Against the background of increasing demands for quality in technical products, shorter cycles of development as well as parallel development processes,it becomes more and more important to receive statements about critical influences  and risks in the component functions at an early stage in order to make a potential fault clearance as cost neutral as possible. One method besides the already established simulation processes in development exists in tolerance analysis. Thereby the confirmation of the function measurement concept is secured. This also is a benchmark for production, function and assembly features of components．

Aiming at the requirements of automobile human-machine interface in dynamic environment， according to multi-body dynamics， a vertical vibration model with 4-DOF for the upper part system of a seated human body was established. And then the theoretic expressions of STH， DMP， AM of the displacement， velocity， acceleration responses was derived. According to available experimental data of human body vibration， by adopting system identifying method， dynamic parameter identification of this vibration model was carried out and then human vibration property was calculated with the identified parameters. Validating research indicates that the property data of human vibration accords well with the measured data. By taking automobile human-machine interface as an example， the vibrating property of human and seat in human-automobile system was studied through this model. The obtained result can be regarded as guidance for reasonably selecting parameters of seats and improving amenity and rationality of the man-machine interface.

Mass customization oriented product design is a collaborative process relating to a lot of industries and fields.It is impossible for designers to master all related knowledge.Rapid acquisition and application of knowledge are the key problems to accelerating product development and enhancing to ability of design and innovation.According to features of moblie phone design,a knowledge reuse method is introduced for meet customer’s demands.The reused coutents include design knowledge,innovation knowledge,product model and BOM.This method is appiled into a CAD system which integrates a lot of design information.It shows that this method provides a solution for effectively resolving the contradiction between quickly mobile phone products updating and more powerful functions to be added.

An algorithm to construct extended chaotic sequence was proposed and this sequence was applied in encryption of digital image. Two methods based on n degree Bézier curve and n degree rational Bézier curve to construct extended chaotic sequence were put forward, the constructed chaotic sequence had well pseudo-randomization. Through non-linear discretization treatment, corresponding integer pseudo-random sequence could be constructed, which would be utilized to encrypt digital image. Numerical experiments show that the chaotic sequence constructed by this algorithm has good encrypting effect on digital image, and this algorithm is simple and highly secure.

To solve the problem of requiring repeated validation， high difficulty of experiment and long period of development in cathode design of rifle of artillery tube in electrochemical machining(ECM)， in the environment of Visual C++ 6.0, UG was secondary developed; user interface was set up; the model for cannon barrel blank and working teeth on cathode model were established and programmed. The method of UG secondary development was utilized to simulating manufacture. The result of experiment indicates that this method can decrease experiment times and shorten the design period of cathode. The adoption of computer\|aid cathode design in cathode design， to some extent， the cost is lowered and the development period is shortened.

Reliability test intensifying coefficient of automotive proving ground is the base to establish test rule， scientific theory and method can get the precise intensifying coefficient. A mathematical model for calculating reliability test intensifying coefficient of motor vehicle was derived on the basis of Miner linear cumulative damage law and then this model was modified according the factors triggering fatigue. Damage factor statistical quantity and frequency factor statistical quantity were introduced into the mathematical model， which made the physical meaning of the multiple factors more exactly. Combining the data of load on the truck working on the intensifying road of Chang'an University automotive proving ground， the integrative intensifying coefficient was obtained through calculation on various roads. This theory and calculating method have common reference value for other automotive proving ground．

Reciprocation is one of the fundamental types of motions in mechanics.According to interferometric principle of wave optics, a set of optical interferometry experimental apparatus under reciprocation was developed to investigate line contact elastohydrodynamic lubrication (EHL) problem.The experimental research on the formation principle of elastohydrodynamic lubrication film under finite length line contact was carried out. The preliminary experiment indicates that the new test rig can work under reciprocating motion and measure the figure and changing situation of the above films.

In the design of pneumatic muscles actuated joint， trial\|and\|error method is normally adopted to select parameters， which cannot acquire the optimal performance. To solve this problem， graph method to determine the optimum parameters was proposed. By utilizing the constant pressure characteristics of pneumatic muscle， the optimum initial length of the pneumatic muscle can be obtained. In the design of joint diameter， to guarantee achieving maximal joint angle， optimizing analysis on joint diameter was carried out. The proposed method is simple and applicable.

In the development of some type of uniform circular array DOA（direction\|of\|arrival） estimation system, a planar microstrip structure one\|eight power divider was adopted to achiever 8\|way ultradyne receivers. Based on design principle, the technology of adding matching\|line in output port was adopted in this divider, and then the circuit simulation and parameter optimization were carried out by using the commercial software Serenade. Through experimental measurement, the divider has the characteristics such as equal power distribution, good phase consistency, simple and compact structure and so on, which meets well the design requirements of this system．

Due to the heavy load and big inertia moment of optoelectronic theodolite, its stiffness will directly affect its tracking capability. Therefore, its azimuth resonance frequency shows more importance. Aiming at this situation, by adopting the integrated modeling and simulating function of UG NX4.0, the theodolite's vertical shaft was modeled and simulated, through which its first three-order azimuth resonance frequency and mode shape were obtained. The simulating result satisfies the requirements of practical work and accords with the result of experiment. Moreover, the components with good rigidity were found. Based on the consideration of reducing weight, optimization design was conducted on the components with good rigidity. Under the circumstance of not influencing the overall structure stiffness, the structure was optimized and the weight was lowered.

