In order to qualitatively and quantitatively describe the state information of each link in Product Lifecycle Management (PLM) design phase,each link’s uncertainty of status information in design phase was analyzed by information entropy,the size of obstacles encountered in each link for reaching a certain state,which was analyzed by information distance.Then the three dimensional model of product was established by TBS method and analyzed its state information,the results indicates that when the customer demand for product increases,the information of product in the design and transition status increases accordingly,this method provides the basis of informatics for the development of product in PLM design phase.

Double-sided lapping is an important process in manufacturing the sapphire substrate.The main purpose is to remove the cutting marks on the wafer surface and make surface roughness homogeneous,at the same time,improve the wafer surface shape accuracy,make its meet certain specifications.The changing process of sapphire substrate surface shape (Warp, Bow and TTV) and surface roughness in double-sided lapping was studied by carrying out lapping experiments.In the initial stage of double-sided lapping,Warp decreases rapidly,Bow decreases slow,while TTV and the surface roughness Ra increase rapidly,but then,Warp,TTV and the surface roughness Ra have a little decrease with an increase of material removal.Bow decreases gradually to a stable value as the material removal increases.The research results have an important significance to optimize processing,improve machining precision and machining efficiency for double-sided lapping sapphire wafer.

Laminated WC/TiC ceramic cutting tool material was fabricated by hot-pressing technique at 1 750℃.The tribological behavior of the WC/TiC ceramic cutting tool material sliding against 316L austenitic stainless steel ball under dry sliding condition and the morphologies of worn surfaces were investigated.The results showed that the applied loads and sliding speeds had a great influence on the friction coefficient and wear volume loss of the laminated WC/TiC ceramic cutting tool material.The friction coefficient and wear volume loss of the ceramic cutting tool material increased with an increase of the applied load.With an increase of the sliding speed,the friction coefficient of the ceramic cutting tool material firstly decreased and then increased,but the wear volume loss of the ceramic cutting tool material firstly increased and then decreased.During the process of the ceramic cutting tool material sliding against 316L austenitic stainless steel,the phenomenon of ploughing,spalling of particle and delamination occurred on the surface of the material.The fine grooves,pits,cracks and flakiness of debris were found on the worn surfaces,which indicated that the wear mechanism of the tested specimens was abrasive wear and adhesive wear.

The finite element model of the frame system is built based on the three dimensional numerical model and the platform of Hyperwork.The static analysis of the frame is carried out to get its stiffness and strength.In order to simulate the actual operation situation of the truck and determine the reliability of the frame structure,the finite element model of the frame is not only aimed at the freedom modal analysis,but also is aimed at the constraint modal analysis.Then,harmonic analysis and transient analysis of the frame need to be undertaken in order to study the dynamic stability of the frame system.Finally,this study provides reference for frame’s optimization of frame structure.

To improve the efficiency of dual-gantry placement machine,the placement process optimization problem is studied,a cellular bat algorithm is proposed.The algorithm proposes a piece-wise integer coding scheme.And the cellular automata is introduced into the bat algorithm to study the information communicating and exchanging mechanism.The strategy of self-adaptive multi crossover operators is adopted to improve the robustness of the algorithm.To accelerate the convergence and maintain the population diversity,an elitist external archive is established.An iterative swap procedure is borrowed to improve the convergence accuracy.The simulation results show the proposed algorithm have a better performance in convergence rate and accuracy,which can achieve the optimization of the placement process to improve the assembly efficiency.

The successful development of the first reconfigurable transmission line maintenance robot “Dream-I”,with the autonomous walking and accurate positioning function on the lead wire.The task and object was described firstly,and then design the general robot platform,insulator replacement terminal and drainage plate bolts to fasten the end,the robot control system and the robot task planning were simulation analysis,and finally completed the on-line test and trial in the high voltage of the hall electric field voltage withstand test and the actual line.The experimental results show that the robot can complete the suspended insulator replacement and bolt fastening two tasks by replacing the end of the manipulator.

