Wireless Sensor Delay Correction for Vibration Suppression
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Solution Overview
Problem
Existing machine systems with wireless sensors at the tip parts of machine tools or robots face challenges in accurately suppressing vibrations due to signal transmission delays, as they do not account for the delay in sensor signal transmission.
Innovation Solution
A machine system that includes a movable member driven by a motor, a control device, a sensor unit for detecting position, speed, or acceleration, a wireless signal path for transmitting sensor signals, a data acquisition unit for acquiring first time-series data, a data calculation unit for calculating second time-series data based on motor commands, a delay time calculation unit to determine the delay time based on correlation between the two datasets, and a correction unit to adjust the first time-series data to match the second time-series data, thereby correcting for signal delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless sensor is used to detect vibration at tip part, then vibration suppression can be implemented, but signal transmission delay occurs making accurate vibration suppression difficult
Solution Approach 1:
The patent calculates the delay time in advance by comparing the timing relationship between motor driving commands and sensor detection results, then uses this pre-calculated delay time to correct the sensor signal timing before feeding it back to the controller. This preliminary correction action eliminates the harmful effect of wireless transmission delay on vibration suppression accuracy.
2Ease of operation
If wireless communication is used for sensor signal transmission, then installation flexibility is improved, but transmission delay causes deterioration in control precision
Solution Approach 1:
The patent creates a corrected copy of the sensor signal by generating a timing-corrected version of the vibration data using the calculated delay time. This corrected signal copy maintains the benefits of wireless transmission while eliminating the timing error, allowing precise vibration suppression control.
Data Source
AI summary
A machine system including a sensor unit detecting periodically an acceleration at a tip part of a movable member, a data acquisition unit acquiring first time-series data of the acceleration at the tip part of the movable member corresponding to sensor signal received via a wireless signal path, a data calculation unit configured to calculate second time-series data corresponding to the first time-series data based on a driving command of the motor, a delay time calculation unit calculating a delay time of the first time-series data with respect to the second time-series data according to a degree of correlation between first time-series data and the second time-series data, and a correction unit correcting the first time-series data based on the delay time.