A friction-variable touch panel is capable of presenting virtual bumps and holes on its flat surface through the control of the surface frictionwhen a fingertip slides over it. To improve thepresentation, we developed a friction model of a fingertip sliding over a sinusoidal surface with an amplitude of 0.5–2.5mm and a spatial wavelength of 20–50mm. When a metal ball rolls over a wavy surface w...

In this note, we determine the stability boundary for the thermoelastic contact of a rectangular elastic block sliding against a rigid wall in the presence of a pressure-dependent thermal contact resistance. This geometry can be seen as intermediate between the idealized ‘Aldo’ rod model and continuum solutions for the elastic half-plane. The solution is obtained by comparing the expression for...

Sliding mode control has been used extensively in robotics to cope with parametric uncertainty and hard nonlinearities, in particular for timedelay teleoperators, which have gained gradual acceptance due to technological advancements. However, since the slave teleoperator is in contact with a rigid environment, the slave controller requires a free of chattering control strategy, thus making fir...

A novel robust control law with finite time convergence for rigid robotic manipulators is proposed in this paper. The whole control process is divided into two phases, i.e., the error correction phase and the steady tracking phase. Firstly, a novel time-varying sliding mode control (TVSMC) method is developed in the first phase to ensure the tracking error converge to zero at the desired time. ...

We study the lubricated sliding of a rigid cylinder on viscoelastic half space with single characteristic retardation time. Besides generalized inverse Hersey number $$\beta$$ , which is sole parameter governing elastic lubrication, lubrication solution depends two additional dimensionless parameters: $$\alpha$$ and $$f$$ . time divided by for to move one contact width f determines strength vis...

To investigate the seismic behavior of end-plate connection semi-rigid space steel frames, three 1/4-scale specimens were tested under cyclic load. Finite element analysis which took initial geometric imperfections into consideration was also conducted, and the results conform to experimental results. The failure modes, hysteretic behavior, deformation capacity and energy-dissipation capacity o...