In order to evaluate the particle damping double layer vibration isolation system comprehensively,a new vibration reduction effect evaluation method is proposed.This method defines the particle damping double layer vibration isolation effect index as the sum of the vibration level difference and particle damping insertion loss.The acceleration signal of the lower base,the middle layer raft and the upper unit of the double layer vibration isolation system under different vibration conditions is measured by experiments.The evaluation method is used for experimental analysis.The experimental results show that when the particle filling ratio is 70 %,the damping effect is the best,and the damping ratio reaches 33 % in the resonant frequency band.The particle damping improves the vibration reduction effect of the double layer vibration isolation system.The experimental results verify the effectiveness of the evaluation method.

In order to collect high-density data of elevator systems energy consumption and operating status in the green building,puts forward elevator control system research in the green building.As a precondition,ARM-controlled four-story elevator model as an energy monitoring object is established.Based on this object for energy consumption detection system design,real-time acquisition of energy consumption data for elevator operation,and through the remote communication technology transmit the elevator energy consumption data to upper monitor,in order to facilitate store,query and analyze the energy consumption data.Elevator energy consumption remote monitoring system is therefore provide the basis for the assessment of elevator energy consumption,promote green building more energy efficient,has important theoretical research significance and practical value.

The temperature features and time domain features of yaw damper are analyzed based on test,and the influence of the oil temperature of yaw damper on the vehicle safety is simulated with SIMPACK software.Temperature feature test shows that the energy absorbed by yaw damper,the dynamic damping and stiffness of damper increase as the temperature decreases.Low temperature influence on dynamic feature of damper is bigger than high temperature.There is no obvious change in the dynamic characteristics of yaw damper within 5h simulated test,whether in low temperature or normal temperature.The simulation result shows that oil temperature of yaw damper has less influence on vehicle safety.

In order to study the dynamic characteristics of automobile radiator,according to the measured amplitude frequency characteristic curve of the radiator,the radiator is simplified to three degree of freedom dynamics model,using orthogonal polynomial fitting method and physical parameters step by step optimization method for the identification of dynamic model.The research results show that the amplitude frequency characteristic curve of the radiator dynamics identification of the model parameters is consistent with the actual test,the average error of the natural frequency is 5.1 %,the average error of the amplitude is 6.9 %.

According to the actual structure characteristics of oil pump parameters,the three-dimensional geometric model of internal flow field of the pump is established by Proe software and mesh with software ICEM,then the internal flow field of the pump were analyzed using the FLUENT software,considering the oil in the theory of air content,using the power law model to describe the rheological properties of non-newtonian fluid constitutive equation for power-law fluid,the pressure velocity coupling with SIMPLEC scheme,turbulent kinetic energy and dissipation rate using two order upwind discretization.The influence of gas content,fluid properties and flow characteristics of oil trapped inside the pump were analyzed by the numerical calculation,the pressure pulsation in 8 % and 10 % content of air are analyzed.The results show that when the air content is 8 %,the influence of pressure in the trapped oil area is higher,and the pressure fluctuation is greater in the nearer to the trapped oil region.It means the magnitude of the pressure pulsation can be expressed as T₁<T₂<T₄<T₃ at the outlet section of the trapped oil area, at the inlet section of the trapped oil area, T₁₁<T₈<T₁₀<T₉. For the trapped oil area,the peak value of the pressure fluctuation in a gear rotating cycle is equal to the number of teeth,and the main frequency is 0.1 times of the gear meshing frequency.The greater the gas content in the trapped oil zone,the smaller the amplitude of the pressure fluctuation.

Based on multi-body dynamics software SIMPACK,the simulation model of the modern tram with four modules is established.Considering the influence of CHN60 general rail and 60R2 groove rail,the nonlinear motion stability,linear running stability and curve passing ability of the tramcar are studied.The results show that the vehicles with two types of rail have good dynamic performance;Although the nonlinear stability and the stability of CHN60 rail vehicles are better than 60R2 groove rail vehicles,they differ slightly.The groove rail vehicle has better curving performance,and the groove rail section has a certain function in the guard rail,therefore,it is suggested to use groove rail for rail type selection.

Aiming at the problems existing in the CNC transverse shear line of silicon steel sheet,a multi-shear and multi-punch CNC transverse shear line research is carried out for the purpose of realizing multi-shear and multi-punching,flexible system,reducing programming quantity and labor intensity.The mechanical structure and process flow of transverse shear line are analyzed,and the definition of multi-shear and multi-punch is given.The TPN model is established based on the time Petri net,and the relationship of concurrency and conflict is analyzed.The mathematical model with least process step,minimum total moving distance of feed axis and minimum return material is set up,the ordered n-tuple of the multi-step machining is arranged by the parallelism of the transverse shear line.The overall algorithm flow is given,with emphasis on the design and calculation of the algorithm.Finally,an example is given to demonstrate the feasibility and effectiveness of the multi-shear and multi-punch CNC transverse shear line machining model.

