Technology readiness has been widely used in complex structure product manufacturing,such as aeronautics and astronautics.Critical Technical Element (CTE) identification is the premise and foundation for technology readiness levels evaluation.To improve the deficiencies of traditional CTE identification method which relies on expert experience greatly,requires sufficient information and prior knowledge,has great uncertainty and so on,a new CTE identification method is proposed for the technology readiness levels evaluation which is based on rough set theory and information entropy theory.First,the theory of the attribute significance in rough sets is introduced to CTE identify,the importance degree of key technology is evaluated using the attribute significance.Secondly,the information entropy theory is introduced to modify the expert evaluation result for weakening the uncertain factors during the evaluation process.Then,the key technologies in key position of product development are screened out from the technology set using the quantified index of technology importance.Finally,the validity of the method is proved with an instance,the instance shows that the method can offer quantitative importance index of technology with strong operationally,engineering value.

In order to satisty the requirements of making the surface of polycrystalline diamond compact after finishing bright and clean,like mirror surface,based on the orthogonal test method,it is to optimize polycrystalline diamond compact finishing process parameters combination,using the method of range analysis to process data,and draw test index and the relationship between each experimental factor graph to obtain the influence degree of various factors on the surface roughness value,and as a basis for optimization parameters,optimizing the parameters of polycrystalline diamond compact process optimization research.Research showed that the rotation speed and the finishing time put greater impact on the working surface quality,and the influence degree of various factors on the surface roughness size in order from large to small is:polishing disk rotational speed,the time,the polishing pressure,and the polishing liquid abrasive granularity.Using the optimized processing test for the optimal process parameters combination,when lapping and pressure is 90 kPa,polishing disk rotational speed of 1 200 r/min,polishing liquid abrasive particle size is 1 μm,and polishing time for 30 min,got the quality of the surface roughness Ra is 0.019 μm surface,mirror surface treatment effect (Ra<0.02 μm)was realized.

In order to research the dynamic damping performance of square steel tube filled with foam aluminum,the damping properties of empty square tube,two forms of foam aluminum filling square tube (with glue and without glue)are studied by using experiment and simulation method,respectively.And the mechanism of damping is also analyzed.The results show that the foam aluminum filling can significantly improve the damping performance of empty square tube.And the adhesive connection mode has a bad influence on the damping performance of square tube filled with foam aluminum.

Remanufacturing is a key technology to restore the original size and performance of the waste components.For this purpose,the remanufacturing of used car crane formulate a kind of new arm washing equipment which can adapt to different shapes of surface and different heights.The relationship between the jet striking force and the adhesion of the paint film was analyzed.The effects of the spray nozzle pressure and the feed rate of the washer on the cleaning efficiency were studied.Application of high efficient washing technology with high pressure water jet to boom cleaning test.The experimental results show that the cleaning device can accomplish the cleaning task well when the nozzle diameter is 0.4 mm,the target distance is 20 mm,the outlet pressure is 180 MPa,and the cleaning device travel speed is 0.6 m/min,and meets the requirements of the crane boom of construction machinery.Manufacturing cleaning process requirements.This washing equipment can solve the problem of cleaning the surface of auto-crane arms,which lays the foundation for the subsequent nondestructive testing and repairing of the crane arms.

The tumor localization interference caused by human respiratory movement cannot be ignored during stereotactic radiotherapy robot treat lung tumor.In order to compensate for respiratory movement and improve the precision of radiotherapy,the main method is real-time tracking through establish the correlation model between internal tumor and external surrogates,and use the model predict the position of the tumor from the movements of the surrogates,thus regulates mechanical arm for precise radiotherapy.For respiratory motion tracking model with lung tumor,designed a three dimensional respiratory motion simulator,this simulator can be stable simulate the nonlinear and lagging relationship between the tumor motion part and the surrogate motion part,which provides data source and verification platform for tumor respiratory motion tracking model in stereotactic radiotherapy.

Vibration characteristics of human-seat system under the driving condition were researched utilizing vibration comfort experiment.The result showed that in addition to seat vibration,the head vibration and longitudinal vibration of backrest also had great influence to ride comfort.The lumped-parameter human-seat models’ parameters were identified combining the floor-to-seat transmissibility and floortohead transmissibility experiment data of human-seat system,respectively,by using genetic algorithm and matlab program.The reasonability of model parameters were verification by virtue of apparent mass,and each model’s goodness of fit index were analyzed by comparing the transmissibility of the models computed by the identification parameters with the experiment transmissibility.The result indicated that 3 degree-of-free in parallel human-seat system model had higher accuracy than any other models,which was suitable for prediction real vehicle vibration response.

