Test bench for testing the performance of torsional vibration dampers

Abstract

The present invention discloses a test bench for detecting the performance of a torsional vibration damper, and relates to the field of torsional vibration dampers; the torsional vibration damper is driven to rotate by a rotating system, and a torsional excitation system generates an adjustable excitation torque, and an encoder transmits the collected data to a computer through a data acquisition card, and obtains the resonance frequency of the test bench and the torsional vibration angle of the corresponding torsional vibration shaft at the resonance frequency through signal analysis. The present invention has a simple structure, and realizes different excitation frequencies and different torques through an excitation servo motor and an exciter. While detecting the torsional vibration of the torsional vibration damper, the torsional vibration damper is also driven to actively rotate, and the corresponding rotation speed is applied in real time, so that a combination of multiple different parameter motion states can be realized, thereby being able to more comprehensively detect the performance of the torsional vibration damper; the present invention is in line with the situation of engine torsional vibration, has a wider range of applications, good applicability, and a wide range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of torsional vibration dampers, and in particular to a test bench for detecting the performance of torsional vibration dampers. Background Art

[0002] The inherent elasticity of the engine shaft system and the periodic complex harmonic torque acting on it make it inevitable that it will produce torsional vibration. With the continuous strengthening of internal combustion engines, the lengthening of the shaft system, the increase in the torsional flexibility of the shaft system and the increase in the speed, the torsional vibration problem of the shaft system has become increasingly prominent. An effective way to solve the torsional vibration problem is to equip the engine with a torsional vibration damper. Therefore, for the development of torsional vibration dampers, it is necessary to test their performance.

[0003] The performance of torsional vibration dampers can be tested in two ways: First, the damper is subjected to an engine bench test and its performance is analyzed through a set of torsional vibration test equipment. This method directly uses the engine as the source of torsional vibration, and the working conditions are relatively realistic, but the environmental interference noise is complex, which is not conducive to signal analysis and processing, and the test results have large deviations. It also brings about problems such as fuel consumption and air pollution, and it is also inconvenient to install and disassemble the damper. Second, through simulation tests, that is, designing an excitation test bench to simulate the engine's shaft system and its vibration state, the performance of the damper can be judged by measuring relevant parameters. In comparison, the latter has incomparable advantages over the former.

[0004] The applicant is Wuhan University of Technology, patent number 201810037219.7, named as a magnetoelectric torsional vibration damper test bench based on laser testing technology. The test components include a shaft rotation drive system, a torsional vibration excitation system, a torsional vibration simulation shaft and a DC motor. The shaft rotation drive includes a speed control system and a DC motor. The laser testing system is used to directly perform non-contact torsional vibration testing on the shaft. Summary of the invention

[0005] Based on the above description, the present invention proposes a test bench for detecting the performance of a torsional vibration damper. The torsional vibration damper is driven to rotate by a rotating system, and the torsional excitation system generates an adjustable excitation torque. The encoder transmits the collected data to a computer through a data acquisition card, and obtains the resonant frequency of the test bench and the torsional vibration angle of the torsional vibration shaft corresponding to the resonant frequency through signal analysis.

[0006] The technical solution adopted is: a test bench for detecting the performance of the torsional vibration damper, including a rotation system for driving the torsional vibration damper to rotate, a torsional excitation system for making the torsional vibration damper generate adjustable exciting torque and exciting frequency, and a signal acquisition system for collecting torsional data of the torsional vibration damper;

[0007] The rotating system includes a torsional vibration shaft, a rotating servo motor and a torsional vibration damper; one end of the torsional vibration shaft is rigidly connected to the output shaft of the exciter of the torsional vibration system through a coupling, and the other end is connected to the torsional vibration damper through a flange; the torsional vibration shaft is connected to the rotating servo motor through a synchronous pulley device; the rotating servo motor rotates, driving the synchronous belt on the synchronous pulley device, so that the synchronous belt and the torsional vibration shaft move together, thereby realizing the rotation of the torsional vibration damper;

