As a knowledge carrier involving the most abundant information， patents are the main resources to support innovative design. Based on the analysis and arrange of patent information in the mechanical and electrical fields， with the aid of TRIZ inventive principles and FBSs solving processes， the technical parameters， functional and inventive principle of the patent knowledge can be extracted as the innovative attributes of patent. Patent knowledge can be linked and organized through calculating the relational grade of the patent. Designers can use semantic retrieval methods to obtain patent information from the system and be helped to produce various innovative design schemes. Finally， an instance of the folding bike was demonstrated．

The status and shortages of construction machinery BOM construction were analyzed. A BOM construction scheme based on classification and modularization suitable for construction machinery was put forward. According to construction machinery sales， concepts of main parameter， characteristic parameter and optional parameter were stated. All components of a certain type construction machinery product were partitioned public part， characteristic part or optional part， and then corresponding virtual parts were established. Optional modules with constraint mechanism based on modularization in public part and characteristic part were constructed. When material classification principle was applied to modularization super BOM construction， product code and BOM construction could be completed automatically by programmed Excel table in VBA. The scheme was analyzed and applied to construction machinery BOM construction. It can be concluded that the new BOM construction scheme based on classification and modularization is simple and reasonable， and can automatically construct singleproduct BOM quickly， which is very helpful for construction machinery informatization．

A series repairable system is one of the classical reliability models and is usually used in practice. To meet the need of practical engineering application， a repairable system consisting of two components and a single repairman was studied. We assumed that the working time distribution， the repair time distribution and the replacing repair time distribution of the system were all exponential. After repairing， the system was not “as good as new”. A repair replacement policy N under which the system was replaced when the number of failures of the system reaches N was studied. Under these assumptions， by using the geometrical process and Markov process technique， we derived explicit expression for system availability and failure times in （0，t］ by semiMarkov process and numerical integration. Finally， a numerical example for policy N is given and verified by Monte Carlo. This research provides evidence for further studies of complex mechanical system reliability．

As to the problem of surface pitting of a gear pair with initial crack subjected to rolling and sliding contact， the crack growth model was combined with the reliability and reliability based sensitivity analysis method to calculate the effect of the random parameters on the crack growth. The equivalent FEM contact model based on the Hertz contact theory was first presented for evaluating the crack growth of the gear pair with fine surface finishing and good lubrication， where the cracks leading to pitting were initiated in the area of largest contact stress at certain depth under the contacting surface. And then the relationship between the crack length and the stress intensity factor was approximated by the least squares method， which was applied to the BCS model of short crack growth to evaluate the left life of the micro cracked gear teeth. [JP2]Taking the uncertainty of the gear structure parameters and load into consideration， the dimension reductionpoint estimate method was used for the reliability and reliability based sensitivity analysis. Sensitivities of parameters mean value and standard variance with respect to life reliability were obtained by derivation method. It provides significant theoretical base for resistance of pitting failure.

The failure of snap-action thermostats could result in failures of temperature control and overheating protection function for the electrical kettle， electrical cooker and other household electrical appliances. By applying FMECA analysis （failure mode effects and criticality analysis）， the key components resulting snap-action thermostats failure were determined. Then through key components failure analysis， failure mechanism of the snap-action thermostats were identified， and some measures were provided to improve the products working reliability. FMECA analysis results indicate that the main failure modes of the snap-action thermostats are contact bonding， leaf-spring fracture and temperature drift failure， and key components resulting in failure of the snap-action thermostat are  electrical contact, leaf-spring and thermostatic bimetal-strip. The results of the key components failure analysis show that contact bonding phenomenon is caused by arc. The reason of leafspring fracture phenomenon is that fatigue stress exceeds fatigue intensity of leaf-spring. Temperature drift phenomenon of the snap-action thermostats is caused by size change or layers separation of the thermostatic bimetalstrip．

