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This letter investigates the effect of the surface texture of soft deformable fingertips on the maximum resistible force under dry and wet conditions, and proposes a new hybrid structure that provides a stable grasp under both conditions. One definition of stable grasp is the capability of balancing a large external force or moment while grasping. For soft fingertips, both the friction and surface...
The effects of centrifugal force of oil distribution mechanism in lubrication system at high speed will impact the performance of effective flow area, and change the inflow of lubricating oil. It is needed to study the flow field characteristics inside the oil distribution mechanism. First of all, the theoretical research has been studied on it, and the theoretical flow model of oil distribution mechanism...
This paper presents a new modeling approach for studying the oil film characteristics between the ring gear and the case in internal gear machines. In traditional research, the assembly relationship of ring gear and case bore was considered as an ideal cylindrical pair, and the micro motion of ring gear and its influence on oil film height and pressure had not been discussed yet. However, wedge oil...
The sealing ring, as the rotary sealing devices, are one of the most important components in the wet clutch unit of a heavy load vehicle, whereas the failure of the rings occurred only after a service of about several months. So it is necessary to investigate the wear mechanism and failure cause of sealing rings in order to provide the essential evidence and critical feedback into the design process...
To reduce environmental loads caused by full usage of cutting fluids, nano-fluids, mixtures of nano-scale particles and base fluids, have recently been applied to mechanical machining processes with minimum quantity lubrication (MQL) approach. This paper discusses the characteristics of nano-fluid MQL meso-scale grinding process in the miniaturized machine tool system that can significantly save energy...
The lateral vibration of the high-speed rotation slice-disk is controlled using the hydrodynamic film and the control of the disk was studied by the finite element method and the experimental measurement. The slice-disk was meshed by elements of the fan-shaped grid. A dynamic equation of the rotation disk was established by the Lagrange equation and the theory of the hydrodynamic lubrication. The...
Tribology is the science of friction and wear. In tribology, long effort has been devoted to the study of the physics and dynamics of friction. Controls is concerned with the dynamics of servo machines, but the friction models used for controls analysis are often very basic. This paper presents a brief outline of tribological results important for control.
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