Subassembly identification is an effective method for solving the problem of "combinatorial explosion" in disassembly sequence planning.In order to identify and generate subassembly accurately and effectively,an algorithm of identifying and generating subassemblies in disassembly sequence planning (DSP) was proposed based on graph models and judgment matrices (GMJM) after analyzing contacts,connections and interferences between the parts in the assembly and corresponding models and matrices.Elements in subassembly collection could be added utilizing graph models and could be decreased utilizing judgment matrices,that was to say,firstly potential subassembly collection was generated retrieving the graph models in terms of criteria of subassembly recognition,then the assemblies that didn't conform to principles of continuity,stability and feasibility in terms of matrix determination formula,and the final subassembly collection consisting of ideal number that met the standards of weight,homogeneity and value would be obtained.The case of gear reducer showed the feasibility and effectiveness of the method.

The concept of adaptable-function machine was introduced,together with the significance of redesigning mechanical product for adaptable functions and that of investigating its relevant change propagation characteristics.The incidence of functions among different adaptable functions was analyzed by means of function abstraction from the point of view of conceptual design,by which the structural and behavioral incidences could be investigated based on FBS.Based on these,a change-based design process flowchart was proposed.The propagation was analyzed by structural constraints and functional constraints,and three rules of the structural constraints were proposed,including the constitution relationship,the bidirectional relationship and the functional constraint relationship.The structural incidence matrix was investigated to describe the possibility of change propagation among different structures.Several typical behavioral characteristics were summarized about change propagation,together with the model of change propagation tree which provided the theoretical principle to choose the best change propagation route.Finally,a case study of redesigning the CA6140 machine tool towards being numerically controlled was provided,and the behavior process of change propagation was used to describe the propagation behavior of specific parts in order to validate the feasibility of the proposed analysis approach.

The product innovation is directly related to the competitiveness of products in the market. Current product innovation of industrial design lacks specific theoretical support,so the aim is to integrate the theory of other fields into the industrial design which can effectively improve the efficiency of the new product design. In order to improve the innovation efficiency in industrial design, a method which combined industrial design theory with Matrix 2003 was introduced. It also summarized the six major design elements, and used these elements to divide the innovation principles based on three dimensions which was the time-space-interaction. All above content formed a unique innovation matrix, which would solve the problems by the effect of the final ideal product. Thus it provides a quick and effective method for the product innovation of industrial design. Lastly the improvement of a express car carriage was taken as an example to further demonstrate the validity and practicability of the method.

Aiming at problems that the calculation method of the field size parameter of the stress field intensity was controversial and difficult to obtain, the theoretical basis of calculation approach of field size parameter was researched based on the assumption of the stress field intensity approach. Considering the calculation approach's feasibility, a approach for determining the field size of component under arbitrary loading conditions was proposed. By given the calculating steps of the field size, the field size for 6 selected notched specimens with different stress concentration factors in 4 kinds of stress ratio was calculated. The figures were fitted by field size calculation results. By analyzing factors which affected the field size according to the figure, conclusions were as follows: field size had a strong linear relationship with the stress concentration factor under the same stress ratio, field size had a strong quadratic curve relationship with the stress ratio under the same stress concentration factor. The calculation approach of the field size parameter was verified through an example. The results showed that the fatigue life determined by the approach proposed was more close to the experiment life, and it improved the accuracy of life prediction on the basis of security.

Increasing designers and companies are paying attention to users' perceptual demand. Aiming at the existing complexity and the subjectivity in the process of digital man-machine interface scheme decision under the requirements of specific multi-image effectively,fuzzy technique for order preference by similarity to an ideal solution (F-TOPSIS) was proposed which integrated triangular fuzzy number and technique for order preference by similarity. Combined with a new type remote control wrecker's digital human-machine interface (DHMI) design, and along with four kinds of perceptual image confirmed by using the factor analysis from the typical HDMI samples, it was applied to achieve the plan prioritization under the decision maker's specific requirements of multi-image for 10 digital man-machine interface conceptual design scheme, and its feasibility and validity were proved. Studies indicated that F-TOPSIS had good performance in the differentiation for the DHMI design scheme, and helped to make decision with specific multi-image requirements reasonably and accurately.

