Shafting torsional vibration simulation experiment bench system

Abstract

The invention relates to a shafting torsional vibration simulation experiment bench system. An external power supply supplies power to an on-shaft signal motor and a wireless signal receiving and controlling device through a carbon brush-slip ring power supply system; in the rotating speed operation process of the shaft, the man-machine interaction system sends a control instruction to the wireless signal receiving and controlling device on the shaft through wireless signals, the rotating speed of the signal motor is adjusted, the signal motor drives the vibration testing gear to generate circumferential vibration relative to the shaft through the crank rocker mechanism, and the vibration frequency is consistent with the rotating frequency of the signal motor. And the pulse measurement sensor outputs the simulated torsional vibration signal to the outside in the form of an electric signal. A shaft system torsional vibration signal is decomposed into two independent control parameters of frequency and amplitude through a crank rocker mechanism, an amplitude parameter is converted into a mechanical parameter for control, a frequency parameter is converted into a rotating speed parameter convenient to control, and two-dimensional parameter control of the torsional vibration amplitude and frequency is reduced to single parameter control of frequency control. The control difficulty is reduced; and the control precision is improved.

Description

Technical Field

[0001] The invention relates to a shaft system torsional vibration standard signal simulation system, in particular to a shaft system torsional vibration simulation test bench system. Background Art

[0002] Torsional vibration is one of the common vibration forms of the shaft system, which may become the main excitation source that causes severe vibration and noise in the ship engine structure and power unit. At present, most simulation tests on torsional vibration only simulate the phenomenon, but the vibration amplitude and vibration frequency cannot be accurately controlled. The method used to calibrate the test instrument for measuring the torsional vibration of the shaft system based on the pulse timing method is to calibrate with the help of the torsional secondary excitation signal during the rotation of the universal shaft, but the current research on the torsional secondary excitation during the rotation of the universal shaft is still very immature. Based on the above reasons, there are still major defects in the calibration of the test instrument for measuring the torsional vibration of the shaft system based on the pulse timing method, which is widely used in the torsional vibration test of the shaft system.

[0003] Therefore, a shaft torsional vibration simulation test bench system is needed to simulate the phenomenon of shaft torsional vibration and generate a torsional vibration signal of a given amplitude and frequency. The signal simulation system is used to detect and calibrate the shaft torsional vibration test instrument based on the pulse timing method to measure the shaft torsional vibration, providing a platform for the research on shaft torsional vibration and the calibration of the test instrument. Summary of the invention

[0004] In order to conduct a more in-depth study on the torsional vibration of the shaft system and provide a more accurate platform for calibrating the instrument for torsional vibration measurement based on the pulse timing method, the present invention provides a shaft system torsional vibration simulation test bench system that can accurately control the vibration amplitude and vibration frequency. The amplitude and frequency of the torsional vibration are controlled by mechanical methods and speed control methods respectively, and the control accuracy of each parameter is improved by decomposing the vibration parameters into single parameters for control.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a shaft system torsional vibration simulation test bench system, including a shaft driven by an external power machine, a human-machine interaction system, a carbon brush-slip ring power supply system, a signal motor, a wireless signal receiver and controller, a crank rocker mechanism, a vibration measuring gear, a pulse measurement sensor, and a bearing system. The external power supply supplies power to the signal motor and the wireless signal receiver and controller on the shaft through the carbon brush-slip ring power supply system; the shaft driven by the external power machine runs at a set speed to simulate the average speed of the shaft; when the shaft runs at a certain speed, the human-machine interaction system sends a control instruction to the wireless signal receiver and controller on the shaft through a wireless signal to adjust the speed of the signal motor, and the signal motor drives the vibration measuring gear to generate circumferential vibration relative to the shaft through the crank rocker mechanism, and the vibration frequency is consistent with the rotation frequency of the signal motor; the pulse measurement sensor outputs the simulated torsional vibration signal to the outside world as an electrical signal.

[0006] Furthermore, the crank-rocker mechanism is composed of an eccentric wheel, a connecting rod, a pin shaft and a rocker. The swing amplitude of the rocker is changed by changing the eccentricity of the eccentric wheel, so as to control the reciprocating vibration amplitude of the signal gear. The vibration amplitude is controlled by the crank-rocker mechanism to ensure the traceability of the amplitude parameters, and the precise control of the signal motor speed by wireless signal reception and controller is used to ensure the traceability of the vibration frequency parameters.