In order to observe the movement of unchoking 3D printing nozzle device,the three-dimensional entity model to various parts of device was established by using UG software,and virtual assembly the parts for device’s motion simulation.It is very intuitive to observe the specific process of unchoking 3D printing nozzle device,and the physical prototype was developed by this means,which provides basis and useful reference for optimize the unchoking 3D printing nozzle device.

Color information is an essential element of the object,the current FDM 3D printer can not complete color 3D printing,thus impeding the 3D printouts visual expression.To solve this problem,on the basis of in-depth research FDM 3D printer works,the traditional 3D printer extrusion equipment has been improved, a color 3D printer extrusion device is designed based on CMYK-W.By printing test,compared color information and standards colorimetric card, verified color 3D printer extrusion device meet the design requirements,provides an effective solution for the further study of color 3D printing technology.

Taking the DCT factory of GETRAG (Jiangxi)Transmission Co.Ltd.as an example,studying the system configuration of “water spider” under scheduling strategy of one center and multiple partition (1CNP)based on the characteristics of operation for "water spider".Building eight simulation models based on Plant Simulation software,then doing 24 groups of simulation experiment and getting 24 species of output parameters about finishing same handling task for the “water spider”.Seeing the input and output parameters of simulation as the input and output variables of DEA model.Based on super efficiency DEA evaluation model to evaluate efficiency of 24 kinds of configuration,getting the optimal configuration is that part one allocate three “water spiders”,part two allocate one “water spiders”,and the availability of “water spiders” set as 100 %.

The front axle is one of the most important parts of truck bearing,which bears loading and torque in different directions.Aiming at checking a new front axle design safety and reliability,the front axle was mechanics analysed and the loading was obtained in the condition of bump,brake,steer and steer-brake.The front axle strength was analysed based on theoretical analysis loading and finite element method by adopting HyperMesh,the result showed that the maximum stress were 379.0,490.9,267.0 and 533.5 MPa in the condition of bump,brake,steer and steer-brake,they were less than yield strength,but safety coefficients of brake and steer-brake condition were less than 1.2,they could not meet the design requirements.Bench test was carried out on the front axle based on four typical working condition,the test point strain datas were obtained,and they were converted to stress by adopting Ncode software.The bench test results showed that test values were close to finite element analysis values,their error rate were less than 10 %.The analysis results showed that the maximum stress were respectively reduced by 21.3 %,17.0 %,28.4 % and 17.3 % in the four typical working condition by smoothing the connections of spring seat and the front beam.The safety coefficients of brake and steer-brake condition were more than 1.2 after optimization,they could meet the design requirements.

Aiming at the problem of lacking climbing ability of a pure electric van in mountainous city road,analyzes the parameters matching method of main components of the dynamic system which affects the vehicle performance.Taking the driving distance and the maximum climbing degree as goals,using DOE orthogonal test method to optimize the transmission ratio.The vehicle model is established and the dynamic simulation results of optimization before and after are compared and analyzed by the Cruise software.The results show that after optimization,the climbing ability of the van is significantly enhanced,and the acceleration performance is also slightly improved.

The finite element software ANSYS needs to be run repeatedly in the excavator boom structure optimization process,making the optimization process cumbersome and inefficient. To address this problem, an intelligent optimization model for four typical stress conditions of the excavator boom was proposed. Stress census section was determined through setting rules in optimal design software of excavator boom and establishing a stress prediction model for the excavator boom based on BP network. The small and medium excavator booms were used as examples and stress prediction models were established to improve the optimization efficiency of the boom structure. The results show that predict stress was in consistent with the experimental data with error less than 6.08 %.

Aiming at the problem of white noise,the vehicle passive suspension model with four degrees of freedom is created,and the dynamic equation of the vehicle’s vertical direction is derived.The hybrid objective function is constructed,and the improved particle swarm optimization algorithm is used to optimize the parameters of the passive suspension model of four degrees of freedom quarter vehicle.The vehicle passive suspension system simulation model was established,and the dynamic simulation was carried out by Matlab/Simulink software at different speed,and the simulation results are compared with those before optimization.The simulation results show that the root mean square after optimization of vehicle passive vertical suspension driver head acceleration,sprung vertical stroke and unsprung vertical displacement of the maximum value were reduced by 51 %,45.4 % and 40.7 %,and the peak vibration of vehicle vertical direction was also reduced.Improved particle swarm optimization algorithm is used to optimize the vehicle passive suspension system,which can improve the stability of vehicle driving and improve the ride comfort of the vehicle.

