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Exhaust system hanging position optimizing method based on mode superposition

A technology of exhaust system and optimization method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems affecting the smooth performance of the whole vehicle, and achieve the effect of predicting the impact

Inactive Publication Date: 2015-03-25
JIANGLING MOTORS
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Problems solved by technology

The vibration of the exhaust system will cause the vibration of the body floor through the hook and the lifting lug, which will seriously affect the smoothness of the vehicle

Method used

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  • Exhaust system hanging position optimizing method based on mode superposition
  • Exhaust system hanging position optimizing method based on mode superposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] Example: see figure 1 .

[0013] 1) Establish a finite element model of the exhaust system for free modal analysis;

[0014] 2) On the finite element model, a part of potential exhaust system suspension nodes is initially selected, and the modal displacement of the nodes is weighted and superimposed;

[0015] 3) According to the weighted displacement of each potential node, combined with various factors such as layout, determine the hanging position of the exhaust system;

[0016] 4) According to the determined hanging position of the exhaust system, conduct a sensitivity analysis of the exhaust system to verify the rationality of the hanging position selection.

[0017] The weighted displacement summation calculation method is as follows, assuming a single point excitation, by the multi-degree-of-freedom system modal analysis theory, the frequency response function between the response point l and the excitation point p is: in, is the lth measuring point, the rth...

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Abstract

The invention relates to the field of exhaust system design, in particular to an exhaust system hanging position optimizing method based on mode superposition. The method comprises the steps of firstly, calculating the mode of an exhaust system and learning the vibration performance of each order mode; secondly, numbering the potential positions of a hook consecutively from the hot end to cold end of an exhaust pipe shaft; thirdly, conducting weighted displacement summation on each order mode to obtain the weighted vibration mode indication displacement of each potential hanging position, and taking the position with small weighted vibration mode indication displacement as a final potential hanging position; finally, conducting sensitivity analysis on the hanging position of the exhaust system to further verify the reasonability of the hanging position based on the preliminarily selected exhaust system hanging position. According to the method, optimal selection of the hanging position of a lifting lug can be achieved at the earlier stage of complete vehicle development, and complete vehicle ride comfort matching design is guided. By the adoption of the exhaust system CAE analysis technical method adopting mode superposition, the influence of the position of the hook on NVH of a complete vehicle can be effectively predicted.

Description

technical field [0001] The invention relates to the field of exhaust system design, in particular to a method for optimizing the hanging position of the exhaust system based on the mode superposition method. Background technique [0002] With the development of society and the advancement of technology, people have higher and higher requirements for modern cars. Cars that are compact, spacious and comfortable, and have good NVH performance are generally welcomed. As one of the main factors affecting the ride comfort of automobiles, the vibration problem of automobile exhaust system has been widely paid attention to. The automobile exhaust system is generally connected to the engine exhaust manifold and the body floor through flanges and lifting lugs. Due to the influence of the vibration of the engine itself and the excitation of the exhaust, the vibration of the exhaust pipe is relatively large. The vibration of the exhaust system will cause the vibration of the body flo...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 邓磊段龙扬余显忠黄晖邱星
Owner JIANGLING MOTORS
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