Problems of vibration fatigue in engineering structure were reviewed. Firstly, significance of research on vibration fatigue was expounded based on the phenomena about structural vibration fatigue in engineering, and the definition and features of vibration fatigue were elaborated. Then, research on the development of vibration fatigue life analysis and vibration diagnostic based structure fatigue at home and abroad were reviewed. Achievements on coupling effect of vibration fatigue were introduced at the same time. At last, some opening issues at present and new topics of this field in future were put forward.

In order to develop a biomimetic robot caudal fin with active motion control, we took crucian caudal fin as the research object. Upon the biological investigation results and combined with characteristics of shape memory alloy (SMA) material, we designed a bionic crucian caudal fin driven by SMA and achieved its active motion control. Firstly, we introduced the mechanical structure and control algorithm of caudal fin and its actuator. Then, we turned to the key component, viz. SMA fin ray, performing a theoretical analysis on the relationship between fin ray base deformation curvature and oscillatory amplitude. And after that, an experiment was carried out to investigate the relationship between the output force of SMA fin ray and its thickness, and simultaneously present the relationship between the oscillatory amplitude and the thickness. In addition, the influence of heating current duty cycle on the maximum oscillatory amplitude and the highest oscillatory frequency was studied. From experimental results we conclude that the output force of SMA fin ray increases nonlinearly with the increase of its thickness; the oscillatory amplitude decreases linearly with the increase of its thickness; the oscillatory frequency dramatically increases with the increase of heating current; the heating current duty cycle has some influence on the maximum oscillatory amplitude.

Aimed at problems that working reliability calculation precision was quite poor for missile's folding and deploying mechanism， this paper combined reliability calculation method based on moment state function analysis with the method based on mechanical work state function analysis， adopt moment and work on the missile wing as characteristic variables of reliability， set up a working reliability calculation model of folding and deploying mechanism， proposed Monte Carlo simulation calculation method on mechanism reliability， and carried on working reliability analysis and calculation for folding and deploying mechanism of certain type missile wing. The attained degree of reliability is 24.34% higher than that based only on moment， and 11.74% higher than that based only on work. The calculation result shows that the degree of reliability， which was obtained by the method proposed in this paper， is more closely to the engineering practice compared with calculation results based only on moment analysis or mechanical work analysis．

In order to suppress checkerboard patterns and gray-scale elements in topology optimization of continuum structures, a modified updating technique for sensitivities information was proposed by using the updating technique of particle states in particle swarm optimization(PSO) algorithm for reference. Taking the minimal compliance of structure as optimization objective, the optimization model of structural topology was established based on solid isotropic microstructures with penalization(SIMP). According to the analysis and discussion of optimized results, the optimality criteria algorithm was used to finish the updating of designing variables. Topology optimization design of typical loaded structure in two dimensions was conducted and the optimal material distribution in the design domain was thus obtained. Compared to the existing filtering technology of sensitivity, the validity of the proposed method is substantiated by several typical twodimensional topology optimization problems.

In view of the plow machine energy consumption and the load fluctuation problems, the probabilistic perturbation method and the Edgeworth series technique were employed to devise a practical and effective method for the reliability optimization design for plow head with non-normal distribution parameters on condition that the first four moments of basic random parameters had been known. It calculated plow head multi-objective reliability and then simulated operation reliability by genetic algorithm NSGA-Ⅱ.The optimized result indicated: load fluctuation and specific energy consumption of plow head are obviously lower, enhancing mechanical working reliability and energy utilization efficiency of plow.

In order to improve the steering handiness performance of a certain formula racing car, the relation between rudimental yaw velocity and the caster and kingpin inclination was built according to the calculation equation of kingpin inclination angle based on the nonlinear cornering properties of tire. Based on these, the optimization of kingpin inclination was performed. Then the virtual prototyping model of racing car was built by multi-body dynamics simulation software ADAMS. The multi-body dynamics simulation shows that, under the premise of returnability assurance, the steering handiness is improved, which provides the reference for the racing car design.

 Discrete track recording(DTR) media is prone to be damaged during the transient contact with the slider. In order to improve the transient contact condition of DTR media, a transient slider/DTR media contact model was presented by using finite element method. The distribution characteristics of contact stress field of DTR media were investigated before and after planarization. The effect of contact prerequisites and planarization on the maximum equivalent plastic strain and the total volume of plastic strain was analyzed. The results show that the maximum equivalent plastic strain and the total volume of plastic strain increase with increases of the impact and radial velocity of the slider. It is also found that the maximum equivalent plastic strain increases and the total volume of the plastic strain decreases with an increase of friction coefficient. Planarization can reduce the maximum contact stress of tracks and relieve stress concentration at the beginning of the transient contact process and reduce the maximum equivalent plastic strain and the total volume of plastic strain during the whole process. Filling materials with different elastic modulus in the planarization process, such as magnetic materials and diamond-like-carbon, have little different effect on the improvement of contact conditions of tracks. These conclusions can supply theoretical guidelines for reducing the damage level of DTR media.

In order to research the effects of picks arrangement on loads pattern of rock cutting with longitudinal cutting head, loads of three kinds of cutting heads with different pick-arranged were simulated on basis of the mathematical model of rock cutting loads of cutting head, load fluctuation curves and related statistical data were developed. They indicated that the load fluctuates on two frequencies, in which the low-frequency fluctuation is determined by number of helixes and their wrap angle, the value of low-frequency is equal to number of helixes multiplied by rotating frequency of cutting head. On the other hand, the high-frequency fluctuation results from discontinuity of picks, taking the rotating frequency of cutting head as the fundamental frequency.The value of highfrequency is related to circular interval angle of picks. Under the same conditions, average and maximum of R_a，R_b，R_c，M_c increase with θ_i increase, but mean square deviation and volatility factor of R_a，R_b，R_c，M_c decrease. A theoretical computational formula, which can be used to guide the design of longitudinal cutting head, is developed according to the simulated data.

