Aiming at the design of cultural product modeling,design elements related to product modeling were subdivided into five aspects, including function, behavior, culture, emotion and structure method. Cultural and creative product concept prototype system was built to design culture creative products by combining case-based design technology, genetic algorithm and shape grammar knowledge. The system was built to guide designers to design some cultural products. A multi-objective optimization model of design element oriented on product modeling was proposed, and the matching operations on the user demand was made. The design method model of cultural products modeling was presented, which combined with the knowledge of product gene tree crossover operation and shape grammar, and a crossing and recombinant of design elements between modern products and cultural artifacts was made. Through the in-depth study of product modeling design elements, and integrating case-based reasoning, genetic algorithm and the shape grammar knowledge into cultural and creative product concept prototype system, it was proved that the system was able to aid the designers to make some creative designs. An example of the design on small speakers was used to verify the feasibility of this method. An effective design method on cultural product design is provided.

In the process of product development, there is a complex information-dependent relation between coupling design tasks with single input and multiple output. Because of the large amount of executed tasks and transmitted information, the complicated relationship between these tasks is hard to be sorted out by using the single-stage task execution method, which may lead to problems such as the unreasonable allocation of tasks in the process of task execution, excessive iteration rework times between tasks and too long product development cycle. To solve these problems, an information processing strategy for the task iteration was put forward, and a two-stage iteration model and the mathematical model of calculating task execution time were built based on the deep analysis of a single-stage iteration model for the coupling design task with single input and multiple output. The best two-stage task allocation scheme was obtained by working out this mathematical model. The effectiveness of this method was proved through the example of an engine development project. The results showed that the iterative execution time of tasks was shorter than single-stage by using the two-stage iteration model and the shortest iterative execution time of the two-stage iteration model could be obtained by reasonably assigning tasks into two phases. The method selects the appropriate task iterative model according to the different information relations between tasks, which can effectively shorten the product development cycle and provide some theoretical reference for product designers to choose reasonable task execution way in the process of product development.

Aiming at further alleviating global warming and reducing carbon emission in product life cycle from source, low-carbon design has increasingly becoming an important direction of product design. Based on exploring the composition of decision making information and corresponding choice of design strategy in low-carbon design process, a carbon emission integrated product low-carbon design information model was established. Based on the analysis of information connotation within low-carbon design decision making, a double progressive positioning method of carbon footprint source features which was based on product structural tree and detailed design parameters was proposed, in which streamlined life cycle assessment (SLCA) using qualitative/semi-quantitative matrix approach was used to preliminarily screen the key structural units with high emission, then the key design features and parameters were stepwisely positioned by weight assigned relation digraph. With regard to design parameters related conflicts, TRIZ conflict resolution theory was used. Finally, a handled vacuum cleaner was used as an example to prove the feasibility and effectiveness of the method.

In order to improve the accuracy of the damping force's output and performance reliability of the damper, the influence of size and tolerance of the double-tube hydraulic damper and the viscosity of the oil on the damping force is quantitatively analyzed. According to the generation mechanism of the damping force, the damping force model before and after the recovery valve opened in the recovery stroke and the damping force model before and after the compression valve opened in the compression stroke were established. By using the MATLAB simulation, the indicator diagram and speed characteristics diagram were obtained, and the performances were verified by bench test. The sensitivity analysis of the different parameters was done by using the Design Exploration module of ANSYS considering the complexity of model. Based on the randomness of the oil viscosity, the opening degree of the recovery (compression) valve which has more influence on the damping force, the prior distribution of the damping force was calculated by using Monte Carlo method. The results show that the damping force is distributed normally, and the method provides a basis for the design of double-tube hydraulic damper.

