Electromagnetic Actuator for Brake Pad Natural Frequency Testing
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Solution Overview
Problem
Existing methods for determining the natural frequency and modal damping of components, such as brake pads, are complex and costly, making it difficult to implement in large-scale production lines, and often result in random sampling rather than comprehensive testing, with moving parts in impact actuators being prone to failure.
Innovation Solution
A device using an electromagnetic actuator with a magnetic force of attraction to impart a force impulse to the test specimen, allowing it to vibrate freely without suspension or damping, enabling quick and cost-effective determination of natural frequencies in a production line setting, eliminating the need for moving parts and allowing 100% of components to be tested.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional impact hammers with moving parts are used to excite test specimens, then the test specimen can be excited to determine natural frequencies, but the moving parts are prone to failure and the device complexity increases
Solution Approach 1:
The patent replaces the mechanical impact hammer system with moving parts with an electromagnetic actuator system. The electromagnetic actuator uses magnetic fields to apply impulsive forces to the test specimen without mechanical contact or moving parts, thereby eliminating wear and failure modes associated with mechanical components while reducing overall device complexity.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the actuator and the test specimen. The electromagnetic actuator generates a magnetic field that interacts with a ferromagnetic element on the specimen surface, transmitting force impulsively without direct mechanical contact, thus avoiding the reliability issues of mechanical impact hammers.
2Measurement precision
If compression analysis based on random sampling is used, then the compressibility parameter can be measured, but the testing process becomes very expensive and complicated for large production lines
Solution Approach 1:
The patent uses mechanical vibration excitation through the electromagnetic actuator to determine natural frequencies and modal damping of components. This vibration-based method provides precise mechanical property measurements while being rapidly executable, enabling 100% inspection on production lines rather than random sampling, thus resolving the contradiction between measurement precision and productivity.
Solution Approach 2:
The patent changes the measurement parameter from compression analysis to natural frequency and modal damping measurement. This parameter change enables faster, more automated testing that can be performed on every component in a production line without the complexity and cost associated with traditional compression analysis, thereby improving both measurement precision and productivity.
3Measurement precision
If the test specimen is suspended or placed on foam pads to achieve free vibration, then the natural frequency can be accurately measured, but the device complexity and setup time increase
Solution Approach 1:
The patent extracts and eliminates the suspension system (foam pads or other damping-free mounting mechanisms) from the testing apparatus. By using the electromagnetic actuator to apply impulsive forces directly to the specimen while it rests on a simple support surface, the method achieves accurate natural frequency measurement without the complexity of suspension systems, as the impulsive excitation momentarily isolates the specimen dynamically.
4Reliability
If modal analysis is performed on every component in large-scale production, then 100% of components can be tested, but the testing process becomes too complex and costly to implement
Solution Approach 1:
The patent replaces complex mechanical testing systems with an electromagnetic actuator-based modal analysis system. This substitution enables rapid, automated testing that can be integrated into production lines for 100% component inspection without the complexity and cost prohibitions of traditional mechanical impact hammer methods, thereby achieving comprehensive quality control coverage.
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 reliable and efficient determination of natural frequencies and damping in all components during production, improving automation and standardization of modal testing, reducing costs and extending device lifespan by eliminating the need for complex suspension systems and random sampling.
Implementation Method 1
an electromagnetic actuator, especially an electromagnet, is provided for exerting a magnetic force of attraction onto the test specimen so that the actuator exerts a force impulse that imparts the test specimen with vibrations
Data Source
AI summary
The invention relates to a device for ascertaining mechanical properties, for example, the natural frequency, the damping or the natural vibration mode of a test specimen containing ferromagnetic material components, in particular a brake pad for a motor vehicle. An electromagnetic actuator, in particular an electromagnet, is provided for exerting a magnetic attractive force onto the test specimen so that the actuator exerts a force impulse that imparts the test specimen with vibrations whose spectrum of vibration contains at least one natural frequency vibration of the test specimen.