CN110567709A - Equivalent constant-load simulation loading test system for friction plate tooth part - Google Patents
Equivalent constant-load simulation loading test system for friction plate tooth part Download PDFInfo
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- CN110567709A CN110567709A CN201910748180.4A CN201910748180A CN110567709A CN 110567709 A CN110567709 A CN 110567709A CN 201910748180 A CN201910748180 A CN 201910748180A CN 110567709 A CN110567709 A CN 110567709A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
- G01B11/162—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by speckle- or shearing interferometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
Abstract
the invention discloses an equivalent constant load simulation loading test system for a friction plate tooth part, which comprises a loading device, a high-speed camera, a digital image processing module, a strain signal acquisition module, a data processing module and a control module, wherein the loading device is connected with the high-speed camera; the loading device simulates the tension-compression coupled vibration fatigue load caused by the contact impact force of two adjacent teeth, the high-speed camera shoots a moving process picture of the meshing tooth surface under the high-speed rotating condition, and the digital image processing module carries out digital image technical analysis on the moving process picture to obtain the local stress, strain and displacement information of the gear; the strain signal acquisition system acquires strain information of the tooth face part of the friction plate; the data processing module is combined with the digital image processing module and the data of the strain signal acquisition module to analyze the corresponding relation between the tooth flank load and the tooth root load; the control module calculates compensation control quantity according to the information of the data processing module and the target loading information and feeds the compensation control quantity back to the loading device, and equivalent constant load simulation loading of the friction plate tooth part is achieved.
Description
Technical Field
The invention relates to a simulation loading test system, in particular to a test system for simulation loading of a friction plate tooth part, and belongs to the technical field of test equipment.
Background
In the running process of a vehicle, a gear shifting control element is used as a key component of a transmission system, so that failure problems such as fatigue fracture, fatigue deformation of a contact surface and the like often occur, the braking performance of the vehicle is seriously influenced, and the service life of a transmission device is seriously limited to be greatly prolonged. The load borne by the tooth part of the gear shifting control element is random load, the test result dispersion coefficient on the existing friction plate dynamic strength test bed is large, the comparability is poor, the data reliability is low, time and cost are very high, and the load type borne by the tooth part cannot be decoupled and analyzed.
from the point of view of the effect of fatigue damage, the end result under random loading or constant amplitude cyclic loading will be to cause the damage state of the component to reach a critical value and failure will occur. It can be considered that corresponding to a random load process, there must be a constant load equivalent to the random load process, so that the components are damaged at the same time under the same initial state and the same action time, and the overall damage of the components caused by the random load and the constant load is considered to be equivalent. Therefore, the research on the equivalent constant-load simulation loading system of the friction plate tooth part has important significance on the analysis of the dynamic strength of the friction plate.
in the process of a friction plate loading test, a loading device usually adopts fixed frequency to load a test piece within a period of time to obtain local stress change and observe the phenomenon of occurrence of vibration cracks, along with the change of loading time, the loading force acting on the tooth parts can be changed due to abrasion of the parts where the tooth parts are mutually meshed or the matching precision error of the device, and the simulation loading of equivalent constant load cannot be really realized.
Disclosure of Invention
In view of the above, the invention provides an equivalent constant load simulation loading test system for a friction plate tooth part, which simulates a tension-compression coupled vibration fatigue load caused by contact impact force of two adjacent teeth through a loading device, and performs feedback control on the loading device after acquiring vibration period and fatigue load information to realize equivalent constant loading on the friction plate tooth part.
An equivalent constant-load simulation loading test system for a friction plate tooth part comprises a loading device, a high-speed camera, a digital image processing module, a strain signal acquisition module, a data processing module and a control module;
The loading device simulates the vibration fatigue load of tension-compression coupling caused by the contact impact force of two adjacent teeth;
the high-speed camera shoots a moving process picture of the meshing tooth surface under the high-speed rotation condition;
The digital image processing module carries out digital image technical analysis on the moving process picture to acquire local stress, strain and displacement information of the gear;
The strain signal acquisition module acquires strain information of the tooth face part of the friction plate;
the data processing module is combined with the digital image processing module and the data of the strain signal acquisition module to analyze the corresponding relation between the tooth flank load and the tooth root load;
and the control module calculates compensation control quantity according to the information of the data processing module and the target loading information and feeds the compensation control quantity back to the loading device, so that equivalent constant load simulation loading of the friction plate tooth part is realized.
