CN-122020890-A - Gear squeal evaluation method and system based on contact spot unbalanced load quantification

CN122020890ACN 122020890 ACN122020890 ACN 122020890ACN-122020890-A

Abstract

The invention discloses a gear squeal evaluation method and a system based on contact spot unbalanced load quantification, and relates to the technical field of gear transmission NVH performance evaluation. The invention aims to solve the problems of strong subjectivity, inaccurate quantification and separation from actual perception of a user in the conventional gear squeal evaluation method. The method comprises the steps of obtaining tooth surface contact characteristic data of a gear pair under a plurality of load working conditions, dividing the working conditions into intervals according to howling sensitivity, distributing different weights, calculating quantitative unbalanced load parameters representing contact spot position deviation and form divergence according to the working conditions, integrating the quantitative unbalanced load parameters into Shan Gongkuang load deviation measures, and finally carrying out weighted aggregation on the deviation measures of the working conditions to obtain a comprehensive performance evaluation index. According to the invention, a set of evaluation system of quantitative unbalanced load and sensitivity weighting is established, so that objective, accurate and practical evaluation of gear squeal performance is realized, and the evaluation efficiency and the accuracy of optimization guidance are remarkably improved.

Inventors

Zhang Feibing
ZOU WENBO
QIAO MENG
XU KUN
HE YI
HAN TAO
LI XINCHENG

Assignees

智新科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260121

Claims (10)

1. The gear squeal evaluation method based on the contact spot unbalanced load quantification is characterized by comprising the following steps of: acquiring tooth surface contact characteristic data of a gear pair under a plurality of preset load working conditions; Determining howling sensitivity levels respectively corresponding to the plurality of preset load working conditions; respectively setting weight coefficients for the plurality of preset load working conditions, wherein the set weight coefficients are larger than the weight coefficients of the load working conditions corresponding to the lower howling sensitivity level, and the load working conditions corresponding to the higher howling sensitivity level; aiming at each load working condition, calculating to obtain a single-working-condition load offset measurement representing the load offset degree of the tooth surface under the working condition based on the tooth surface contact characteristic data and a preset effective contact area; And carrying out weighted summation calculation based on the single-working-condition load offset measurement of each load working condition and the weight coefficient corresponding to the single-working-condition load offset measurement to obtain an evaluation index representing the howling comprehensive performance of the gear pair.
2. The method of claim 1, wherein the step of calculating the single-condition load offset metric comprises: determining the actual geometric center coordinates and the total area of the contact spots based on the tooth surface contact characteristic data; Determining a reference geometric center coordinate of the effective contact area based on the effective contact area; and calculating an offset load quantification parameter of the contact spot in at least one dimension, wherein the offset load quantification parameter comprises an offset parameter representing the degree of the actual geometric center coordinate deviating from the reference geometric center coordinate and a divergence parameter representing the focusing degree of the contact spot in the effective contact area.
3. The method according to claim 2, wherein the offset parameter includes a left-right offset Δw in the tooth width direction and a up-down offset Δh in the tooth height direction, and the divergence parameter is a divergence Δd calculated by: Wherein i is a working condition serial number, W i and H i are coordinates of an actual geometric center of a contact spot in a tooth width and tooth height direction under an ith working condition respectively, W 0 and H 0 are coordinates of a reference geometric center of the effective contact area in the tooth width and tooth height direction respectively, W and H are widths and heights of the effective contact area respectively, A in_i is an area of the contact spot in the effective contact area under the ith working condition, and A total_i is a total area of the contact spot under the ith working condition.
4. A method according to claim 3, wherein the single-condition load offset metric Δp i is obtained by linearly weighted summing the offset quantization parameters: Wherein, alpha, beta and gamma are preset sub-term weight coefficients of each unbalanced load quantization parameter.
5. The method of claim 4, wherein the fractional weight coefficients satisfy α+β+γ=1, and γ > α, γ > β.
6. The method of claim 1, wherein the operating range comprises a low load sensitive region, a medium load less sensitive region, and a high load less sensitive region; the sum of the weight coefficients allocated to all the working conditions in the sensitive area is larger than the sum of the weight coefficients allocated to all the working conditions in the secondary sensitive area, and is larger than the sum of the weight coefficients allocated to all the working conditions in the non-sensitive area.
7. The method of claim 6, wherein the sensitive zone is a 0-20Nm torque interval, the secondary sensitive zone is a 20-100Nm torque interval, and the non-sensitive zone is a torque interval greater than 100 Nm.
8. A gear squeal evaluation system based on contact patch offset load quantification, comprising: The data acquisition module is used for acquiring tooth surface contact characteristic data of a gear pair under a plurality of preset load working conditions; The parameter calculation module is connected with the data acquisition module and is used for calculating and obtaining a single-condition load offset measurement representing the load offset degree of the tooth surface under each load working condition based on the tooth surface contact characteristic data and a preset effective contact area; The weight processing module is used for dividing the preset load working conditions into at least two working condition intervals with different howling sensitivity levels, and respectively setting weight coefficients for the preset load working conditions, wherein the corresponding weight coefficients of the load working conditions belonging to the working condition interval with higher howling sensitivity level are larger than the weight coefficients of the load working conditions belonging to the working condition interval with lower howling sensitivity level; And the index generation module is connected with the parameter calculation module and the weight processing module and is used for carrying out weighted set operation based on the single-working-condition load offset measurement of each load working condition and the weight coefficient corresponding to the single-working-condition load offset measurement to obtain an evaluation index for representing the howling comprehensive performance of the gear pair.
9. The system of claim 8, wherein the parameter calculation module is specifically configured to: determining the actual geometric center coordinates and the total area of the contact spots based on the tooth surface contact characteristic data; Determining a reference geometric center coordinate of the effective contact area based on the effective contact area; and calculating an offset load quantification parameter of the contact spot in at least one dimension, wherein the offset load quantification parameter comprises an offset parameter representing the degree of the actual geometric center coordinate deviating from the reference geometric center coordinate and a divergence parameter representing the focusing degree of the contact spot in the effective contact area.
10. The system of claim 9, wherein the parameter calculation module is configured to calculate the offset parameter and the divergence parameter according to the following formulas: Wherein i is a working condition serial number, W i and H i are coordinates of an actual geometric center of a contact spot in a tooth width and tooth height direction under an ith working condition respectively, W 0 and H 0 are coordinates of a reference geometric center of the effective contact area in the tooth width and tooth height direction respectively, W and H are widths and heights of the effective contact area respectively, A in_i is an area of the contact spot in the effective contact area under the ith working condition, and A total_i is a total area of the contact spot under the ith working condition.

