To implement quantificational evaluation for a mechanical kinematical scheme effectively, a multi-level and multi-objective evaluating model was established by applying the nonlinear characteristic of neural network. Integrating neural network and fuzzy mathematics, firstly, this method trained the neural network, which was constructed according to evaluation index system through schemeevaluation samples and could make evaluation model reflect the relation betweenevaluation attribute values and evaluation conclusions as well as the weights of evaluation index better. Then, after completing fuzzy quantification of index values of candidate schemes and inputting these values into the neural network model, evaluation result could be obtained. This method could utilize expert knowledge more effectively and simplify evaluation process. Moreover, some key problems of kinematical scheme evaluation based on neural network were discussed. An illustration had demonstrated that this model was feasible and could be regardedas a new idea for solving kinematical scheme evaluation.

In automatic mechanism selection system based on orbit, orbit characteristics and dimension parameters of key orbit segments are momentous for selecting mechanisms. An orbit curve identification method based on characteristic is presented. By describing orbit curves with abundant forms with the basic orbits such as line, arc, cusp and “8” form, identification of orbit characteristics can be well solved and fundamental characteristic parameters of key orbit segments can be determined.

A redundancy optimization model is established. A new method of system reliability grounded in particle swarm optimization algorithm, which combines with idea of genetic algorithm, is put forward. Through illustrations, the results show that this algorithm can achieve better effect than those of simulating annealing algorithm and genetic algorithm.

By FEA method, dynamic analysis and calculation are conducted on transmitting rapier system. Aiming at different materials of transmitting rapier system module griper heads, bands and wheels, natural frequency and every order frequency modal shapes of transmitting rapier system are solved. The results show that different materials of transmitting rapier systems generate little difference in natural frequency but no difference in modal shape. The results provide references for improvement of designing and developing transmitting rapier system structure and selection of different materials.

Accurate finite element modeling of accurate tuning unit is conductedand relationships between connecting spring, tuning bolt and matching are analyzed through equivalent modeling method. Within the range of 0-65 ℃, mechanical performance of tuning unit has been investigated and evaluated. In addition, frequency compensation principle of tuning unit under high temperature is studied. Testing results indicate that the calculation and analysis are right.

To shorten the period of manufacturing and repairing of automatic tightening machine for screw and meet the high-efficiency requirement of enterprises, an automatic tightening system for screw based on modular design is proposed.On the basis of analysis on control principle of pre-tightening force and tightening process, this system is divided into various functional units and applies modular design from software and hardware. Furthermore, a series of mechanical and electric units are established to make this system be able to be assembled and repaired rapidly. Practical application indicates that this system can enhancethe efficiency of repair and manufacture.

According to the inverse solutions of 3-DOF translational parallel robot mechanisms, an accuracy model for such mechanisms is established through differentiation theory. Through computer simulation, rotation error of rational joint, structural parameter error and influence on robot mechanism accuracy when posture changes, are analyzed. These provide theoretic references for practical error compensation and control for such mechanisms.

To solve weakness of self-rotating driving force, deficiency on capacity of resisting high temperature of plastic twisted strip, as well as abrasion,a scheme, which settles the heat-resistant and abrasion-resistant problems byplastic coat and intensifies the capacity of transferring self-rotating driving force by installing driving wheel at the tube inlets, is proposed. Results indicate that such spiral-insert can achieve auto-cleaning at low speed and can be widely utilized. In addition, its cleaning capacity is great. The enhancement of convective heat transfer is as great as 52.6%, which is 60% higher than that of steel spiral-insert. This equipment has advantages in lower resistance, lower cost and simpler structure.

According to the entire design requirements and restraints of a certain solid propellant rocket motor, design method of nozzle contour is put forward. In this method, muzzle internal flow field, pressure against nozzle wall and temperature variation under different pressures are analyzed by applying Computational Fluid Dynamics (CFD), one-equation model: S-A Turbulent Model and finitevolume method. According the results of computation of flow field, instantaneous propulsion of motor is gained, which is compared to the result of ground test.

Computerized flat knitter is always the main device in the manufacture of knitted sweater, whose core part is its control system. With the popularization of computerized knitting, those computerized flat knitters with high cost-performance and high integration are becoming more and more popular, and accordingly their demand is bigger and bigger. However, most current knitters in the market utilize Single Chip Machine as their main processor or are developed based on Industry Control Machine. The former has low integration while the latter has high cost. Through analysis on structure and function of knitter system, by employing an EPU chip based on ARM kernel, which is cooperated with two high-integration CPLD chips, an improved embedded control system in computerized flat knitter with its hardware and software is designed to solve the above problems. This control system has self-contained knitter control function, nice graphical user interface, vast data memory interface and topping network support, which guarantees that it can fulfill most demands of knitter control and users’ requirements.Control system based on such design scheme is outstanding with its high cost-performance and integration, combined with its high utility.

There exists a shape-surface deviation in reflective surface of deployable antenna because it is formed by covering metal-wire-net film on deployablestructure. In order to meet the requirements of surface and shape accuracy, it is necessary to confirm all the parameters ahead, such as number and length of members, angles between them and their space position. This program and the operating windows are developed respectively by Matlab and VC++. The results show that it has high practical value.

Based on the idea of generating the initial points through one dimension chaos mapping, and then taking them as the initial values by mapping them tothe variable interval, a new method based on chaos mapping Newton Iterative to seek the solutions of nonlinear equations is proposed. Additionally, research oncrank-slide mechanism by applying this method is conducted. The results show that this method, a fire-new one for mechanism design, is simple and practical, and can offer multiple selections for practical mechanism design.

The basic principle of 3-D pick-up in computer graphics is introduced. Research on pick-up through corresponding changes of various computer graphics based on ray is conducted. And then picking up 3-D graphic units is implemented by utilizing OpenGL function library and Microsoft DirectX 9.0. Experiments have proved that coordinate change among various coordinates can be easily implemented by OpenGL and Microsoft DirectX 9.0. Ray pick-up is valid in increasing programming efficiency, operation speed, render efficiency and pick-up accuracy.

To shorten developing time, reduce cost of textile design and build more effective communication between enterprises and customers, a new realizationmethod to simulate real effect of textile in 2D virtual environment is presented. By utilizing accumulative bowstring arc length curve for curve fitting, and adding inner control lines in curving quadrangle, established in 2D virtual environment, simulation effect and accuracy are improved and then finite element meshis generated with bilinear interpolation. Finally by using the texture mapping technology based on triangle mesh, objective area trimming and color synthesis of pixel point technologies, mapping between texture and curving mesh is completed. Designers can simulate the effect of the designed products in this system, programmed in Delphi7, at the beginning of design. System architecture, implementation principle, and core algorithm are introduced and then a detailed and effective method for texture mapping is provided. Through the above method, a good simulation effet of texture mapping is gained, which demonstrates that this method has a wide application prospect.

Empirical research in engineering design indicates procedural characteristics which improve solution quality: opportunistic strategy; combination of thinking by head with thinking by hand (sketching); question-based reflection of own results. They correspond with predictions of the generictheory of mental regulation of working activities(“action theory”).