Current Issue : July - September Volume : 2020 Issue Number : 3 Articles : 5 Articles
Spur gears are widely used transmission components. In the traditional design process, the noninvolute part of the tooth profile\ncurve is difficult to describe with mathematical equations. This article puts forward a new parametric modeling method, which can\ndescribe the modified involute part of spur gears and parameterize and optimize the transition part of the involute curve of the\nspur gear. And this model of the spur gear can be created by parameters which is input in Scilab software and the spur gear graphic\ncan be completed correspondingly. The experiments show that this modeling method can more quickly produce the standard spur\nor modified spur gear, and it also improves the efficiency and accuracy of spur gear modeling....
The automated mechanical transmission (AMT) based on the electromagnetic linear driving device (EMLDD) has good potential\nfor shift performance. However, the direct-drive shifting mechanism based on the displacement sensor is difficult to meet the\ncompactness of the structure and control robustness in complex environment. Through analyzing the working principle of the\nelectromagnetic linear driving device and features of sensorless control strategy, a new displacement prediction method based on\nthe improved GA-BP neural network is proposed to replace the displacement sensor. With current, voltage, and input shaft speed\nof the electromagnetic linear driving device as input, displacement prediction is obtained by the GA-BP neural network with\nimproved selection factor......................................
Laser processing is a rapidly growing key technology driven by several advantages such \nas cost and performance.........................
The current study performs an explicit nonlinear finite element simulation to predict temperature distribution and consequent\nstresses during the friction stir welding (FSW) of AA 7075-T651 alloy............................
Fatigue crack growth tests were carried out on the SEN B3 precracked specimens,\nwith dimensions in accordance with ISO 12108 requirements. The specimens\nwere made of martensitic stainless steel, X17CrNi15-2, and some of\nthem were modified by the ceramic coating deposition surface treatment. The\neffects of ceramic coating, on the fatigue crack growth behaviour of hollow\nshaft specimens,...........................
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