A single joint error model of service robot has been set up independently,which is based on MDH (Modified Denavit-Hartenberg) model,the distance between two points in space to measure the error absolute positioning accuracy of the robot,and combined with the establishment of a single joint error model,the kinematic calibration model based on distance error was deduced.The kinematics calibration model not only can simplify the measurement process,but also avoids coordinate conversion between measurement system and robot system,and improves measurement accuracy.Finally,combined with the decoupling of the service robot structure characteristics to select the scheme of the experimental measurement points,and use three coordinates measuring instrument measuring the terminal position.Experimental results show that the precision of the robot has been increased by more than 60%.

Using COMET L3D to get point cloud data of sheet metal parts,sheet metal pieces of physical model of the three-dimensional information into the computer can deal directly with high precision three-dimensional digital model,then using the point cloud data to reverse remodeling,sheet metal parts and in the process of reverse remodeling of surface reconstruction and accuracy control are analyzed in detail.Finally obtained the high precision sheet metal pieces of reconstruction model.Reverse engineering in the application of sheet metal parts design process to make up for the limitation of the traditional top-down design and the insufficiency,under the premise of guarantee accuracy rapid reconstruction of the implementation model,so as to shorten the development cycles of sheet metal parts design,reduce the design cost.

Aiming at the problem of service encapsulation for production equipment resources in cloud manufacturing,based on the comparative study of existing technology of the encapsulation of manufacturing resources,gave the manufacturing resource classification,analyzed the characteristics of production equipment resources and service technology,put forward the resource service encapsulation frame for production equipment in cloud manufacturing,set up a formal description model of production equipment resources,and the service encapsulation process of resources were studied systematically.Finally,the effectiveness and scientific nature of the proposed method is verified by an application example.

A full-automatic handing system of automobile hub is designed to study design approach and communication mode of full-automatic control system.S7-200 SMART is utilized to conduct logic control to manage integration communication of peripheral equipments,which consists of visual system,ABB industrial robot manipulator control system,automobile hub,photoelectric switches,load-unload conveyer line,control buttons,Human Machine Interface(HMI),indicator lights,safety gates and so on.The field debugging results show that the full-automatic handing system of automobile hub achieves rapid locating clamp of robot to precisely carry automobile hub from feeding line to blanking line.And HMI conducts the real time monitoring and alarm function,fully-functional and reasonable designing make this system easy to operate.Practice proves that the system meets the design requirements and improves the stability and reliability of production.

Suspension system is an important structure device for vehicle safety driving.Taking a heavy vehicle single trailing arm suspension as the research object,the explicit dynamic elastoplastic of the suspension system is analyzed by using the theory of stress wave propagation under three typical working conditions,by constructing model based on ABAQUS.Analysis result shows that:the stress under three different conditions are larger;dynamic load is the most important damage factor on suspension structure;the weld connecting and sharp corners has obvious stress concentration and plastic deformation;the suspension structure is relatively weak in the areas that the steering knuckle and steering longitudinal arm hinged joints.According to the strength and stiffness analysis results,the suspension structure was optimization designed,and verified by the test.The test result shows that the dynamic explicit elastic-plastic performance analysis method is practical and effective for calculating the stress and strain under the dynamic load condition.

The cross universal joint on the rolling mill is of great bearing capacity,high transmission efficiency,big transmission torque and steady transmission.Its main failure forms include breakage of joint axle,plastic indent,pitting and spalling in the surface of axle neck.The strengths of the spindle,joint axle and fork and other parameters are calculated and verified according to the practical requirements and the finite element analysis of the stress and contact pressure of the joints is made and the satisfactory parameters are obtained.Adopt reasonable machining process technology to produce satisfactory spindles and apply it in practical production.

Motorized spindle bearing-rotor system is interfered by various vibration exciting in the working process,this will seriously affect component machining accuracy and reliability.Used piezoelectric stack to interfere the dynamic vibration characteristics of motorized spindle bearing-rotor system and established the physical model containing the piezoelectric stack.The finite element method was also used to establish the dynamic electromechanical coupling model of motorized spindle bearing-rotor-piezoelectric stack system.Output feedback control was designed by Linear Quadratic Regulator (LQR) control method and adaptive vibration control of high speed motorized spindle bearing-rotor system was finally established.Control simulation was carried out by Matlab and results of the simulation indicated that this control method achieved obvious control effect in the motorized spindle vibration control with the integration of piezoelectric stack.