Injection manipulator is a production equipment to automatically control the plastic processing. In practical work process， injection manipulator generates structure resonance in condition of fast response. It affects the positioning accuracy of manipulator. Parametric modeling method and CAE software were used to conduct the structure resonance finite element analysis of injection manipulator. Based on the multidisciplinary optimization design platform， with the aim of reducing resonance， the adaptive simulated annealing method was adopted to the optimization design in respect of the structure and the size of injection manipulator. Results show that， manipulator platform vibration is reduced， the positioning accuracy of manipulator is improved， and the automation of the optimization design process is realized， thus a systematic reference for the design of similar production is provided．

In order to focus on the impact of fundamental vibration on the performance of the TBM hydraulic components and provide theoretical basis for the optimal design of TBM hydraulic components, mathematical model was established based on the operating principle of direct operated pressure reducing valve. The influences of different fundamental vibration amplitudes and frequencies on valve fluctuation characteristics were researched， and the structural parameters influencing its pressure fluctuations were analyzed. The results indicate that fundamental vibration causes the valve outlet pressure fluctuations， the fluctuation amplitudes increase with the excitation amplitudes. Pressure amplitude increases with frequency significantly when the excitation frequency is greater than 50 Hz. Reducing the backpressure chamber volume and diameter of the return channel can improve the valve dynamic stability.

To improve the working performance of the manipulator of the wet spraying machine CHP30， the manipulator kinematic dynamic characteristics were obtained by using the DH coordinate method. According to the kinetic theory of rigidflexible coupling system， the rigidflexible coupling model of the manipulator was established; then through the rigid model of the manipulator and rigidflexible coupling model dynamics analysis in ADAMS， we obtained the location curve of the end portion of manipulator in each direction of the axis under different load cases. The simulation conclusion shows that the manipulator and concrete gravity dynamic load， and the injection force are the main reason of vibration， the maximum amplitude of vibration is 0.04 m and consistent with the actual situation. The degree of influence of the manipulator coming from the end portion of the ejection force changes with the injection orientation， when the ejection is side surface， the amplitude is largest， but the top side， the amplitude is minimum; and when the rubber feed pipe hangs in the two locks， it has small impact on the vibration. The simulation results are helpful to the design of the manipulator， also provide the theory basis for the trajectory planning and the fatigue analysis of the manipulator.

The servo systems has been widely used in engineering, but the relationships between the characteristics of dynamic load and the following performance of the servo motor are not entirely clear. For realizing the relationships, we proposed a method to analyze how the characteristics of dynamic load impact on the following performances of the servo motor. According to the servo drive theory, we built the mathematical model of servo drive. Then we analyzed the forming principle of the following error of servo motor, and established a function of the following error of servo motor and the dynamic load. Through the experiments on different dynamic load, we prove that the relationships between the characteristics of dynamic load and the following performances of the servo motor conform to that by theoretical analysis. Based on the established function, we optimize relevant variables of the function. The results gotten by some contrast tests show that the following performances of servo motor have been improved.

Non-contact overlapped joint is a frequently used connection structure in enclosure of electronic equipment. Slots are inevitably present in this structure， which result in leakage of electromagnetic energy and deteriorates of shielding effectiveness， so it is necessary to explore methods to enhance the shielding effectiveness of non-contact overlapped joints. The shielding performances of several metallic enclosures with typical non-contact overlaps motivated by plane wave were investigated. Moreover， parameters of overlapped slots such as overlapped length， width， height， and number of segments divided by screws were investigated by the transmissionline matrix （TLM） method and waveguide theory. Based on quantitative calculation and qualitative analysis， the results indicate that the shielding effectiveness can be improved to a certain extent by reducing the width of slots， increasing the length of overlaps and the number of screws. At the same time， non-contact overlapped joint structures which can provide high shielding effectiveness are proposed based on analysis and comparison. Then combined with the rectangular waveguide transmission theory, we come to the conclusion that adopting bending overlapped structure is another contributing factor to improve the shielding effectiveness. The conclusions have been demonstrated to be helpful guidance for shielding enclosure design．

