A calculation and analysis method for the 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 when a vehicle is working, comprising the following steps: S1, carrying out finite element modeling of the entire vehicle and performing modal simulation calculation; S2, obtaining vehicle vibration excitation through experimental tests System information; S3, import the data obtained in step S2 into the finite element analysis software; S4, solve the calculation under the combined action of the three directions of each vibration excitation system, the three directions of each vibration excitation system alone, and all The frequency response function when the three directions of the vibration excitation system act together; S5, export the data calculated by the finite element analysis software and import it into the numerical calculation software; S6, calculate each vibration at the problem point during the driving process of the car The contribution of the excitation system and the contribution of each vibration excitation system in each direction. The contribution results obtained by this calculation and analysis method are accurate, and can provide a reliable basis for the improved design of automobiles.

Description

technical field [0001] The invention relates to the technical field of vehicle vibration calculation, in particular to a method for calculating and analyzing the contribution of each vibration excitation system when the vehicle is working. Background technique [0002] In modern body design, interior acoustic comfort has become one of the important design indicators, and it is also one of the vehicle performance indicators that users care about. A car is a system composed of excitation source (engine, transmission, exhaust system, etc.), vibration transmitter (composed of suspension system and connecting parts) and noise emitter (body). NVH technology mainly controls vehicle noise by controlling noise sources and noise propagation paths. 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 car rides and the noise level in the car. Therefore, the reduction ...

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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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