[0008] The torsional vibration excitation system includes a vibration exciter and a vibration servo motor; the output shaft of the vibration servo motor is connected to the vibration exciter through a coupling;

[0009] The vibrator comprises a shell, an eccentric planetary gear system, a sun gear shaft, a sun gear and an output shaft of the vibrator; the shell is cylindrical, comprising an outer shell, a left end cover and a right end cover, the left end cover is fixed by bolts on one side of the shell, and the right end cover is fixed by bolts on the other side, so as to form a closed space; a lifting eye hole and an oil inlet hole are provided on the upper side of the shell, and an oil outlet hole is provided on the lower side; a first planetary carrier and a second planetary carrier are installed in the shell, and the two are arranged correspondingly; a first bearing baffle is installed on the outer side of the first planetary carrier by bolts, and a second bearing baffle is installed on the outer side of the second planetary carrier by bolts; there is a gap between the first bearing baffle and the left end cover; there is a gap between the second bearing baffle and the right end cover; lubricating oil is injected into the vibrator through the oil inlet hole; a number of eccentric planetary gear systems are evenly installed between the first planetary carrier and the second planetary carrier;

[0010] One end of the sun gear shaft is connected to the output shaft of the excitation servo motor through a coupling, and the other end passes through the left end cover, the first bearing baffle, the first planet carrier, the sun gear and the planet bearing on the second planet carrier in sequence for axial fixation. The sun gear shaft is located in the center of the housing;

[0011] The sun gear is fixed to the sun gear shaft axially through the shaft shoulder and the lock nut, and is fixed to the sun gear shaft radially through the top screw and the common flat key;

[0012] The output shaft of the vibrator has a planetary flange at one end, and the planetary flange is connected to the second planetary frame by bolts; the planetary flange is located on the outside of the planetary bearing, and the centers of the two are on the same horizontal line; the other end of the output shaft of the vibrator passes through the right end cover and is rigidly connected to the torsional vibration shaft through a coupling; a number of planetary frame bars are installed between the first planetary frame and the second planetary frame to fix the two;

[0013] A plurality of mounting holes are evenly formed on the first planet carrier and the second planet carrier, and shaft holes are formed on the first bearing baffle and the second bearing baffle at positions corresponding to the mounting holes; the planetary gear eccentric system is installed through the mounting holes and the shaft holes;

[0014] The planetary gear eccentric system comprises a planetary gear shaft, a planetary gear and an eccentric mass block; one end of the planetary gear shaft passes through the mounting hole of the first planet carrier and is installed in the shaft hole of the first bearing baffle plate, and the other end passes through the mounting hole of the second planet carrier and is installed in the shaft hole of the second bearing baffle plate; the planetary gear is radially fixed to the planetary gear shaft by means of a top screw and a common flat key, and is axially fixed to the planetary gear shaft by means of a sleeve; the eccentric mass block is radially fixed to the planetary gear shaft by means of a common flat key;

[0015] The planetary gear meshes with the sun gear; the rotation of the sun gear shaft causes the sun gear to rotate, and at the same time drives the rotation of the eccentric system of the planetary gear, realizing the formation of exciting torque on the output shaft of the exciter;

[0016] The signal acquisition system includes two encoders and a data acquisition card; the encoders are respectively installed at both ends of the torsional vibration shaft; one encoder is installed on the side where the torsional vibration shaft is connected to the output shaft of the exciter, and the other encoder is installed on the side where the torsional vibration shaft is connected to the torsional vibration damper; the encoder transmits the collected data to the computer through the data acquisition card, and obtains the resonant frequency of the test bench and the torsional vibration angle of the torsional vibration shaft corresponding to the resonant frequency through signal analysis.

[0017] Furthermore, rubber gaskets are installed on the inner sides of the left end cover and the right end cover.

