Vibration-Damping Module for Electrical Equipment NVH Reduction
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Solution Overview
Problem
Electrical equipment, such as inverters, often experience Noise, Vibration, and Harshness (NVH) problems due to inadequate joining of housing components and gaps, leading to vibrations that cause operational issues over time.
Innovation Solution
A low-cost vibration-damping module is integrated into the electrical equipment, featuring a support element with protrusions and an adhesive layer to securely fasten the cover panel, effectively reducing vibrations by supporting the panel and absorbing vibrations through a soft, flexible material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the housing components are firmly joined to eliminate gaps, then the NVH performance is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The housing is divided into modular components (cover panel, peripheral wall, support panel) that can be separately manufactured and assembled. The support element is further segmented into a support panel and protrusions, allowing independent optimization of each component while maintaining overall structural integrity and reducing NVH issues.
Solution Approach 2:
The support element acts as an intermediary component between the peripheral wall and the cover panel. It provides mechanical support and vibration damping without requiring direct firm joining of the housing components, thus eliminating gaps and reducing NVH while maintaining manufacturing simplicity.
2Object-affected harmful factors
If support elements are added to reduce vibrations, then the NVH performance is improved, but the device complexity increases
Solution Approach 1:
The support element combines multiple functions into a single component: it provides structural support through the support panel, vibration damping through the protrusions, and structural reinforcement through the integrally formed rigid structure. This merging reduces the total number of components while effectively addressing vibration issues.
Solution Approach 2:
The support element utilizes composite construction with a support panel (which can be flexible or rigid) and integrally formed protrusions (rigid structure). This composite approach provides both support and vibration damping properties within a single component, improving NVH performance without proportionally increasing device complexity.
3Stability of the object's composition
If the cover panel is firmly fastened to the peripheral wall, then the structural stability is improved, but the vibration damping capability decreases
Solution Approach 1:
The housing structure exhibits local quality variations: the support element provides rigid support at specific locations (where protrusions contact the cover panel), while the cover panel itself maintains flexibility for vibration damping. This localized differentiation allows the structure to be stable where needed while remaining compliant for vibration absorption elsewhere.
Solution Approach 2:
The support panel can be configured as flexible or rigid, allowing the structure to adapt its dynamic characteristics. The integrally formed rigid protrusions provide stable support points, while the overall cover panel maintains dynamic flexibility for vibration damping, creating a balanced system that achieves both stability and vibration reduction.
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 vibration-damping module significantly reduces NVH problems by increasing the first modal frequency of the cover panel and decreasing vibration speed/amplitude by 40%, enhancing the operational stability of electrical equipment without altering its structure or increasing production costs.
Implementation Method 1
The adhesive layer is made of a soft and flexible material, so as to absorb at least part of vibrations of the cover panel
Data Source
AI summary
The invention relates to a module configured to reduce or eliminate NVH problems and electrical equipment provided with the module. Electrical equipment includes a housing; the housing includes a cover panel, a peripheral wall, and a chamber defined by the peripheral wall and the cover panel; a part of the cover panel is fastened to upper edges of the peripheral wall; and the electrical equipment further includes at least one support element which is installed inside the chamber at a distance from the peripheral wall, and is configured to support the cover panel.