Furthermore, DIC speckle manufacturing is carried out on the part of the outer hub of the friction plate in the loading device by adopting a paint spraying and etching method, a 200W LED lamp is arranged at a collecting area to serve as a light source, after the focal distance of the high-speed camera is adjusted, the field of view of 1200 x 800 pixels is set, the collecting speed of 10000 frames/second is set, and the vibration frequency, the strain and the load characteristics between the inner tooth and the outer tooth are obtained.
Further, the digital image technology is to track the movement of points to obtain the deformation information of the object surface by matching the geometric points on the digital speckle images of the object surface under different states.
Further, the loading device comprises a base, a power system and a transmission mechanism, and a mounting limiting mechanism, a protective box, external teeth and internal teeth, wherein the external teeth are friction plates to be tested, and the internal teeth are provided with external tooth pairs;
The power system and the protection box are fixedly connected on the base, the installation limiting mechanism is fixedly connected on the protection box, the power system is connected with the transmission mechanism, the transmission mechanism is fixedly connected with the inner teeth and then installed in the protection box, the outer teeth and the installation limiting mechanism are matched and installed, then radial displacement is restrained, small gaps are formed between the outer teeth and the installation limiting mechanism, free vibration is guaranteed, and the outer teeth also have freedom degree of rotation along the circumferential direction; the external tooth pairs of the internal teeth are meshed with the internal tooth pairs of the external teeth; the power system provides a power source for the transmission mechanism connected with the power source, the transmission mechanism converts the linear reciprocating motion generated by the power source into the circular motion of the inner teeth, the continuous vibration of the inner teeth and the outer teeth is realized, and the power system receives a control signal of the control module to control the torsional vibration frequency, the torsional vibration amplitude and the load amplitude generated by the control module.
Further, the power system comprises an electromagnetic vibration exciter and a bracket; the exciting force of the electromagnetic vibration exciter is 0-10000N adjustable; the frequency is adjustable between 0Hz and 200 Hz; the amplitude is adjustable from 0 mm to 20 mm; the loading and testing under different working conditions are realized by utilizing the adjustability of the parameters of the electromagnetic vibration exciter, and the electromagnetic system provides power for the electromagnetic vibration exciter.
Further, the transmission mechanism comprises a transmission rod, a rocker arm and a shaft disc; one end of the transmission rod is movably connected with the output end of the electromagnetic vibration exciter, the other end of the transmission rod is movably connected with one end of the rocker arm, the other end of the rocker arm is movably connected with a shaft disc fixed on the protection box, and the inner teeth are fixedly connected with one end, corresponding to the shaft disc, of the rocker arm.
further, installation stop gear is including solid fixed ring and fender ring, have an annular step that holds the external tooth on solid fixed ring's the anchor ring, the external tooth is installed and will keep off the ring after in annular step and fix on solid fixed ring, keeps off the ring and restricts the external tooth in annular step, has the close clearance when the radial displacement of external tooth is retrained and guarantees its free vibration, and the external tooth still has along solid fixed ring axis pivoted degree of freedom.
furthermore, the external teeth adopt complete friction plates or are divided into multiple sections of samples, and the multiple samples can be tested simultaneously by dividing the external teeth into the multiple sections of samples.
Has the advantages that:
1. The data processing module of the invention adopts a probability statistical method to process, adopts a rain flow counting method to obtain a load spectrum, can obtain a corresponding equivalent fatigue load based on a linear fatigue accumulated damage theory, and can obtain an S-N curve through a large number of working condition tests. Meanwhile, the control module performs user-defined load input of the tooth equivalent constant load simulation loading device to realize equivalent loading of the test load.
2. The loading device adopts a high-performance electromagnetic vibration exciter to provide a power source, the inner teeth are fixedly connected with the rocker arm, and the rocker arm and the electromagnetic vibration exciter are hinged together by adopting a transmission rod. The electromagnetic vibration exciter transmits alternating load to one end, far away from the inner teeth, of the rocker arm through transmission, the rocker arm swings up and down circularly and simultaneously drives the inner teeth to vibrate along the circumferential direction, continuous vibration of the inner teeth and the outer teeth is achieved, and the abrasion failure characteristics of the friction plate inner gear pair under the influence of different impact amplitudes, frequencies and impact forces can be simulated.