[0018] Furthermore, the synchronous pulley device includes a first synchronous pulley, a second synchronous pulley and a synchronous belt; the synchronous belt connects the first synchronous pulley and the second synchronous pulley at the same time, the first synchronous pulley is installed on the output shaft of the rotary servo motor; the second synchronous pulley is installed on the torsional vibration shaft; the rotary servo motor drives the rotation of the first synchronous pulley while the synchronous belt also rotates together, and the synchronous belt drives the second synchronous pulley to rotate, thereby realizing the rotation of the torsional vibration shaft together.

[0019] Furthermore, an adjustable inertia flywheel is installed between the torsional vibration damper and the second synchronous pulley.

[0020] Furthermore, four planet carrier bars are evenly installed between the first planet carrier and the second planet carrier.

[0021] Furthermore, the encoder is a rotary hollow shaft encoder.

[0022] The operation of the present invention is as follows: first, the rotary servo motor is started, and the rotary servo motor drives the torsional vibration shaft to rotate through the synchronous belt on the synchronous pulley device. One end of the torsional vibration shaft is connected to the output shaft of the exciter, and the other end is connected to the adjustable inertia flywheel and the torsional vibration damper in sequence. Then, the exciting servo motor is started to make the test bench reach resonance, so as to test the vibration reduction performance of the torsional vibration damper.

[0023] When the vibration servo motor is started, the sun gear shaft is driven to rotate, which drives the sun gear to rotate. Since the planetary gears in the planetary gear eccentric system are meshed with the sun gear, the rotation of the four planetary gear eccentric systems is realized.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention drives the torsional vibration damper to actively rotate while testing the torsional vibration of the torsional vibration damper, and applies the corresponding rotation speed in real time, which can truly restore the actual working condition of the torsional vibration damper, and the monitoring data can more truly reflect the performance of the torsional vibration damper.

[0026] 2. The present invention realizes different motion conditions of acceleration, uniform speed and deceleration by rotating the servo motor; and then realizes different excitation frequencies and different torques by exciting the servo motor and the exciter, which can realize a combination of multiple motion states with different parameters, thereby being able to more comprehensively test the performance of the torsional vibration damper.

[0027] 3. The present invention can realize resonance of different natural frequencies through an adjustable inertia flywheel, which is more suitable for the torsional vibration of the engine, has a wider application range, good applicability and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 A top view of the present invention;

[0030] Figure 3 It is a schematic diagram of the housing and internal structure of the vibration exciter in the present invention;

[0031] Figure 4 It is a structural schematic diagram of the planetary gear eccentric system in the present invention;

[0032] Figure 5 It is a cross-sectional view of the exciter in the present invention.

[0033] In the attached drawings, 1, torsional vibration shaft; 2, rotating servo motor; 3, torsional vibration damper; 4, exciting servo motor; 5, exciter; 6, coupling; 7, adjustable inertia flywheel; 8, encoder; 9, test bench base; 91, rotating servo motor base; 92, torsional exciting system base; 93, torsional vibration damper base; 94, exciting servo motor support; 95, bearing seat; 56, exciter output shaft; 21, synchronous pulley device; 211, first synchronous pulley; 212, synchronous belt; 213, second synchronous pulley; 51, housing; 511, eyelet hole; 512, oil inlet hole; 52, left end cover ; 53. Planetary gear eccentric system; 54. Sun gear shaft; 55. Sun gear; 56. Exciter output shaft; 57. First planetary carrier; 58. Second planetary carrier; 59. Right end cover; 60. Rubber gasket; 571. First bearing baffle; 581. Second bearing baffle; 61. Planetary carrier bar; 531. Planetary gear shaft; 532. Planetary gear; 533. Eccentric mass block; 541. Skeleton oil seal ring; 542. First bearing; 561. Planetary flange; 582. Planetary bearing; 513. Oil outlet hole. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0035] See also Figures 1 to 5 As shown, a test bench for detecting the performance of a torsional vibration damper includes a rotating system for driving the torsional vibration damper to rotate, a torsional excitation system for causing the torsional vibration damper to generate adjustable exciting torque and exciting frequency, and a signal acquisition system for acquiring torsional data of the torsional vibration damper; a rotating servo motor base 91, a torsional excitation system base 92, and a torsional vibration damper base 93 are installed on a test bench base 9 by means of T-slot nuts and bolts; and five bearing seats 95 are installed on the torsional vibration damper base 93.

