Seismic Damper Assembly for Semiconductor Equipment Stability
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Solution Overview
Problem
During seismic events like earthquakes, buildings experience uncontrollable movements causing objects to collide with each other, leading to potential damage and instability of semiconductor fabrication components.
Innovation Solution
A damper apparatus is employed to mitigate lateral displacement by converting lateral forces into vertical movements using a base plate with a curved surface and damper bodies, and a flywheel assembly to absorb seismic energy, thereby reducing displacement and collision risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rigid support structures are used during seismic events, then structural strength is maintained, but lateral displacement and collision damage occur due to uncontrollable building movement
Solution Approach 1:
The patent applies dynamics by using a curved surface configuration that allows the support structure to dynamically adapt during seismic events. The curved surface enables controlled lateral movement and energy dissipation through friction, transforming the rigid static support into a dynamic system that can accommodate seismic forces while reducing displacement damage.
Solution Approach 2:
The patent converts the harmful lateral seismic forces into beneficial frictional energy dissipation. By designing a curved surface interaction between support components, the lateral movement that would normally cause damage is transformed into useful friction that absorbs seismic energy, reducing overall displacement and collision risks.
2Object-affected harmful factors
If friction is increased to reduce lateral displacement, then displacement control improves, but energy loss increases
Solution Approach 1:
The patent converts the potentially harmful lateral seismic energy into useful frictional dissipation. The curved surface design ensures that energy is dissipated through controlled friction during the seismic event, reducing displacement while the energy loss is acceptable as it represents seismic energy being removed from the system rather than causing damage.
Solution Approach 2:
The friction characteristic is made dynamic through the curved surface interaction. The friction force automatically adjusts based on the lateral movement magnitude and direction, providing optimal displacement control without requiring active control systems. The friction engages when needed during seismic events and disengages during normal operation.
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 apparatus effectively reduces lateral displacement, vibration, and damage to semiconductor components by absorbing seismic energy, enhancing stability and preventing collisions.
Implementation Method 1
interaction between the one or more damper bodies with the first surface of the base plate translates the lateral force induced by the seismic event to the vertical movement of the equipment support structure
Implementation Method 2
a flywheel assembly to absorb seismic energy
Data Source
AI summary
An apparatus is provided. The apparatus includes an equipment support structure configured to support a semiconductor fabrication component. The apparatus includes a damper assembly configured to resist a lateral force induced by a seismic event to the equipment support structure. The damper assembly includes a gear rack coupled to the equipment support structure. The damper assembly includes a first flywheel assembly including a first mass damper flywheel and a first gear meshed with the gear rack and selectively engaged with the first mass damper flywheel.