Description

Gear squeal evaluation method and system based on contact spot unbalanced load quantification Technical Field The invention relates to the technical field of NVH (noise, vibration and harshness) performance evaluation of a gear transmission system, in particular to a gear squeal noise evaluation method and system based on tooth surface contact spot unbalanced load quantification. Background Gear rattle noise is one of the key challenges in the NVH performance of drive trains for vehicles, industrial equipment, etc., and is essentially caused by periodic vibrations induced by tooth contact excitation transmitted through the drive path during gear pair engagement. Especially under the low-speed and medium-torque working conditions with weak background noise, squeal noise is particularly prominent, and subjective driving comfort of a user or use experience of equipment is seriously affected. Therefore, accurate and objective evaluation of gear squeal performance is a key link for guiding gear design optimization and improving NVH performance of products. Currently, gear squeal evaluation methods in the mainstream in the industry mainly include two types: The first is an evaluation method based on the transfer error (Transmission Error, TE). The method takes the theory that the smaller the transmission error is, the weaker the tooth surface impact excitation is, and the lower the howling risk is as the theoretical basis. However, in engineering practice, the method has the remarkable defects of 1) high modeling accuracy dependence and large deviation from reality. The accurate calculation of the transmission error needs to accurately model a plurality of parameters such as gear contact rigidity, assembly clearance, shafting deformation, machining error and the like, and complex factors such as gear machining error (such as tooth shape and tooth direction deviation), assembly tolerance (such as bearing clearance) and the like in actual production are difficult to completely and accurately incorporate into a simulation model, so that the transmission error calculated in theory often has obvious deviation with the actual measurement result of the whole vehicle or equipment. 2) The effect of local unbalanced loading cannot be reflected. The transmission error only evaluates the meshing performance from the macroscopic motion precision level, but ignores the key influence of the local unbalanced load state of the tooth surface contact spots (such as the position deviation and the form divergence of the contact spots) on the squeal. Even if macroscopic transmission errors reach the standard, if the tooth surface contact spots have serious local unbalanced load, strong vibration and squeal noise can be caused by local stress concentration. The second category is qualitative assessment methods based on contact patch morphology. In order to make up for the deficiency of the transmission error method, the industry gradually adopts 'contact spot morphology contrast' as an auxiliary evaluation means. The method is generally carried out by acquiring a speckle image through simulation software (such as MASTEA and ROMAX) or physical test (such as tooth surface painting method), and judging by engineers empirically. However, the method is remained on a qualitative level, lacks a unified quantification standard, and has the defects of 1) strong subjectivity and poor consistency in evaluation. The "unbalanced load degree" judgment of the same spot image by different engineers may be quite different, resulting in unstable evaluation results and irreproducibility. 2) Partial load characteristics are not completely depicted. The method only focuses on whether the spot is centered or not, but can not quantify key characteristics such as specific offset distance, focusing or diverging degree of the spot (namely loss of effective meshing area) and the like, and can not accurately and comprehensively evaluate the characteristics of the contact spot. 3) The weight of the working condition is lost, and the optimization pertinence is poor. The method generally adopts an equalization evaluation mode, and is equally regarded as the speckle performance of a sensitive medium-torque working condition and a insensitive large-torque working condition of a user, which often results in the embarrassing situation that the optimized gear meets the standard under the large-torque working condition, but the medium-torque squeal exceeds the standard. In summary, the prior art lacks a gear squeal evaluation method capable of quantifying the full-dimension unbalanced load characteristic of the contact spots and distributing weights in combination with the working condition sensitivity, so that objective and accurate evaluation is realized, which results in long development period of the NVH performance of the gear and low optimization success rate, and technical breakthrough is needed urgently. Disclosure of Invention Aiming at the technical problems of