Green manufacturing is a comprehensive consideration of resource consumption and environmental impact in the process of machining,and green evaluation is an important part of green manufacturing.According to the steps of Life Cycle Assessment (LCA),the machining process of elevator parts is evaluated in an environment-friendly way.Data Envelopment Analysis (DEA) was used to evaluate the relative green effectiveness of each process.It treats each process as a decision making unit,and builds a mathematical model of multiple inputs and outputs.It not only gives the green degree of each process,but also points out the main factors affecting the green degree and makes improvement.The effectiveness of this method is verified by the green evaluation of each process in the process of the machining process of elevator parts of an enterprise.

Hydraulic drilling machine will produce blast-hole deflection in the drilling process;it will seriously hamper the drilling efficiency.The engineering practice shows that the drilling force is mainly caused by the uneven drilling-hole deviation.Therefore,to promote the design of a pressure control valve is applied for controlling the drill propulsion mechanism of propulsion.The boost pressure control valve system by theoretical analysis and mathematical modeling and simulation analysis,the simulation results show that the boost pressure control valve system can automatically adjust the outlet pressure of work,to achieve its desired effect.In order to control the drill drilling thrust propulsion mechanism to improve the effect of rock drilling provides a feasible technical ideas.

According to design requirements,in order to solve the problem of operating concrete wet spraying machinery to substitute for manual tools under an abominable tunnel construction environment,certain manipulator machine had been designed.Three sections telescopic boom are key component of the manipulator machine and it had a conservative design with surplus strength and stiffness.Parameter sensitivity analysis are usually regarded as basis for completing lightweight design,including reducing structure weight and manufacture cost,making good use of materials’ mechanical properties,etc.Considering strength and stiffness as constraint conditions,structure weight as design objective,researched the effects of 6 variables on design indexes.First of all,utilizing software MATLAB established the BP neural network model with 6 design variables,3 constraint conditions and 1 design objective.After that,integrating the multidisciplinary optimization design software ISIGHT and software MATLAB achieved the Monte Carlo numerical simulation for parameter sensitivity analysis.By this analysis the differences parameters sensitivity are clarified,which will provide great reference for the design of similar structures.

The non-contact torque transmission mechanism and the advantages of the longitudinal coupled permanent magnet coupler with adjustable speed system was introduced.Based on the 3D moving eddy current field,the complete finite element model of the single cylindrical copper sleeve permanent magnet coupler was established,then the magnetic field and eddy current field were analyzed.The distribution of magnetic field and eddy current field were acquired,and the key parameters were analyzed by Ansoft Maxwell software,such as the number of magnetic poles,the thickness of the permanent magnet,the thickness of cylindrical copper sleeve and the air-gap,which affect eddy current density.Based on this,the distribution of the coupling force between the permanent magnetic field and eddy current field was analyzed,the problem of radial force imbalance was solved.The prototype trial-production of the permanent magnet coupler with double copper sleeves were presented by choosing four sets of different structural parameters,and the experiments were carried out,the results of the simulation and the experimental value were compared to verify the correctness of the finite element analysis and transmission characteristics research method.

In order to judge the stability and reliability of safety frame structure for wheeled tractors,established the security frame prototype geometric model according to the method and rule specified by GB/T 19498—2004 and GB/T 1591—2008,applied with MIDAS software for longitudinal and lateral loading finite element analysis,then analyzed the static strength of the prototype,verified the accuracy and effectiveness of analysis model,guided and improved the series of products design of security frame,realized the optimization of product structure,saved the cost and improved the competitiveness of enterprise.

With the development of digital medical treatment,requirements of human body CAD modeling are improved.Summarized and analyzed the existing methods of reverse modeling,and proposed a non-feature modeling method based on division of boundary to create human body CAD model,and the general process and the benefits of this approach are detailed.With the reverse modeling software Geomagic Studio and SolidWorks as platform,the advantage of the approach is verified through application and error analysis of the CAD models with in vitro and vivo feature,which has positive significance to achieve accurate and personalized digital medical treatment.

Propose a path planning method based on improving artificial potential field,aiming at solving the problem of intelligent obstacle avoidance path planning for coal sampling arm.According to the working characteristics of the sampling arm,a kind of characterization method of pose information is constructed,and a virtual simulation model between sampling arm and obstacle is established.Taking the sampling arm joint space as the search space,and the minimum potential energy as the objective function,the obstacle avoidance path planning is realized by improving the artificial potential field method.The joint limit,link collision and obstacle safety distance information were taken into account for the planning process.The algorithm sets a virtual slope to prevent planning from falling into local minimum.At last,the validity and feasibility of the proposed method are verified by simulation experiments.

