Due to the current product innovation design platform of many types of users and complicated forms of resource， it is difficult to obtain the required information for different users quickly and accurately. A product innovation design service platform framework based on the user model was proposed， and the development of the corresponding system was achieved. Through the establishment of ontology-based user model for acquiring user's interests， the user model offered three different ways to obtain the user's interests. Based on the user model， a new architecture composed of the user layer， application service layer， personalized operational layer and resource layer was built， and the implementation process for users of the specific service based on user requirements was provided， which can assist users to effectively obtain the necessary information and achieve support for the user in the design process．

Carpentry board guillotine cutting layout optimization algorithm is put forward to solve the low efficiency and low material utilization of carpentry board manual layout. To meet the requirements of guillotine cutting process， heuristic partition principle was added to the surplus rectangle matching algorithm. To improve the utilization ratio of carpentry board and reduce the cost of production， the genetic algorithm was applied in rectangular part optimal layout. To improve the optimization precision of the genetic algorithm， non-linear fitness function which based on index transformation was used， elitist strategy was introduced， and the partially matched crossover operator was applied. The surplus rectangle matching algorithm was combined to decode the genetic population to calculate the utilization rate of materials， which was used as the fitness function value to search the optimal solution by iteration. Layout instance indicates that this algorithm can efficiently solve many varieties of mass carpentry board layout problem．

Simplified chain length measurement method currently used in chain wear test for elongation calculation has relatively large theoretical error which cannot guarantee the effectiveness considering increased types of measurement requirement. The measurement system based on axial distance was  divided into two parts, where the part of chain was straighttight or bended. Then mathematical models were created for the system considering the influence of measurement timing on error. Based on error analysis, the approximation of polylines with arc was proved to be the main cause of the measurement error. A new calculation method with smaller error by an order of magnitude was suggested, which made the simplified measurement method meet the general requirement on accuracy. It was also proved to be correct by validation with test standards. The improvement on calculation alone is meaningful in specific application areas, and the accuracy can be further increased by applying error analysis on equipment design.

In order to design an omnidirectional antenna with simple structure and high reliability， a novel Half Mode Substrate Integrated Waveguide （HMSIW） leak-wave antenna array formed by series arranged dipoles at H wall of HMSIW was presented. The antenna was modeled by using a full-wave electromagnetic simulator. The influence of medium thickness on antenna bandwidth was analyzed and the antenna structure was optimized. Then the antenna was fabricated through a single-layer Printed Circuit Board （PCB） process to verify the design. Wide bandwidth and quasi-omnidirectional radiation pattern were obtained. The proposed antenna kept good radiation performance at 7.3-9.7 GHz frequency range and the gain reached 5.8 dBi. Measured results show the effectiveness of the proposed approach．

In view of the problem in explicitly calculating the driving force of hydraulic cylinders accurately in the boom system of a wet spraying machine, the dynamics model of the boom system was established by using the method of analytic geometry and Lagrange equation. An equivalent driving cylinder was established as a twobar linkage mechanism including a cylinder rod and a sleeve which were in rectilinear motion relatively. Thus the boom became a multilink mechanism that was an incompleteopenedchain. Using the method of analytic geometry, a functional relation between boom bars' rotation angles and hydraulic cylinders' stroke was deduced as the kinematic model of the boom system. On the basis of kinematics and Lagrange's dynamical equations, the mathematical model related generalized forces (driving force of hydraulic cylinders) to generalized coordinates (cylinder stroke) was established. A typical working process of the wet spraying machine was selected to analysis. The analytic expressions of the generalized forces were solved by using the software of MAPLE. Then the expressions were imported into MATLAB to carry out numerical solutions. At the same time, the boom system was analyzed by using the tool of Pro/E mechanism dynamics. It contrastively showed that the simulation results of MATLAB were approximately in conformity with the PRO/E's, which verified the validity of the dynamics model of the boom system. Finally, the influence on maximum driving force of driving cylinder on a typical condition by change of position of the cylinder pivot point was analyzed and the results showed the original structure of boom system should be optimized. Thus, the dynamical model provides a theoretical basis for selecting the type of cylinders and optimization on the actuator force of driving cylinders.

