Antivibration Device Multi-Orifice Liquid Chamber Design
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Solution Overview
Problem
Existing antivibration devices struggle to achieve damping performance across a broad frequency band range due to limitations in spring constant and resonance characteristics.
Innovation Solution
The antivibration device incorporates two orifice passages and a third liquid chamber, allowing for adjustable spring constant and resonance characteristics, enabling effective damping across a broader frequency range, and is designed to be compact with reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single orifice passage is used to set desired spring constant and resonance characteristics, then the spring constant and resonance characteristics are optimized, but damping performance cannot be attained in a broad frequency band range
Solution Approach 1:
The single orifice passage is segmented into multiple orifice passages (first, second, and third orifice passages) with different flow resistance characteristics. Each passage handles different frequency components of vibration, allowing the system to achieve damping performance across a broad frequency band range while maintaining optimized spring constant and resonance characteristics.
2Manufacturing precision
If the size (length and cross-sectional area) of orifice passage is set to obtain desired spring constant and resonance characteristic, then spring constant and resonance characteristic are obtained, but damping performance is limited to narrow frequency range
Solution Approach 1:
The orifice passage is divided into multiple segments (first, second, third orifice passages) with different dimensional characteristics. The first orifice passage has specific length and cross-sectional area for primary resonance control, while the second and third passages provide additional damping stages, enabling precise spring constant control alongside broad frequency band damping performance.
Solution Approach 2:
The system dynamically engages different orifice passages based on vibration frequency. Lower frequency vibrations primarily utilize the first orifice passage, while higher frequency vibrations engage the second and third passages, allowing the system to adaptively provide damping across a broad frequency range while maintaining precise spring characteristics.
3Adaptability or versatility
If multiple orifice passages and third liquid chamber are added to broaden frequency band damping, then damping performance in broad frequency range is achieved, but device complexity increases
Solution Approach 1:
The multiple orifice passages and third liquid chamber are nested within the existing cylindrical structure. The first, second, and third orifice passages are arranged concentrically or in series within the same structural envelope, and the third liquid chamber is integrated into the existing chamber configuration, allowing broad frequency band damping without proportionally increasing overall device size or structural complexity.
Solution Approach 2:
The additional orifice passages and third liquid chamber serve multiple functions simultaneously: they provide damping across extended frequency ranges, maintain spring constant characteristics, and integrate with the existing structural framework. This multi-functionality allows the system to achieve broad frequency band performance without linearly increasing device complexity.
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 device effectively absorbs vibrations across a wide frequency range, achieving desired spring characteristics and damping performance while being compact and cost-effective.
Implementation Method 1
an elastic member arranged between the inner cylinder and the outer cylinder
Implementation Method 2
operating liquid flows in the orifice passage, liquid column resonance occurs in the orifice passage, and vibration is thereby damped
Implementation Method 3
operating liquid flows in the orifice passage, liquid column resonance occurs in the orifice passage, and vibration is thereby damped
Data Source
AI summary
An antivibration device capable of attaining damping performance in a comparatively broad frequency band range is provided. In the antivibration device, between an inner cylinder and an outer cylinder, formed are a first liquid chamber, a second liquid chamber, and a third liquid chamber. There are provided a first orifice passage that makes the first liquid chamber and the second liquid chamber communicate with each other, and a second orifice passage that makes one of the first liquid chamber and the second liquid chamber and the third liquid chamber communicate with each other.