[0036] The rotating system includes a torsional vibration shaft 1, a rotating servo motor 2 and a torsional vibration damper 3; one end of the torsional vibration shaft 1 is rigidly connected to the exciter output shaft 56 of the torsional excitation system through a coupling 6, and the other end is connected to the torsional vibration damper 3 through a flange; the torsional vibration shaft 1 is connected to the rotating servo motor 2 through a synchronous pulley device 21; the synchronous pulley device 21 includes a first synchronous pulley 211, a second synchronous pulley 213 and a synchronous belt 212; the synchronous belt 212 simultaneously connects the first synchronous pulley 211 and the second synchronous pulley 213, and the first synchronous pulley 211 is installed on the output shaft of the rotating servo motor 2; the second synchronous pulley 213 is installed on the torsional vibration shaft 1; when the rotating servo motor 2 drives the first synchronous pulley 211 to rotate, the synchronous belt 212 also rotates together, and the synchronous belt 212 drives the second synchronous pulley 213 to rotate, thereby realizing the rotation of the torsional vibration shaft 1 and the rotation of the torsional vibration damper 3.

[0037] The torsional vibration excitation system includes an exciter 5 and an excitation servo motor 4; the output shaft of the excitation servo motor 4 is connected to the exciter 5 through a coupling; the excitation servo motor 4 is installed on the torsional vibration excitation system base 92 through an excitation servo motor support 94;

[0038] The exciter 5 is installed on the torsion excitation system base 92, including a housing, a planetary gear eccentric system 53, a sun gear shaft 54, a sun gear 55 and an exciter output shaft 56; the housing is cylindrical, including an outer shell 51, a left end cover 52 and a right end cover 59. The left end cover 52 is fixed by bolts on one side of the outer shell 51, and the right end cover 59 is fixed by bolts on the other side to form a closed space; a lifting ring hole 511 and an oil inlet hole 512 are opened above the outer shell 51, and an oil outlet hole 513 is opened below; a first planet carrier 57 and a second planet carrier 58 are installed in the housing, and the two are mutually Corresponding settings: a first bearing baffle 571 is installed on the outer side of the first planetary carrier 57 by bolts, and a second bearing baffle 581 is installed on the outer side of the second planetary carrier 58 by bolts; there is a gap between the first bearing baffle 571 and the left end cover 52; there is a gap between the second bearing baffle 581 and the right end cover 59; lubricating oil is injected into the inside of the exciter through the oil inlet hole 512; three planetary gear eccentric systems 53 are evenly installed between the first planetary carrier 57 and the second planetary carrier 58; rubber gaskets 60 are installed on the inner sides of the left end cover 52 and the right end cover 59.

[0039] One end of the sun gear shaft 54 ​​is connected to the output shaft of the excitation servo motor 4 through a coupling, and the other end passes through the left end cover 52, the first bearing baffle 571, the first planet carrier 57, the sun gear 55 and the planet bearing 582 on the second planet carrier 58 in sequence for axial fixation. The sun gear shaft 54 ​​is located at the center of the housing;

[0040] The sun gear 55 is axially fixed to the sun gear shaft 54 ​​through a shaft shoulder and a locking nut, and radially fixed to the sun gear shaft 54 ​​through a top screw and a common flat key;

[0041] One end of the exciter output shaft 56 has a planetary flange 561, which is connected to the second planetary carrier 58 by bolts; the planetary flange 561 is located on the outside of the planetary bearing 582, and the centers of the two are on the same horizontal line; the other end of the exciter output shaft 56 passes through the right end cover 59 and is rigidly connected to the torsional vibration shaft 1 through the coupling 6; four planetary carrier bars 61 are installed between the first planetary carrier 57 and the second planetary carrier 58 to fix the two;

