Piezoelectric Sensor Mounting via Floating Play
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Solution Overview
Problem
Existing measurement systems with piezoelectric sensors face challenges in minimizing disturbance variables due to thermal expansion, unevenness, and positional tolerances of adjacent machine parts, which can affect the accuracy of moment and transverse force measurements.
Innovation Solution
The measurement elements are mechanically fixed with defined play in the through-openings of the measurement element receptacle, eliminating the need for welded or adhesive joints and elastic casting compounds. This floating mounting compensates for unevenness and positional tolerances, reducing the introduction of disturbance variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement elements are welded into the sensor holder, then the measurement elements are securely fixed, but disturbance variables are introduced into the measurement elements
Solution Approach 1:
The patent removes the welding process from the measurement system by using a through-opening design where measurement elements are inserted and fixed mechanically without welding. This extraction of the harmful welding process eliminates the introduction of disturbance variables while maintaining secure fixation through the receptacle structure.
Solution Approach 2:
The measurement element receptacle with its through-opening acts as an intermediary structure that holds the measurement elements without direct material bonding. The receptacle serves as a mediator between the measurement elements and the machine parts, providing mechanical fixation while isolating the measurement elements from harmful thermal and mechanical influences.
2Reliability
If measurement elements are fixed with welded or adhesive joints, then the measurement elements are securely held, but thermal expansion differences cause disturbance variables
Solution Approach 1:
The patent eliminates welded and adhesive joints by using a through-opening mechanical fixation system. This removal of bonding methods extracts the measurement elements from thermal influence zones, preventing thermal expansion differences between dissimilar materials from introducing disturbance variables into the measurement.
Solution Approach 2:
The receptacle with through-opening serves as a thermal intermediary, physically separating the measurement elements from the thermal environment of the machine parts. This intermediary structure allows mechanical fixation while minimizing thermal coupling, thus reducing thermal expansion effects on the measurement elements.
3Manufacturing precision
If measurement elements are installed with mechanical processing of the installation environment, then precise positioning is achieved, but installation complexity increases
Solution Approach 1:
The patent removes the need for mechanical processing of the installation environment by using a through-opening design that accepts measurement elements directly. This extraction of processing requirements maintains positioning accuracy through the receptacle's geometric constraints while significantly reducing installation complexity.
Solution Approach 2:
The measurement element receptacle is designed to be self-positioning through its through-opening geometry, which automatically aligns and secures the measurement elements without requiring external mechanical processing or adjustment. The system serves itself by using the receptacle's own structure to achieve precise positioning.
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 solution allows for accurate measurement of moments and transverse forces while minimizing the impact of thermal expansion and positional tolerances, enhancing the overall precision and reliability of the measurement system.
Implementation Method 1
at least one piezoelectric measurement element (10)
Data Source
AI summary
Various embodiments of the present disclosure are directed to a measurement system. In one example embodiment, a measurement system is disclosed including a flat measurement element receptacle and at least one piezoelectric measurement element. The flat measurement element receptacle having substantially parallel cover surfaces, and is installed between torque- and/or force-transmitting machine parts. The at least one piezoelectric measurement element arranged in a through-opening of the measurement element receptacle and mechanically fixed, with play, in the through-opening.