Automotive Body Vibration Optimization via 3D Topology Analysis
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Solution Overview
Problem
Current methods fail to simultaneously improve dynamic stiffness and reduce weight of automotive body parts, as increasing stiffness often leads to increased mass, contradicting the goal of achieving high-frequency vibration performance and preventing resonance with engine vibrations.
Innovation Solution
An analysis method and apparatus that perform vibration analysis, sensitivity analysis, and optimization to generate an optimal shape for automotive body parts by setting a design space and creating an optimization block model with specific gravity matching the target part's mass, considering inertial forces and applying loads to achieve both dynamic stiffness improvement and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the automotive body is increased to improve the static stiffness, then the static stiffness is improved, but the mass of the automotive-body parts increases, which prevents transition to a high-frequency region and results in a failure to improve the dynamic stiffness
Solution Approach 1:
The patent divides the automotive body into multiple discrete parts and performs sensitivity analysis on each part individually. By segmenting the structure, the invention identifies which specific parts contribute most to vibration characteristics, allowing targeted optimization rather than uniform thickness increase across the entire body, thus improving dynamic stiffness without proportionally increasing overall mass.
Solution Approach 2:
The patent transitions from traditional two-dimensional thickness optimization to three-dimensional topology optimization. By incorporating spatial distribution of material in three dimensions rather than simply increasing thickness in one dimension, the invention achieves improved dynamic stiffness through optimized material placement and structural configuration, avoiding the mass penalty associated with uniform thickness increases.
2Strength
If the mass M of a structure increases, then the stiffness K may increase, but the frequency Ω may not increase, resulting in failure to improve dynamic stiffness
Solution Approach 1:
The patent systematically varies multiple parameters including material density, structural geometry, and thickness distribution through sensitivity analysis. By changing these parameters in combination rather than adjusting a single parameter, the invention achieves frequency increase without proportional mass increase, resolving the contradiction between stiffness and vibration frequency.
Solution Approach 2:
The patent employs dynamic vibration analysis and sensitivity analysis that considers the dynamic behavior of the structure under vibration conditions. By optimizing the structure based on dynamic response characteristics rather than static properties alone, the invention achieves improved vibration frequency and dynamic stiffness performance without the mass penalty associated with static stiffness optimization.
3Weight of moving object
If traditional optimization technologies such as thickness optimization are used, then weight reduction is achieved, but the vibration performance and dynamic stiffness cannot be sufficiently improved
Solution Approach 1:
The patent performs sensitivity analysis as a preliminary step before final optimization. This preliminary action identifies which parts and parameters have the greatest influence on vibration characteristics, allowing the subsequent weight optimization to focus on critical areas. This ensures that weight reduction does not compromise dynamic stiffness in key structural regions.
Solution Approach 2:
The patent implements an iterative optimization process where vibration analysis results feed back into the design modification process. By continuously analyzing vibration performance and using that feedback to guide further optimization, the invention achieves a balance between weight reduction and dynamic stiffness improvement that single-pass thickness optimization cannot achieve.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method optimizes vibration performance by increasing dynamic stiffness while reducing weight, effectively addressing the challenge of high-frequency vibration and resonance issues, as demonstrated by increased peak frequencies and reduced weight compared to traditional thickness increase methods.
Implementation Method 1
performing optimization analysis for the optimization block model in consideration of an inertial force that occurs in a part of the automotive body due to excitation
Data Source
AI summary
An analysis method of optimizing vibration performance of a part of an automotive body, including: acquiring a maximum displacement of vibration of the part of the automotive body; acquiring a load required for applying a same displacement as the acquired maximum displacement, to the part of the automotive body; setting a design space by setting a part or member that supports the part of the automotive body as an optimization target; generating an optimization block model formed of three-dimensional elements in the set design space; generating an optimization analysis model by combining the generated optimization block model to the automotive body; and acquiring an optimal shape of the optimization block model by: applying the acquired load as a load condition; and performing optimization analysis for the optimization block model taking an inertial force that occurs in the part of the automotive body due to vibration into consideration.