[0042] A plurality of mounting holes are evenly formed on the first planet carrier 57 and the second planet carrier 58, and shaft holes are formed on the first bearing baffle plate 571 and the second bearing baffle plate 581 at positions corresponding to the mounting holes; the planetary gear eccentric system 53 is installed through the mounting holes and the shaft holes;

[0043] The planetary gear eccentric 53 system includes a planetary gear shaft 531, a planetary gear 532 and an eccentric mass block 533; one end of the planetary gear shaft 531 passes through the mounting hole of the first planetary carrier 57 and is installed in the shaft hole of the first bearing baffle 571, and the other end passes through the mounting hole of the second planetary carrier 58 and is installed in the shaft hole of the second bearing baffle 581; the planetary gear 532 is radially fixed to the planetary gear shaft 53 by means of a top screw and a common flat key, and is axially fixed to the planetary gear shaft 531 by means of a sleeve; the eccentric mass block 533 is radially fixed to the planetary gear shaft 531 by means of a common flat key;

[0044] The planetary gear 532 meshes with the sun gear 55; the rotation of the sun gear shaft 54 ​​causes the sun gear 55 to rotate, and at the same time drives the rotation of the planetary gear eccentric system 53, so that the exciter output shaft 56 forms an exciting torque; the sun gear shaft 54 ​​and the left end cover 52, the exciter output shaft 56 and the right end cover 59 are all installed through the skeleton oil seal ring 541 and the first bearing 542.

[0045] The signal acquisition system includes two encoders 8 and a data acquisition card; the encoder 8 is a rotary hollow shaft encoder, which is respectively installed at the two ends of the torsional vibration shaft 1; one encoder is installed on the side where the torsional vibration shaft is connected to the output shaft of the exciter, and the other encoder is installed on the side where the torsional vibration shaft is connected to the torsional vibration damper; the encoder 8 transmits the collected data to the computer through the data acquisition card, and obtains the resonant frequency of the test bench and the torsional vibration angle of the torsional vibration shaft corresponding to the resonant frequency through signal analysis.

[0046] An adjustable inertia flywheel 7 is installed between the torsional vibration damper 3 and the second synchronous pulley 213 .