Aiming at the problem that traditional calculation of the multiple-holes' dimension needed to draw the dimensional chain and to judge whether the dimensional chain ring increased or decreased, and the process was complicated and easy to make mistakes, process dimension path graph was proposed to describe the sequences and reference of the process of each hole in planar multiple-holes. A full correlative dimension model was established based on the process dimension path graph, which could obtain all coordinate dimensions with vector feature. Dimension model was solved and tolerances of all coordinate dimension were obtained by using total differential equation. The drawback of available method is avoided using this proposed approach, and this approach is applied to program calculation of multiple-holes processing on machine center and numerically-controlled (NC) machine tool.

In order to improve the efficiency of cutter rock-breaking, the impact of cutter spacing and loading on the rock-breaking effect of TBM were explored. With the mechanism of rock-breaking disc cutter and the theory of rock crushing, a series of simulation models were established in ABAQUS to research the granite crushing effect under different conditions on double disc cutter. After simulation analysis, the conclusion were as follows:Under some certain geological conditions, the optimal cutter spacing was 80 mm both for continuous and simultaneous load, but the rock breaking effect of continuous load was better than that of simultaneous load. By analyzing the experimental data, it could be obtained that the minimum specific energy of rock breaking was appeared between 80 mm and 90 mm. Thus, the correctness and rationality of the simulation were verified. The research is good to understand the rock-breaking mechanism of double disc cutter and to accelerate the development of domestic TBM design theory and engineering application.

Centrifuge is a calibrating device of accelerometer in inertial navigation system,and deformation of the rotator could seriously affect the calibrating accuracy.The centrifuge indoor air flow,heat transfer and heat conduction of cabinet and rotator were considered when the thermal deformation was analyzed through a multi-field coupling simulation,which combined the methods of CFD and FEM.The multi-physics coupling calculation principles were analyzed.Temperature field was calculated by using conjugate heat transfer method,and thermal deformation was obtained by the sequential coupling method.The results showed that at speed of 300 r/min,the maximum temperature rise was 1.23 ℃,and the farther away from the rotator center,the bigger temperature rise.The calculated temperature at the location for mounting accelerometer was consistent with the measured value.The radial deformation of the accelerometer location was 7.89 μm.Thermal deformation is a result of accumulated deformation,and increases with the rotating speed.

Along with the development of the economy, a sharp rise in the family car ownership, parking problem is becoming more and more prominent. A unilateral drive stereo frame intelligent parking was proposed, the structure and working principle of intelligent stereo parking space was introduced. The dynamics model of multi-degree freedom vibration system of intelligent stereo parking space framework was establish to obtain free vibration frequency equation by using Lagrange method. Through finite element analysis software ANSYS workbench, the inherent frequency and vibration model of stereo parking space with or without load and the weak position of stereo parking space framework were analyzed. For no-load and load conditions of intelligence stereo parking space frame, hammer modal test had been done, the correctness of modal analysis of the modeling and simulation results had been verified. Studies had shown that setting up dynamic model and simulation model of stereo parking space framework with multi-degree of freedom vibration system was effective. Research results provide the basis for parking space frame system of further optimization design.

To reduce the production cost and use cost of hot stamping die, topology optimization of die structure was carried out based on numerical simulation about hot stamping. A finite element model based on thermal-mechanical coupled method was created through the software ABAQUS, numerical simulation on high-strength sheet metal for U shaped part's hot forming and cooling process was conducted. The contact stresses between blank and die at critical case were extracted to be the load for topology optimization, and an optimization model which aimed to minimize structure volume with nodal displacement constraints on the die structure crucial areas was created. Topology optimization of hot stamping die structure was carried out, and the weight of die structure was reduced by 20%, and die's stress and deformation almost kept the same with initial design conditions. The research provides reference for the study of numerical simulation for hot stamping process and topology optimization of hot stamping die structure.

