The development of market and progress of technology makes the demand matching degree of the derivative products of the product platform reduce and the competitiveness of the products decrease. In order to maintain the advanced nature, the platform needs timely evolution. From two aspects of the platform architecture and platform elements, the DNA and gene of platform were defined, and five kinds of genetic operators including recombinant, variation, replace, delete and add, for the DNA and gene of platform were designed, then the evolution model of product platform based on the five operators was established. By means of adjustment and optimization of platform module and module characteristics, a feasible platform evolution method was formed. Finally, this method is used to guide the evolution of a kind of stamping manipulator, which verifies the feasibility of the theory.

Emotional needs of users are paid more attention by designers and enterprise decision makers. In the development process of new products, aiming to help product development team satisfy consumer's emotional needs which are multi-dimensional and complex, a method combined with entropy, grey relation analysis and TOPSIS was proposed, which could be used to evaluate product design schemes. Firstly, K-mean cluster analysis was used to obtain typical samples and factor analysis was used to get typical imagery of users' emotional cognitive. Then semantic differential was used to gain original consumer-imagery value based on the previous step. Secondly, entropy was used to calculate the weight of evaluation index. Finally, grey relation analysis and TOPSIS were combined to accomplish evaluation and rank of alternative design schemes based on multi-dimensional and specific imagery of consumers. An example of 3D printer design scheme optimization was used to verify the feasibility of the method. Results show that the method can conform complex cognitive of users in fact, so it can evaluate product design schemes objectively and has practical value on application and guiding function.

In order to investigate the dynamic response of goaf group, the method of similar layer shearing model for dynamic response of goaf group was presented. The overburden rock was equivalent to a system composed of the “virtual inter column group” and the lumped mass block, and the surrounding rock was equivalent to shear force Q. The similar layer shearing model of goaf group and the corresponding dynamic differential equations were established to study the displacement and velocity response of rock mass media in the goaf group. Considering the occurrence depth and the shape feature of the element goaf, the influence factor of shear stress δ was introduced to modify the shear stress of surrounding rock. Taking the goaf group formed by 5 gobs in a gold mine as an example, the method was tested by using numerical simulation method. Results indicated that the equivalent method of goaf group environment mentioned above was feasibility; the rock mass got in damped vibration under the double action of the internal damping and the shear force of the surrounding rock; the conclusions of two methods were consistent and the amplitudes were similar, but the former operation time was shorter and the efficiency was higher. The method of similar layer shearing model provides a new way to study the dynamic response of the goaf group.

The differences between the selected similar products and evaluation object will lead to the deviation of the expected results when the reliability prediction is carried out by the traditional similar comparison method. In order to solve this problem, a new method of reliability prediction based on “function-movement-action” structural decomposition was proposed. A “function-movement-meta-action units” hierarchical model was established for reliability prediction with steps by the means of establishing function layer by analysing the product's all functions, establishing movement layer by analysing components' movements that completed corresponding functions of function layer, and establishing meta-units layer by analysing meta-actions that completed corresponding components' movements of movement layer. The interval analytic hierarchy process (AHP) was introduced to determine the weights that reflected the influence degree of offspring motion units to parent motion units. And a mathematical model was constructed to predict parental motion units' reliability from offspring motion units. The factors were determined that affected similarity evaluation process, so as to construct interval comprehensive evaluation cloud model to evaluate similarity between meta-action units and mechanical structures, and the most similar mechanical structures were chosen as referential structures. And the similarity value was used that concluded from interval comprehensive evaluation cloud model to correct the reliability data of referential structures. Then the corrected reliability data were used to predict every meta-action units' reliability of the meta-units layer. The reliability prediction value of the unit of motion was substituted into the mathematical model, so the parental motion units' reliability were predicted from offspring motion units layer by layer, so as to obtain the whole product's reliability prediction value. At last, numerical control rotary table was taken as a case to illustrate the feasibility and accuracy by using the proposed method. The reliability prediction value was obtained and compared with the traditional method. The result shows that this new reliability prediction method has better feasibility and higher accuracy.

In order to study the safe and high-efficiency intelligent charging method for electric vehicle, the improved energy conservation SOC estimation algorithm which considers the effects of the battery capacity attenuation and the internal resistance loss on the SOC estimation is proposed. The improved SOC estimation algorithm was based on the traditional energy conservation method. Then, in order to verify the accuracy and feasibility of estimation algorithms, the above proposed improved SOC estimation algorithm was analyzed and compared with the traditional charging methods. Furthermore, according to the optimal charging current with Maas Theorem, the three-stage intelligent charging method (small current charging, pulse charging and constant voltage charging) was proposed based on the improved energy conservation SOC estimation algorithm,and the three-stage intelligent charging simulation model based on the improved energy conservation SOC estimation algorithm was established. The simulation results showed that the SOC value obtained by the improved energy conservation SOC estimation algorithm was smaller than the value obtained by the traditional energy conservation method. And the SOC value obtained by the improved energy conservation SOC estimation algorithm was more close to the real SOC value. Moreover, the three-stage intelligent charging method based on the improved energy conservation SOC estimation algorithm can intelligently select the detailed charging method according to the SOC variation, which could realize the fast and safe charging for electric vehicle. The proposed three-stage intelligent charging method can provide reference for current charging method study for electric vehicle. And the improved SOC estimation algorithm can also provide one feasible method to enhance the effectiveness of the intelligent charging method for electric vehicle. In addition, three-stage intelligent charging method can lay the foundation for application of the intelligent charging theory to engineering practice.