Study dynamic characteristic of beam system of CNC turret punch press by dynamic experiment,and analyse the characteristics of the displacement and acceleration of the beam according to the experimental results,to improve the dynamic characteristic of beam system.

Semi-opened impeller belong to the complicated curved surface parts,is widely used in centrifugal pump.It carries out the structure parameter calculation and drawing of a semi-opened impeller,then it creates the accurate 3D model by UG software,and analyzes the numerical control machining process of the impeller.Then it carries on programming and simulation of numerical control (NC) machining tool path for the impeller in UG software.Finally,the generated numerical control program is passed to the machining center for actual processing.In this way,a size accuracy and good surface quality semi-opened impeller is machined.

At present,the traditional expert system technology have problems in reasoning process aspect:incomplete part information extraction,knowledge acquisition and reasoning ability weakly.Use hybrid reasoning mechanism based on neural network and rule instead of traditional expert system can solve the problems.First,use feature technology to extract part information,converting it to characteristic matrix,as input of neural network expert system.Then,according to the characteristic matrix search reasoning strategy,and classify the network as accuracy,shape and heat treatment three types based on shaft parts characters,using the momentum vector-adaptive BP algorithm training network.Finally,elaborate the design and implementation of the hybrid system technology reasoning.

The scheduling problem of ship curved block has complex process and characteristic of spatio-temporal coupling,the lack of standard process and efficient method in formulating scheduling plan is bottleneck problem in shipbuilding.Proposed a scheduling method based on spatio-temporal constraint,it first build mathematical model contains spatio-temporal constraint,then use rules and decomposed strategy to design a reasonable and simple heuristic algorithm,finally,some curved blocks were simulated as example to validate the scheduling method.The result shows that the scheduling method which proposed performs well and can bring dramatic increase in block production efficiency and utility rate of work space.

It is important how to choose the grinding parameters,as the cost of grinding is very high.The influence of grinding parameters to the surface roughness and the production efficiency was discussed.Aimed at the cutting parameters of grinding for outer cylindrical grinding,an optimization model which is based on the minimum process cost of grinding was established.The model is constrained by roughness of the machined surface,the stiffness of the part,the power of the grinding machine,the parameters of the grinding machine,and the grinding allowance.The variables of the optimization includes the grinding allowance,the lengthwise travel rate of table and the depth of cut.Finally,an experiment case of a motor shaft was performed to verify the validity of the optimization model,compared with the traditional methods,process costs have been reduced by almost 19%.

Aiming at the problem of low efficiency and space tension in the process of shipbuilding.Based on the field research,in order to reduce derivative instructions generated by the process of path clearing moving,a series of implementation rules about the selection of the target three stage site and the path optimization method of the entry and exit are put forward.Considering surplus working days and resistance coefficient of field,combining the derivative instructions and yard’s dynamic adjustment,realize the dynamic optimization of the whole space while minimizing the number of moving times in the process of continuous operation of the yard.And the corresponding calculation method and process are designed,after repeated verification obtained in site pile of real rate reached an average of 85.9% of cases,average proportion of derivative instructions reduced to 36.93%,significantly lower than the conclusion of practical experience to prove the effectiveness of the rules.

In order to overcome the shortages of the traditional association rules in the steel industry in the field of information diversity,ambiguity and gradation. On the basis of traditional hierarchical association rules mining algorithm,introduces the weighted extension while establishing a hierarchical relation between fuzzy memberships,and proposes a weighted fuzzy hierarchy association rules algorithm.At the same time,the algorithm is applied to the association between defects and defects in the process of cold strip rolling.The experimental results showed that,this algorithm can not only dig the relationship between defects,but also dig out the corresponding relationship between different defects and its different reasons.It make up for the shortages of that traditional mining algorithms can only be mining the data at same category.