Kinematic chain isomorphism identification, which is a problem in mechanism innovative design, is studied. Based on graph theory and mechanical topology, the sub-block, the square sum degree and the association degree between sub-blocks were proposed. Based on the connection relations between vertices of topological graph, the vertex sets were built. An algorithm, making each vertex a set, then mapping them, finally realizing isomorphism identification, was proposed. The experiments presented show the proposed algorithm is more effective and efficient than existing algorithms. The basic theory of algorithm design is applied in mechanisms, which provides a new method in this field．

Vector graphics are widely used， but lack of dynamically extensible library with the primitive components of vector graphics editor. It has become an important problem that how to design reusable components to enhance the design efficiency and improve the design quality. After analyzing the needs of graphic editing components， we made the most of the Java platform and the reflection mechanism to build the vector graphics system， which included the vital technologies of composite graphics' creating， displaying， saving， zooming， dragging， roaming， Hawkeye, etc， and specify the principles of the design ideas and architecture. The designed vector graphics editor components can be expanded and edited with the existed and derived primitive graphics components．

To improve the parallel robot trajectory tracking control precision, a 2D plane parallel robot was studied as the research object and a kind of extension controller used for the control system was established. Seeing properties that the adaptive controller is good at dealing with the same and slowly timevarying problem and extension controller is good at dealing with time-varying and mutation problem, the advantages of the two kinds of controllers were combined and a new type of extension adaptive controller was developed. The simulation results show that the extension adaptive controller can greatly improve joints position precision and end implementation tracking precision of the parallel robot and can satisfy the the robot control requirements.The methods and results put forward are general and have broad prospect in application of the parallel robot control.

The air suction fan is an important component device of agricultural modern production equipment. Aiming at the faults occurring currently in the fan, the fan fault symptoms and corresponding fault type were collected. Combined fault sample data and fuzzy neural network, confirmed input and output vector of network according to the BP neural network and diagnosed the fault of fan. The diagnosis is consistent with the reality. Use MATLAB to simulate neural network fault diagnosis and the simulation results show that the diagnosis error is small, output vector and the actual fault matrix results are approximate.

A prototype of the micro-flywheel system with the superconducting magnetic bearing has been designed concerning the problem of huge loss at a high rotating speed of flywheel systems. This micro-flywheel system adopted the superconducting magnetic bearing as the supporting mechanism, and the brushless planar DC motor as driving device. Vacuum system was designed within the restrictions of field-cooling height and motor gap, so that the flywheel could operate stably in the vacuum circumstance. The experimental platform of flywheel was build to analyze the energy consumption of the superconducting magnetic levitation flywheel system and study the influence of the power consumption of the flywheel system by the superconducting magnetic levitating bearing. The influence of friction loss of the superconducting magnetic bearing by the cooling height was studied through testing the spin-down curve of the flywheel. Test result shows that the maximum speed of the flywheel rotor could reach up to 33 000 r/min at the same energy consumption, and the energy consumption of superconducting magnetic bearing is only 1/7 of that of mechanic bearing at the 15 000 r/min rotating speed. The result also indicates that the loss of superconducting magnetic bearing reduces as the cold height increases, and superconducting magnetic technology can satisfy the need of low power consumption at high rotating speed．

With the development of science and technology, pressure vessels using quick actuating device is becoming more and more common. How to make the quick door-opentype pressure vessels automatically lock safely and reliably after being closed and compacted, it is always a difficult technical problem. This article presented a new type of quick door-opentype pressure vessels safety locking device consisting of the hook, rod, stick, frame and lock cylinder,in which the hook, rod, stick and frame formed a four-bar linkage. When the vessel's gate quickly closed and compacted, it was closely locked at the “dead spot” of the rod and stick and the “dead spots” position was locked by the clamping cylinder. The device achieved its locking status by its own energy when pressed. The compression hook and clamping block could not only be pressed closely, but also locked closely.Therefore, not merely is the device stable and reliable, but its structure is simple and its operation is convenient as well．

The inventive principles database of TRIZ(theory of the solution of inventive problems) could provide design cases for designers to structural analog innovation. It is bother to install and disassemble original curved plate very hard when the rope guide of electric wire rope hoist damaged. Against this problem, detailed analysis was obtained by the method of conflict analysis of TRIZ. Corresponding inventive principles were obtained by a software system based on TRIZ. Improvement designs of the guide rope of electric wire rope hoist were obtained according to invention principles. Those not only could improve the performance of electric wire rope hoist, bring social benefits for using of electric wire rope hoist, also could add cases to the database of TRIZ inventive principles, and the inspirations could be provided for other designers who use inventive principles of the software system.

Using evolutionary trees could predict product development and avoid the existing patents. The method for evolutionary trees is based on the division line of the main objects. In this line, it identifies the stage which need to be improved, searches the available evolution lines, and forms the evolutionary trees ultimately. At last, it finds the solution to the problem in the evolutionary trees. In the innovation of softener supply unit in roller washing machine, the evolution line was cut by the system components and the prompt was gotten by the geometric objects evolution line. By using evolutionary tree, a new solution that a single triangle prism substituted original fourslot supply unit was found, which avoided existing patent effectively.