3. the loading device is convenient for assembling, disassembling and replacing the test piece, the main body framework adopts an integrated assembling form of each functional module, each module of the test platform has a relative independent structure, the modules are mutually matched without interference influence, and the loading device is convenient to install, adjust and disassemble and high in universality.
4. the loading device has high safety, and the safety of the test process is fully considered in the platform design. The protective shell is designed on the platform, so that the error collision of personnel is avoided, a relatively closed test environment is provided, and the test is ensured to be carried out without interference; simultaneously, this test bench belongs to high frequency impact vibration equipment, and in the experimental test process, the friction disc receives fatigue load, and the extreme condition such as fracture departure can appear, increases the emergence that the above-mentioned incident can be avoided to the sound insulation protection case to noise abatement by a wide margin.
5. the loading device has high reliability and practicability, adopts a simple and reasonable structural design for vibration reduction and friction reduction, can avoid unpredictable test errors caused by excessively complex structure as much as possible, and eliminates uncertain factors influencing test results.
6. The friction plates are vertically arranged, so that the simultaneous loading test of a plurality of friction plates with few teeth can be met, and the consistency of the load and boundary conditions of the friction plates with few teeth can be ensured. The installation limiting mechanism restrains the radial displacement of the friction plate with few teeth, and meanwhile, a plurality of gaps are reserved, so that the free vibration of the friction plate is guaranteed, and the real load working condition of the full-size friction plate can be simulated.
7. The internal teeth of the loading device adopt three symmetrical gear structures at the outer edge of the inner ring, the structures are symmetrical, the additional vibration effect caused by mass eccentricity is avoided, and the mass layout of the structures is beneficial to reducing the rotational inertia.
Drawings
FIG. 1 is a schematic diagram of an equivalent constant load simulation loading test system for a friction plate tooth part according to the present invention;
FIG. 2 is a front view of the loading device of the present invention;
FIG. 3 is a rear view of the loading unit of the present invention (with the protective case removed);
FIG. 4 is a schematic view showing the installation relationship between the inner and outer teeth and the installation limiting mechanism of the loading device of the present invention (the outer teeth are three segments of samples);
FIG. 5 is a schematic view of the installation relationship between the inner and outer teeth and the installation limiting mechanism of the loading device of the present invention (the outer teeth adopt complete friction plates);
FIG. 6 is a schematic view of the installation relationship between the installation limiting mechanism and the external teeth of the loading device of the present invention;
FIG. 7 is a schematic view of the connection of the transmission mechanism of the loading device according to the present invention;
FIG. 8 is a schematic view of the mounting relationship between the rocker arm and the hub in the loading device of the present invention;
Fig. 9 is a schematic view of the installation relationship between the internal teeth and the adjusting disk in the loading device of the present invention.
Fig. 10 is a basic schematic diagram of digital image technology.
the vibration damper comprises a 1-electromagnetic vibration exciter, a 2-external tooth, a 3-internal tooth, a 4-rocker arm, a 5-transmission rod, a 6-fixing ring, a 7-baffle ring, an 8-protection box, a 9-base, a 10-shaft disc, an 11-anti-loose bolt, a 12-adjusting disc, a 13-clamp spring, a 14-shaft sleeve and a 15-gasket.
Detailed Description
the invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in fig. 1, the invention provides an equivalent constant load simulation loading test system for a friction plate tooth part, which comprises a loading device, a high-speed camera, a digital image processing module, a strain signal acquisition module, a data processing module and a control module;
the loading device simulates the vibration fatigue load of tension-compression coupling caused by the contact impact force of two adjacent teeth;
a high-speed camera shoots a moving process picture of an engaged tooth surface under a high-speed rotating condition;
The digital image processing module carries out digital image technical analysis on the moving process picture to acquire local stress, strain and displacement information of the gear;
the strain signal acquisition system acquires strain information of the tooth face part of the friction plate, the latest crack expansion strain gauge is adhered to the bottom part to the outer edge part of a typical tooth, the crack expansion strain gauge can be locally broken when a crack expands to generate a load signal, the load signal is used for testing and obtaining information such as the local fracture stress and crack expansion speed of crack expansion, and the sampling rate of 10-100 MHz is obtained by connecting with a super dynamic strain gauge.
