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Experiments have been carried out on a clamped transducer system with electrical resistance loads and a transducer-horn system with water loads. The results show that the distributions of the vibration velocity amplitude of a Langevin-type vibration system change with loads and the wattmeter method implies certain theoretical errors. However, under light load conditions (< ρ VS) the error is small...
The vibrational amplitude ratios of a number of positions in some typical vibration systems under different loads, especially of amplitudes at positions close to nodes and anti-nodes (related to no-load conditions) are given. Results according to the wattmeter method for measuring output acoustical power and electro-acoustic efficiency of high-power ultrasonic vibration systems (Langevin-type transducers...
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