Applied Mechanics and Materials Vols. 121-126

Abstract: By means of FEM using ANSYS, this paper set up a three–dimensional model by using Pro/E for model S195 diesel engine’s crankshaft corresponding to practical conditions . The distortion and stress of the crankshaft was investigated . The fatigue strength of crankshaft was verified under changing load . The rationality of crank stress analysis method, which is in current widely used, was discussed . The model analysis was made for the crankshaft , and provide the valuable theory basis for engine design optimizing and improving .

Abstract: In machining, it often encounters milling large inclined holes with spindle on unvertical space. On 3 axis coordinated NC boring-milling machine, universal Angular milling head for changing spindle direction is adopted to align hole axis with milling cutter axis, using geometrical space establishes mathematical model between each processing variables to realize NC program parameterization of space inclined hole milling. Results show that the work piece only need chucking once, give the relevant variable values, can be completed holes, processing high accuracy, saving labor and power, and it also can be extended to machine similar space bevel surface and tilt slot.

Abstract: This document describes a simple industrial clamping device composed of hinges and a lever in series with, and driven by, a geared stepping motor. The principle of operation and technical characteristics are illustrated, and the clamping force is calculated. The advantages of this innovation are 1) reconfigurable, though adjustment of its levers’ position for clamping different sized work pieces ; 2) environmental conservation, Compared to the hydraulic clamping device and air cylinder clamping device, it has less noises, needs less energy and no pollution.

Abstract: The paper briefly looks back on current research situation of home service robots. It takes a home nursing robot as example to study and discuss some key generic technologies of home service robots. It generally overviewed robot’s mobile platform technology, modular design, reconfigurable robot technique, motion control, sensor technologies, indoor robot’s navigation and localization technology indoor, intelligentization, and robot’s technology standardization. Some the measures of technology standardization of home service robots have been put forward. It has realistic signification for industrialization of home service robots.

Abstract: This paper deal with an analysis of impact of climate conditions on field reliability of vehicles. Two case studies are presented. One case study deals with four heavy vehicles used in a steel mill in Guangzhou, China; and the other deals with 22 buses operated in Changsha, China. The field reliability is measured by monthly average MTBF; the climate conditions are described by monthly average temperature, monthly average relative humidity, and monthly average rainfall. The influence of these variables on the reliability of the vehicles is quantitatively analyzed. It is concluded that the climate conditions have a significant influence on the reliability of the vehicles and the influence can be different in different sites. The analysis is useful for the operational and maintenance management of the vehicles.

Abstract: A successful ultra fast cooling (UFC) technology has been applied to the plate rolling production line in Shouqin Metal Materials Co.Ltd.. Industrial trials are reported for the production of X70 pipeline steels (about 70000 t) under UFC conditions. Pipeline steels with reasonably good properties have been produced on an industrial scale. UFC improves the temperature uniformity, the mechanical properties and the plate profile of X70 pipeline steel. The impact values of X70 pipeline steel at UFC mode exceed the standard requirements of X80 pipeline steel. The productivity is enhanced because cutting quantity of head and tail of the plate is reduced. The enhancement of control accuracy of the red back temperatures is favorable for industrial production of X70 pipeline steel. The reduced production of the steel-making has been industrialized achieved, since a new composition was designed by reducing the vanadium content to less than 0.045wt.%.

Abstract: Resistance spot welding (RSW) is being taken place by partial lap laser welding for the poor surface quality and bad airtight due to the pressure of electrodes. The shape of partial lap laser welding is similar to the vase. When the penetration of the joint is in a certain range, there is no welding trace on the outer surface. Laser welding temperature field numerical analysis based on Abaqus finite element analysis software is committed to obtain a suitable range of process parameters to improve production efficiency and automation by determining the joint penetration. To master the laser lap welding of stainless steel weld penetration state, the combination of three-dimensional positive cone + three-dimensional inverted cone + half-ellipsoid heat source model was established simulating stainless steel lap laser weld pool shape and forecasting the range of process parameters .

Abstract: Simulation and analysis of steady and 2D flow field by using ANSYS8.0 and getting the press and velocity contour. omulate the leakage. then through comparison and analysis offering theory evidence for controlling leakage effectively.

Abstract: To achieve an agile and accurate motor control performance on coal mine detection robots TUT-CMDR, Fuzzy-PID control and its model building method in the Simulink environment are explored. The transfer function model of the TUT-CMDR motor transmission system is established and M-files used to ascertain the gain of the PID control are compiled. The final value of the step block is configured to a variable and parameterized quantization factors and scaling factors are proposed to solve the problem of different basic universe for different final value. Some improvement is also made on the existing fuzzy control rules. Finally, the designed controller is proved to show a better control performance.

Abstract: At present, the mines in our country gradually shift from the shallow mining to the deep mining, but the deep well floor is particularly serious hazard by high pressure underground water.This article considers the high pressure underground water as three-dimensional transient flow, sets up mechanical model by combining mechanical knowledge and to analyze the destructive action on floor from two aspects. On the one hand, researching the impact destruction of high pressure water at different positions of floor ; the other hand, to analyze mechanical function on fracture development from high pressure water.