Method for calculating and analyzing contribution of each vibration excitation system during vehicle operation

Abstract

The invention discloses a method for calculating and analyzing the contribution of each vibration excitation system during vehicle operation. The method comprises the following steps of (S1) performing finite element modeling on a complete vehicle and performing modal simulation calculation, (S2) obtaining the information of a vehicle vibration excitation system through a test, (S3) importing dataobtained in the step (S2) into finite element analysis software, (S4) solving and calculating frequency response functions under the combined action of three directions of each vibration excitation system, the single action of the three directions of each vibration excitation system and the combined action of three directions of all vibration excitation systems, (S5) exporting data calculated bythe finite element analysis software and importing the data into numerical calculation software, and (S6) calculating the contribution of each vibration excitation system at a problem point and the contribution of each direction of each vibration excitation system during a vehicle running process. A contribution result obtained by the calculation and analysis method is accurate, and a reliable basis can be provided for the improved design of the vehicle.

Description

technical field [0001] The invention relates to the technical field of automobile vibration calculation, in particular to a method for calculating and analyzing the contribution of each vibration excitation system when the vehicle is in operation. Background technique [0002] In modern body design, interior acoustic comfort has become one of the important design indicators, and also one of the vehicle performance indicators that users care about. A car is a system consisting of an excitation source (engine, transmission, exhaust system, etc.), a vibration transmitter (composed of suspension systems and connections), and a noise emitter (body). NVH technology mainly controls the noise of the vehicle through the control of noise sources and noise transmission channels. With the rapid development of electronic technology and the continuous innovation of the automobile industry, people have higher and higher requirements for the comfort of the car and the noise level inside ...

AI Technical Summary

Problems solved by technology

[0004] (1) During the test analysis of the contribution of the exhaust system, if any hook connection is removed, the installation posture of the exhaust will change, resulting in different stress conditions for other hooks, and it is impossible for the hooks of this system to take off completely;

[0005] (2) When conducting the test and analysis of the contribution of the engine mount system, any mount cannot be removed, so that the contribution obtained from the test can only be a qualitative result and cannot be analyzed quantitatively;

[0006] (3) When carrying out the test and analysis of the necessary system contribution of the water tank and other vehicles, it cannot be removed, so the contribution obtained from the test can only be a qualitative result and cannot be analyzed quantitatively;

[0007] (4) The method of obtaining the contribution of the incentive system is basically by means of experiments. This method is costly, time-consuming, and the results are not very accurate

[0008] To sum up, the methods used in the prior art to obtain the contribution of each system when the vehicle is working have the following problems: (1) The contribution of each excitation system when it is installed separately in a certain direction is not obtained; (2) The contribution of each excitation system is not obtained; Obtain the contribution of each mount of the engine when it is installed and working alone; (3) The excitation load measured after the exhaust vibration shielding is not consistent with the real load in the original state

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