In order to do innovative design for shell type parts on large mechanical equipment, a flexible virtual prototype coupling model of large mining height shearer´s rock arm shell made by casting, forging and welding technology was built to study the thermal equilibrium procedure of the gear system in the shearer´s cutting part. The temperature load and boundary conditions were determined and the dynamic load files which were output by MSC. ADAMS were loaded. Temperaturestructure coupling analysis of shearer´s rock arm shell studied by ANSYS, and then based on the coupling results the fatigue life prediction was researched by ANSYS. The temperature field nephogram and the structure coupling analysis nephogram of the shearer´s rocker arm shell were obtained to find the fatigue life´s weak links of the shearer´s rocker arm shell and put forward the improvement measures to increase the stiffness, strength, fatigue cycles and safety factor. The research results showed that the influence of the temperature field made the maximum stress which was on the rocker arm shell increased by 11.707%. The research results provide a unequivocal quantitative basis for the design and optimization of the mechanical equipment´s large shell type parts which could improve this type of parts´ functional reliability effectively．

In order to reduce the electromagnetic interference to other electronic equipment, the common mode radiation caused by the heat-sink and switch tube jointly was analyzed using the common mode radiation source of the PWM full bridge circuit as the object of study. The calculation mode of aluminum heat-sink with fins was established. The energy coupling and radiation emission mechanism of the heat-sink was analyzed by means of the numerical calculating method. The suppression effects of shield plate size, position and ventilation holes on the radiation were discussed regarding shield as the main radiation suppression method. The improved structure of the shield plate was also put forward. It was shown that the using of two shielding plates placed in correct position could effectively suppress the radiation. And the longer the shield plate, the better the common mode radiation suppression effect. If there were holes on shield plate then its radiation would be higher than the situation without holes, but the number of holes had little effect on radiation. Using the improved structure, the common mode radiation suppression effect was better than the original model, especially in the 3.9 GHz narrow band range.

Combined rotor is the vital part of a gas turbine. It is important to reveal the performance degradation mechanism and assess the performance degradation characteristics of the combined rotor for making maintenance during operation. To reveal the performance degradation mechanism caused by structure degradation, the change rule of pretension force under time-history was obtained with consideration of the rod stress relaxation at high temperature. By defining the degradation degree of combined rotor with the pretension force of rod, degradation level of combined rotor system was evaluated. After calculating the contact stiffness of adjacent disks interface and analyzing the dynamic characteristics of combined rotor considering contact interface, the effect of different degradation level on dynamic characteristics of combined rotor was obtained. The result showed tht temperature was a sensitive parameter for combined rotor degradation, the drift of combined rotor natural frequency was caused by the relaxation of rod, and the relative reduction of the first three order natural frequency for combined rotor differed quite small, which had a linear relationship with degradation degree to some extent．

Alignment angle of wheel makes the condition of tire force changed which causes the side skidding and consequently changes the vehicle performance. The paper quantitatively studied the influence of toe and camber angle on handling performance. On the one hand， the influence of toe and camber on corning characteristic was explained by tire side skidding. On the other hand， mathematical relationship between toe， camber and corning radius was explicitly expatiated by vehicle doubletrack movement model with toe variety. Then toe angle， camber angle on different tire loading condition were analyzed by simulation. Finally， the influence tendency of toe， camber on full vehicle steady and transient handling was specifically and quantitatively studied， and quantitative relationship between toe， camber and steady， transient handling index was obtained. Results are consistent with theoretical derivations and form a foundation for precise design about alignment angle of wheel．

In order to achieve the accurate description of dynamic characteristics of liquid snow-melting agent in pipeline system， and to solve the accuracy control problem in the process of distribution， the model of distribution parameters for the integrated pipeline system of snow-melting agent distributor was established by AMESim platform based on the power bond graph theory according to the operating principle of physical pipeline. The dynamic characteristics analyses showed that the pressure and flow distribution of the pipeline system were lack of uniformity and need to be optimized. The pipeline system showed low pass filtering characteristics， and the pump source signals with frequency above 40 rad/s attenuated soon when that were transmitted to nozzles. The system´s transient and steady-state performance had different sensitivity to different design parameters. The effectiveness of the pipeline system model based on AMESim was proved by comparing the steady-state results of physical experiment and system simulation. The proposed methods and results provide a reliable theory basis for parameters design of the components matching and control in pipeline system of liquid snowmelting agent distributor．

The 3-UPS-S parallel mechanism is used for the tea screening according to the requirement of screening the flakeshaped tea.The kinematic model was built and the workspace， dexterity and singularity were analyzed. A 4-UPS-S parallel mechanism for tea screening was proposed by adding redundant actuation based on the singularity analysis. The solution of dexterity and motion trail were carried out which indicated that the flake-shaped tea screening plant based on the 4-UPS-S redundant parallel mechanism had a better kinematic performance. The tea can be layered， dispersed， and pass the screen successfully which satisfies the real requirement．

