CN-121994465-A - Test optimization method of shimmy damper

CN121994465ACN 121994465 ACN121994465 ACN 121994465ACN-121994465-A

Abstract

The invention discloses a test optimization method of a shimmy damper, which is used for simulating the working state of the shimmy damper, respectively obtaining test results of a damping performance test, a high-frequency fatigue test, a sealing performance test and a running-in test of the shimmy damper, and determining X, Y-direction linear stiffness and Z-direction torsional stiffness. And acquiring each parameter variable affecting the performance of the shimmy damper, acquiring corresponding test performance, and determining key parameter variables based on a random forest model. And predicting the performance of the shimmy damper based on the key parameter variable, and obtaining the optimal key parameter combination through a genetic algorithm based on the error of the predicted performance of the shimmy damper and the actual test performance, the constraint condition and the optimization target. The invention can realize the performance prediction and correction of the shimmy damper at the beginning of design, shortens the design period and has better practicability.

Inventors

ZHANG ZHENJIAN
TAN JIUQIANG
SHAN PENG
PAN SONG
HE CHAO
LIU MING

Assignees

四川凌峰航空液压机械有限公司

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (6)

1. A method of testing and optimizing a shimmy damper, comprising the steps of: step S1, building a test tool of the shimmy damper, simulating the actual working state of the shimmy damper, and finishing moment detection; Step S2, simulating the working state of the shimmy damper, testing the shimmy damping characteristic of the shimmy damper in a vibration state, and respectively obtaining test results of a damping performance test, a high-frequency fatigue test, a sealing performance test and a running-in test of the shimmy damper according to a relationship curve between the shimmy damping and impact load of the simulated shimmy damper; Step S3, collecting various parameter variables affecting the performance of the shimmy damper, and repeating the step S1 and the step S2 to obtain the test performance of different parameter variables; and S4, predicting the performance of the shimmy damper based on the key parameter variable, and obtaining the optimal key parameter combination through a genetic algorithm based on the error of the predicted performance of the shimmy damper and the actual test performance, the constraint condition and the optimization target.
2. The test optimization method of the shimmy damper according to claim 1, wherein in the step S1, the test fixture of the shimmy damper comprises a bottom plate and a swinging cylinder support, wherein the bottom plate and the swinging cylinder support are sequentially arranged on a test stand from front to back, an installation tail seat and a supporting seat are sequentially arranged on the bottom plate in a sliding mode from front to back and are fixedly locked through a locking mechanism, the swinging cylinder support is provided with a swinging cylinder, an output main shaft of the swinging cylinder is connected with a torque sensor through a flange plate, the installation tail seat is used for installing a gear ring and the shimmy damper, a supporting seat is arranged between the output main shaft of the swinging cylinder and the gear ring, the supporting seat is used for guaranteeing stability when the gear ring rotates, a central shaft is arranged in the supporting seat in a rotating mode, one end of the central shaft is connected with the torque sensor, and the other end of the central shaft is connected with a driving plate for rotating the gear ring.
3. The method according to claim 1 or 2, wherein in step S2, sinusoidal excitation is applied to the damper on a hydraulic or electromagnetic vibration table with sufficient thrust, damping moment and angular displacement are measured, and a graph of the dynamic damping coefficient is calculated.
4. A method for optimizing a test of a shimmy damper according to claim 3, wherein in the step S2, the test frequency is 15Hz for heavy bombers and conveyors, 20Hz for fighters and mini-planes, and the test amplitude is ±1° to ±6°.
5. The method for testing and optimizing a swing reducer according to claim 3, wherein the step S1 and the step S2 simulate the actual working state of the swing reducer, and perform a starting moment detection, a damping performance test, a high-frequency fatigue test, a sealing performance test and a running-in test of the swing reducer to check the performance and reliability of the swing reducer.
6. The method according to claim 1, wherein in the step S3, the parameter variables include structural parameters of the shimmy damper, torsional damping, and tire pressure, and the key parameter variables include torsional damping and tire pressure.

Description

Test optimization method of shimmy damper Technical Field The invention belongs to the technical field of test optimization of a shimmy damper, and particularly relates to a test optimization method of a shimmy damper. Background With the continuous development of the aviation industry in China, the quality requirements of aviation products are also continuously improved, and new challenges are provided for product tests. The development of product diversity makes the design and manufacture of test equipment more complex, the stability of test equipment is one of the decisive factors related to the accuracy of product performance indexes, and the design of test equipment according to the product performance requirements has become an urgent need to be solved. For example, shimmy reducers are used to prevent shimmy of the front wheels of an aircraft while the aircraft is moving on the ground. Because the front wheel of the aircraft can deflect left and right, and the landing gear with a metal structure is an elastic body, the landing gear receives the action of ground friction force, if the aircraft encounters interference in linear running, and the front wheel deviates from the original movement direction, the landing gear is likely to generate the phenomenon of left and right deflection and oscillation taking the original movement direction as an axis under the alternating action of the ground friction force and the self elastic force. If the aircraft is at a low running speed, the oscillations can converge themselves without serious consequences. However, if the speed of the aircraft increases to a certain value, the oscillation is in a divergent trend, the amplitude is larger and larger, so that the abrasion of the aircraft wheel is aggravated, the running direction is difficult to control, the reading of the cockpit instrument is unclear, and the landing gear structure can be damaged when serious, so that the flight safety is endangered. To prevent shimmy, almost all aircraft have a shimmy damper mounted on the nose landing gear as part of the nose wheel steering system. With the high-speed development of the aviation manufacturing industry in China, products are developed towards diversification, and verification of performance indexes such as stability and durability of the products is an indispensable verification process for product delivery. The shimmy damper test bed is an important factor of product tests, each shimmy damper set needs to perform various performance tests (such as anti-shimmy damping, steering angle, starting moment inspection, high-low temperature test, running-in test and the like) according to design requirements, and in order to verify the correctness of theory, test variables are controlled according to the installation requirements of the products, and test results are observed, so that designing a corresponding test bed becomes a serious problem in the tests. Disclosure of Invention The invention aims to provide a test optimization method of a shimmy damper, which aims to solve the problems. The invention is realized mainly by the following technical scheme: a test optimization method of a shimmy damper comprises the following steps: step S1, building a test tool of the shimmy damper, simulating the actual working state of the shimmy damper, and finishing moment detection; Step S2, simulating the working state of the shimmy damper, testing the shimmy damping characteristic of the shimmy damper in a vibration state, and respectively obtaining test results of a damping performance test, a high-frequency fatigue test, a sealing performance test and a running-in test of the shimmy damper according to a relationship curve between the shimmy damping and impact load of the simulated shimmy damper; Step S3, collecting various parameter variables affecting the performance of the shimmy damper, and repeating the step S1 and the step S2 to obtain the test performance of different parameter variables; and S4, predicting test performance based on the key parameter variables, and obtaining the optimal key parameter combination through a genetic algorithm based on errors of the predicted test performance and the actual test performance, constraint conditions and optimization targets. In order to better realize the invention, in the step S1, the test fixture of the shimmy damper comprises a bottom plate and a swinging cylinder support, wherein the bottom plate and the swinging cylinder support are sequentially arranged on a test bed from front to back, an installation tailstock and a supporting seat are sequentially arranged on the bottom plate in a sliding manner from front to back and are fixedly locked through a locking mechanism, a swinging cylinder is arranged on the swinging cylinder support, an output main shaft of the swinging cylinder is connected with a torque sensor through a flange plate, the installation tailstock is used for installing a gear ring and the shimmy damper, a sup