Disassembly energy is the key criteria of product disassembly evaluation,which is of great significance to the product design for disassembly,as well as the recycling decision for remanufacturing.Based on graph theory,the disassembly constraint graph of the hydraulic cylinder was constructed,and the disassembly sequence was generated.The disassembly energy models of the component and parts were developed,as well as the energy consumption models that the parts removed by conveyor belt were defined.The mathematical relationships of the energy consumption to remove the typical connection of the cylinder parts were proposed.An actually existing engineering hydraulic cylinder served as an example for the disassembly energy analysis.This researches are contributed to the disassembly sequence planning and the design of special disassembly equipment for the hydraulic cylinder,and also to its design for disassembly.

A new method for stochastic model updating was proposed to estimate the statistical information of the structural parameters.According to the principle of Bayesian method,the parameters' mean value and variance to be estimated were regarded as random variables and the likelihood functions were constructed by using kernel density estimation method.The posterior distribution of the parameters were calculated by utilizing the population-based MCMC simulation method and then the parameters' mean value and variance could be obtained based on MAP (maximum a posterior) principle.A surrogate model based on Kriging method was established,which greatly saved the computational cost.Numerical example demonstrated the effectiveness of the method.

In order to solve the problem that the change range of insertion force and the contact resistance of brush electric contact were too large and poor controllability because of the stochastic inserting, the structural improvements based on guiding inserting were proposed. Improved structure included single needle cluster coupling, butt coupling guide structure and single needle cluster spiral straightening. Insertion force and contact resistance test with 2 mm insertion depth for the before and after the improvement of the brush electric contact were carried out, and the results showed that the structural improvements of the brush electrical contact based on guiding inserting optimized the insertion force and contact resistance range of the brush electrical contact, the variance values of insertion force test data of the brush electrical contact for the before and after the structural improvements were 0.39 and 0.003, and the variance values of contact resistance test data of the brush electrical contact for the before and after the structural improvements were 0.41 and 0.008. The brush electrical contact based on guiding inserting can improve the design of the structure, improve the performance of brush electrical contact, and can also provide a certain reference on the parameter design of brush electric contact.

Aiming at the defects of conventional Risk Priority Number (RPN) methodology in Failure Mode and Effects Analysis (FMEA),such as discreteness,repeatability,low sensitivity and low accuracy,a new approach based on the economic losses named ERPN was proposed.The proposed approach consisted of two stages:qualitative analysis and quantitative analysis.The first stage aimed at determining the severity of a potential failure situation while the main task of the second stage was to calculate the probability (P) of the initial event and the economic losses (E),then took the product of the two (P and E) as the ERPN value.The new method is direct and objective and has strong maneuverability and good practicability.Besides,reverse fishbone diagram was applied to decompose the structure and the scenario theory was utilized to help analyze the failure situation.Finally,this method was used to deal with the risk priority evaluation of the failure modes of the membrane sending and packing device in the automatic packaging production line,and a satisfactory result was obtained.

In order to realize accurate and objective evaluation of human-machine interface layout, an eye tracking evaluation method of human-machine interface layout based on Vague sets was proposed. First of all, four parameters including track, point of fixation, fixation time, and pupil diameter were taken to build the evaluation index system of human-machine interface layout. Then, on the one hand, the qualitative indexes were transformed into Vague values by uncertain linguistic evaluation form; on the other hand, based on the optimal matrix to obtain the support, oppose and neutral index sets of the layout schemes, the quantitative index would be expressed as Vague values, the Vague set evaluation matrix was built. Finally, the evaluation method based on the distance of Vague values and the optimal and inferior point method were put forward to sort the human-machine interface layout schemes. By taking the human-machine interface layout scheme evaluation of driller console on drilling rig as an example, the practicability and validity of the proposed method was verified.

In order to study the dynamic feature of shearer in the process of cutting and its influence on cutting load, the drum cutting loading was described by the sharp-pick cutting resistance model. The drive load of walking wheel was described by gear mesh model with clearance. The friction load of the smooth shoe was described by Coulomb friction model. The five degree freedom dynamics model of the shearer was established, which was solved by the method of ode45. The result showed that when the hardness of coal rock f=3 and the walking speed was 3 m/min, the vibration amplitude of the shearer's right arm was about 0.8×10^-4 rad , the vibration amplitude of the left arm was about 0.4×10^-5 rad; the vibration amplitude of the body was -1.4~+1.4 mm/s; the angular velocity of the right and left rocker arm was -1×10^-3~+1×10^-3 and -4.5×10^-4~+4.5×10^-4 rad/s. By comparing weather the drum vibration was considered, the result showed that the drum vibration was beneficial to the coal cutting. Through the experimental measurement of the right rocker arm vibration, it was found that the real value and the fluctuation range was basically the same. The result shows that the dynamic model of the shearer has certain accuracy.

