Engine hood vibration optimization design method

Abstract

The invention discloses an engine hood vibration optimization design method. The method comprises the steps: analyzing a VTF transfer function of an engine hood of a benchmarking vehicle model throughsimulation; establishing a finite element model by using product data, and defining an excitation point and a response point; carrying out VTF transfer function analysis by Nastran software; determining whether the engine hood transfer function value meets the requirement or not according to a simulation result; by optimizing a vibration position product structure, improving the rigidity of the engine hood so that a VTF transfer function meets a target value. The vibration problem of the engine hood is solved from the NVH transfer function analysis direction, the vibration transfer function is adopted, optimization analysis is conducted on the engine hood, output is set at the high-sensitivity position of the engine hood, the product transfer function value is calculated through simulation, the result meets the target value, and the vibration quantity of the engine hood can be effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of engine cover design, and in particular relates to a method for reducing vibration generated by an engine cover of a passenger vehicle. Background technique [0002] Vibration is often generated during the starting and driving of the vehicle, and it is necessary to optimize the vibration generated during the starting and driving of the vehicle. However, at present, vibration is mainly based on experiments and subjective evaluation. However, the vibration test is carried out in the experimental stage. At this time, the vehicle has entered the prototype stage. If the vibration test is carried out at this stage, if problems are found and then optimized, the cost is high, and it is difficult to find the cause. [0003] Therefore, it is necessary to advance the vibration optimization to the vehicle design stage. If the correct simulation calculation is performed, the location of the vibration can be objectively...

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Problems solved by technology

[0005] In order to solve the problems that the vehicle vibration in the prior art is mainly based on experiments and subjective evaluation. At this time, the vehicle has entered the prototype stage. If the vibration test is carried out at this stage, the problem is found and then optimized, the cost is high, and it is difficult to find the cause. The present invention Provide an engine cover vibration optimization design method, solve the engine cover vibration problem from the direction of NVH transfer function analysis, use the vibration transfer function to optimize the analysis of the engine cover, set the output at the position where the sensitivity of the engine cover is high, and calculate through simulation The value of the product transfer function, so that the result meets the target value, can effectively control the vibration of the engine cover

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