A novel dual composite right/lefthanded transmission line （D-CRLH TL） was designed by using structure of spiral inter-digital figures and stub with rectangular patch. Its structure was analyzed by full wave electromagnetic simulator and Bloch-Floquet theory， the dispersion curve was calculated. The simulated results showed that the designed D-CRLH TL had good bandstop performance and the two transmission zeros could be controlled independently by adjusting the physical parameters. Then， based on this novel D-CRLH TL， a miniaturized bandstop filter with good performances was designed， fabricated and measured with good agreement to the simulated results， showing that this designed filter centered at 3.56 GHz， the stopbandwidth was 39.3%， the shape factor was 0.85， the passband out of the stopband in high frequency was 4.47-8.42 GHz， and the whole electromagnetic performances are perfect. Moreover， the size of this designed filter was 0.237λ×0.145λ （λ was the wavelength of center frequency in the free space）， and the miniaturization was realized．

To avoid defects of traditional design and processing method for the spiral bevel gears with approximate spherical involute, a new design of spiral bevel gears is proposed. According to the precise composition and shape characteristics of tooth surface, the spherical involute theory was applied to derivate equation expressions of the basic curves of tooth surface which achieved the tooth surface parameterization. Then, discrete points on all areas of tooth surface were obtained respectively. In order to further improve the accuracy of the tooth surface, a unified precise fitting of NURBS curves and surfaces for tooth surfaces was processed. Examples showed that the relevant method was accuracy and useful which proposed new ideas and approaches for the digital design and manufacture of spiral bevel gears．

Study on the friction coefficient of the tooth surface plays an important role on reducing friction loss and improving the system transmission performance. A non-linear time-varying dynamic model of involute spur gear was established to obtain the dynamic mesh force and final instantaneous tooth force under dynamic conditions. Considering the surface roughness and dynamic load, the friction coefficient along line of action was obtained by employing the load sharing concept and elastohydrodynamic lubrication theory. Comparisons between the results from the steady and dynamic loading conditions were given. The effects of rotational speed, surface roughness and lubricant viscosity on the friction coefficient were also analyzed. The results showed that dynamic load would affect the oil film thickness, the oil film load scaling factor and the friction coefficient to some extent. The oil film seemed thinner at the beginning of meshing region and appeared thicker at the end of meshing region. Rotational speed didn't affect friction coefficient monotonically. As rotational speed increased, friction coefficient decreased evidently. Then with the decreasing of rotational speed, the friction coefficient became larger. The friction coefficient increased evidently when the surface roughness increased and the increase of lubricant viscosity in a certain range would lead to a smaller friction coefficient.

In order to improve the lubricating property of the strip stern bearing, the influence of different strip shape on the mechanical properties of stern bearings was studied and the structure was optimized with applying finite element method. The mechanical properties of the stern bearings were discussed with different curvature radius of concave and convex arc strips and different bearing areas of various wedge-shape space strips. The result showed that the mechanical properties of the plane strips were relatively better, among the three different strip shapes. The influence of different concave and convex arc strips curvature radius on the mechanical properties of strip stern bearings was obviously different. The critical point with relatively optimal mechanical properties, which meant with maximum stress and minimum strain, existed among the various wedge-shape space and single strip bearing areas. The mechanical properties of the optimized plane strip stern bearings are improved obviously．

High performance ferrocement laminate(HPFL) is a new method of structural reinforcement with advantages of its fire-proofing, heat-resisting and can be easily constructed. To study the performance of reinforced concrete beam strengthened by HPFL and suffered from fire, existing test results of high performance ferrocement laminate and reinforced concrete beam suffered from fire were combined, PLANE 55 in ANSYS was used to simulate temperature distribution in cross section of RC beam after fire which section was simplified to an equivalent T cross section based on calculation of two steps model. Considering with stress-strain hysteresis phenomenon between high performance ferrocement laminate and concrete, initial strain of strengthened element was obtained in initial load. Through analyzing the stress state, the method for calculation of bearing capacity of the right section of RC beam under second load was put forward and compared with the test datum by an example of practical engineering. The result shows that theoretical formula coincides well with tests, and high performance ferrocement laminate can improve bearing capacity of RC beam after fire, which offers references for reinforcing concrete structure．