The cylinder flow field in the electronic controlled air powered engine which is new developed is studied as the object. Firstly, the geometry model was built and the pre-processing software-ICEM of CFD was used to mesh the model. Then, the dynamic simulation was done by moving-grid technology in the Fluent software. After it was done, the characteristics of the internal flow field were analyzed, then the distribution of velocity field and pressure field about the gas in the process of working were obtained. At the same time, comparisons were made between the numerical simulation calculation and the experimental results in bench of air powered engine. The results showed that the results with numerical simulation of moving-grid were close to experimental results, the dynamic process of the flow field in cylinder of the engine was accurate and reliable, the results of simulation could provide a reference for the design of the engine. When the rotational speed was 450 r/min, the simulative indicated power of air powered engine was 0.62 kW and the experimental indicated power was 0.55 kW under the same conditions, the maximum error of the indicated power between simulative results and experimental results was 11.2%. The effective power of air powered engine was 0.45 kW by the data in the power measuring device, while using homemade dynamometer device, and then acquiring the mechanical efficiency was 81.8%. The research results provide the basis for the further improvement of the air powered engine's performance.

Pneumatic jetting valve plays an indispensable role in the microelectronic packaging.However,the current pneumatic jetting valves can't meet the industrial requirement of droplet consistency completely for the frequent occurrence of jetting omission when it is used to jet high-viscosity adhesives.Jetting capacity must be enhanced to reduce the probability of the problem occurrence.As a key dimension of pneumatic jetting valve,the size of backflow gap influences its jetting capacity directly.In order to improve jetting capacity by optimizing backflow channes,a numerical model of the jetting process was established firstly and its validity was verified by corresponding experiment.Meanwhile,a Gaussian fitting model was built based on simulation data with different backflow channels.After that,the model was utilized to optimize the size of backflow gap by choosing droplet speed as optimization objective.The reliability of optimization results was verified by comparison of the jetting performance before and after optimization.Finally,the optimal size of backflow gap of pneumatic jetting valve was obtained.

The configuration design of fully compliant parallel mechanism can't meet the demand of precision positioning and micro/nano manufacturing. In order to improve the overall stiffness, vibration resistance and interference immunity of the fully compliant parallel mechanism, a 3-RPRR similarly planar fully compliant parallel mechanism which had the same space motion characteristics to the prototype and its branched chains were designed by using type comprehensive method and based on the 3-RPRR prototype parallel mechanism. The optimal configuration of 3-RPRR similarly planar fully compliant parallel mechanism and its branched chains with topology optimization method were obtained. Then two models were respectively established by adopting Hyperworks/Radioss software, statics and modal analysis were carried out. The results showed that the optimized mechanism not only saved material, but also had better overall stiffness, vibration resistance and interference immunity under the premise of achieving the same motion characteristics.

With the wide application of precise radiotherapy techniques in the treatment of tumor,the research of radiotherapy bed is receiving more and more attention.To achieve the aim that the workspace and the dimensions of the structure of the radiotherapy bed can meet the requirement in actual use,the multi target coordinated mechanism parameter optimization method for radiotherapy bed was introduced.In the research,the kinematics analysis of the radiotherapy bed was firstly carried out,the precise analysis of the workspace was taken on the double universal joints parallel radiotherapy bed,combining with the other inverse solution constraints.Then the influence of workspace by changing the rule of geometric parameters was obtained,which could provide the basis for the parameter optimization of the radiotherapy bed.For the problem of improving the strength and rigidity of the Hooke joint,a method of optimizing the initial mounting angle of the Hooke joint was proposed.Considering the workspace,the forces on it and the Jacobian matrix condition number,the objective function of the universe average of condition number and the fluctuation of condition number was constructed at the same time,the specific optimization of radiotherapy bed parameters was carried out.Finally,the parameters of the radiotherapy bed were obtained with the smaller condition number with uniform distribution of the Jacobian matrix in the whole workspace.According to the above,the multi target coordinated parameters optimization method for radiotherapy bed can reduce the Jacobian matrix condition number within limits.With the method,the radiotherapy bed can get the reasonable workspace and structure after the parameters are optimized,and can meet the requirement of actual use.

To study the variation law of screening efficiency of difficult screened moist raw coal particles on the 3-DOF hybrid vibrating screen with two translational and one rotational degree of freedom which was designed independently to research the influence of various vibration parameters, EDEM software was used to simulate the screening process of particles based on DEM. Dynamic screening efficiency and hindering particles excretion rate were used as evaluation indices in simulation screening effect. Then the optimal excitation mode in each combination with all freedom was obtained as well as the effect of vibration direction on moist raw coal particle motion on screen surface. Orthogonal experiment was used in analyzing the effect of various factors on screening efficiency with dynamic screening efficiency as reference value. It was found that the Influence factors were external moisture, vibrational freedom, frequency and amplitude. The optimal screening scheme was used for the simulation experiment and the results verified that multi-dimensional vibration was beneficial to the screening process of difficult screened particles and could prevent jamming the screen holes.