The data processing module is combined with the digital image processing module and the data of the strain signal acquisition module to analyze the corresponding relation between the tooth flank load and the tooth root load;
the control module calculates compensation control quantity according to the information of the data processing module and the target loading information and feeds the compensation control quantity back to the loading device, and equivalent constant load simulation loading of the friction plate tooth part is achieved.
The control module establishes a refined numerical calculation model of the vibration equivalent dead load simulation of the inner gear and the outer gear by using LS-DYNA, performs reciprocating 200Hz forced displacement rotation loading at the circle center of the inner gear, and the tooth part in contact with the outer gear (friction plate) generates high-frequency collision; and judging the torque, inertia and load required by the high-frequency vibration of the internal teeth.
The CONTACT model adopts the CONTACT _ AUTOMATIC _ SINGLE _ SURFACace SINGLE-side AUTOMATIC CONTACT, can conveniently judge the CONTACT of the responsible curved SURFACE, is used for the AUTOMATIC judgment of the CONTACT of the tooth SURFACE, and calculates the CONTACT load by a penalty function method. The internal teeth are provided with forced displacement loading, and the outer edge part or the edge part of the external teeth is provided with displacement boundary conditions to prevent the external teeth from sliding out, so that the real load working condition of the whole teeth is simulated.
As shown in fig. 2 and 3, the loading device comprises a base 9, an electromagnetic vibration exciter 1, a rocker arm 4, a transmission rod 5, a shaft disc 10, a fixing ring 6, a baffle ring 7, a protection box 8, external teeth 2 and internal teeth 3, wherein the external teeth 2 are friction plates to be tested, and the internal teeth 3 are external tooth pairs meshed with the internal tooth pairs of the friction plates;
the electromagnetic vibration exciter 1 is connected to a base 9 through a support, a protection box 8 is also fixedly connected to the base 9, a fixing ring 6 is fixedly connected to the protection box 8, a baffle ring 7 limits the external teeth 2 on the fixing ring 6, small gaps are formed when the radial displacement of the external teeth 2 is limited to ensure free vibration, and the external teeth 2 also have freedom degree of rotation along the circumferential direction; one end of a transmission rod 5 is movably connected with the output end of the electromagnetic vibration exciter 1, the other end of the transmission rod 5 is movably connected with one end of a rocker arm 4, the other end of the rocker arm 4 is movably connected with a shaft disc 10 fixed on the protection box, an internal tooth 3 is fixedly connected with one end, corresponding to the shaft disc 10, of the rocker arm 4, and an external tooth pair of the internal tooth 3 is meshed with an internal tooth pair of the external tooth 2; the electromagnetic vibration exciter 1 provides a power source for a transmission rod 5 connected with the electromagnetic vibration exciter 1, the transmission rod 5 pushes the rocker arm 4 to rotate around the central axis of the shaft disc 10, the linear reciprocating motion generated by the electromagnetic vibration exciter 1 is converted into the circular motion of the inner teeth 3, the continuous vibration of the inner teeth 3 and the outer teeth 2 is realized, and the control module controls the torsional vibration frequency, the torsional vibration amplitude and the load amplitude generated by the electromagnetic vibration exciter 1.
the outer toothing 2 in fig. 2-4 is divided into three segments, as is the retaining ring 7 corresponding to the outer toothing 2. The outer teeth in the attached figure 4 are complete friction plates, and the benefit of segmentation is that the simultaneous test of three samples can be realized, so that the test efficiency is improved.
the shape of the internal teeth 3 is designed into a three-jaw gear, so that the structure mass is reduced, the rotational inertia is reduced, the load of a system is reduced, and the service life is prolonged without influencing the experimental purpose.
As shown in fig. 6, solid fixed ring 6 constitutes the installation stop gear who installs external tooth 2 on guard box 8 with keeping off ring 7 jointly, have an annular step that holds the external tooth on solid fixed ring 6's the ring surface, external tooth 2 is installed and is fixed on solid fixed ring 6 with keeping off ring 7 after in annular step again, keep off ring 7 with the external tooth restriction in annular step, the radial displacement of external tooth 2 has the close clearance when restricting and guarantees its free vibration, external tooth 2 still has along solid fixed ring axis pivoted degree of freedom.
