Counter-Balanced Oscillation Device for Triaxial Vibration Testing
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Solution Overview
Problem
Existing oscillating devices are unable to perform triaxial simultaneous vibration tests at frequencies equal to or more than 2 kHz due to insufficient rigidity and motion accuracy of linear guides, leading to increased vibration noises.
Innovation Solution
The oscillating device incorporates a vibrating table coupled with actuators in orthogonal directions via coupling mechanisms and counter balancers to compensate for imbalances caused by these couplings, ensuring precise motion and reduced vibration noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coupling mechanisms are attached to the vibrating table to enable multi-directional oscillation, then the device can perform triaxial simultaneous vibration testing, but vibration noises increase due to imbalance caused by the coupling mechanisms
Solution Approach 1:
The patent applies counter balancers to compensate for the imbalance generated by coupling mechanisms. The counter balancer is configured with a mass and radius of gyration that satisfy specific mathematical relationships (Equations 1-3) to generate counterbalancing forces that cancel out the vibration noise produced by the coupling mechanism during oscillation.
2Measurement precision
If linear guides are used to couple actuators with the vibrating table, then motion accuracy is improved, but rigidity is insufficient at frequencies equal to or more than 2 kHz
Solution Approach 1:
The patent transitions from static coupling mechanisms to dynamic coupling mechanisms that can adapt their characteristics based on oscillation frequency. The coupling mechanism includes movable components that can adjust their position and stiffness characteristics dynamically, allowing the system to maintain both motion accuracy at low frequencies and rigidity at high frequencies up to 2 kHz and above.
3Strength
If rolling guides are used to improve linear guide rigidity, then high frequency oscillation capability is enhanced, but motion accuracy and rectilinearity deteriorate
Solution Approach 1:
The patent employs a composite coupling mechanism that combines elements of both rolling guides and linear guides. The coupling mechanism uses rolling elements (balls or rollers) within a structured framework that maintains geometric precision, creating a hybrid system that achieves both high rigidity for frequency response up to 2 kHz and maintained motion accuracy through careful design of the rolling path constraints.
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 enables triaxial simultaneous vibration testing at frequencies up to 2 kHz with reduced vibration noise, improving the rigidity and motion accuracy of the oscillating device.
Implementation Method 1
a counter balancer attached to the vibrating table and configured to compensate an imbalance of an oscillated portion including at least the vibrating table, the imbalance being caused by attaching the coupling mechanism to the vibrating table
Data Source
AI summary
An oscillating device includes a vibrating table to which an oscillated object is to be attached, and an oscillating unit that oscillates the vibrating table in a predetermined direction. The vibrating table includes a hollow part in which the oscillated object is accommodated, a bottom plate, a frame part that protrudes perpendicularly from an edge portion of the bottom plate, and an intermediate plate arranged inside the frame part. The intermediate plate has a shape of a lattice protruding perpendicularly from the bottom plate.