[0007] Furthermore, the signal motor is connected to the connecting rod through the eccentric wheel, the connecting rod is connected to the rocker through the pin shaft, and the rocker is fixedly connected to the fixed clamping ring on the shaft through the clamping ring fixing pin shaft; a force-saving lever is formed between the connection point of the connecting rod and the rocker arm, the connection point of the vibration measuring gear and the rocker arm through the swing pin shaft, and the connection point of the rocker arm and the fixed clamping ring, which can reduce the driving torque of the signal motor and improve the speed control accuracy of the signal motor.

[0008] Furthermore, the swing pin and the rocker arm are clearance-matched and can slide relative to each other, thereby balancing the relative movement between the swing pin shaft hole position and the rocker arm during the reciprocating motion of the vibration measuring gear.

[0009] Furthermore, the vibration measuring gear is mounted on the shaft surface through a bearing, and generates relative motion with the shaft in a circumferential direction.

[0010] Furthermore, the signal motor and the wireless signal receiver and controller are symmetrically arranged on both sides of the fixed clamp ring, which can reduce the influence of unbalanced centrifugal force on the signal simulation accuracy.

[0011] Furthermore, the torsional vibration signal is simulated by the crank-rocker mechanism and the vibration measuring gear and bearing system which rotate together at the same speed and have relative motion at the same time;

[0012] Furthermore, the torsional vibration signal is decomposed into two independent control parameters, namely, frequency and amplitude. The amplitude parameter is converted into a fixed mechanical parameter of the eccentricity of the eccentric wheel, and the frequency parameter is converted into a speed parameter that is easy to control.

[0013] The beneficial effects of the present invention are:

[0014] The present invention decomposes the shaft system torsional vibration signal into two independent control parameters, frequency and amplitude, through a crank rocker mechanism, and converts the amplitude parameter into a mechanical parameter for control, and converts the frequency parameter into a speed parameter that is easy to control, thereby reducing the two-dimensional parameter control of the amplitude and frequency of the torsional vibration to a single parameter control of the frequency control, thereby reducing the control difficulty and improving the control accuracy. The present invention effectively solves the control accuracy and traceability problems of the torsional vibration parameters during the operation of the shaft system at a certain speed, and provides an accurate and controllable signal source for the calibration of the shaft system torsional vibration test instrument based on the pulse timing method. It also provides a reliable and effective test platform for further research on the torsional vibration of the shaft system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall composition relationship diagram of the shafting torsional vibration signal simulation system;

[0016] Figure 2 It is a model diagram of the shafting torsional vibration signal simulation system;

[0017] Figure 3 It is the AA section view of the shafting torsional vibration signal simulation system model;

[0018] Figure 4 It is the BB section view of the shafting torsional vibration signal simulation system model;

[0019] Figure 5 It is a schematic diagram of the CC section position of the shafting torsional vibration signal simulation system model;

[0020] Figure 6 It is the CC section view of the shafting torsional vibration signal simulation system model;

[0021] The meanings of the serial numbers in the accompanying drawings are explained as follows:

[0022] 1-shaft; 2-conductive slip ring; 3-signal motor; 4-vibration measuring gear plate; 5-wireless signal receiving and controller; 6-carbon brush; 7-carbon brush bracket; 8-pulse measuring sensor; 9-sensor bracket; 10-bearing; 11-signal motor shaft; 12-eccentric wheel; 13-connecting rod; 14-pin shaft; 15-rocker; 16-swing pin shaft; 17-clamp fixing pin shaft; 18-signal motor fixing pressure plate; 19-fixing clamping ring. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 6 As shown, a shaft torsional vibration simulation test bench system of the present invention includes a shaft driven by an external power machine, a human-machine interaction system, a carbon brush-slip ring power supply system, a signal motor and a fixed clamping ring system, a wireless signal receiver and controller, a crank rocker mechanism, a vibration measuring gear and bearing system, a pulse measurement sensor, etc.