For the purpose of reducing the difference between the peak and the valley for load of regional power grid,strengthening the ability of power grid accepting renewable energy and improving the response positivity of electric vehicles (EVs) users,taking the minimized equivalent load fluctuation of regional power grid and the minimized charging price of EVs users as objective function and considering the vehicle-to-grid (V2G)mode,a multi-objective coordinated scheduling model,in which the EVs,wind power and photovoltaic generation system were taken into account simultaneously,was established,so that charging and discharging behavior of EVs could be arranged reasonably.Defining each objective membership function,multi-objective optimization problem was reformulated into a nonlinear single-objective programming problem by means of fuzzy satisfaction-maximizing method,and this nonlinear single-objective programming problem was solved by using adaptive particle swarm optimization algorithm.Simulation results show the effectiveness of multi-objective model and the feasibility of solving method.

A new reconfigurable industrial robot was developed with modular method. The robot's load weight ratio reached 1/4.5 by the optimized design of its structure. Each joint of the robot had the same structure, which reduced repetitive design work. And the transmission components of the joint were all standard parts, which reduced the cost. Through the combination of joint modules and arm modules, different robot configurations could be obtained. Aiming at one robot configuration, the forward kinematics model was established with DH method. Since the robot did not have adjacent three-axis that intersected at one point, it was difficult to obtain all inverse kinematic solutions by traditional method. Thus, a new method with the combination of algebraic and geometric methods was proposed to obtain all analytical solutions. Finally, the kinematic analysis of this robot was verified by examples. The kinematic analysis could provide a basis for subsequent robot motion control.

A double mass vibrating system of self-synchronization with tri-exciter was put forward. The advantages of this system included that it had larger screening area, smaller share space and little loads transmitted to the foundation. Firstly, the dynamic differential equation of the system was established based on the Lagrange equation, and the stable solutions were obtained. Then using Hamilton principle, the self-synchronization qualification and stability condition were obtained. Using the method of controlling variables, the effects of stiffness of middle spring and the installation position of motors to the system self-synchronization and its phase difference were analyzed. The research results showed that the system could realize a stably synchronized motion when the parameters satisfied the synchronization and stability condition. The synchronous phase difference of two motors of upper body was 0° , and the phase difference which was between upper and lower body was 180°. Finally, the results of electromechanical-coupling simulation model verified the correctness of theoretical analysis. The study provides theoretical basis for design and analysis of this system.

For the purpose of water-saving irrigation, a set of the sprinkler irrigation control system was designed based on power line carrier communication. The system could get the field signal and control the actuator with master-slave multicomputer communication mode based on power line carrier communication means, and the host on the control centre room was as the core. Finally, the system test had been carried out. Results showed that the error rate was low, and the data transmission equipment operation was reliable and stable. The control distance reached about 300 m long. The system not only achieves the control purpose, saves the water resources, but also saves a large amount of communication cable, and has very good application value.

LNG(liquefied natural gas) gasification station resently usually separates the tank pressure adjustment from the peak-shaving technique, so the system is relatively complex and need a large investment. Through demonstration research, a system scheme which was combined by the tank pressure adjustment and peak-shaving technique was proposed. Aiming at the characteristics of large lag, time-varying and nonlinear in the storage tank pressure system, the control strategy by taking the generalized predictive control algorithm as the core and the fuzzy control as dynamic feedback compensation was adopted. Accurate pressure control of the storage tank was realized combining with the characteristics of DSP and FPGA device for high-speed data processing. In system practical operation, the control was proved with the advantages of quick adjustment, real-time and strong robustness. And the results showed that the outlet pressure fluctuation of the gasification station was less than 3.5%, and it had a good peak-shaving effect. This system has the characteristics of simple structure, strong anti-interference ability and good peak-shaving effect. And it provides a new idea for city gas peak-shaving system.