Velocity Of Slider Research Articles

Theoretical Analysis of Flying Characteristics for Air-Helium Filled HDD

This paper presents the flying characteristics of air-helium filled hard disk drive for a self-acting two rails flat slider bearing. Numerical scheme based on the finite difference with multi-grid multi-level technique were implemented for the ultra-low flying height sliders. The characteristics of air-helium filled HDD have been examined in this research work. The results shown that the change of flying height is significantly for various fraction of air-helium filled, at various operating conditions such as temperature velocity and mass of slider. Increase of velocity, flying height increase. Increase both the temperature and the mass load, flying height decrease. Increasing of fraction in helium gas, the flying height decreases rapidly for 40% to 60 % of fraction in helium filled. The flying height for air-helium filled magnetic flat slider head equal to 1.3 nm at trailing edge with mass load 12 mN and velocity 20 m/s. The spacing for helium filled hard disk drive is lower than 3 nm when compared with conventional air filled hard disk drive.

Dynamics Research of RRR-PRP Planar Six Bar Mechanism

For being convenient for researching the dynamic characteristic and the improvement and use of RRR-PRP planar six bar mechanism, for improving the dynamic technical performance, the three-dimensional solid model of the mechanism was established with ADAMS. Each part of the model in ADAMS was set up. Simulation analysis on the working process of the mechanism was achieved. The structure optimization parameters of the mechanism were obtained. The result proves that the vertical locations of two end points of rocker are almost no impact on the vertical velocity of slider. The location of block and the horizontal locations of two end points of crank and rocker have less impact on the vertical velocity and acceleration of slider. The vertical locations of two end points of crank have greater impact on the maximum vertical velocity and acceleration of slider.

Kinematics Simulation and Optimization for the Mechanism of 5R-P

This study first establishes a mathematical model of 5R-P kinematics with the closed-loop vector method, then the corresponding M functions are written, at the same time, the 5R-P kinematic simulation model is built by virtue of Matlab/Simulink. From the simulation, the displacement, velocity and acceleration curves of slider can be obtained on condition that the appropriate initial conditions are set beforehand. Finally, Taguchi method is introduced to this mechanism to optimize the design of each link’s length, and a more reasonable combination of each link’s length allows the 5R-P mechanism to perform better. Most kinds of complicated linkages can be commonly designed in this method, which is parametrized more efficiently. What is more important is that this method can also be introduced to deal with the dynamic analysis of the linkages for the purpose of carrying out a more comprehensive design and optimization.

Finite Element Simulation of Performance Characteristics of Infinitely Wide Plane Pad Slider Bearing

The paper describes the results of a numerical study using Galerkin’s finite element method on an infinitely wide slider bearing. The analysis is based upon the generalized Reynolds equation with the assumption that the pressure gradient in the lubricating film is negligible in the axial direction. Detailed results for bearing characteristics including pressure, load capacity, frictional force, frictional coefficient as a function of film thickness ratio (aspect ratio), and velocity of slider show that these parameters have a strong influence on the bearing behavior. Specifically, it has been shown that friction coefficient and frictional force increases with lower aspect ratios. Also, higher load carrying and maximum pressure is obtained with increased speed of the slider Point wise comparison of the results obtained using the Finite Element Method and that obtained with second order Finite Difference marching Method using base parameters show that the latter simulation has a maximum point wise error of 0.46% in comparison to 0.32% for Finite Element simulation. It has been shown that the Finite Element Method produces more accurate results. The results are in tabular and graphical forms.

Friction of a Steel Ball on a Single Crystal of Ice

Abstract This paper presents the results of a study carried out to explain the low friction on ice. Friction of a steel ball on a single crystal of ice was measured as a function of load, velocity, temperature, and diameter of slider. It was found that even when the velocity was very small (1.5 - 10-7 to 1.8-10–3 m/s) the coefficient of friction was very small ranging from 0.005 to 0.2, although friction on the prismatic plane was twice as large as that on the basal plane. The coefficient of friction increased with load, which means that Amonton’s classical law of friction is not applicable to ice. The coefficient of friction increased with decreasing velocity, which may result from the creep of ice in the contact area. The friction strongly increased as the temperature became close to °C. A minimum friction was observed for a definite temperature. It was found that the explanation of the results obtained is given satisfactorily neither by the classic pressure-melting theory nor by the friction-melting theory, but only by adhesion theory.

Friction of a Steel Ball on a Single Crystal of Ice

AbstractThis paper presents the results of a study carried out to explain the low friction on ice. Friction of a steel ball on a single crystal of ice was measured as a function of load, velocity, temperature, and diameter of slider. It was found that even when the velocity was very small (1.5 - 10-7 to 1.8-10–3 m/s) the coefficient of friction was very small ranging from 0.005 to 0.2, although friction on the prismatic plane was twice as large as that on the basal plane. The coefficient of friction increased with load, which means that Amonton’s classical law of friction is not applicable to ice. The coefficient of friction increased with decreasing velocity, which may result from the creep of ice in the contact area. The friction strongly increased as the temperature became close to °C. A minimum friction was observed for a definite temperature. It was found that the explanation of the results obtained is given satisfactorily neither by the classic pressure-melting theory nor by the friction-melting theory, but only by adhesion theory.