Aiming at the unlocking reliability of the ball locking mechanism for separating electrical connector, the mechanical model for the mechanism unlocking process is established by the analysis of the unlocking principle. The unlocking resistance of the critical point of the mechanism was obtained, and the self-locking conditions for the mechanism were acquired by analyzing the self-locking situation of the locking ball. Based on the analysis of the distribution of various parameters affecting the unlocking resistance for the mechanism, the probability distribution of the locking resistance and the self-locking angle were attained by Monte Carlo method, then the two distributions were tested. The means and variances of the two distributions were calculated by maximum likelihood estimation method. Finally, according to the allowable range of mechanical unlocking force, the unlocking reliability at the critical point and the reliability of non-self-locking were obtained respectively, and the unlocking reliability for the mechanism was evaluated by series reliability model. The results show that the proposed method is effective for the analysis of the ball locking mechanism unlocking reliability and it provides a reference criterion for the mechanism reliability design.

Many of the productive and daily activities of people are done in the sitting position, so it is important to study posture comfort. As sitting comfort in the seat design plays a more and more important role, the studies of the seat comfort gradually transform into the evaluation of sitting comfort. In order to achieve the demand of the human body comfortable sitting posture,the design of humanized seat must ensure that its comfort level as high as possible. With the purpose of improving the seat comfort which provided to the body, there had been much previous research on measurements of comfort and discomfort in sitting,sitting posture features extraction analysis was an important issue in the product design. In view of the sitting comfort evaluation,the method which integrated classical optical motion capture technology and new investigation methods in real environment. In the experiments, Motion Analysis Eagle Digital System was used to capture the body motion of 40 participants, and obtained the human body each joint point in the space. During the 11 Eagle cameras setup was completed, a self developed MATLAB program to analysis and calculate the data captured was used. Some particular features were obtained by principal component analysis (PCA). Moreover, the distinct difference between ergo chair and standard chair on the joint angle and the torque was obtained. After checking all the angles' and torques' appearance, based on the theory of ergonomics, the angles of the trunk, thighs, knees were identified as important features for sitting posture recognition. It provides a theoretical basis for seat design. The results showed that this digital evaluation of sitting posture method integrates Chair Study Questionnaire, which provides an effective method to evaluate the comfort of the seat.

Ultrasonic resonant system is the core equipment of rotary ultrasonic machining (RUM), and multi annular plate structure is a typical load structure of ultrasonic resonant system. The analysis of transverse flexure coupled vibration for this structure is of great significance for ultrasonic resonant system design. Based on Mindlin theory for thick plate, transverse flexure vibration analysis model of multi annular plate was established by the use of deflection, rotation angle, shear force, and bending moment of continuity and boundary conditions for annular plates. Frequency equation was derived, and calculating software for transverse flexure coupled vibration frequency of multi annular plate was designed by MATLAB. By the comparison among theoretical model, finite element model analysis and model experiment, the accuracy of the solving model and practicability of the calculating software were verified, which provided technical reference for RUM system design.

Multi-motor driving plays a crucial role in the way of high-speed, long-distance and large-capacity for conveying equipment. Because of the advantages of no friction, no rotating drive components, arbitrary arrangement along the conveyor length direction and the reduction of the characteristics of belt tension, the linear motor becomes an ideal middle drive form in the high performance special belt conveyor. The merits and demerits of linear motor were compared with rotary motor based on its fundamental principle. The type of secondary structure was determined by comparative analysis for linear motor used in belt conveyor. And the secondary structure of belt was designed. According to the closed bulk handing material testing system, the test rig of static and dynamic characteristics were established. The thrust (tension difference of belt) of the linear motor was obtained using the Euler formula and the point by point tension method. Meanwhile, the proportional relationship between voltage and thrust was verified by experimental as well as air-gap and thrust. And the dynamic test (mechanical properties test) was carried out indirectly. Then the mathematical relationship between the thrust and belt speed was obtained. Moreover, the pulling force of stable running and starting process of belt were simulated based on Belt Analyst software and they also were compared with the experimental results. The experimental results showed that the thrust was proportional to the square of the voltage and the square of the reciprocal of air-gap respectively. It was also concluded that the theoretical curve between voltage and thrust (as well as air-gap and thrust) was consistent with experiment value. The ratio of thrust and input power on the linear motor was large, and the smaller the air-gap, the greater the ratio. In addition, compared with rotary motor, the linear motor had no critical speed, and it represented very soft for its mechanical properties. Ultimately, the simulation value of pulling force of stable running was basically consistent with the test value and all relative error within 2%. But the error was larger in starting-up process, which indirectly indicated the importance of ensuring the uniform of air-gap. This work can be applicable to the practical application and improvements for multi-motor coordination driving the ultra-long distance belt conveyor.

