Transportation Vehicle Panel Member with Oriented Patch
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Solution Overview
Problem
Existing panel assemblies and vehicle floor tubs fail to sufficiently improve vibration characteristics at specific frequencies, leading to inadequate noise and vibration suppression in transportation vehicles.
Innovation Solution
A panel member with a patch member constructed from a rolled metal plate and a vibration attenuating resin layer, where the patch panel is oriented at an acute angle of 30 to 70 degrees relative to its rolling direction, and the base plate is also produced with a similar orientation, enhancing the anisotropy in Young's modulus to improve vibration attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a patch panel is affixed on a main panel to improve vibration characteristic, then the natural frequency in primary mode increases, but the vibration characteristic at usage frequencies cannot be sufficiently improved
Solution Approach 1:
The patent changes the orientation angle parameter of the patch panel relative to the rolling direction, specifying an acute angle between 30 to 70 degrees. This parameter change optimizes the anisotropic Young's modulus distribution to improve vibration characteristics at usage frequencies while maintaining the natural frequency enhancement effect.
Solution Approach 2:
The patent employs a composite structure consisting of a patch panel made from rolled metal plate with specific orientation combined with a base panel. This composite configuration leverages the anisotropic properties of the rolled metal plate to achieve superior vibration attenuation performance that cannot be obtained by simple affixing of isotropic panels.
2Productivity
If a patch panel is obtained from a rolled metal plate with rolling direction parallel to longitudinal direction for production yield, then manufacturing efficiency increases, but the vibration characteristic of the panel member cannot be sufficiently improved
Solution Approach 1:
The patent modifies the orientation parameter by specifying that the acute angle between the longitudinal direction and rolling direction should be 30 to 70 degrees, rather than using the conventional parallel orientation. This parameter change optimizes the utilization of anisotropic Young's modulus to improve vibration characteristics while still maintaining reasonable manufacturing efficiency.
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 solution significantly improves the vibration characteristic of the panel member by optimizing the angle between the patch panel's longitudinal direction and rolling direction, effectively suppressing noise and vibration across a range of frequencies.
Implementation Method 1
a vibration attenuating resin layer provided along a surface of the patch panel
Implementation Method 2
vibration characteristic of the panel member cannot be sufficiently improved by merely affixing the sound attenuating panel on the main panel
Implementation Method 3
The amount of the plastic strain differs according to the direction at any position in the metal plate. For example, the amount of the plastic strain differs between the rolling direction and a direction orthogonal to the rolling direction (width direction). The difference in the plastic strain generates anisotropy in the Young's modulus of the metal plate.
Implementation Method 4
Metal plates that are produced via a rolling step are applied with plastic strain in rolling
Data Source
AI summary
A transportation vehicle part includes: a patch member 13 constructed of a plate-like metal patch panel 12, and a vibration attenuating resin layer 14 provided along a surface of the patch panel 12; and a metal base plate 16 closely adhered with the vibration attenuating resin layer 14 of the patch member 13 and affixed with the patch member 13. The patch panel 12 is produced via a rolling step. An acute angle between a longitudinal direction and a rolling direction of the patch panel 12 is 30 to 70 degrees. According to this structure, the natural frequency in a primary mode is made high, whereby the vibration characteristic is improved.