To meet the demand of non-standard manufacturing enterprise,finished the data analysis and processing,order forecast,working hour,establishing the original simulation model and improvement strategy by using Arena software.It provides reliable improvement strategies for the enterprises,so the enterprise can achieve the elimination of production bottlenecks,improve production efficiency targets.The analysis shows that the simulation model successfully simulates the actual production process,through the implementation of strategy on the manufacturing system the solution can meet the actual needs of the enterprise.

Taking a certain luffing jib tower crane as the research object,it used finite element analysis software ANSYS to obtain the dynamic response under seismic excitation.Choosing El-Centro as the input,it obtained response curve of four characteristic nodes,which showed the variation trend between node displacement amplitude and jib elevation angle under seismic excitation.According to the severity rating table of reliability designed a sensitive reference table,it expressed the relationship between displacement amplitude and jib elevation angle.The higher the sensitivity,the faster the change of node displacement amplitude along with the elevation angle changes under seismic load.Calculation results show that the X-direction displacement of tower crane rapidly grows with the elevation angle increases,the difference between the maximum value and the minimum value is 14 times,thus it belongs to high sensitivity that X-direction displacement is the main displacement of tower crane.Therefore,jib elevation angle should be in low-angle state to relieve seismic influence when the tower crane is non-working state.

The hydrostatic extrusion process of magnesium alloy bars with two hole,three hole and four hole die was analyzed by DEFORM-3D finite element software.The stiffness and strength of the porous die were analyzed through the MSC.MARC software.On this basis,the influence of the structure design of the four hole die on the forming process was analyzed.Combined with orthogonal test,the influence of the location of die hole,die type,calibrating strap lengths and die temperature on the extrusion force and the uniformity of flow velocity of the outlet were analyzed.The selection of a better structure design method to realize the forming of the porous die bar was analyzed.

The End Life of Vechiles (ELV) was needed to be located before using the windshield automatic cutting machine to cut off the windshield.To give a brief review of various methods of aligning and point out the application limitation in ELV automatically aligning.Based upon the introductions,a new method was proposed,utilizing computer vision technology by setting up a specific plane with calibration paper on the top of ELV.Taking the pictures of the plane and calibration paper with a single camera,and getting the pixel coordinates of specific points,then obtained the world coordinate according to the calibration formula.Computing offset distance and rotation angle of ELV by comparing the world coordinate of specific points with standard.Experiment results indicated that the method was of high efficiency,and had value of popularization and application.

Analysis of the structure of the process system,which plays an important role in the realization of industrial intelligent way,and given the overall system architecture diagram.On this basis,further elaborated the main module of structured process systems need to be developed,which can achieve the function.And detailed description what implement various functions of the module design and interface design in Teamcenter environment.

Using nano-CaF₂ as a solid lubricant,three kind of nano-modified Al₂O₃/TiB₂/CaF₂ self-lubricating ceramic tools with different contents of CaF₂,ATF1,ATF5,ATF10,were prepared,and used in the 45 steel and 40Cr cutting tests.The influences on the relations between cutting temperatures and cutting powers,rake face friction factors,and cutting properties of different tools of CaF₂ contents and cutting temperature were studied,the morphology of tools’ flank wear and rake wear were observed by SEM,proving nano-modified self-lubricating ceramic tools have self-lubricating properties,and explaining the mechanism of tools’ self-lubricating.The results showed that the CaF₂ content and cutting temperature both have impacts on the self-lubricating properties of self-lubricating tool.In 45 steel cutting experiment,the cutting temperature was high,tools’ CaF₂ contents were inversely proportional to their total amount of material removalis,tools’ self-lubricating was not obvious.In 40Cr cutting tests,the cutting temperature was low,compared with that of ATF1,the friction factors of the rake face of the ATF5 and ATF10 cutting tools with higher CaF₂ contents were significantly decreased,ATF10 tool whose CaF₂ content of the highest had the highest total amount of material removal,showing an obvious self-lubricating property and best cutting property.

In injection molding processing,conformal cooling channels can effectively reduce the mold temperature,improve the quality of products.Multi segment curved holes constitute the conformal cooling channel.Based on the principle of Electrochemical Machining (ECM),presenting self-guided curved hole processing method.Researching the processing principle and curvature control principle of the curved hole,designing curved hole machining device,developing the CNC system based on Contex M3 ARM microcontroller,achieving real-time control for self-guided curved hole ECM and human-computer interaction.

Thermostat lower casing have many problems,like buckling deformation,unequal shrinkage and so on.To solve these problems,use the Pro/E software and the Moldflow software to establish 3D models and make cavity design of the thermostat lowering casing.Moreover,EMX is applied for formwork addition to accomplish the design of hot runner injection mold.The effective combination of structure of innovative design and hot runner technology could streamline the mold structure and compact the layout structure to result in a better forming quality.