The paper overviews the methods of predicting forming limit in sheet metal forming. By utilizing ductile fracture criteria(DFC)， the method to well predict the forming limit was proposed and furthermore， it considered the change of forming path as well. The Cockroft and Latham criteria were applied in the forming of high strength steel(HSS) DP590. The unidirectional stretching experiment was done on DP590 steel to obtain the corresponding physical parameters. Moreover， the rectangular cup experiment was conducted to get the forming limit parameters and corresponding finite element simulation was done. Cockroft and Latham criteria parameter of this material was obtained through finite element simulation. Finally， by employing these criteria parameters， the fracture was predicted in the cup forming. The results accord well with the experiment. It is demonstrated that DFC can be applied in HSS forming．

According to the cutting theory of shearer, the mathematic models of relationship between the helical vane parameters (structural parameters, kinematical parameters) and the objective parameters (coal capacity of the drum, coal conveying speed in axial direction, stoker force in axial direction, minimum speed of the drum, percentage of lump coal) were established. Based on the above, when the vane was with 2\|start, the drum diameters were 1 800, 1 600, 1 250 mm, the relationship between vane parameters (helical angle, drum rotary speed) and the coal conveying speed and the relationship between parameters namely helical angle, drum rotating speed and speed of stroking up coal in axial direction was studied. Furthermore, the influence of the vane parameters (helical angle, haulage speed, drum rotary speed) on the stoker force in axial direction and the percentage of lump coal, and the relationship of the vane parameters (helical angle, haulage speed) and the minimum speed of the drum were analyzed.The results indicate that the helical angle has a great influence on the objective parameters (coal capacity of the drum, coal conveying speed in axial direction, stoker force in axial direction, minimum speed of the drum), and the best value is obtained around 0.3 rad, which provides theoretic basis for design of the shearer drum．

 For the seal plate with a special hatch used in special plate\|shell heat exchanger, by utilizing the APDL（ANSYS parametric design language）, the entirely parametric 3D finite element model was established. Through 3D finite element simulation and path analysis in crucial area, the stress distribution regulation of seal plate was acquired. The experiment results validated the numerical simulation. Through analysis, the influencing factors were summarized and the engineering associated model was presented. By using serial simulation results and advanced data fitting technologies, the stress formula was obtained. Between the data from fitting expression and the simulating results, the average absolute error is 0.238 MPa, and the average relative error is 1.8%, so it is accurate enough for engineering application. The work will provide the reference to engineering application of the new product．

As a mould heating parts, hot plate is an indispensable part of rubble injecting mould machine. As the power resource, electric heat pipe was distributed in hot plate according to heat power to make the temperature field distributed uniformly. To control the temperature of hot plate in automatic way and keep the temperature difference in the range of +2~-2 ℃, thermocouple was put in the hot plate at appropriate position. But so far, the non\|uniform temperature field of hot plate and low precision of temperature control become the main problems for company producing injecting machine and these problem will directly influence the using performance of injecting machine. By adopting FEA method, this paper presented the analysis on transient temperature field of hot plate, and reasonable distribution of heat pipe is obtained and its feasibility was demonstrated in practical production．

To comprehensively analyze and evaluate the technical risk and quality risk of construction design, by adopting expert investigating method, all kinds of risk factors encountered in construction design concerning safety and public interest were investigated. According to the result of investigation, subject evaluation approach was utilized to evaluate the degree of importance and risk of each risk factor on construction quality safety and using function. By using AHP method, the relative importance weight of every risk factor on construction comprehensive influence was calculated and ordered. Based on the evaluation result of AHP, fuzzy comprehensive evaluation on each risk factor was conducted by fuzzy evaluation method. By combining the three evaluation results, ultimately, the conclusion that the overall construction risk is under medium level is drawn and the degree of importance of each factor is proposed, which provides inspiration and guidance for construction designers.

The automatic computation of non-stress length of the main cable strand of suspension bridge was implemented by programs developed by the second development language APLD of FEA commercials ANSYS. The local coordinates was established according to the central strand's spatial coordinates, and then the array of other strands relative to the central strand in the local coordinates was set up. Finally, the real spatial model between the key points of each strand in the main cable was built, which took into account the correction between line and circle at saddles, and then the real length of strand was got by picking-up all element's length. An example indicates that the crucial impacting factors include dead load, coordinates error of control points and temperature, and other factors' impact is small. The maximum length difference of steel wires in one strand is 6.75 cm. The result shows that this method is accurate and simple, and can be applied to complex structure such as the spatial cable net self-anchored suspension bridge to decrease job．