[0025] A carbon brush-slip ring power supply system, a signal motor and a fixed clamping ring system are installed on the shaft 1 driven by the external power machine.

[0026] The shaft 1 driven by the external power machine runs at a set speed to simulate the average speed of the shaft. The external power supply supplies power to the signal motor 3 and the wireless signal receiver and controller 5 on the shaft through the carbon brush-slip ring power supply system. When the shaft 1 runs at a certain speed, the human-machine interaction system sends control instructions to the wireless signal receiver and controller 5 on the shaft 1 through wireless signals to adjust the speed of the signal motor. The signal motor 3 drives the vibration measuring gear plate 4 to generate circumferential vibration relative to the rotating shaft 1 through the crank rocker mechanism, and the vibration frequency is consistent with the rotation frequency of the signal motor.

[0027] Before starting the test system, the eccentric wheel installed on the signal motor shaft is replaced and the eccentricity of the eccentric wheel is changed to realize the crank rotation radius, thereby changing the swing amplitude of the rocker and controlling the reciprocating vibration amplitude of the gear. The shaft driven by the external power machine runs at a set speed to simulate the average speed of torsional vibration. The amplitude parameters are traceable by controlling the vibration amplitude in a fully mechanical way. The vibration frequency parameters are traceable by receiving wireless signals and accurately controlling the speed of the signal motor by the controller 5.

[0028] The operating mechanism of the shaft torsional vibration simulation test bench system is as follows:

[0029] (1) According to the test requirements, an eccentric wheel 12 with the same eccentricity and vibration amplitude parameters is installed on the shaft of the signal motor 3, and the speed of the external power machine and the speed of the signal motor are set through the human-machine interaction system. The shaft torsional vibration simulation test bench system is started, and the human-machine interaction system controls the external power machine to drive the shaft to operate at the set speed. The external power supply supplies power to the on-shaft signal receiver and controller 5 and the signal motor 3 through the carbon brush-slip ring power supply system. At the same time, the human-machine interaction system sends the signal motor speed control signal in a wireless form, and the on-shaft signal receiver and controller 5 receives the signal motor 3 speed control signal sent by the human-machine interaction system and realizes precise control of the speed of the signal motor 3. The signal motor 3 operates at the set speed to drive the crank rocker mechanism to move. The crank rocker mechanism consists of an eccentric wheel 12, a connecting rod 13, a pin 14 and a rocker 15. The signal motor 3 is connected to the connecting rod 13 through the eccentric wheel 12, and the connecting rod 13 is connected to the rocker 15 through the pin 14. The rocker 15 is then fixed to the fixed snap ring 19 on the shaft through the snap ring fixing pin 17. The vibration measuring gear 4 is installed on the surface of the shaft 1 through the bearing 10, and can generate relative movement with the shaft 1 in the circumferential direction. A pin hole is provided on the vibration measuring gear 4, and the pin portion of the swing pin 16 is installed in the pin hole. The slot portion of the swing pin 16 is fixed on the arm of the rocker 15 of the crank rocker mechanism, and can generate relative sliding with the rocker 15. During the process of the signal motor 3 driving the crank rocker mechanism to move, the rocker 15 reciprocates and drives the vibration measuring gear 4 to reciprocate along the circumferential direction of the shaft through the swing pin 16, generating circumferential vibration with an amplitude corresponding to the eccentricity of the eccentric wheel 12. The pulse measurement sensor 8 outputs the simulated torsional vibration signal to the outside world as an electrical signal.

[0030] (2) In the initial static state, the eccentric wheel on the output shaft of the signal motor is replaced, and an eccentric wheel with an eccentric distance consistent with the simulated amplitude of the torsional vibration is installed to control the amplitude of the simulated torsional vibration signal.

[0031] (3) The human-machine interaction system generates an average speed signal of torsional vibration by controlling the external power machine to drive the shaft 1 to rotate. In the process, the torsional vibration signal simulates the rotation of the shaft part of the experimental system.

[0032] (4) The external power supply supplies power to the on-axis signal receiver and controller 5 and the signal motor 3 through a carbon brush-slip ring power supply system.

