Linear Guideway Preload Estimation via Vibration Analysis
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Solution Overview
Problem
Conventional methods for estimating preload variations in linear guideways of machine tools are time-consuming and inconvenient, requiring frequent removal and measurement, which is not practical for monitoring wear and tear.
Innovation Solution
Implementing a method using vibration sensors and a computation module to detect natural frequencies and variations in preload without removing the linear guideway, allowing continuous monitoring within the machine tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the linear guideway is removed from the machine tool for measurement, then the preload can be measured by a measuring tool, but the monitoring process becomes time-consuming and inconvenient
Solution Approach 1:
The patent replaces the mechanical measurement system (requiring physical removal and contact measurement tools) with a vibration-based measurement system. Vibration sensors mounted on the machine tool table detect natural frequencies of the guideway, which are then used to calculate preload variations. This substitution eliminates the need to remove the guideway for measurement while maintaining measurement capability.
Solution Approach 2:
The patent introduces vibration sensors as an intermediary element between the guideway and the measurement process. These sensors detect vibrations of the guideway indirectly, and through signal processing and natural frequency analysis, derive preload information without direct contact or removal of the guideway. The intermediary sensors enable non-intrusive monitoring.
2Reliability
If the linear guideway is removed regularly for repeated measurements, then the variation in preload can be monitored, but the operation becomes inconvenient and reduces productivity
Solution Approach 1:
The patent enables continuous monitoring of preload variations by keeping the vibration sensors mounted on the machine tool table throughout operation. The system continuously captures vibration signals and processes them to detect changes in natural frequencies, providing ongoing preload monitoring without interrupting machine tool operation or requiring repeated removal and reinstallation of the guideway.
Solution Approach 2:
The machine tool system performs self-diagnosis through the vibration monitoring system. The computation module automatically processes vibration signals, determines natural frequencies, and calculates preload variations without requiring external intervention or manual measurement operations. The system monitors its own guideway condition continuously during normal operation.
3Measurement precision
If conventional measurement methods are used, then preload can be measured accurately, but the process requires disassembly and is not practical for continuous monitoring
Solution Approach 1:
The patent replaces the mechanical disassembly-based measurement approach with a vibration-based indirect measurement system. By measuring natural frequencies through vibration sensors and using computational analysis to derive preload values, the system achieves measurement capability without mechanical removal or disassembly operations, greatly improving ease of operation.
Solution Approach 2:
The vibration sensors serve as intermediaries that enable measurement without direct contact or removal of the guideway. The sensors detect vibrational characteristics that correlate with preload conditions, and through signal processing, provide accurate preload information in a convenient, non-intrusive manner.
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
Enables continuous estimation of preload variations without disassembly, providing timely insights into wear and tear, thus improving efficiency and reducing downtime.
Implementation Method 1
obtaining, via each of the plurality of vibration sensors, a first vibration signal that is generated according to detection of vibration of the table by the vibration sensor
Data Source
AI summary
A method for estimating a variation in a preload applied to a linear guideway of a machine tool includes steps of: a) obtaining, via each of vibration sensors, first and second vibration signals that are generated according to detection of vibration of a table disposed on the linear guideway respectively at first and second time instants; b) determining, via the computation module, first and second natural frequencies based on a theoretical mode shape and respectively on the first and second vibration signals; and c) determining, via the computation module, the variation in the preload based on the first and second natural frequencies.