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The effect of ultrasonic friction reduction (UFR) has been found for a few decades and been applied in a series of fields, like mechanical design and manufacturing. Meanwhile it has also been successfully involved in pneumatic cylinders of pneumatic field. This research proposed an equivalent method for the seal-cylinder couple to be unfolded into a rubber bar-steel plate friction couple, in order...
This paper utilizes the method of adding a mass source and a damping term into the fluid governing equation for generating and absorbing the second order stokes wave. A nonlinear mathematic model for a raft-type wave energy converter with three floaters is proposed based on the Lagrange formulation. A number of simulations are accomplished in CFD software by numerically solving the non-linear mathematical...
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...
Pneumatic piston-cylinder actuators are widely applied in industry for a variety of automation and robotics field. For suppressing leakage, these actuators incorporate seal rings which meanwhile introduce friction and affect the positioning precision and output force. The friction reduction by ultrasonic vibration has got wide and deep investigations by global researchers, and been successfully implemented...
Hydraulic power conversion system is widely used as a power take-off system in wave energy converters to realize the aim that transforms wave energy into hydraulic energy. The efficiency of transformation is an interesting research topic which attracts many researchers' attention. In this paper, a control strategy through combining hydraulic cylinders is proposed for improving the efficiency of transformation...
The nonlinear primary resonances of a pneumatic spring with simple harmonic excitations were studied by the method of nonlinear dynamics. Through testing, load curve of the pneumatic spring under a certain initial pressure was got. According to the test data, the relative elastic force was fitted to relative displacement by cube polynomial equation. The method of multiple scales was used to solve...
Recent advances have led to the emergence of molecular biomechanics as an essential element of modern biology. These efforts focus on theoretical and experimental studies of the mechanics of proteins and nucleic acids, and the understanding of the molecular mechanisms of stress transmission, mechanosensing and mechanotransduction in living cells. In particular, single-molecule biomechanics studies...
A humanoid robot should be able to keep balance under unexpected disturbance, and can take three strategies, i.e. ankle strategy, hip strategy and step strategy, to recover balance from biomechanics research. In this paper, the relationship between limited joint torque and balance recovery strategy is analyzed using Zero moment Point Manipulability Ellipsoid. Furthermore, during balance control, the...
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