Vibration frequency measurement using a local multithreshold technique

Area of Science:

• Mechanical Engineering
• Optics and Photonics
• Signal Processing

Background:

• Vibration analysis is crucial for structural health monitoring and performance assessment.
• Traditional methods often require specialized equipment, limiting accessibility.
• Non-contact measurement techniques are desirable for safety and convenience.

Purpose of the Study:

• To introduce a cost-effective, non-contact method for measuring vibration frequencies.
• To demonstrate the efficacy of a video camera-based approach for vibration analysis.
• To validate the accuracy and robustness of the proposed technique.

Main Methods:

• Utilizing image acquisition and multilevel thresholding for vibration analysis.
• Employing a standard video camera with a sufficient acquisition rate.
• Analyzing low-resolution videos with AVI-JPEG compression.

Main Results:

• Successfully measured vibration modes of a tuning fork, loudspeaker, and bridge.
• Demonstrated accurate frequency measurements despite low resolution and noise.
• Validated results against design parameters and alternative measurement devices.

Conclusions:

• The proposed video camera-based method offers an accurate and robust solution for vibration frequency measurement.
• This technique is versatile, applicable to various objects and vibration directions.
• It provides a low-cost, accessible alternative to conventional vibration analysis tools.