Automotive Panel Vibration Analysis via Frame Thickness Optimization
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Solution Overview
Problem
Existing techniques for reducing vibration noise in automotive panel parts are inefficient as they either fail to block vibrations in all transmission paths or increase the weight and interfere with other parts, making it difficult to achieve significant noise reduction without altering the frame's shape or weight.
Innovation Solution
A method involving sheet thickness optimization of vibration transmission frame parts using subdivided meshes and equivalent radiated power as an objective function, with the goal of minimizing vibration noise while maintaining the frame's original weight and shape, by specifying and optimizing the sheet thickness of key frame parts in the vibration transmission path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bead is formed in the panel part to reduce vibration noise, then vibration noise is reduced, but the bead interferes with adjacent inner panel parts and is difficult to apply to outer panel parts
Solution Approach 1:
The invention introduces frame parts as intermediary elements in the vibration transmission path. Instead of directly modifying the panel part with beads, the vibration is blocked by modifying frame parts that transmit vibration to the panel, thereby achieving noise reduction without interfering with panel part assembly or appearance
Solution Approach 2:
The invention extracts the vibration noise reduction measure from the panel part itself and relocates it to the frame parts in the vibration transmission path. This separation allows the panel part to maintain its original design while the frame parts are modified to block vibration transmission
2Object-affected harmful factors
If a bead is formed in the frame part to block vibration transmission, then vibration is blocked in specific modes, but vibrations in other transmission paths and modes cannot be blocked
Solution Approach 1:
The invention segments the frame part into multiple regions based on vibration energy analysis results. By dividing the frame part and applying thickness modifications to specific segmented regions rather than a single location, the solution covers multiple vibration transmission paths and modes simultaneously
Solution Approach 2:
The invention applies different sheet thicknesses to different local regions of the frame part based on their contribution to vibration transmission. Regions with higher vibration energy receive greater thickness modifications, while other regions maintain original dimensions, creating a localized quality distribution that addresses multiple vibration paths
3Object-affected harmful factors
If the widths of center portions of roof bows are increased to suppress vibrations, then vibration noise is reduced, but the weight is significantly increased and the frame part interferes with other parts
Solution Approach 1:
The invention applies sheet thickness modifications only to specific local regions of the frame part identified through vibration energy analysis, rather than uniformly increasing the dimensions of entire components. This localized approach reduces vibration noise while minimizing weight increase and avoiding interference with other parts
Solution Approach 2:
The invention changes the sheet thickness parameter of the frame part in specific regions rather than altering the overall dimensions or shape of the frame part. This parameter change approach effectively suppresses vibrations while maintaining the original weight and geometric constraints
Data Source
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AI summary
A vibration noise reduction analysis method for automotive panel parts according to the present invention acquires an automotive body mesh model including a vibration noise reduction target panel part model and vibration transmission frame part models, and in which an exciter is set (S1), selects a specific frequency band of the vibration noise reduction target panel part model (S3), specifies a vibration transmission frame part model that greatly contributes to vibration noise in the vibration noise reduction target panel part model (S5), optimizes a sheet thickness of each mesh of the specified vibration transmission frame part model (S7), sets divided areas in the specified vibration transmission frame part model based on the sheet thickness optimized for each mesh (S9), optimizes a sheet thickness of each divided area (S11), and determines divided areas of a vibration transmission frame part and their optimal sheet thicknesses based on the sheet thickness optimized for each divided area (S13).