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Vehicle frame assembly torsion fatigue loading test stand and test method

A torsional fatigue and loading test technology, which is applied in vehicle suspension/shock absorbing mechanism testing, mechanical component testing, machine/structural component testing, etc., can solve inaccurate torsional performance testing and inaccurate road load relationship of vehicle frame assembly Clarify issues such as frame freedom and over-constraints to improve the significance of the test and facilitate lightweight verification

Active Publication Date: 2017-12-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, the torsional fatigue loading test bench of the heavy-duty vehicle frame assembly has the condition of excessive freedom of the frame, which leads to the problem of inaccurate torsional performance testing
[0005] At this stage, the fatigue strength assessment of heavy-duty vehicle frame assemblies mostly adopts the constant-amplitude torsion angle loading method. The source of the torsion angle in this method is artificially defined. The relationship between this loading method and the road load of the frame assembly is not clear and cannot truly reflect It is difficult to obtain the real torsional fatigue life of the actual stress of the frame assembly on the road, and there is a big difference between the assessment of the frame assembly and the actual situation

Method used

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  • Vehicle frame assembly torsion fatigue loading test stand and test method
  • Vehicle frame assembly torsion fatigue loading test stand and test method
  • Vehicle frame assembly torsion fatigue loading test stand and test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The following is an example of converting the torsion signal of the 1# commercial vehicle frame into a load spectrum.

[0060] 1. Rainflow Statistics

[0061] The frame torsion angle signal is counted, Range is divided into 8 levels, and the 1# commercial vehicle characteristic 3-way frame torsion angle matrix statistics are shown in the following table:

[0062] Table 1. Statistical table of torsion angle of 1# commercial vehicle characteristics 3-way frame

[0063]

[0064] 2. Use the Miner fatigue cumulative damage theory to calculate the relative damage of the above rainflow matrix, and use the Goodman (Goodman) average stress correction formula to correct the damage corresponding to each level of load.

[0065] Miner fatigue cumulative damage theory formula is as follows:

[0066]

[0067] In the above formula, D is the total damage, is the i-th degree of damage, is the actual number of cycles under the i-th stress level, is the life under the i-th ...

Embodiment 2

[0080] The following is an example of converting the torsion signal of the 2# commercial vehicle frame into a load spectrum.

[0081] 1. Rainflow Statistics

[0082] Table 1. Statistical table of torsion angle of 2# commercial vehicle characteristics 3-way frame

[0083]

[0084] 2. Use the above rainflow matrix to calculate relative damage, and use Goodman's average stress correction formula to correct the damage corresponding to all levels of load.

[0085] Table 2. Statistical table of relative damage after 3-way correction of 2# commercial vehicle characteristics

[0086]

[0087] 3. Relative damage equivalent control test cycle times

[0088] Table 3. 2# commercial vehicle characteristic 3-way 4-level torsion angle amplitude and cycle count statistical table

[0089]

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Abstract

The invention relates to a vehicle frame assembly torsion fatigue loading test stand. The test stand is characterized in that a vehicle frame assembly is of a rectangular frame structure, and the back end of the vehicle frame assembly is connected with a second combination support through a connecting rod with a joint bearing; and an end head of a connecting rod of a first combination support is connected with a vehicle frame fixing plate, a third combination support is positioned on the right side of the vehicle frame assembly, a front clamp plate and a rear clamp plate are fixedly connected on the left side and the right side of the front bottom surface of the vehicle frame assembly, square steel is connected between the front clamp plate and the rear clamp plate, and a middle clamp plate is fixedly connected to the square steel. The test stand can reflect the using characteristics of a vehicle frame and the torsion loading spectrum of a test of a test site more really, so the test precision is higher than that of a human defined loading spectrum test. Meanwhile, the number of circulation is controlled through equivalent damage to enable comparison between a test of the test stand and an endurance test of the test site, the meaning of the tests is improved, and lightweighting verification of the vehicle frame is facilitated.

Description

technical field [0001] The invention relates to a vehicle frame assembly torsional fatigue loading test bench and a test method, belonging to the technical field of automobile product testing. Background technique [0002] At present, vehicles are widely used in people's daily life, and people pay more and more attention to the quality of vehicles. The frame is the core component of the vehicle, and the quality and performance of the frame directly affect the performance of the entire vehicle. Among them, the torsional fatigue strength of the frame is a key indicator for assessing the quality of the frame. Therefore, it is necessary to test and verify the torsional fatigue strength of the frame during the development of the frame. [0003] In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art: [0004] At present, the torsional fatigue loading test bench of the heavy-duty vehicle frame assembl...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01M17/04
CPCG01M13/00G01M17/04Y02T90/00
Inventor 廖亮亮杨立峰赵强徐佳彬曹正林卢炳武
Owner CHINA FIRST AUTOMOBILE
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