Beam structure is widely employed in engineering applications. Its supporting conditions can not be easily dealt with as ideal fixed or simply supported ones in practice. The dynamics of a short beam under hybridboundary conditions was served as the study object. Modal analyses of short beam structure under different boundary conditions were performed by utilizing the finite element analysis software of Abaqus. Results show that the boundary condition can change the system stiffness， and alter the structure modal characteristics. The modals of short beam vary from the boundary conditions. The analyzed modal frequencies of short beam under mixed boundary conditions consist well with the modal experiment results．

The reason of longitudinal cracks on the lock's surface cannot be explained by conventional design methods. We brought the soil consolidation theory into the analysis of floor's stress， established a FEM simulation model according to the construction procedure of a lock， and further discussed the reason by comparing the results with that gained by the conventional design method. [JP2]Finally we draw a conclusion that the conventional design method is a transient entire method that neither considers the locks construction procedure nor considers time characteristics of the soil settling and leads to a big deviation of the floor's surface stress， and put forward a proposal that designer should apply the simulation method to compute and analyze the floor stress．

The different expressions between Pro/E model and MATLAB/Simulink model affect directly cosimulation. The process of transferring the Pro/E assembly model to MATLAB/Simulink model was divided into two sections: extraction of the assembly model information and transformation of the interface information. The realization of the former was based on feature design technology and hierarchical classification， the latter took .xml as a neutral file and mapped information from Pro/E to MATLAB/Simulink. Transforming constraints of the Pro/E assembly model into kinematic pair of the mechanism was the key point. The process used compositional reasoning algorithm based on the degree of constraint to realize the transformation， and studied spiral theory about transforming constraints into kinematic pair. Finally，the experiment based on the excavator confirmed the feasibility of the research technique. The proposed method has solved the related technological problems when the united simulation is carried out by Pro/E and MATLAB/Simulink．

In order to solve the problems that the exiting upper-limbed rehabilitation robot has sole function and complicated structure， a 6-DOF exoskeleton upperlimbed rehabilitation robot is put forward according to the structure of upper limb of the human body. The kinematics model of the rehabilitation robot was established， and kinematics positive and inverse solutions were solved by D-H transformation. Three dimensional model of the rehabilitation robot was created by Pro/E and was imported into ADAMS/view for the kinematics simulation by Mechanism/Pro. The obtained simulation position curves are consistent with the theoretical position curves，verifying the correctness of the theoretical derivation. Further results of the simulation proves the smooth movement characteristics of the scheme．

The compliances statics mechanics analysis method is generally used to analyse the performance of the compliant symmetric microdisplacement magnifying mechanism with the flexure hinge， but the analysis process and the compliances calculation are very complicated， so the author presents a new analytical method， in which each flexure hinge is transformed into rigid hinge and added a torsion spring on it whose equivalent stiffness is k， the virtual work principle is used to analyse the transformed mechanism， deduce the simple formulas about the input displacement， output displacement and the magnification ration. This method was used in the performance analysis of the compliant 8bars symmetric microdisplacement magnifying mechanism， the results were contrasted with the results obstained by the compliance statics mechanics analytical method and the finite element， which indicated the consistency among them. The new method makes full use of the symmetry of the mechanism， it greatly simplifies the computation and improves the efficiency．

In order to prevent the collision between lifting goods and barrier in the process of running, the principle of ZigBee wireless location was introduced, and the loss model of radio was analyzed. The positioning reference node was optimized layout according to structure characteristics of tower crane, and the localization algorithm was simplified. RSSI values were filtered by using Gaussian theory, and the distance was calculated by the logarithmicnormal distribution theory model. Finally, the blind node coordinates were obtained according to the threedimensional positioning method. The experiment was made in real environment, the results shows that this method can realize the positioning accuracy in 2.5 m. It provides the reference for design of location collision avoidance system and realtime monitoring system of tower crane.