A helicopter engine case vibration reduction method based on vibration energy flow control

By constructing a finite element model and adjusting the engine attachment point position, the problem of uneven distribution of vibration energy flow in the helicopter engine casing was solved, the visualization and distribution control of the casing vibration energy flow was achieved, structural damage was avoided, and the vibration reduction effect was improved.

CN119647170BActive Publication Date: 2025-10-03HARBIN ENG UNIV
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Patent Information

Application Number
CN202411672344.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-21
Publication Date
2025-10-03
Estimated Expiration
2044-11-21

AI Technical Summary

Technical Problem

Existing technologies have limited effects on reducing vibration in helicopter engine casings and fail to effectively control the distribution of vibration energy in the casing structure, resulting in excessive concentration of vibration energy flow in certain parts and damaging the structure.

Method used

By constructing a finite element model, applying excitation loads for steady-state dynamic analysis, calculating the vibration energy flow components and vectors, and adjusting the engine attachment point position to eliminate the concentrated area of ​​vibration energy flow, the visualization and distribution control of the casing vibration energy flow can be achieved.

Benefits of technology

It achieves accurate analysis and visualization of the vibration energy flow of the casing, avoids structural damage caused by excessive concentration of vibration energy flow, optimizes the vibration reduction effect, and has important theoretical and engineering value.

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Abstract

A method for reducing vibration of a helicopter engine casing based on vibration energy flow control belongs to the technical field of structural dynamic response vibration reduction analysis. The purpose of the present invention is to solve the problem of poor vibration reduction effect of helicopter engine casings in existing methods. The present invention first constructs and corrects a finite element model of the helicopter engine casing, then calculates the vibration energy flow components and their vectors at each position on the casing surface to obtain the amplitude of the vibration energy flow at each position on the casing, draws a three-dimensional graph of the vibration energy flow based on the vibration energy flow amplitude, and realizes visualization of the distribution of the vibration energy flow in the casing structure. It can accurately analyze the concentrated area of ​​the vibration energy flow in the casing, and finally adjust the engine hanging point position according to the distribution of the vibration energy flow to reduce the amplitude of the vibration energy flow in the specific area, thereby reducing the vibration amplitude and improving the effect of casing vibration reduction. The method of the present invention can be applied to helicopter engine casing vibration reduction.
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