In order to solve the problem of information inconsistencies in 3D machining process planning,a 3D process design method of machining was proposed based on Model-Based Definition (MBD).The 3D machining process planning frame based on MBD processing element were established after concept of MBD processing element was given.Processing element generating method and process decision was researched.Boolean operators and replication technology are used process model to found the process model by MBD processing element.A machining process design system was developed based MBD processing element.The effectiveness and correctness of proposed method was verified by the example of an process design for boxes parts.

In order to eliminate the interference signal of the complex pneumatic control system,a signal processing scheme is proposed.According to the diagram of full function,the type of the signal is judged.And then,using one-way roller lever valve to change recurring long signal into short signal,then using the reproducing signal and the sending condition signal to eliminate the reproduction signal interference;at last,using the double pressure valve to eliminate the signal interference.The experimental results show that the proposed method is feasible and effective.

Based on the imaging feature of SOP components,in order to limit the number of the target area,reduce the computing element angle computation,adopting the algorithm of minimum enclosing rectangle to quickly gain the center coordinates,the approximate area and the approximate perimeter of the target areas,searching out the destination rectangle and calculate the actual center element based on rectangular area and perimeter constraints.Then searching out the single target in the center of the rectangle based on adjacency matrix search algorithm.Finally calculated the center of elements by least squares fitting line .The method is simple and efficient,effectively reduce the computational complexity in the process of element identification.The experimental results show that the algorithm is to ensure high precision positioning for SOP,and at the same time,it can realize high efficiency of component placement.

Remote mobile monitoring system of aluminum strip cold rolling based on Android was developed.Based on C/S architecture,server application is developed in the LabVIEW software,and it gets industrial site datas by OPC data exchange communication technology.The client adopts the idea of modularization and object-oriented and it is developed in the development environment of Basic4Android +Java JDK+ Android SDK.The client can realize the function of user authentication,network communication,and get real-time datas anytime,anywhere.And then it has friendly interactive interface to display data.The experiment results show that the system runs stable,and the system realizes the purpose of remote mobile monitoring of aluminum strip cold rolling.

To overcome the disadvantage of traditional methods in solving the problem of mechanical optimization,a Multi-Swarm Bacterial Foraging Optimization (MSBFO) algorithm was proposed,which uses the idea of commensalism in nature.In the algorithm,two swarms were used to represent the feasible population and infeasible population,to simulate the co-evolution,in order to solve the constrained mechanical design optimization problem.Adaptive step lengths in chemotaxis and equilibrium strategy in reproduction are also used in MSBFO.To validate the optimization design ability of proposed algorithm,tested it on instances of pressure vessel design and welded beam optimization design,and compared its results with several other algorithms.Test results show that the proposed MSBFO algorithm outperforms most comparison algorithms both on the optimal value and the stability of the results,and can be used for mechanical design optimization very well.

For one unit repairable system having a normal distribution of products quality failure,considering random shift,a joint economic design approach to Variable Sampling Size and Control Limits(VSSCL) X-bar control chart and preventive maintenance policies is discussed.Firstly,an integrated frame structure on VSSCL X-bar control chart and preventive maintenance policies is developed to reveal the running coupling mechanism between control chart and preventive maintenance policies.Secondly,for the integrated frame structure,probabilities models of four repair events which can lead to system renew are given based on VSSCL X-bar control chart and the system condition characteristic parameters.Then,a mathematical decision model on joint economic design for dynamic SPC and preventive maintenance policies is presented to find the minimization average cost per unit time according to renew theory and the law of total probability decomposition,and a comparison shows that the proposed joint economic design model has a lower average cost per unit time than previous independent economic design model.Finally,a sensitivity analysis for model parameters was conducted by using orthogonal regression design.

Minimally invasive surgical robot technology as a new research field,has small wound,relieve pain,surgery after recovery fast and many other advantages,so in surgery can be used and rapidly developed.The main research results of domestic and foreign in recent years are analyzed and introduced,and the key technology of minimally invasive surgical robot is analyzed.