Claims

1. A test bench for testing the performance of torsional vibration dampers, characterized by: It includes a rotating system for driving the torsional vibration damper to rotate, a torsional excitation system for causing the torsional vibration damper to generate adjustable exciting torque and exciting frequency, and a signal acquisition system for collecting torsional data of the torsional vibration damper; The rotating system comprises a torsional vibration shaft, a rotating servo motor and a torsional vibration damper; one end of the torsional vibration shaft is rigidly connected to the exciter output shaft of the torsional vibration excitation system through a coupling, and the other end is connected to the torsional vibration damper through a flange; the torsional vibration shaft is connected to the rotating servo motor through a synchronous pulley device; the rotating servo motor rotates, driving the synchronous belt on the synchronous pulley device, so that the synchronous belt and the torsional vibration shaft move together, thereby realizing the rotation of the torsional vibration damper; The torsional vibration excitation system includes a vibration exciter and a vibration servo motor; the output shaft of the vibration servo motor is connected to the vibration exciter through a coupling; The exciter comprises a shell, an eccentric planetary gear system, a sun gear shaft, a sun gear and an output shaft of the exciter; the shell is cylindrical, comprising an outer shell, a left end cover and a right end cover, the left end cover is fixed by bolts on one side of the shell, and the right end cover is fixed by bolts on the other side, so as to form a closed space; a hanging ring hole and an oil inlet hole are provided on the upper side of the shell, and an oil outlet hole is provided on the lower side; a first planetary carrier and a second planetary carrier are installed in the shell, and the two are arranged correspondingly; a first bearing baffle is installed on the outer side of the first planetary carrier by bolts, and a second bearing baffle is installed on the outer side of the second planetary carrier by bolts; there is a gap between the first bearing baffle and the left end cover; there is a gap between the second bearing baffle and the right end cover; lubricating oil is injected into the exciter through the oil inlet hole; a number of eccentric planetary gear systems are evenly installed between the first planetary carrier and the second planetary carrier; One end of the sun gear shaft is connected to the output shaft of the excitation servo motor through a coupling, and the other end passes through the left end cover, the first bearing baffle, the first planet carrier, the sun gear and the planet bearing on the second planet carrier in sequence to be axially fixed, and the sun gear shaft is located at the center of the housing; The sun gear is axially fixed to the sun gear shaft by a shaft shoulder and a lock nut, and radially fixed to the sun gear shaft by a top screw and a common flat key; The output shaft of the vibrator has a planetary flange at one end, and the planetary flange is connected to the second planetary frame by bolts; the planetary flange is located on the outside of the planetary bearing, and the centers of the two are on the same horizontal line; the other end of the output shaft of the vibrator passes through the right end cover and is rigidly connected to the torsional vibration shaft through a coupling; a number of planetary frame bars are installed between the first planetary frame and the second planetary frame to fix the two; A plurality of mounting holes are evenly formed on the first planet carrier and the second planet carrier, and shaft holes are formed on the first bearing baffle and the second bearing baffle at positions corresponding to the mounting holes; an eccentric planetary gear system is installed through the mounting holes and the shaft holes; The planetary gear eccentric system comprises a planetary gear shaft, a planetary gear and an eccentric mass block; one end of the planetary gear shaft passes through the mounting hole of the first planet carrier and is installed in the shaft hole of the first bearing baffle, and the other end passes through the mounting hole of the second planet carrier and is installed in the shaft hole of the second bearing baffle; the planetary gear is radially fixed to the planetary gear shaft by means of a top screw and a common flat key, and is axially fixed to the planetary gear shaft by means of a sleeve; the eccentric mass block is radially fixed to the planetary gear shaft by means of a common flat key; The planetary gear is meshed with the sun gear; the rotation of the sun gear shaft causes the sun gear to rotate, and at the same time drives the rotation of the eccentric system of the planetary gear, so that the output shaft of the exciter forms an exciting torque; The synchronous pulley device comprises a first synchronous pulley, a second synchronous pulley and a synchronous belt; the synchronous belt connects the first synchronous pulley and the second synchronous pulley at the same time, the first synchronous pulley is installed on the output shaft of the rotary servo motor; the second synchronous pulley is installed on the torsional vibration shaft; the rotary servo motor drives the first synchronous pulley to rotate while the synchronous belt also rotates together, and the synchronous belt drives the second synchronous pulley to rotate, so that the torsional vibration shaft rotates together; An adjustable inertia flywheel is installed between the torsional vibration damper and the second synchronous pulley; The signal acquisition system includes two encoders and a data acquisition card; the encoders are respectively installed at both ends of the torsional vibration shaft; one encoder is installed on the side where the torsional vibration shaft is connected to the output shaft of the exciter, and the other encoder is installed on the side where the torsional vibration shaft is connected to the torsional vibration damper; the encoder transmits the collected data to the computer through the data acquisition card, and obtains the resonant frequency of the test bench and the torsional vibration angle of the torsional vibration shaft corresponding to the resonant frequency through signal analysis.

2. The test bench for detecting the performance of a torsional vibration damper according to claim 1 is characterized in that Rubber gaskets are installed on the inner sides of the left end cover and the right end cover.

3. The test bench for detecting the performance of a torsional vibration damper according to claim 1 is characterized in that Four planet carrier bars are evenly installed between the first planet carrier and the second planet carrier.

4. The test bench for detecting the performance of a torsional vibration damper according to claim 1, characterized in that The encoder is a rotary hollow shaft encoder.

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