ON-OFF Valve Stem Position Calibration Using Mechanical Vibration
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Solution Overview
Problem
Existing position measurement methods that convert acceleration or angular velocity into position information for ON-OFF valves suffer from significant measurement errors due to accumulation of minute errors and noise, making it difficult to ensure the reliability of diagnostic systems without additional calibration methods.
Innovation Solution
A position measuring device and method that incorporates a first sensor to measure acceleration or angular velocity, a second sensor to detect mechanical vibration, a reference position specification part to store reference position information, and a calibration processing part to reduce measurement errors by using the detected vibration as a reference for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If acceleration or angular velocity is integrated to obtain position information, then position measurement can be achieved without additional hardware, but position measurement errors accumulate due to minute errors and noise
Solution Approach 1:
The system performs preliminary calibration by detecting mechanical vibration occurrences and storing them as reference positions before normal measurement. This pre-established reference framework allows subsequent error correction without requiring additional hardware or complex installation procedures.
Solution Approach 2:
The system continuously monitors position information against stored reference positions derived from mechanical vibration events. When deviations are detected, the system uses feedback mechanisms to correct accumulated errors by referencing the known accurate positions where vibrations occurred.
2Measurement precision
If calibration is performed by attaching another device to a position other than the valve stem, then position measurement errors can be reduced, but device complexity increases due to additional hardware and installation difficulty
Solution Approach 1:
The system uses the measurement target itself (the valve stem with attached acceleration sensor) to generate the calibration reference points through its own mechanical vibrations. The vibration sensor detects these self-generated vibrations, and the system automatically stores the corresponding position information as reference data, eliminating the need for external calibration devices or additional attachment points.
Solution Approach 2:
The system discards the problematic accumulated integration errors by resetting to known accurate positions identified through mechanical vibration detection. Instead of continuously carrying forward erroneous cumulative values, the system recovers accuracy by periodically anchoring measurements to freshly identified reference positions where vibrations indicate precise location.
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
The solution effectively reduces position measurement errors by utilizing reproducible mechanical vibrations as reference points for calibration, enhancing the reliability of diagnostic systems without the need for additional hardware or signal lines.
Implementation Method 1
a first sensor, configured to measure acceleration or angular velocity of a measurement target
Implementation Method 2
a second sensor, configured to detect mechanical vibration generated in association with movement of the measurement target
Implementation Method 3
a position information generation part, configured to integrate the acceleration or the angular velocity with respect to time and convert the acceleration or the angular velocity into position information
Data Source
AI summary
A position measuring device includes: a first sensor, measuring acceleration or angular velocity of a valve stem of an ON-OFF valve; a position information generation part, integrating the acceleration or angular velocity measured by the first sensor and converting the acceleration or angular velocity into position information; a second sensor, detecting mechanical vibration generated in association with opening and closing of the ON-OFF valve; a reference position specification part, pre-storing, as reference position information, position information when vibration is detected by the second sensor; and a calibration processing part, when vibration is detected by the second sensor, executing calibration processing to reduce position measurement errors based on the position information obtained by the position information generation part and the reference position information.