Frequency Characteristics Measurement Method and Positioning Control Device
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Solution Overview
Problem
Existing positioning control devices face challenges in maintaining measurement accuracy, particularly in high frequency regions, due to prolonged data acquisition times and lack of indicators for optimal measurement duration, leading to potential inefficiencies in frequency characteristics measurement.
Innovation Solution
A positioning control device that applies a frequency-swept sinusoidal signal with varying cycle numbers and durations at each frequency, coupled with spectral analysis, to optimize measurement accuracy and reduce measurement time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data acquisition time is prolonged to improve measurement accuracy, then measurement accuracy of frequency characteristics is improved, but measurement time becomes excessively long
Solution Approach 1:
The patent applies dynamics by making the data acquisition time variable rather than constant. The control unit dynamically adjusts the data acquisition time based on the frequency being measured, using longer times for low frequencies and shorter times for high frequencies. This dynamic adjustment optimizes the balance between measurement accuracy and measurement time across different frequency regions.
Solution Approach 2:
The patent changes the parameter of data acquisition time based on frequency. By establishing a relationship between frequency and optimal data acquisition time, the system uses different time parameters for different frequency ranges, allowing accurate measurement without uniformly prolonged measurement time across all frequencies.
2Loss of time
If data acquisition time is kept constant to reduce measurement time, then measurement time is shortened, but measurement accuracy in high frequency region is degraded
Solution Approach 1:
The patent applies local quality by optimizing data acquisition time for specific frequency regions rather than using a uniform time for all frequencies. The control unit determines appropriate data acquisition times tailored to each frequency's requirements, ensuring high-frequency measurements get sufficient time without unnecessarily prolonging low-frequency measurements.
3Measurement precision
If data acquisition and analysis are repeated to improve frequency characteristics measurement accuracy, then measurement accuracy is improved, but measurement time becomes extremely long
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between frequency and optimal data acquisition time. The control unit uses this pre-established relationship to directly determine appropriate acquisition times without requiring repeated trials and adjustments, thereby achieving accurate measurements without extremely prolonged measurement time.
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 approach enables accurate frequency characteristics measurement in a shorter time, preventing prolonged measurement times and enhancing accuracy across all frequency regions.
Implementation Method 1
a spectrum analyzing unit configured to perform spectral analysis to the time-series data
Data Source
AI summary
A sinusoidal signal that is frequency-swept so as to have a frequency region in which each frequency has a different number of cycles and/or application duration is applied to a control system in a movement device that moves a movement target, time-series data for transmission characteristics obtained from said control system as a result of the application of the aforementioned sinusoidal signal is acquired, and said time-series data is subjected to spectral analysis. This allows the provision of a positioning control device and a frequency-characteristics measurement method that make it possible to optimize measuring precision while minimizing increases in the amount of time it takes to measure frequency characteristics.