In order to realize the real time,non-contact and high precision measurement of the coating thickness of the small diameter solid rocket motor,a non-contact measurement system using laser displacement sensor is designed.The system is combined with the servo control system,the large length cantilever beam,the laser displacement sensor and the computer control system to ensure that the system can accurately measure the thickness of the coated layer in real time.It mainly introduces the structure of the system,the detection principle,the error analysis and some experimental analysis.The system has simple operation,high accuracy and good stability.It can realize the real-time and on-line,non-contact and high precision measurement of the thickness of the coating layer of the small diameter solid rocket motor.

The vertical static stiffness problem of vehicle suspension air spring finite element model has been established,and the nonlinearity of geometry and state,the material,as well as the air-solid coupling,are all analyzed theoretically.The vertical static models characteristics are analyzed which is powerful in nonlinearity.The analysis results show that the simulation model validated through comparing with experimental data.Parameters influencing static vertical stiffness of the spring such as pressure,cord angle,distance between cord as well as layers of the fiber layer are analyzed.The proposed modelling and analysis methods in the guidance of the air spring prototype design were proposed.

Designed an energy-efficient,high-reliability wireless system for measuring torsion,revolution and pneumatic pressure in the wind tunnel testing of the wind turbine,based on the platform of the sensor network formed by all kinds of sensors and ZigBee nodes.Introduced the measuring method of sensors and the wireless method of the datum-transmitted,and provided the overall designed scheme,the hardware designed diagram of sensor nodes,the program flow diagram of sensor nodes.It is verified that the testing result is much more than be hoped.

In view of all kinds of constraints,such as the availability of vehicle prototypes,capacity of constraint resource,precedence constraints,applies Mixed Integer Linear Programming(MILP) and Constraint Programming (CP) to adderess a problem in the automobile industry where lots of tests must be performed on prototypes of a vehicle before starting its mass production.The objective of MILP model is to estimate the number of required prototypes and CP model aims to minimize the makespan.This study shows the scheme by the Gantt chart.The paper used CPLEX Optimization Studio to formulate and solve two models.The result fully proves that MILP easily find the estimate value and constraint programming technology has the superiority and effectiveness as scheduling problem.

The RV reducer is used as the research object,first of all,it uses FTA to analyze it,the RV reducer reliability model and the fault tree diagram is established,and qualitative and quantitative analysis is carried out according to the fault tree,the factors affecting its reliability are determined.Then,FMEA is used to analyze the planet gear and the planet gear of the key parts of the RV reducer,the main failure modes and their effects are clearly understood,it is based on the specific reasons for the failure of components to develop preventive measures,it provides a theoretical basis for the RV reducer of the state diagnosis,the fault diagnosis and to improve the accuracy of fault diagnosis.

Spring strip is a key component of sliding sleeve valve used in the injection-production combination technology of heavy oil thermal recovery.It can drive the sliding sleeve movement and achieve the function of open and close of sliding sleeve valve.Using the method of equal effects,spring strip was equivalent to arched beam with both ends fixed.And the mathematical model for maximum deflection of spring strip was deduced based on the superposition principle.The finite element analysis was used to simulate the strength and deformation of spring strip via ABAQUS software to make sure the rationality of the design of spring strip.Did the finite element analysis of various spring strips in the sliding sleeve valve series and compared with calculation results of mathematical model.And then defined the correction factor based on the error magnitude to achieve the optimization of mathematical model.Finally the accuracy of the mathematical model for maximum deflection of spring strip was verified by experiment and which provides the theoretical basis for the design of similar spring strips.

To address the problems of low energy usage ratio and poor continuity for the traditional power generation platform,based on the introduction of wave and wind energy complementary generation system,a new type of power coupling mechanism using differential planetary gears as the core components was designed in order to implement the comprehensive utilization of wind-wave energy and solve the problem of the wind-wave energy coupling.The coupled movement characteristics was simulated by Matlab software,the actual performance of coupling mechanism was verified through the physical prototype test.

Firstly,the background of the modern manufacturing paradigm was briefly summarized;and the evolution of the modern manufacturing paradigm and the informationization of manufacturing industry were reviewed.Then the superficial understanding of “Industry 4.0” was proposed,and the research and application progresses of Chinese Aerospace Science and Industry Corporation were presented.The conclusion is that “Industry 4.0” came from the rapid development of the Information and Communication Technology(ICT) such as cloud computing,internet of things / services,artificial intelligent,big data,and “Industry 4.0” is a new paradigm of intelligent manufacturing which follows with the paradigm of computer integrated manufacturing,concurrent engineering and agile manufacturing.