Adaptive Vibration Sweep for Device Response Characterization
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Solution Overview
Problem
Current vibration testing methods often underestimate or mischaracterize a device's response to vibrations due to high frequency sweep rates, requiring slower sweep rates to ensure accuracy, which increases testing time and cost.
Innovation Solution
A system that characterizes a device's response to vibration by vibrating it at each frequency in a range until a stabilized response is determined, using a vibration-frequency-control mechanism, read-rate monitor, and frequency-response-characterization mechanism to measure and record the stabilized read or write rates and time constants across the frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high frequency sweep rate is used during vibration testing, then testing time is reduced and throughput is increased, but the device response may be underestimated or mischaracterized
Solution Approach 1:
The patent applies dynamics by making the frequency sweep rate adaptive rather than constant. The system dynamically adjusts the sweep rate based on real-time monitoring of device response characteristics, specifically detecting when the response reaches steady state at each frequency. This allows the testing system to slow down automatically when needed to capture accurate steady-state responses while maintaining higher speeds when the device responds quickly, thereby resolving the contradiction between testing throughput and measurement precision.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring the device response during vibration testing and using this information to control the frequency sweep rate. The system detects steady-state conditions through feedback signals and adjusts the sweep rate accordingly, ensuring that measurements are taken at appropriate moments when the device response has stabilized. This feedback loop enables accurate response characterization without requiring uniformly slow sweep rates across the entire frequency range.
2Measurement precision
If a slow frequency sweep rate is used to ensure accurate steady-state response measurement, then measurement precision is improved, but testing time increases and productivity decreases
Solution Approach 1:
The patent applies partial action by using slow sweep rates only when necessary - specifically when the device response requires longer time to reach steady state at certain frequencies. Rather than uniformly slowing the sweep rate across the entire frequency range, the system selectively reduces the sweep rate only during frequency ranges where the device exhibits slow response characteristics. This partial application of slow sweeping minimizes overall testing time while ensuring accurate measurements where needed.
Solution Approach 2:
The patent implements parameter changes by dynamically modifying the sweep rate parameter based on detected device response characteristics. The system monitors response parameters such as amplitude and phase changes over time and adjusts the sweep rate parameter in real-time accordingly. When the device response indicates quick steady-state achievement, the sweep rate parameter is increased; when slow response is detected, the sweep rate parameter is decreased, thereby optimizing both measurement accuracy and testing time.
Data Source
AI summary
Some embodiments of the present invention provide a system that characterizes a response of a device in a computer system to vibration over a frequency range. During operation, the device is vibrated at each frequency in a set of frequencies in the frequency range, wherein the device is vibrated at each frequency, one frequency at a time, until a stabilized response of the device is determined. The response of the device to vibration over the frequency range is then characterized based on information related to the stabilized response at each frequency in the set of frequencies.