Design a robot that can remove debris for high voltage transmission lines,and its main body includes mechanical mechanism and controller system.According to the high pressure transmission line to clear the debris operation needs,designed to remove the debris robot mechanical mechanism.As the removal mechanism of mechanical freedom is high,the overall weight,to the robot obstacle difficult.The design of the cleaning mechanism is adopted to optimize the design of the removal mechanism to reduce the number of motor drives and to reduce the overall weight of the robot.It provides a method to alleviate the difficulties of the robot.According to the requirements of debris control,the software and hardware of the robot control system are designed,and the robot removal mechanism is tested with S3C6410 single chip microcomputer.The result is in accordance with the design requirements.

In order to realize the recognition and localization of overlapping citrus objects, a method for recognizing and locating overlapping citrus objects based on convex shell and distance transform is proposed. The method divides the target by extracting the center of the recessed area where the target convex shell and the target are subtracted. Then the segmented target center of gravity is extracted by the distance transformation theory, and the target picking center is obtained to realize the positioning of overlapping fruits. This method is compared with the traditional Hough method. The experimental results show that the average positioning error of this method is 1.58 %, which is 4.72 % lower than that of Hough method, which significantly improves the positioning accuracy and provides a new idea for the recognition and localization of overlapping fruit targets.

A full-scale ANSYS model of one UAV wing was developed to carry out Finite Element Analysis(FEA).Nonlinear contact algorithm was performed to mainly study the effects of algorithm types with different normal stiffness factors and penetration tolerances on the iteration number and the model stiffness.Deformation process of the wing under a compressive loading condition was directly investigated by using the Three-Dimensional Digital Image Correlation(3D-DIC) technique.The numerical results agree well with experimental measurements,showing that the finite element model is rational.Finally,the stress distributions of wing skin and internal components were predicted,which provided a beneficial reference for further modifications.

In order to meet the requirements of intelligent manufacturing development,enterprises need to make full use of internal and external resources and partners,to form products satisfied the market.This requires companies to have an integrated,shared,collaborative,open and flexible platform.So put forward the architecture of intelligent manufacturing system,bring out the concept of intelligent manufacturing support platform(referred to as “platform”),and set up the software framework of the platform.The platform provides the basic ability and the open software APP development environment for the intelligent manufacturing ecosystem,which can provide reference and support for the equipment manufacturing enterprise to construct the intelligent manufacturing system.

Based on the existing literature established one dimensional analytical model of acoustic characteristics of perforated tube dissipative mufflers,combining the traditional transfer matrix method and the precise integration method,puts forward a new transfer matrix method,and applied to analyzing the acoustic characteristics of straight through perforated tube dissipative mufflers.Comparison of analysis results between the related reference and the Finite Element Method(FEM),illustrates that the new transfer matrix method can effectively calculate the acoustic characteristics of perforated tube mufflers,and improves the computational efficiency.The new transfer matrix method was applied to analyze the structure parameters of this kind of the mufflers on the effect of transmission loss of sound,provides a more simple and convenient means for studying of the mufflers.

Aiming at the problem that the side collision is large in traffic accidents and the high mortality rate,the computer simulation method is used to study protective effect of side curtain airbag.The CAD model of curtain airbag was designed by CATIA,and validity of the model was verified by static initiation and dynamic impact experiment.In the MADYMO,the occupant side collision control system and the positive control system were established by using the PSM sub-structure method.The experiment was carried out to optimize the head,and the acceleration curve of the dummy head was obtained.The results show that it is good for protective effect of the curtain airbag on the dummy,which provides a theoretical basis for the popularization of the curtain airbag.

As a kind of nickel-copper alloy,Monel has been widely used in aviation and space industries,and Electrochemical Machining(ECM) has unique advantages in porous structures machining of this high-temperature alloy because of its excellent properties.In order to improve the accuracy and stability of ECM,studies about electrolyte have been paid increasing attention.Trough the test of potentiodynamic polarization curves of Monel material,the composition and the proportion of the electrolyte are chosen by analyzing the polarization curves.Then validates experimentally on the effect of the complex reagent to enhance the machining precision and stability of ECM.

Analyzes the characteristics of sheet metal parts of a thermoelectric cooling device,and introduces the basic process of sheet metal parts design by using Creo Parametric 3.0,and pointes out the advantages of the modern design method.As an example,the key technologies of sheet metal parts design using of Creo software parts module are analyzed.

There were some prombles in the the products quality inspection process of the displacement air compressor,for instance the lack of volume flow measurement,uncertainty analysis and test method integrallty and systematically.Thus researched flow testing method for displacement air compressor based on the ASME nozzle flow measurement method,which can be used to caculate volume flow when the performace parameters such as the atmospheric pressure,the first grade suction temperature,the nozzle upstream gas temperature and the nozzle pressure difference et al,were gotten by performance tests.At the same time,the uncertainty of flow measurment results also can be obtained.Three types displacement air compressor of one compressor manufacturing company,ie DG22HA type,JG22HA type and LG22A type were taken as an example for application of the ASME nozzle flow measurement method.Their volume flows were 3.37,3.33 and 3.43 m³/min,and their uncertainties were 0.016,0.016 and 0.017 respectively.Results show that the method can accurately obtain the volume flow of compressor simply and effectively.It is useful for air compressor production department for product performance test and design.

