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A travelling wave ultrasonic by the clutch coupling longitudinal and bending vibration modes is proposed to improve the output performance of the current ultrasonic clutch. The proposed ultrasonic clutch mechanism is a crucial component and it mainly includes a driving friction plate, a slave friction plate, driving and slave Langevin transducers, driving and driven shafts. The proposed ultrasonic...
The screw-type ultrasonic motor was successfully used in fields of optical focusing system, medical instruments, and so on. In this paper, a cylindrical screw-type ultrasonic motor driven by six transducers is proposed. The motor mainly contains six fixed parts, twelve piezoelectric plates, six transducers, an elastomer and a screw shaft. The piezoelectric plates are bonded to the opposite outside...
A simulation model was developed to study the static characteristic of a regulator valve with large flow capacity. The regulator valve couples motion of double poppet valves with the shaft. Then a detailed theoretical model is carried out to explain working principle of the valve. And the simulation model is conducted based on that theoretical model. While simulating the established model, the damping...
To measure the three-dimensional morphologic parameters of proximal femurs and analyze the correlations between these parameters, as well as differences with the aging, which can provide the basic data and reference for the prediction of proximal femoral strength. 20 healthy males with no history of hip disease were selected, whose range of ages was 61-80. The proximal femur of each subject was scanned...
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