摘要:Stress & displacement of the Yellow River truck frame is analysed with three dimensional solid element under three load conditions, the stress & displacement informatics is known under the gines conditions, In this basis, Improvements of the truck frame are discussed.
摘要:Based on the method of normal stiffness matnix along line of action of gear teeth a speciat purpose software for analysing tooth stiffness and load distribution has been provided by using 3-D FEM method. With this software, the instantaneous stiffness of gear tooth could be calculated for multitooth meshing. Stiffness curves under different meshing conditions were presented, and the results have been analysed through a working exam-ple.
摘要:Based on the analysis to necessity and urgency of development of new energy for vehicle use. This paper proposes that there are four "clean" fuels to choose: electric energy, methol, natural gas and hydrogen. The experienment shows that methol fuelled vehicle has most great potential to be used extensively in a near future if it is intended that the existing structure of vehicle be altered as little as possible.
摘要:Ion chromatography was applied to the determination of SeO32-. CrO42-. with 7. 5 mmol Na2CO3 and 2. 0mmol NaOH solution as an eluant. UV. detection at 254nm was selected. The standard deviation of this method was suitable. The collection ratio of SeO32-was 98%. CrO42- was 101%.
摘要:Corn starch as raw material is acidified by concentrated sulphuric acid to refine grape sugar. This article has made more overall lab studies concerning on the best condition of refining, the rate of regaining and the quality of product . It also has analysed and tested the quality of product systematically. Based on the above experiments, it has been turned out that the productive cycle of product and quality index compared with the information [1] is possible to use this lab method. It is simple to operate with short productive cycle and rate of output and quality farely improved. For the above mentioned features, this method is especially suitable for the rural enterprises to produce.
摘要:During normal operation of power system, the objective of reactive power/ voltage control is to supply secure and economic power. In emergency condition, the first objective is to operative security, secondary is economically. Concept of local network, calculation of sensitivity matrix of local network, gradation of severity of voltage violation and control strategies, the control actions are more fase and available. The approach is move suitable for cantrol of local network when complete network information is not available.
摘要:is This an artical we have primarily described how the operational amplifier of the high impedance and low drift apply in 5x10-5 A micro-current measurement. We also have described in detail and analysed important problems such as the principle of measurement in measurement circuit and relative error in measurement, circuit and analysed the limit sensitivity in measurement circuit.This measurement circuit has some advantages such as small in volume?short constant time, low drift and high precision so it is loiclely used.