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To carry out 3-D (three dimensions) design for the group of piston crankshaft connecting rod, the top-down method is used. The group of piston crankshaft connecting rod is designed and each part is modeled in Pro/E. Pro/E is a solid modeler and this offers considerable advantage for solid model creation. Normally, the geometry is first sketched in 2-D and then extruded in the third direction to generate...
Through the research to the 3D-parking scheduling, bring forward the use of GAAA algorithm to search for the shortest path with shortest time in parking scheduling firstly, the GAAAA algorithm inosculate the Genetic Algorithm (GA) and Ant Algorithm (AA), which make up the shortcoming of GA and AA very well. Furthermore, through the simulation analysis proved that GAAA have better performance than...
In model-based diagnosis, a key step is to compute the minimal hitting sets (in brief, MHS) from the minimal conflict sets (in brief, MCS). Taking aim at the problem of existing algorithms, a new combined algorithm which can compute MHS was presented. The algorithm is consisted of three parts: the first part is to build a classified hitting sets tree (in brief, CHS-tree); the second part is the Recursive...
CMM (Coordinate Measuring Machine) is used as an accurate measuring instrument in manufacturing and design of products. High accurate CMM is required by the development of super-finish, micro-machinery, micro-electronic mechanical systems (MEMS). The precision of CMM is influenced by its volumetric error and dynamic error. The volumetric error is the major component during slowly probing, but the...
In order to control the section cutting of roadheader automatically, we establish the functional relationship of deflexion angle of cantilever, extension of hydraulic cylinder and position of cutting head. Before controlling roadheader to cut, the range of cutting section is set through the space coordinates, and the reference position of the cutting head should be established. Then we control the...
Basic characteristics of piezoelectric system shunted with negative capacitance are studied in this paper. After established general frequency domain equations of piezoelectric system shunted with negative capacitance, the expressions of natural frequency, dynamic stiffness and generalized electro-mechanical coupling factor are obtained. For the case there is only a negative capacitance in the shunting...
Virtual NC machine tool as an execution unit of virtual manufacturing is one of key technologies. The behavior simulation of NC machine tool based on virtual reality is a difficult problem for a long time. A hierarchy structure of NC behavior simulation was proposed. Firstly, the movement behavior of machine tool and behavior interactive model were analyzed in detail, and an even handle model based...
The channel characteristic of through-the-earth communication is calculated and simulated by Finite Difference Time Domain (FDTD) method. The reflection and transmission coefficients are obtained based on the different electric parameters in the channel. And the propagating characteristics of the layered earth in a loop antenna are investigated. The result can be served as a helpful guideline to design...
Research on circuit and control system of an environment-friendly equipment applied to hot-phosphating of the drill collar coupling screw thread has been carried out. In terms of the hot-phosphating processing, the functions and requirements of the control system of the equipment were established, which are the essential aim that we design the system. Accordingly, the designs and calculations to the...
This paper mainly focused on the theoretical studies of the linear rudder electric servo loading system. The mathematical model of motor servo loading system is established. Then, the disturbance force which would influence the system's dynamic performance is analyzed. In order to improve the accuracy of loading system, a feedforward-PID control algorithm is proposed. The algorithm can improve the...
A novel direct torque control strategy, using genetic algorithm on-line to optimize the fuzzy PI controller, is proposed. In this approach, according to speed error and its first time derivative, the proportional coefficient Kp and integral coefficient Ki can be on-line adjusted by fuzzy adaptive PI speed regulation, and the fuzzy logic adapter parameters are optimized by genetic algorithm to improve...
A distributed monitoring and diagnosis system to complex electromechanical equipments is researched and outlined. It includes three layers: monitoring units, bus communication and information processing and application system and it is constructed via BITBUS field bus and distributed network. Its software modules, including communication, monitoring, signal processing and fault diagnosis, have been...
Structure and principle of a new kind of diphase opposition giant magnetostrictive self-sensing actuator (SSA for short) is introduced, for which a kind of double outputs high-precision digital control stable voltage power is designed. With the method of combining with the hardware design and the software setting, the controllability and reliability of the actuator are greatly improved. And the whole...
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