Active Coil-Spring Vibration Isolator for Heavy-Load Stability
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Solution Overview
Problem
Existing vibration isolators using mechanical springs face issues with non-linear behavior, horizontal displacement, and complex installation requirements, particularly when handling heavy loads, which can lead to damage and reduced damping performance.
Innovation Solution
A vibration isolator design comprising an inner and outer housing with a coil spring and a vertical actuator, such as a magnetic actuator, coupled by leaf springs for rigid horizontal stability, allowing for compact installation and active vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a mechanical coil spring is used for vibration isolation, then the system is simple and enables passive vibration isolation, but the spring behaves non-linearly in the load limit range and damping properties become less favorable
Solution Approach 1:
The patent replaces the mechanical coil spring with a pneumatic spring that uses gas pressure for vibration isolation. This substitution eliminates the non-linear mechanical behavior of coil springs while maintaining the vibration isolation function, providing more consistent damping properties across the load range without compromising system simplicity
2Adaptability or versatility
If the height of a mechanical spring system is adjusted using a height-adjustable spring plate, then variations in isolated load are compensated, but torques arise that result in horizontal force causing displacement
Solution Approach 1:
The patent replaces the mechanical height-adjustable spring plate system with a pneumatic spring that can be adjusted in height without generating horizontal forces. The pneumatic adjustment mechanism eliminates the torque-induced horizontal displacement problem while maintaining the ability to compensate for load variations, thereby preserving horizontal stability
3Stability of the object's composition
If a pneumatic spring is used instead of a coil spring, then horizontal displacement is prevented, but the installation space increases and the structure becomes more complex
Solution Approach 1:
The patent optimizes the pneumatic spring parameters (gas pressure, volume, and physical dimensions) to achieve the required vibration isolation performance while minimizing the installation space. By carefully selecting and adjusting these parameters, the pneumatic spring provides horizontal stability without excessive space requirements
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 design achieves stable, compact, and efficient vibration isolation for heavy loads, preventing horizontal displacement and enabling high-frequency operation with adjustable natural frequency, suitable for sensitive equipment in the semiconductor industry.
Implementation Method 1
Vibration isolation systems comprising a mechanical spring, for example a coil spring
Implementation Method 2
an actuator acting in a vertical direction, which is arranged at least partially between the inner housing and the outer housing
Data Source
AI summary
The invention generally relates to an active vibration isolator having a coil spring which acts in a vertical direction. The invention also relates to a method for actively damping vibrations of a mounted load, for example a mounted machine, system or device.For this purpose, there is provided a vibration isolator having an inner housing with a cavity for receiving and holding a coil spring which is arranged in the cavity of the inner housing and acts in a vertical direction, and also an outer housing at least partially surrounding the inner housing. Between the inner housing and the outer housing there is arranged an actuator which acts in a vertical direction.