Vibration Shaker Offset Control for Rotational Mode Suppression
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Solution Overview
Problem
Conventional vibration-testing systems face challenges in achieving accurate vibration tests due to the appearance of rotational modes, which cause incorrect acceleration velocities in the Y- or Z-direction, preventing a correct vibration test.
Innovation Solution
A vibration-testing system with horizontal vibration shakers positioned on both sides of the vibration table, a sensor to detect rotational modes, and a control mechanism that adjusts the vertical position of the shakers and their vibration forces to create a positional difference and suppress the rotational mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If horizontal vibration shakers are used to generate vibration in X and Y directions, then vibration testing capability is improved, but rotational mode appears causing incorrect acceleration velocity in Y- or Z-direction
Solution Approach 1:
The system uses sensors to detect rotational mode and feeds this information back to the control unit, which then adjusts the vibration shakers to compensate for the rotational mode, ensuring accurate vibration testing
Solution Approach 2:
The control unit changes the operational parameters of the vibration shakers dynamically based on detected rotational mode, adjusting their position and vibration characteristics to eliminate harmful rotational effects
2Adaptability or versatility
If vibration shakers are disposed individually with separate connections, then system flexibility is improved, but complexity of connections and control increases
Solution Approach 1:
The patent combines multiple vibration shakers into an integrated vibration generation unit with a unified control system, reducing the number of separate connections and simplifying control while maintaining system flexibility
Solution Approach 2:
The control unit is designed to manage multiple vibration shakers with different functions (horizontal X-direction, horizontal Y-direction, vertical Z-direction) through a single multi-functional controller, reducing overall system complexity
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 system effectively suppresses rotational modes by producing a positional offset and controlling vibration forces, ensuring accurate and correct vibration tests even when rotational modes appear.
Implementation Method 1
a sensor for detecting a rotational mode appeared in the vibration table
Implementation Method 2
horizontal vibration shakers disposed on both sides of the vibration table in opposite to each other and for vibrating the vibration table
Implementation Method 3
a control means for moving vertically the horizontal vibration shakers by the means based on a detection signal of the rotational mode derived from the sensor
Data Source
AI summary
Horizontal vibration shakers 21a and 21b are disposed opposite to each other on both sides of a vibration table 4, and either of the horizontal vibration shakers, e.g. 21a is arranged vertically movable so as to produce a positional difference (offset) with respect to a horizontal vibration axis 63 of the other horizontal vibration shaker 21b. When it is supposed that an accelerated velocity appears upwards on the left side of the vibration table 4, while another accelerated velocity appears downwards on the right side of the vibration table 4 as a result of generation of a rotational mode M, one of the horizontal vibration shakers, e.g. 21a, is elevated to produce the positional difference (offset) with respect to the horizontal vibration axis 63 of the other opposed horizontal vibration shaker 21b. In addition, vibration forces of the horizontal vibration shakers 21a and 21b are controlled at the same time to produce a moment towards the reverse direction, whereby the rotational mode M is suppressed so as to balance the right and left moments.