Servo Frequency Response Measurement Across Split Resonance Bands

Solution Overview

Problem

Accurate measurement of a servo system's frequency response is hindered by the excitation of unnecessary resonance frequencies, particularly due to the influence of anti-resonance frequencies, which can lead to incorrect gain calculations and hinder suitable use of the frequency response.

Innovation Solution

A measurement device that divides the frequency range into separate ranges including the resonance and anti-resonance frequencies, calculates each frequency response, and synthesizes the results to exclude the influence of anti-resonance frequency excitation, using an oscillation executor, identifier, calculator, and synthesizer to identify and process specific oscillation and response signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If oscillation at resonance frequency is applied to measure frequency response, then the frequency response can be obtained, but unnecessary resonance frequency excitation occurs due to anti-resonance frequency influence, causing measurement inaccuracy

Engineering Contradiction:

Improvefrequency response measurement accuracyVSAvoidunnecessary resonance frequency excitation

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The frequency range is divided into multiple bands, with each band containing either the resonance frequency or the anti-resonance frequency but not both. This segmentation prevents the excitation of unnecessary resonance frequencies when measuring at anti-resonance frequencies, thereby improving measurement accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The harmful influence of anti-resonance frequency excitation is extracted and isolated by creating separate frequency bands. The band including the anti-resonance frequency is separated from the band including the resonance frequency, allowing the harmful effect to be excluded from the resonance frequency measurement.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If the frequency range is divided into multiple bands to exclude anti-resonance influence, then measurement accuracy improves, but the measurement process and calculation become more complex

Engineering Contradiction:

Improvefrequency response measurement accuracyVSAvoidmeasurement and calculation process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The frequency range is divided into multiple bands, with each band containing either the resonance frequency or the anti-resonance frequency but not both. This segmentation prevents the excitation of unnecessary resonance frequencies when measuring at anti-resonance frequencies, thereby improving measurement accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Frequency response is measured separately for each divided band, creating multiple partial frequency response characteristics. These partial characteristics are then synthesized to form the complete frequency response, allowing accurate measurement while managing complexity through systematic processing.

Inventive Principle:

Principle #26Copying

3Measurement precision

If frequency response is measured in divided bands and synthesized, then anti-resonance frequency influence is excluded, but measurement time increases due to multiple measurements

Engineering Contradiction:

Improvefrequency response measurement accuracyVSAvoidmeasurement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The frequency range is divided into multiple bands, with each band containing either the resonance frequency or the anti-resonance frequency but not both. This segmentation prevents the excitation of unnecessary resonance frequencies when measuring at anti-resonance frequencies, thereby improving measurement accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The frequency response measurement is performed continuously across all divided bands without interruption. The oscillation application signal is applied across the entire frequency range, and the frequency response is measured continuously for each band, then synthesized to produce the complete frequency response characteristic.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS12147211B2Control device

Publication Date: 2024.11.19 OMRON CORP

AI summary

A measurement device measures a frequency response of a servo system, applies predetermined oscillation are associated with each other to the servo system, identifies, from a result of oscillation application, a pair of a first oscillation application signal and a first response signal, and identifies a pair of a second oscillation application signal and a second response signal. Then, a first frequency response that is a frequency response is calculated on the basis of the first oscillation application signal and the first response signal, a second frequency response that is a frequency response is calculated on the basis of the second oscillation application signal and the second response signal, and the first frequency response and the second frequency response are synthesized.