Multifrequency excitation of a clamped–clamped microbeam: Analytical and experimental investigation

摘要

Tuning the resonance frequency of tiny oscillators enables ultrasensitive sensors that can be used in a broader range of applications. Micrometer-scale beams can vibrate, like strings on a guitar, at many different frequencies — known as modes. These modes are highly dependent on the physical properties of the oscillator, and so respond sensitively to mass, force or acceleration, for example. Mohammad Younis and his colleagues from the King Abdullah University of Science and Technology, Saudi Arabia, experimentally demonstrate and theoretically analyze the vibrations of an oscillating beam driven by two alternating current sources. The team tuned the resonant frequency and amplitude of their microbeam, made from a polymer coated by metal, by sweeping the frequency of one source while keeping the other constant. This enabled the device to be optimized for a particular use.