Six-Degree-of-Freedom Vibrational Excitation Platform
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Solution Overview
Problem
Existing vibration testing machines face challenges in achieving low-frequency controllability, distortion-free operation, high load capacity, and effective vibration isolation across various frequency ranges, particularly in mid-low frequency ranges and in ensuring stability and reliability during long-term use.
Innovation Solution
A six-degree-of-freedom vibrational excitation foundation platform is designed, featuring a marble platform and support frame with strategically positioned motors, air springs, and a reinforced structure to withstand reactive forces, ensuring high stiffness, strength, and stability, with natural frequencies above the maximum excitation frequency to prevent resonance and allow for decoupling control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional electric vibrational excitation is used, then mid-high frequency ranges can be covered, but low-frequency controllability and distortion-free operation are insufficient
Solution Approach 1:
The system divides the frequency excitation task into two segments: electro-hydraulic actuators handle low-frequency excitation (0-200Hz) while electric actuators handle mid-high frequency excitation. This segmentation allows each actuator type to operate in its optimal frequency range, resolving the contradiction between covering broad frequency ranges and maintaining low-frequency controllability.
Solution Approach 2:
The vibration testing machine is designed with multi-functional capability to perform both low-frequency and mid-high frequency vibration testing through different actuator systems. The electro-hydraulic platform and electric platform work together to provide universal frequency coverage, enabling the system to achieve both low-frequency controllability and mid-high frequency performance.
2Speed
If electro-hydraulic platform is used for mid-low frequency ranges, then frequency coverage is improved, but distortion-free operation and control quality are compromised
Solution Approach 1:
The system segments the waveform generation and control functions: electro-hydraulic actuators provide frequency coverage for mid-low ranges while electric actuators provide high-precision waveform control for distortion-free operation. This segmentation allows each system to excel in its designated frequency range without compromising overall waveform quality.
3Strength
If the platform structure is reinforced to withstand reactive forces, then stability and strength are improved, but natural frequency may approach excitation frequency causing resonance
Solution Approach 1:
The support frame is designed with dynamic characteristics that ensure its natural frequency remains outside the excitation frequency range. The frame's stiffness and mass are optimized to achieve a natural frequency higher than the maximum excitation frequency, preventing resonance while maintaining the strength needed to withstand motor reactive forces during vibration testing.
4Stability of the object's composition
If motors are fixedly connected to the support frame, then structural stability is improved, but maintenance accessibility and component replacement become difficult
Solution Approach 1:
The motor mounting structure is segmented into modular components with standardized interfaces. Motors are connected through mounting plates and bolts rather than permanent fixed connections, allowing individual motors to be removed and replaced independently while maintaining overall structural stability during operation. This modular approach enables easy maintenance without compromising structural integrity.
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 platform achieves controllable frequency and amplitude excitation without resonance, supports high loads, and ensures reliable long-term operation with lower Mises stress than compressive strength, enabling precise vibration simulation and maintenance accessibility.
Implementation Method 1
the marble platform support frame is an assembly that supports the marble platform and withstands reactive force of a motor
Implementation Method 2
the motor and air springs are installed on the marble platform support frame; the marble platform serves as an excitated device
Data Source
AI summary
Provided is a six-degree-of-freedom vibrational excitation foundation platform, which solves the problem of the existing vibrational excitation foundation equipment that a vibrational excitation frequency band is narrow due to low natural frequency of the equipment. The six-degree-of-freedom vibrational excitation foundation platform includes a marble platform support frame, which is fixedly installed on a concrete floor through a backing plate; and a marble platform, which serves as an excitated device and is located in a middle of the support frame, and four sides of the marble platform support frame are connected to the motors fixedly connected to the support frame through connecting plates. The parallel connection of motor outputs solves the problem of insufficient excitation, and natural frequency of each part of the platform is increased by optimizing the marble platform and the support frame, such that the frequencies are controllable within the vibrational excitation frequency band.