Linear Resonance Actuator Frequency Calibration via Sampling Adjustment
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Solution Overview
Problem
Conventional methods for calibrating the frequency of driving voltage waveforms for linear resonance devices are complex and require recalibration due to shifts in natural frequency caused by ambient temperature, humidity, and element aging, leading to increased difficulty in self-calibration after devices are shipped.
Innovation Solution
A method and system that continuously corrects the actual sampling frequency by reading the standard driving voltage waveform, calculating the measured natural frequency, and adjusting the sampling frequency until it falls within a predetermined range, without modifying the waveform data stored in the driving chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional calibration method using high precision instruments and waveform data adjustment is employed, then the frequency calibration accuracy is improved, but the device complexity and calibration difficulty are increased
Solution Approach 1:
The linear resonance device performs self-calibration by using its own natural frequency characteristics as the reference standard. The calibration process automatically determines the actual sampling frequency by measuring the device's resonance frequency, eliminating the need for external high precision instruments and complex waveform data adjustments.
Solution Approach 2:
The method changes the calibration approach from adjusting waveform data parameters to directly determining the sampling frequency parameter based on the device's physical resonance characteristics. This parameter transformation simplifies the calibration process while maintaining accuracy.
2Adaptability or versatility
If waveform data in the driving chip is adjusted to adapt to different natural frequencies, then the adaptability to different actuators is improved, but the ease of operation and recalibration capability are worsened
Solution Approach 1:
The system automatically adapts to different actuators by measuring their natural frequencies and adjusting the sampling frequency accordingly, without requiring manual waveform data modification. This enables easy recalibration even after devices are shipped.
Solution Approach 2:
The calibration system dynamically adjusts the sampling frequency based on real-time measurements of the device's natural frequency, allowing the system to adapt to changes in environmental conditions and device aging without manual intervention.
3Measurement precision
If the actual sampling frequency is calibrated before shipping using high precision instruments, then the initial frequency accuracy is improved, but the ability to perform self-calibration after shipping is lost
Solution Approach 1:
The device is equipped with self-calibration capability that uses its own resonance characteristics as a reference, allowing it to automatically recalibrate the sampling frequency at any time after shipping without requiring external equipment or manual intervention.
Solution Approach 2:
The system continuously monitors the device's natural frequency and uses this feedback to automatically adjust the sampling frequency, ensuring ongoing accuracy without requiring external calibration equipment.
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
Ensures the frequency of the actual driving voltage waveform matches the natural frequency of the linear resonance device, enabling consistent vibration and allowing for automatic calibration anytime and anywhere, both before and after shipping.
Implementation Method 1
In a case that a current flows through the coil, a magnetic field is produced by the coil. The coil is connected to the magnetic mass block. If the current flowing through the coil changes, a direction and an intensity of the magnetic field change accordingly.
Implementation Method 2
stopping the driving of the linear resonance device, and collecting an induced electromotive force waveform of the linear resonance device in free oscillation
Data Source
AI summary
There are provided a method, a system and a device for calibrating a frequency of a driving voltage waveform for a linear resonance device. An actual sampling frequency is continuously corrected, so that a difference between a measured natural frequency of the linear resonance device obtained during a calibration process and a frequency of a standard driving voltage waveform stored in a driving chip for the linear resonance device is in a predetermined range. The driving chip outputs a driving waveform at a finally corrected actual sampling frequency, to drive the linear resonance device. Further, only an actual sampling frequency is required to be adjusted, and it is not required to modify waveform data stored in the driving chip for the linear resonance device.