensor and the 4# displacement sensor.
2. The method for monitoring the on-line monitoring system for the elastic support of the ship propulsion shafting according to claim 1, wherein the 4 displacement sensors are fixed on the lower elastic support pressure plate through the L-shaped support and are spaced from the upper pressure plate by a preset air gap, and are used for measuring the displacement change between the upper elastic support pressure plate and the lower pressure plate.
3. The method for monitoring the on-line monitoring system for the elastic support of the ship propulsion shafting according to claim 1, wherein the 3 acceleration sensors are fixedly installed in the vertical, transverse and axial directions of the elastic support respectively through bolts or adhesives and are used for measuring the vertical, transverse and axial vibration accelerations of the elastic support so as to calculate the vibration intensity of the elastic support.
4. The method for monitoring the elastic support centering on-line monitoring system of the ship propulsion shafting according to claim 1, wherein the 1 rotation speed sensor is arranged at the rotating shaft of the high-elasticity coupling through a bracket, and the rotation speed pulse is received through a reflector stuck on the rotating shaft, so that the rotation speed of the shafting is calculated.
5. The method for monitoring the elastic support centering on-line monitoring system of the ship propulsion shafting according to claim 1, wherein the data acquisition controller is used for acquiring and analyzing signals of each sensor, calculating the centering posture of the elastic support relative to a host machine and the vibration intensity of the elastic support through a preset calculation method, and displaying and early warning on the touch control screen.
6. The method for monitoring the elastic support centering on-line monitoring system of the ship propulsion shafting according to claim 1, further comprising the step 6 of judging a diagnosis result by the monitoring diagnosis module according to a centering posture threshold value, outputting the diagnosis result to a touch display screen of the data acquisition controller, and displaying an alarm by the touch control screen when the centering posture is abnormal, and prompting a worker to carry out fault maintenance.
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