As shown in fig. 7, the transmission rod 5, the rocker arm 4 and the shaft disc 10 together form a transmission mechanism, wherein the shaft disc 10 has a central shaft and a chassis, the central shaft is used for matching with a central hole on the rocker arm, the shaft disc 10 is used for fixing with the protection box 8, an installation groove for installing the internal teeth 3 is further arranged at one end of the rocker arm 4 matching with the shaft disc 10, and the above structure can convert the reciprocating linear motion of the electromagnetic vibration exciter 1 into rotation around the shaft disc 10.
As shown in figure 8, in order to reduce the motion friction and the resistance, tin bronze shaft sleeves are arranged inside the mounting holes in the rocker arm 4, and tin bronze gaskets are mounted between the rocker arm 4 and the shaft discs.
As shown in fig. 9, the internal teeth 3 are mounted on the rocker arm 4 through an adjusting plate 12, and the two are fixed through a locking bolt 11 and a snap spring 13.
As shown in fig. 10, the digital image technology tracks the movement of points to obtain the deformation information of the object surface by matching the geometric points on the digitized speckle images of the object surface in different states. As shown in the following figure, the image before deformation Is defined as Is, and the image after deformation Is defined as It. And selecting a characteristic speckle f of the point P to track the point P on the source image Is, searching a speckle pattern g which Is most matched with the point P on the target image, wherein the corresponding point Q Is the deformed position of the point P. The speckle points are different from the surrounding points, and a small area around each point is called a sub-area. The sub-area with a certain point as the center on the speckle field can be used as a carrier of the displacement of the point, and the displacement of the point can be obtained by searching and analyzing the movement and the change of the sub-area. The reference region S centered on the feature point M is a sub-region having a size of M × M pixels, and when the surface moves, the sub-region S moves to the position of the sub-region S, so that the position M1 at which the feature point M is deformed can be obtained, and the displacement of the point M can be obtained. This is the basic principle of mathematical correlation matching for DIC methods.
a correlation coefficient C is usually defined in the process to indicate the matching degree of the speckle patterns of the two points of M and M1, and the extreme point indicates the best match. The matching search algorithm of DIC can reach the precision of pixel level, but the precision can not meet the precision requirement of routine experiment, so after completing the matching of pixel level, the special mathematical method is further used to obtain the position of the matching point of sub-pixel level, so as to obtain higher measurement precision. For high quality speckle patterns, the displacement measurement accuracy of DIC can reach 0.01 pixel.
and (3) carrying out high-speed photographic frequency analysis under 1500-revolution (excitation-free) typical working conditions, intercepting 2s of rotation images under rotation stability, selecting a section of typical image, and calculating the frequency through the relative displacement change between the inner tooth and the outer tooth. At the moment when t is 0, the external teeth and the internal teeth collide at the lower part, and a larger gap is reserved at the upper part; as time passes, the lower relative distance between the inner and outer teeth gradually increases, and the upper relative distance gradually decreases until time t becomes 3500 μ s, at which time the outer teeth and the inner teeth collide again, and the collision point at this time is the upper direction. Therefore, 3500 μ s is half cycle of this condition, so the collision frequency between the inner and outer teeth in this condition is about 142Hz, which is far more than the fundamental frequency of 25Hz (1500 revolutions) of the inner hub loading itself. Therefore, the frequency doubling characteristic of the friction plate in the rotation process can be obtained from the result. The digital image processing module can acquire displacement, speed, strain and stress information of the grid points of the acquisition area.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An equivalent constant-load simulation loading test system for a friction plate tooth part is characterized by comprising a loading device, a high-speed camera, a digital image processing module, a strain signal acquisition module, a data processing module and a control module;
The loading device simulates the vibration fatigue load of tension-compression coupling caused by the contact impact force of two adjacent teeth;
The high-speed camera shoots a moving process picture of the meshing tooth surface under the high-speed rotation condition;
The digital image processing module carries out digital image technical analysis on the moving process picture to acquire local stress, strain and displacement information of the gear;
The strain signal acquisition system acquires strain information of the tooth face part of the friction plate;
The data processing module is combined with the digital image processing module and the data of the strain signal acquisition module to analyze the corresponding relation between the tooth flank load and the tooth root load;
And the control module calculates compensation control quantity according to the information of the data processing module and the target loading information and feeds the compensation control quantity back to the loading device, so that equivalent constant load simulation loading of the friction plate tooth part is realized.
