Circular Vibration Table Surface for Uniform Multi-Axis Excitation
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Solution Overview
Problem
Vibration tables face challenges in transmitting high vibration energy over a broad frequency range with minimal variability across their surface, as conventional designs suffer from resonance-induced vibration profile variations and dampening effects from insulation, limiting energy transmission and frequency response.
Innovation Solution
A vibration table with a circular upper surface and novel inserts that securely attach test products, featuring a center support, edge spacers, and insulating layers, which minimizes vibration variation across the surface by enhancing rigidity and force transmission through strategically placed bolts and inserts, allowing for uniform multi-axis excitation and improved temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional square or rectangular upper surface is used, then the table structure is simple and easy to manufacture, but the vibration profile varies up to 20% over the surface due to resonance of vibrations reflected and concentrated by the sides and corners
Solution Approach 1:
The patent applies the spheroidality principle by changing the upper surface geometry from a conventional square or rectangular shape to a circular shape. This curvature-based design eliminates the corners and straight edges that cause vibration reflection and concentration, thereby reducing vibration profile variability from up to 20% to less than 5% across the surface.
2Temperature
If insulation is incorporated in the vibration table, then temperature control is improved, but the insulation has a dampening effect that reduces energy transmission and frequency response
Solution Approach 1:
The patent applies the local quality principle by providing insulation only at the periphery of the vibration table rather than covering the entire upper surface. This localized insulation approach allows temperature control at the edges while leaving the central testing area free of dampening effects, preserving vibration energy transmission and frequency response characteristics.
3Strength
If the table is made as rigid as possible, then higher frequency and higher energy transmission is maximized, but the table weight increases causing energy loss
Solution Approach 1:
The patent applies the composite materials principle by constructing the vibration table from multiple materials with different properties: an aluminum upper plate providing rigidity and vibration transmission, titanium or stainless steel inserts providing localized strength and threaded openings, and peripheral insulation providing thermal control. This composite structure achieves the necessary rigidity for high-frequency transmission while minimizing overall weight.
4Adaptability or versatility
If the table transmits high vibration energy over a broad frequency range, then testing capability is improved, but vibration profile variability across the surface increases
Solution Approach 1:
The patent applies the spheroidality principle by using a circular upper surface geometry that eliminates corners and straight edges, which are sources of vibration reflection and concentration. This curved geometry distributes vibrations more uniformly across the surface, maintaining vibration profile variability of less than 5% even when transmitting high energy over a broad frequency range up to 10,000 Hz.
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 achieves a vibration profile variability of less than 5% across the surface, enabling the transmission of higher acceleration forces (up to 120 Gs RMS) over a broader frequency range (up to 10,000 Hz) with improved temperature control and reduced energy loss, surpassing conventional tables in energy responsiveness and frequency spectrum.
Implementation Method 1
vibrators for generating vibrations in x-, y- and z-axes lying in the plane of the upper surface
Implementation Method 2
an insulating sheet is often bonded to the top of the upper plate
Data Source
AI summary
A vibration table having an upper surface defining a plane and on which test products are mounted by bolts that engage spaced internally threaded openings in the upper surface. The vibration table has mounted vibrators for generating vibrations in x-, y- and z-axes lying in the plane of the upper surface. Variation in the magnitude of the vibrations generated in the x-, y- and z-axes over the surface of the table are minimized by providing an upper surface that is circular in the plane of the upper surface.