Electromechanical coupling involving the interaction of mechanics, electromagnetics and thermotics, which has a direct impact on product’s performance. Data transfer between different physical fields is the key to the electromechanical coupling simulation. An method based on model reconstruction to analyze the electromechanical coupling of microwave antenna was presented and a simulation platform was developed. In the simulation platform, firstly, the mechanical analysis was carried out by ANSYS. Secondly, the APDL language was applied to obtain and export the deformed mesh of the structural analysis, and the deformation geometric entities was reconstructed by the Non-Uniform Rational B-Spline (NURBS) theory and deformed mesh. Finally, the deformation entities were imported into the HFSS (electromagnetic field analysis software) to calculate the performance of the deformation of antenna. The waveguide slot antenna was applied to verify the correctness between the method and measurement results. The study shows that the electromechanical coupling will affect the performance of antenna. This method can be used to analyze the electromechanical coupling of antenna at design stage.

In order to study the effects of the abrasive grain size of core tool on grinding force in rotary ultrasonic grinding titanium alloy, abrasive grain in the shape of irregular polyhedron was modeled by cutting regular hexahedron with random interception plane on a hexahedron. Based on virtual grid method, a simulation model of core drill with multi abrasive grains randomly distributing on the end face of tool was built. A 3D finite element model of rotary ultrasonic grinding of titanium alloy was developed by using Deform-3D. The simulation value of grinding force in rotary ultrasonic grinding of titanium alloy Ti6Al4V with multi abrasive grains was obtained by Lagrangian incremental algorithm, and the effects of the abrasive grain size on grinding force was investigated. A series of experiments were conducted to validate the grinding force in rotary ultrasonic grinding of titanium alloy. The result proved that rotary ultrasonic grinding force decreased as abrasive grain size increased and the experimental result agreed well with the simulation result. The result shows that the multi abrasive grain tool model and the finite element model of rotary ultrasonic grinding have certain accuracy. A new way for multi abrasive grain tool relational investigation in rotary ultrasonic grinding has been provided.

In order to find the changes of each monitoring measurement in the process of plug and pull of electrical connector contacts, concerning the influence of different structure parameters on plug and pull characteristic of electric connectors,the process of plug and pull was simulated by ANSYS. The changes of jack strip deformation, stress distribution, plug and pull force and contact force were surveyed, and the change law of contact force and other parameters was analysed with different structure size of the contact.The analysis showed that the variation of the shrinkage had the noticeable influence on each monitoring measurement followed by the jack strip length and thickness, and slot width had a little effect on the contact. The results showed that the finite element method could simulate the changes of the monitoring measurement in the process of plug and pull of contact preferably. The method can provide basis for the design and reliability test of electrical connector contact.

Due to air turbulence, large areas of coal will fall when the special coal-transportation trains pass the tunnel exits and entrances. Aiming at the problems of low efficiency and high cost of manual cleaning for long distance coal cleaning in the tunnel, a new railway tunnel fallen coal dust collection device which was composed of a main conveying coal feeding pipe and multiple branch pipes of coal suction was designed. It was used to clean the small particles and lightweight railway tunnel fallen coal. Firstly, the gas-solid two-phase flow model based on the Euler-Lagrange approach for the design of the main conveying coal feeding pipe was established in the coal conveying pipelines. Secondly, the effect of the coal particles' incident angle and multiple branch pipe spacing on the main coal conveying pipe flow field, which was based on Fluent finite element simulation software, was studied. What was more, the optimal angle of incidence and the optimal value of the number of branch coal suction pipe, which was installed on the main conveying pipe, were analyzed. Finally, the finite element simulation was verified by field test. Simulation and experimental results showed that it was more conducive to the railway tunnel fallen coal transportation when coal particles' incident angle was less than 45° and the branch pipe spacing was in the vicinity of 750 mm. For that when incident angle was less than 45°, the main conveying coal pipe pressure-drop became weaker and particle flow could obtain large horizontal transport velocity. And when the branch pipe spacing was in the vicinity of 750 mm, the horizontal transport velocity had a smaller fluctuation range and the transportation of coal was larger than that of the other groups. The research results are of great significance to improve the structure of the main conveying coal pipe, increase the efficiency of tunnel coal conveying and optimize the railway tunnel coal dust collection device.