2. the equivalent dead load simulation loading test system of friction disc tooth portion of claim 1, characterized in that, the friction disc in the loading device adopts the method of spraying paint + etching to its outer hub part DIC speckle preparation, sets up 200W LED lamp as the light source at the collection region, and after the high-speed camera has adjusted the focus, set up 1200 x 800 pixel's field of vision and 10000 frames/second of collection speed, obtain the vibration frequency between the internal and external teeth, strain and load characteristic.
3. The equivalent constant-load analog loading test system for the friction plate teeth part as claimed in claim 1 or 2, wherein the digital image technology is to track the movement of points to obtain the deformation information of the object surface by matching the geometric points on the digital speckle images of the object surface in different states.
4. The equivalent dead load simulation loading test system of friction plate tooth portion of claim 3, characterized in that, the loading device includes base, driving system, drive mechanism, installation limit mechanism, guard box, external tooth and internal tooth, wherein, the external tooth is the friction plate to be tested, and the internal tooth has external tooth pair;
The power system and the protection box are fixedly connected on the base, the installation limiting mechanism is fixedly connected on the protection box, the power system is connected with the transmission mechanism, the transmission mechanism is fixedly connected with the inner teeth and then installed in the protection box, the outer teeth and the installation limiting mechanism are matched and installed, then radial displacement is restrained, small gaps are formed between the outer teeth and the installation limiting mechanism, free vibration is guaranteed, and the outer teeth also have freedom degree of rotation along the circumferential direction; the external tooth pairs of the internal teeth are meshed with the internal tooth pairs of the external teeth; the power system provides a power source for the transmission mechanism connected with the power source, the transmission mechanism converts the linear reciprocating motion generated by the power source into the circular motion of the inner teeth, the continuous vibration of the inner teeth and the outer teeth is realized, and the power system receives a control signal of the control module to control the torsional vibration frequency, the torsional vibration amplitude and the load amplitude generated by the control module.
5. The equivalent dead load simulation loading test system of friction plate tooth of claim 4, wherein said power system comprises an electromagnetic exciter and a bracket; the exciting force of the electromagnetic vibration exciter is 0-10000N adjustable; the frequency is adjustable between 0Hz and 200 Hz; the amplitude is adjustable from 0 mm to 20 mm; the loading and testing under different working conditions are realized by utilizing the adjustability of the parameters of the electromagnetic vibration exciter, and the electromagnetic system provides power for the electromagnetic vibration exciter.
6. the equivalent dead load simulation loading test system of friction plate tooth of claim 5, wherein said drive mechanism comprises a drive rod, a rocker arm and a hub; one end of the transmission rod is movably connected with the output end of the electromagnetic vibration exciter, the other end of the transmission rod is movably connected with one end of the rocker arm, the other end of the rocker arm is movably connected with a shaft disc fixed on the protection box, and the inner teeth are fixedly connected with one end, corresponding to the shaft disc, of the rocker arm.
7. the equivalent dead load simulation loading test system of friction disc tooth of claim 6, characterized in that, installation stop gear includes solid fixed ring and fender ring, have an annular step that holds the external tooth on solid fixed ring's the anchor ring, the external tooth is installed and will keep off the ring and fix on solid fixed ring after the annular step again, keep off the ring and restrict the external tooth in annular step, the radial displacement of external tooth has little clearance when restricting and guarantees its free vibration, the external tooth still has along solid fixed ring axis pivoted degree of freedom.
8. The equivalent dead load simulation loading test system of friction plate tooth of claim 7, characterized in that, the external tooth adopts complete friction plate or divides into multistage sample, and the multistage sample of dividing into can realize the simultaneous test of a plurality of samples.
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| CN111289555A (en) * | 2020-03-27 | 2020-06-16 | 中国北方车辆研究所 | Full-field test method for thermal fatigue load of friction plate |
| CN114323636A (en) * | 2021-12-29 | 2022-04-12 | 中汽检测技术有限公司 | Monitoring method and device for gear fatigue test, electronic equipment and storage medium |
| CN116481797A (en) * | 2023-04-17 | 2023-07-25 | 中国北方车辆研究所 | Friction and torsional vibration coupling working condition test system and method for gear shifting control element |
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| CN116481797A (en) * | 2023-04-17 | 2023-07-25 | 中国北方车辆研究所 | Friction and torsional vibration coupling working condition test system and method for gear shifting control element |
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