[0033] (5) A force-saving lever is formed between the connection point between the crank-rocker mechanism connecting rod and the rocker, the connection point between the vibration measuring gear 4 and the rocker 15 via the swing pin 16, and the connection point between the rocker 15 and the fixed clamping ring, thereby reducing the driving torque of the signal motor and improving the speed control accuracy of the signal motor.

[0034] (6) The external power supply supplies power to the on-axis signal receiver and controller and the signal motor through the carbon brush-slip ring power supply system. At the same time, the human-machine interaction system sends the signal motor speed control signal wirelessly, and the on-axis signal receiver and controller receives the signal motor speed control signal sent by the human-machine interaction system and realizes precise control of the signal motor speed. This realizes the control of the torsional vibration frequency.

Claims

1. A shaft torsional vibration simulation test bench system, characterized by: It includes a shaft driven by an external power machine, a human-machine interaction system, a carbon brush-slip ring power supply system, a signal motor, a wireless signal receiver and controller, a crank rocker mechanism, a vibration measuring gear, a pulse measurement sensor, and a bearing system. The external power supply supplies power to the signal motor and the wireless signal receiver and controller on the shaft through the carbon brush-slip ring power supply system; the shaft driven by the external power machine runs at a set speed to simulate the average speed of the shaft; when the shaft runs at a certain speed, the human-machine interaction system sends control instructions to the wireless signal receiver and controller on the shaft through wireless signals to adjust the speed of the signal motor. The signal motor drives the vibration measuring gear to generate circumferential vibration relative to the shaft through the crank rocker mechanism, and the vibration frequency is consistent with the rotation frequency of the signal motor; the pulse measurement sensor outputs the simulated torsional vibration signal to the outside world as an electrical signal.

2. The shafting torsional vibration simulation test bench system according to claim 1 is characterized in that: The crank-rocker mechanism consists of an eccentric wheel, a connecting rod, a pin and a rocker. The swing amplitude of the rocker is changed by changing the eccentricity of the eccentric wheel to control the reciprocating vibration amplitude of the signal gear. The vibration amplitude is controlled by the crank-rocker mechanism to ensure the traceability of the amplitude parameters. The precise control of the signal motor speed by wireless signal reception and the controller can ensure the traceability of the vibration frequency parameters.

3. The shafting torsional vibration simulation test bench system according to claim 2 is characterized in that: The signal motor is connected to the connecting rod through the eccentric wheel, the connecting rod is connected to the rocker through the pin shaft, and the rocker is fixedly connected to the fixed clamping ring on the shaft through the clamping ring fixing pin shaft; a force-saving lever is formed between the connecting point of the connecting rod and the rocker arm, the connecting point of the vibration measuring gear and the rocker arm through the swing pin shaft, and the connecting point of the rocker arm and the fixed clamping ring, which can reduce the driving torque of the signal motor and improve the speed control accuracy of the signal motor.

4. The shafting torsional vibration simulation test bench system according to claim 3 is characterized in that: The swing pin shaft and the rocker arm are matched with clearance, and can slide relative to each other, so as to balance the relative movement between the swing pin shaft hole position and the rocker arm during the reciprocating movement of the vibration measuring gear.

5. The shafting torsional vibration simulation test bench system according to claim 1 is characterized in that: The vibration measuring gear is installed on the shaft surface through a bearing and generates relative motion with the shaft in the circumferential direction.

6. The shafting torsional vibration simulation test bench system according to claim 1 is characterized in that: The signal motor and the wireless signal receiver and controller are symmetrically arranged on both sides of the fixed clamp ring, which can reduce the influence of unbalanced centrifugal force on the signal simulation accuracy.

7. The shafting torsional vibration simulation test bench system according to claim 1 is characterized by: The torsional vibration signal is simulated by the crank-rocker mechanism and the vibration measuring gear and bearing system, which rotate together at the same speed and have relative motion.

8. The shafting torsional vibration simulation test bench system according to claim 1 is characterized by: The torsional vibration signal is decomposed into two independent control parameters, frequency and amplitude. The amplitude parameter is converted into a fixed mechanical parameter of the eccentricity of the eccentric wheel, and the frequency parameter is converted into a speed parameter that is easy to control.

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