To find out the causes of vibration and noise of the trigeminal universal joint which appeared in the installation and use process, the additional moment distribution with the varies of the input shaft angular and the deflection angle was analyzed. Kinematics diagrams of the trigeminal universal joint when the output shaft installed by single radial bearing or twin radial bearing were established. The system coordinates were established under the two installation ways, and the motion equations were established by the direction cosine matrix tools. It indicated that the trigeminal universal joint installed by the single radial bearing was an approximately isometric speed transmission, and was a constant velocity transmission with twin radial bearing installed. Furthermore, the additional moment component on the input shaft and the output shaft was analyzed under the two installation ways. According to the virtual displacement principle, the additional moment on the tripod universal joint when the output shaft installed by twin radial bearing and single radial bearing were determined. When installed by single radial bearing, the deflection moment exists and the vibration frequency of additional moment was three times of the input shaft as a sine curve. The variation trend of the additional moment was straight up with the increase of deflection angle. When installed by twin radial bearing, the deflection moment was zero and the additional moment increased gradually with the increase of deflection angle but did not fluctuate. The analysis revealed that additional moment existed in the trigeminal universal joint system under both installation ways would produce bending vibration. This study is of great significance to study the causes of vibration and determine the nonlinear dynamics of the system.

Due to the randomness, volatility and relativity of the wind power, it brings great challenges to wind power integration. To improve the ultra short-term prediction accuracy of the wind power, a kind of method for predicting super-short-term wind power based on empirical mode decomposition (EMD) and spectral clustering (SC) and ameliorated gravitational search algorithm (AGSA) that could optimize the learning parameters of support vector machine (SVM) was put forward. Firstly, the raw data of the wind power was denoised by EMD to eliminate the irregular data; then the cluster analysis of the subsequences from EMD was carried out by SC, and SVM's model was optimized by applying AGSA to predict each subsequence respectively; finally the results of the subsequences were added together to get the ultimate predicted value. Taking one wind farm's actual data as an example, the simulation indicates that the proposed model can improve the accuracy and veracity when predicting wind power. Meanwhile, it also suggests the reasonability of this method. The method can forecast wind power accurately.

For the flight attitude control of unmanned quadrotor, there still exist some issues on accurate measurement, calculation and output. To acquire a stable flight attitude control, an X-type unmanned quadrotor was designed based on STM32 microprocessor. Dual processors, dual gyroscopes and dual accelerometers were integrated into the hardware architecture. Real time flight attitude information was collected. Quaternion complementary filter algorithm and cascade PID control algorithm were adopted in attitude calculation and output. The experiment results showed that the structure of dual gyroscopes and dual accelerometers had higher measurement accuracy under little angle disturbance, and the attitude angle got a smaller output error with appropriate parameter settings of cascade PID. The results demonstrate that dual sensors can perform stronger noise immunity in attitude measurement, and the designed X-type unmanned quadrotor has good flying performance and can achieve the purpose of flight attitude stability control, which provides guidance for further study on flight control system.

When the bottom plate and the Ⅱ-beam are assembled in the crane major beam production line, the manual rectification process will produce scars on the girder web that need additional polishing operation. In order to improve the condition and cooperate with the robot to deal with the tack weld, the method of magnetic adsorption was used to realize the automatic rectification for the girder web deformation. Firstly, the deformation of the girder web was measured, and the deformation curves were fitted. All deformations were concave, and the max value was 24 mm. Secondly, the effect of the layout of the magnet was analyzed by the finite element method. Under the same magnetic adsorption stress and the same magnet layout, the larger the span between the big rib plates were, the better the rectification effect became. And under the same span between the big rib plates, the small initial deformation was beneficial to rectify. To all grid space, the nearer the distance from the lower edge of the girder web was, the better the rectification effect became. The horizontal layout was beneficial to rectify as compared with the vertical layout to the same magnet (the ratio of the length and the width was greater than 1). Finally, the physical prototype of automatic rectification effector was developed, which consisted adsorption unit, push-pull unit, structure unit, sensing unit and control unit, and the field testing was carried out. And the results of the testing were satisfied with the accuracy requirement(±2 mm) of the rectification process. Moreover, the results of the testing also verified the conclusion of the finite element analysis. As a conclusion, the development of the automatic rectification effector realizes the identification of the deformation of the girder web and the temporary establishment with the girder web, the force perception in the rectification process and the control to the rectification motion. The device realizes the automatic rectification of the web deformation before the robot positioning welding, which is of great significance to optimization of welding technology of the previous process.

