Eight-Drive Vibration Apparatus with Adjustable Spatial Pose
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Solution Overview
Problem
Traditional six-degrees-of-freedom vibration testing apparatuses, particularly those using electrodynamic shakers, face limitations in controlling the spatial pose of the working platform, leading to deviations from balanced positions and increased risk of test failures or damage due to unidirectional vibration testing methods that fail to simulate multi-dimensional environments effectively.
Innovation Solution
An eight-drive six-degrees-of-freedom electrodynamic vibration testing apparatus with an adjustable spatial pose is designed, incorporating a supplementary coupling assembly that provides twelve driving forces to control the platform's position, utilizing a split combination and annular connection structure for the pedestal and corner bases, and double-spherical-coupling decoupling apparatuses to achieve precise alignment and high resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If eight electrodynamic shakers are used to drive the working platform, then the vibration frequency and waveform quality are improved, but the spatial pose control capability deteriorates due to insufficient driving forces
Solution Approach 1:
The patent divides the driving system into two independent parts: eight electrodynamic shakers for vibration excitation and four supplementary coupling assemblies for pose control. Each supplementary coupling assembly contains multiple air springs that can be independently controlled, providing additional driving forces without interfering with the vibration testing function.
Solution Approach 2:
The supplementary coupling assemblies serve multiple functions: they provide additional driving forces for spatial pose control, maintain platform alignment during testing, and compensate for imbalances in the electrodynamic shaker system. This multi-functionality resolves the contradiction by adding control capability without sacrificing vibration performance.
2Device complexity
If air springs are used inside electrodynamic shakers to control platform pose, then the structure is simplified, but the spatial pose adjustment range is limited due to unidirectional force capability
Solution Approach 1:
The patent transitions from unidirectional force control to multi-directional force control by arranging air springs in different orientations within the supplementary coupling assemblies. This allows the system to exert forces in multiple spatial dimensions, enabling comprehensive pose adjustment while maintaining structural simplicity.
3Measurement precision
If the working platform is constrained to fixed position, then alignment precision is improved, but the ability to simulate multi-dimensional vibration environments deteriorates
Solution Approach 1:
The patent implements dynamic pose control where the working platform can be positioned and repositioned during different phases of testing. The supplementary coupling assemblies enable the platform to maintain precise alignment during each test phase while allowing reconfiguration between tests to simulate different multi-dimensional vibration environments.
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 static and dynamic alignment of the working platform, reducing the risk of over-displacement faults and test failures, while achieving wide vibration frequency and minimizing waveform distortion, thus effectively simulating multi-dimensional vibration environments.
Implementation Method 1
eight electrodynamic shakers are used as excitation sources
Implementation Method 2
motion components of the electrodynamic shakers control a pose of a working platform only through air springs inside the shakers
Data Source
AI summary
Disclosed is an eight-drive six-degrees-of-freedom electrodynamic vibration testing apparatus having an adjustable spatial pose, which includes a pedestal center base. Four corners of a square cavity above the pedestal center base are sequentially provided with a fifth shaker, a sixth shaker, a seventh shaker, and an eighth shaker. A first pedestal side base is fixedly connected to a side wall of the pedestal center base. The pedestal center base, the pedestal side bases, and corner connecting bases are designed in a manner of split combination and annular connection, thereby reducing the difficulty in overall transportation, processing and installation; moreover, by using an annular fastening structure, high resonance frequency is achieved, low-frequency resonance of the apparatus is effectively reduced.