A accurate three-dimensional model of spiral bevel gears for automobile is established according to the cutting principle of duplex helical method.The modal analysis is carried out by using ABAQUS,and the natural frequencies and mode shapes in different orders are obtained.The dynamic characteristic under different loads and speed of the gear pair is simulated by ADAMS.The simulation results show that the natural frequency of the gear pair is so high that it’s difficult to achieve.When the speed of pinion is about 3 800 r/min,the meshing frequency is closed to the first order natural frequency,and the resonance may occur,which should be avoided.Under the same speed,the heavier the load,the smaller the amplitude of vibration acceleration.Under the same load,the higher the speed,the greater the amplitude of vibration acceleration.This study can provide reference for the optimal design of spiral bevel gears.

The product optimization of disassembly sequences contributes to improve the product disassembly efficiency and economic performance.The disassembly process of used products is analyzed and the used parts to be disassembled can be categorized into two types,namely,destructive disassembly and conventional disassembly.Introducing mechanical parts classification into disassembly hybrid graph and further establish an improved model of disassembly hybrid graph.Then,an integrating destructive disassembly and conventional disassembly method is applied to complete disassembly process of used products.A multi-objective function of disassembly sequences for used parts,including disassembly time and cost,is established and aims to minimize the disassembly time and cost.Meanwhile,Particle Swarm Optimization(PSO) is used to multi-objective optimization.Finally,an example is illustrated to verify the feasibility and validity of proposed method.

For large flexible supporting characteristics of wind turbine tower for wind machine nonlinear dynamics of gear transmission system,using the theory of vibration mechanics includes tower stiffness,time-varying mesh stiffness,mesh damping and wind turbines with factors such as backlash nonlinear dynamic model of gear transmission system to solve the nonlinear dynamics research of flexible supporting the vibration characteristics of wind turbine gear system based on 4-5 order variable step kuta long lattice.Based on the current domestic mainstream 1.5 MW wind turbine gear system is analyzed,gaining kinetic characteristics of wind machine in the tower under wind loading,and wind turbine gear transmission system of the secondary parallel shaft helical gear transmission system .Under the effect of wind load,the results show that wind turbine gear under the flexible supporting system vibration is more intense;decrease the value of the wind turbine tower stiffness,wind turbine gear relative torsional vibration response by the period-doubling bifurcation into the mix-up movement.

In the early fault of rolling bearing,the impact component in the signal is seriously disturbed by the noise,it is difficult to extract the periodic feature of the fault signal.Aiming at solving this problem,incipient fault diagnosis method for rolling bearings was proposed based on Local Mean Decomposition(LMD) and Maximum Correlated Kurtosis Deconvolution(MCKD).Firstly of all,the LMD was adopted to collect original fault signals,the Product Function(PF) component of the original signal correlation coefficient is selected to reconstruct the signal.Then,the reconstructed signal is processed by the MCKD,prominenting periodicimpluse component.Finally,the processed signal is analyzed by Hilbert envelope.The fault characteristic frequency can be extracted accurately from the envelope spectrum.Through the simulation and the analysis of the experimental data of inner fault,the effectiviness of the proposed method was berified.

Because the equipment drawings and instructions are too abstract and confused,it is hard for the newly-entered equipment maintenance staff to understand the principle of the equipments in body shop,puts forward a method to solve this problem.Fluidsim software is used in equipment knowledge training for the maintenance staff in body shop.Rich teaching function is contained in FluidSIM software which can be used in elucidating the principle of pneumatic and hydraulic components,and also by using this software can draw the equipment schematic diagram,meanwhile,simulation function module is contained in FluidSIM software which can be used in simulating the operation process of the equipments,maintenance staff can deeply understand the equipments working principle by watching this simulation process.Maintenance staff can personally participate in the design of commonly used electrical control,pneumatic and hydraulic schematic diagram,cultivate their study interest,greatly improve the training effect.

Carbon fiber composite has many excellent properties. It has been widely used in the field of civil and aerospace,but the structural connection strength of carbon fiber reinforced cmposites has been an important factor restricting its development.This summarizes the method of carbon fiber composite bolt connection. The strong theory, strength prediction and influence factors of the bolt connection of carbon fiber composite materials(interference fit,pretightening force,the form of the screw head and the sequence of the stacking sequence) are discussed respectively. Finally, the development trend of carbon fiber composite bolt connections is summarized.