Vibration Control System with Coherent Phase Generator
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Solution Overview
Problem
Current random vibration control systems generate vibrations with Gaussian amplitude distribution, which fail to accurately simulate real-world environments characterized by higher peaks and varying kurtosis, as they cannot independently control frequency content and amplitude distribution without distorting the spectral content.
Innovation Solution
A method and apparatus that control both frequency spectrum and amplitude distribution in the frequency domain by using phase relationships to modify the amplitude distribution without affecting the frequency content, employing a coherent phase generator to adjust the phase and kurtosis of the vibration signal, allowing for precise simulation of real-world vibration environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional random vibration control systems generate vibrations with Gaussian amplitude distribution, then the frequency content can be controlled, but the amplitude distribution cannot be independently adjusted to match real-world environments with higher peaks and varying kurtosis
Solution Approach 1:
The invention segments the control process into two independent parts: frequency spectrum control and amplitude distribution control. The frequency spectrum is controlled through power spectral density shaping, while the amplitude distribution is controlled separately through kurtosis adjustment using a coherent phase generator. This segmentation allows both frequency content accuracy and amplitude distribution adaptability to be achieved simultaneously without mutual interference.
Solution Approach 2:
The invention changes the parameter being controlled from the traditional Gaussian amplitude distribution to a controllable kurtosis parameter. By adjusting the kurtosis parameter through the coherent phase generator, the system can independently modify the amplitude distribution characteristics (creating more or fewer peaks) without affecting the frequency spectrum, thus enabling adaptation to real-world vibration environments with varying peak characteristics.
2Adaptability or versatility
If feedback control is used to adjust amplitude distribution, then amplitude characteristics can be improved, but spectral content distortion occurs
Solution Approach 1:
The control system is segmented into independent frequency control and amplitude control pathways. The frequency control pathway maintains spectral accuracy through power spectral density shaping, while the amplitude control pathway adjusts kurtosis through coherent phase generation. This segmentation prevents the spectral content distortion that would result from using feedback control that affects both frequency and amplitude simultaneously.
Solution Approach 2:
The coherent phase generator acts as an intermediary device that specifically modifies the phase relationships of frequency components to alter amplitude distribution characteristics. By introducing this intermediate element, the system can adjust kurtosis and peak characteristics without directly manipulating the frequency spectrum, thus avoiding spectral content distortion while achieving amplitude distribution control.
Data Source
AI summary
A vibration generation system and method independently controls both frequency spectrum and amplitude distribution. Sensed vibration is used in feedback as a control to generate a controlled drive signal applied to a mechanical actuator. The amplitude distribution has a specified statistical characteristic adjusted to match a target characteristic, such as kurtosis, by adjusting a relative proportion of a coherent component in a randomized phase, which is then combined on a frequency-by-frequency basis with the separately adjusted frequency spectrum while in the frequency domain.