With the rapid development of power industry in our country, the material transportation in the process of the transmission line construction is getting more and more attention. As a new mode of transportation in transmission line, the freight ropeway has been widely used in the transmission line construction with its low cost, convenient construction and not being affected by the climate and other advantages. In the domestic freight ropeway, the fixed rope clips based on bolt is widely adapted, and the action of hanging or offing the cable is always realized by human. So the work efficiency and the economic efficiency are low. The structure of the trolley was optimized, lever reinforcement mechanism was applied to magnify the weight of the bearing body of the trolley which could realize the automatic hanging the cable and could realize the automatic offing the cable based on the weight of the fixed grip body of the trolley. The experiment shows that the optimized trolley can be applied in the complex environment of the workplace, and further reduce the cost.

In gear transmission,unbalance loading makes meshing performance poor and shortens its life.So,the negative influence need to be diminished.In order to minimize fluctuate value of the transmission error,the start angle, the amount of linear tip relief,the slope and crowning of axial were taken as the design variables to optimize the modification parameters of the parallel helical gear pair of vertical mill gearbox by the micro geometric design function of Romax software.Through comparing the transmission error,normal load per unit length,maximum contact stress and the load curve of the tooth pair before and after the modification,the effect of optimization was found out to be remarkable.The gear micro geometric design can remove the deflected load and improve meshing performance,stability of transmission greatly.

Mechanical parameters and the magnetic field distribution of the adjustable speed squirrel-cage asynchronous magnetic coupling are closely related to the ability to transmit electromagnetic torque and the stability and reliability of the entire system. Therefore, it is necessary to study the axial force on working condition deeply. Based on equivalent surface current method, the calculation expression of rotary feeder/exit axial force was obtained through using three-dimensional analysis. By using Magnet (one kind of electromagnetic field analysis software), the value of rotary feeder/exit axial force was solved under the different length of engagement and different slip ratio, and then the comparative analysis was done. The axial force of adjustable speed radial squirrel-cage asynchronous magnetic coupling showed a trend of decrease after the first increase from complete meshing state to out of state. The greater slip, the smaller axial force, and it got stable value when the adjustable speed squirrel-cage asynchronous magnetic coupling was out of state under the condition of the same input speed. The study on the axial force has a certain theoretical significance and practical value in the field of theory, parametric design optimization and application in the research of adjustable speed squirrel-cage asynchronous magnetic coupling and other types of asynchronous magnetic coupling in the future.

With the high accuracy requirement of the guide-localization of the distribute valve,the manufacture of the valve is more difficult when the design of positive opening at the zero position is used in the hydraulic rock drill,and the leakage of the drill is larger,which reduces the working efficiency of the hydraulic rock drill.So a design approach to the negative opening at the zero position and a computing method for the pressure increment of it were put forward to solve this problem on the basis of an analysis and comparison of advantages and disadvantages of the positive opening and negative opening at the zero position respectively.The mathematical model of the valve whose opening was at zero position was therefore established based on the coupling of the accumulator and local resistance.Through the mathematical model,the non-linear equation of the opening motion of the core was obtained.The kinematics of the opening motion at zero position of the valve was simulated in Simulink to analyze and compare the influence of different opening types on the impact property and the pressure of the drill. Compared with the experiment result,the simulation result was verified.The results showed that the design of the negative opening at the zero position of the distribute valve of the hydraulic rock drill optimized the way of guide-localization and reduced the manufacturing difficulties,in addition,the working efficiency of the hydraulic rock drill was increased by 9.2% and the impact energy at a time was increased by 12.5%.Considering the high reliability and efficiency,the design of the negative opening at the zero position is finally selected to be used in the actual working conditions.

In order to improve the sealing reliability of the lead wire from the pressure chamber in the high pressure environment and ensure that the electronic equipment used in the downhole tool can work under atmospheric pressure, a kind of injection class high pressure sealing connector was designed. The sealing connector which filled with rubber and epoxy resin was analyzed based on the finite element software, and the experimental verification was carried out. Analysis and experiment results showed that when the filling material was rubber, the sealing property was good, but the material was easy to be squeezed out, and 88°was a better choice for the semi-cone angle of shell body. When the filling material was epoxy resin, material protrusion could be avoided, but there would be liquid leaking in a certain pressure range. When the filling material was rubber and epoxy resin, evagination distance decreased with increasing of epoxy resin and the use ratio of epoxy resin 40% was a good choice. High pressure sealing connector mainly relied on first five threads to bear load. The maximum stresses appeared at the minor diameter between first thread and second thread of shell body. The maximum stresses of contact pin appeared at the upper border between rubber and epoxy resin. The researching achievement has certain significance for design of high pressure sealing connector and selection of filling material.