Abstract
In this work the application of a self-sensing and self-actuating cantilever for gas-flow measurement is investigated. The cantilever placed in the flow is excited permanently at its first resonance mode. Simultaneously the resonance amplitude, the resonance frequency and the static bending of the cantilever are detected. All three sizes are related to the velocity of the gas-flow.
Highlights
Flow sensors are widely used in industry, laboratories, medicine and home
The resonance amplitude is attenuated with increasing flow velocity and the resonance frequency is slightly shifted to higher values
The 1st term describes the flow force that causes the static bending of the cantilever
Summary
Flow sensors are widely used in industry, laboratories, medicine and home. Frequently used mass flow measurement principles are based on thermal conductivity of the gas, float-style, Coriolis force, vortex shedding and differential pressure. The cantilever is bent by the flow forces (here called - static operating mode) and secondly its resonance behavior is changed (dynamic operating mode). In the static operating mode, the bending is proportional to the square of the gas-flow velocity. The resonance amplitude is attenuated with increasing flow velocity and the resonance frequency is slightly shifted to higher values.
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