Magnetostrictive Strain Detection in Elastomeric Products
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Solution Overview
Problem
Existing methods for measuring strain in elastomeric products, such as drive belts and tires, face challenges due to high elasticity leading to sound wave absorption and the need for direct contact, which limits their application to moving products and increases costs with electronic sensors.
Innovation Solution
A system utilizing a magnetostrictive body with mechanical resonance frequencies, excited by an alternating electromagnetic field, allows for non-contact strain measurement by detecting frequency deviations in mechanical vibrations, reducing the need for electronics on the product and minimizing material interactions that could cause chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic waves are used to measure strain in elastomeric products, then measurement capability is achieved, but the method cannot be applied due to high sound wave absorption in elastomeric materials
Solution Approach 1:
The patent replaces the ultrasonic mechanical wave-based measurement system with an optical measurement system. Instead of using piezoelectric crystals to generate and detect ultrasonic waves, the invention uses optical methods to measure strain in elastomeric products, thereby avoiding the problem of sound wave absorption in these materials.
Solution Approach 2:
The patent changes the measurement parameter from acoustic wave propagation time to optical path length changes. By using optical methods instead of ultrasonic waves, the system can measure strain without being affected by the high absorption characteristics of elastomeric materials to acoustic waves.
2Measurement precision
If contact-based ultrasonic measurement is used, then strain detection is possible, but the method cannot be applied to moving products due to requirement for direct contact
Solution Approach 1:
The patent replaces the contact-based ultrasonic measurement system with a non-contact optical measurement system. By using optical methods, the system can measure strain in moving elastomeric products without requiring physical contact, thereby enabling measurement in dynamic applications.
3Ease of operation
If optical methods with reference markings are used for non-contact measurement, then applicability to moving products is improved, but measurement accuracy is impaired by environmental influences such as dirt, oil, moisture, dust, and smoke
Solution Approach 1:
The patent changes the measurement approach by using optical methods that are less sensitive to environmental contaminants. The system measures strain through optical path length changes in a manner that maintains accuracy even in the presence of dirt, oil, moisture, dust, and smoke, thereby resolving the contradiction between non-contact capability and measurement precision.
4Measurement precision
If electronic sensors such as strain gauges are applied to elastomeric products, then measurement precision is improved, but device complexity and cost increase due to required electronics and communication systems
Solution Approach 1:
The patent replaces electronic sensor systems with an optical measurement system. By using optical methods instead of strain gauges and associated electronics, the invention achieves strain measurement capability while significantly reducing device complexity and eliminating the need for communication systems between sensors and external devices.
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 accurate, cost-effective, and non-contact strain measurement in elastomeric products without the limitations of sound wave absorption and electronic sensor vulnerabilities, suitable for both stationary and moving elastomeric products.
Implementation Method 1
a sensor element, which is arranged at a distance from the elastomeric product and sufficiently close to the magnetostrictive body of the product body and is designed to excite the magnetostrictive body to mechanical oscillations by means of an inductive electromagnetic alternating field
Implementation Method 2
The magnetostrictive body has at least one mechanical resonance frequency, i.e. the magnetostrictive body is excited by mechanical vibrations of at least one predetermined frequency to a mechanical vibration resonance
Implementation Method 3
the system is designed, based at least on a deviation between the resonant frequency of the magnetostrictive body and the detected frequency of the mechanical vibration of the magnetostrictive body to detect and/or determine a stretching of the product body
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a system for strain detection of an elastomeric product (1) comprising a product body (10) which has at least substantially an elastomeric material, wherein the product body (10) has at least partially at least one magnetostrictive body (13), wherein the magnetostrictive body (13) has at least one mechanical resonance frequency, and comprising at least one sensor element (2) which is spaced apart from the elastomeric product (1) and sufficiently close to the magnetostrictive body (13) of the product body (10) and is configured to excite the magnetostrictive body (13) to mechanical vibrations by means of an alternating electromagnetic excitation field and to detect the frequency of the mechanical vibrations of the magnetostrictive body (13) by means of an alternating electromagnetic measuring field, wherein the system is configuredbased at least on a deviation between the resonance frequency of the magnetostrictive body (13) and the detected frequency of the mechanical vibration of the magnetostrictive body (13), to detect and/or determine a strain of the product body (10),