Shock Sensor Resonant Frequency Detection in Data Storage
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Solution Overview
Problem
Existing data storage devices face challenges in accurately detecting physical shocks affecting the head actuated over a disk, which can distort the response of shock sensors due to their resonant frequency, necessitating compensation to prevent data corruption or ensure precise head positioning.
Innovation Solution
The implementation of a shock sensor with a resonant frequency detection system that generates an oscillating signal by adjusting bias signals, allowing for the detection of physical shocks and compensation using a notch filter to attenuate the resonant frequency, thereby improving shock detection and head positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shock sensor is used to detect physical shocks affecting the head, then shock detection capability is improved, but the sensor response is distorted due to resonant frequency
Solution Approach 1:
The patent applies mechanical vibration by exciting the shock sensor at its resonant frequency to deliberately induce oscillations. This allows the system to detect the resonant frequency characteristics of the sensor, which can then be used to compensate for distortion in the sensor's shock response, thereby improving measurement precision while maintaining detection capability
Solution Approach 2:
The patent changes the operating parameters of the shock sensor by applying differential excitation signals that vary in amplitude and frequency. By adjusting these parameters, the system can identify the resonant frequency point and use this information to compensate for distortion, resolving the contradiction between detection capability and measurement precision
2Measurement precision
If resonant frequency compensation is implemented using a notch filter, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces a notch filter as an intermediary component in the signal processing path. This filter selectively attenuates the resonant frequency while allowing other frequencies to pass through, thereby compensating for sensor distortion with minimal complexity addition. The notch filter acts as a mediator between the raw sensor signal and the final shock detection output
Solution Approach 2:
The patent implements feedback by using the detected resonant frequency information to configure the notch filter parameters. The system continuously monitors the sensor response, identifies resonant frequency characteristics, and adjusts the filter settings accordingly, creating a closed-loop compensation system that maintains precision while managing 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
This solution enhances the ability to detect and compensate for physical shocks, ensuring accurate head positioning and preventing data corruption by effectively filtering out the resonant frequency distortion in shock sensor responses, thus improving the reliability of data storage operations.
Implementation Method 1
a shock sensor (20) comprising a first terminal (22A) and a second terminal (22B)
Implementation Method 2
generates an oscillating signal representing the resonant frequency of the shock sensor by adjusting bias signals applied to both terminals of the shock sensor
Data Source
AI summary
A data storage device is disclosed comprising a disk, a head, and a shock sensor comprising a first terminal and a second terminal. A first bias signal is applied signal to the first terminal of the shock sensor and a second bias signal is applied to the second terminal of the shock sensor. An oscillating signal is generated by increasing the first bias signal and decreasing the second bias signal, and a resonant frequency of the shock sensor is detected based on the oscillating signal. A physical shock affecting the head actuated over the disk is detected based on a response of the shock sensor to the physical shock and based on the detected resonant frequency of the shock sensor.