A turnover platform for welding robot was designed for the application of welding robot with lower accuracy requirement, which was of low cost and higher position accuracy. In this turnover platform, the pneumatic motor was used as the power output, and the indexing mechanism with high accuracy was the transmission system with high transmitting ratio based on worm and wheel. The position information was acquired by using the photoelectric encoder, and the turnover motion with high accuracy was realized through the closed-loop controller. Simulation results showed that the maximum speed of the welding platform approached 14 r/min, and the platform could meet the requirements of most welding products. Such a turnover platform can offer the application program of the welding robot with low cost for the middle and low level products, and reduce the cost of welding robot and improve welding productivity.

In order to eliminate the redundant moment of force of the electric load simulation system (ELSS) and improve the output accuracy of the system loading torque, a kind of adaptive control method for eliminating position disturbance torque of steering engine was designed. Based on the feed forward control and adaptive control theory, the effectiveness of the method was analyzed by MATLAB simulation software and the experimental verification was carried out. Simulations and experimental results showed that the method could adaptively adjust the system loading error, and the higher the frequency of the steering engine was, the longer the tracking error could be adjusted. In the same conditions of the loading torque and amplitude phase of the steering engine, the higher the steering engine frequency was, the more obvious the inhibitory effect of the control method to the redundant moment of force was. In the same conditions of the loading torque and movement frequency of the steering engine, the greater the amplitude phase of steering engine was, the more obvious the inhibitory effect was. The method can stabilize the system in an ideal output state by the output of the reference model when the actual system parameters are unknown or gradually changing. The research results have certain reference values for the design of aircraft electric load simulator.

In order to solve the problems of poor positioning accuracy and high power consumption of electronic tags in the traditional RFID positioning technology,a design scheme of 2.4 GHz high accuracy regional positioning system based on low frequency trigger was proposed.The scheme combined the low frequency 125 kHz trigger signal with the 2.4 GHz radio-frequency signal,the power consumption of the electronic tag was greatly reduced by the method of low frequency wake,the positioning accuracy of RFID system could be further improved by using the trigger mechanism which could adjust the trigger distance,2.4 GHz active electronic tag,125 kHz trigger and 2.4 GHz reader were designed based on the proposed scheme.The separation design of reader and trigger reduced the cost of layout.In the design of system hardware circuit,the adjustable potentiometer and digital voltage regulator were added to adjust the recognition distance and the trigger distance,these made the configuration of the equipment more convenient and enhanced the practicability of system.The testing data showed that the maximum communication distance between the reader and the tag was 120 m,standby time of active electronic tag can be about 2 years,the positioning accuracy was 1-5.2 m.The result verifies the effectiveness of the proposed scheme.

A standard design approach which is used for the multi-rise H-type cam optimization design is proposed. Aiming at the severe shocking problems of traditional relieving cams during the transient process,the relieving cam design scheme based on motion law of H-type cam followers was proposed. Taking the cam area as the object function and the follower offset and initial displacement as the design variables, H-type relieving cam optimization design model which considered the constrains included the range of theoretical cam surface curvature and the distribution of pressure was proposed based on general design criterions. The optimization problem was featured by multi-constraints, high nonlinear and intensive computation. PMOPSO (polynomial mutation operator particle swarm optimization) method combined polynomial mutation operator and standard PSO method was proposed. By means of PMOPSO method and constraint-handlings of penalty function, the 3-rise and 4-rise H-type relieving cam optimization problems were solved separately. The results showed that the approach was able to decrease the working profile area of multi-rise H-type cam significantly. Meanwhile, the shovel mechanism was more compact.