To study the output force characteristics of proportional solenoid under the strong vibration, the dynamic mathematical model and simulation model were established by using the electromagnetic field theory and forced vibration theory. The gap reluctance, motional electromotive force and the output force under different vibration parameters were studied by simulations, and the influence principle of strong vibration on the output force was discussed. Meanwhile, the output force fluctuation caused by the change of armature quality, damping coefficient and spring sitffness was analyzed under the strong vibration. Results indicated that the amplitude and frequency of vibration and motional electromotive force fluctuation amplitude were positive related, the output force fluctuation amplitude and gap reluctance were linear positive with vibration amplitude. The output force fluctuation amplitude decreased approximately linearly with the increase of the damping coefficient under the strong vibration. When the spring stiffness was smaller than 20 000 N/m, the output force fluctuation amplitude decreased rapidly with the increased of the spring stiffness. The results can provide the theoretical reference for improving the performance of the proportional components under the vibration environment.

Cutterhead system is the core component of TBM (tunnel boring machine) equipment, which works in extremely poor conditions. Due to the excessive vibration, the abnormal failure of key components will occur and it can influence the whole machine efficiency. Hence, it is necessary to study the dynamic characteristics of the TBM cutterhead system and analyze the influence of different parameters on vibration response, which can provide a theoretical basis for the system design and parameter matching. Based on the dynamics model of TBM cutterhead system, a TBM cutterhead system of a diversion project was taken as an application instance, the parameter influence laws of cutterhead vibration response under spatial multi-point distributed loads were analyzed. The results showed that the cutterhead vibration was the smallest when the mass ratio of cutterhead piece was controlled in the range of 13%-14%. Moreover, the cutterhead radial and torsional vibration fluctuations were relatively obvious when the rotate speed was higher than 2 r/min, and a series of peak mutation speed points were obtained. Furthermore, when the driving pinions were arranged in a uniform distribution, the cutterhead radial vibration was the smallest, and the vibration amplitude was smaller nearly 30% than that of the non-uniform arrangement. The analysis results can guide the structural design of cutterhead and system parameters matching.

A Gripper and Thrust hydraulic system with the function of Load-Sensing, Constant Pressure control and auxiliary support of accumulator (LSCPGT) was proposed to overcome the problem of high relief loss in the hard rock Tunnel Boring Machine (TBM) gripper and thrust system after gripper reached a preset pressure. Model of LSCPGT system was established by AMESim. The pressure and flow responses of LSCPGT system were analyzed, and the pressure and flow responses of Constant Pressure Gripper (CPG) system were compared with that in gripper system, and the pressure and flow responses of Load-Sensing Thrust (LST) system and Ration Thrust (RT) system were compared with that in thrust system. The results indicated that LST system and LSCPGT system had no flow loss during the thrust process. In gripper system, the CPG system had certain flow loss under the support condition, but the LSCPGT system had no flow loss with the help of accumulator. Moreover, compared with the gripper and thrust system composed of LST system and CPG system, LSCPGT system improved at least 43.5% in efficiency after gripper reached preset pressure. The designed LSCPGT system which meets the demand of gripper and thrust can save energy through avoiding flow loss.

Taking the “Hero” shield machine working in a certain section of Nanchang Metro Line 1 station as the research object, aiming at the problem that conventional PID cannot guarantee the precision of propulsion cylinder synchronous control, the strategy of single neuron PID control was put forward. The physical model of hydraulic propulsion system was established by AMESim, and the single neuron controller was designed by Simulink. Finally, the synchronous control performance of the propulsion cylinder under the condition of different sudden change loads was analyzed by joint simulation. The simulation results showed that compared with conventional PID, the regulating time of the proposed control strategy was shortened about 0.1 s, and the oscillation amplitude was reduced to the original 1/2. From the analysis of results, single neuron PID control can effectively solve the problem of propulsion cylinder synchronous control, which provides an effective theoretical support for the synchronous control of shield propulsion system under adverse geological environment.

Developing the intelligent stereo parking lot is an important way to solve the parking problem in cities. According to the movement characteristics of the intelligent stereo parking lot, the speed regulating hydraulic control system of walking, turning and lifting was designed, which could accurately control the speed and position of the stereo parking lot. The speed regulating system was the most important system of the stereo parking lot, so the mathematical model was established. Firstly, the dynamic characteristics of the speed adjustment system were simulated and analyzed by MATLAB/Simulink. Secondly, the experimental prototype was tested and verified. The results show that the circuit design of hydraulic system is reasonable and can meet the accurate control requirement which provides theoretical basis and reference value for further study on the hydraulic control system of intelligent stereo parking lot.

Aimed at the problems of low reliability and maintenance difficulties in the traditional warp knitting machine electronic jacquard control system with complex multi-card structure, a novel embedded electronic jacquard guide bar (EEJGB) characterized by highly integrated is designed. Based on EEJGB, a hybrid isomerism serial communication system was designed. Such system ensured real-time communication as well as reliability and fault tolerance of communication system, which was investigated using real-time analysis. Meanwhile, a new dynamic configuration method of EEJGB addresses was proposed.To prove the effectiveness and feasibility of the proposed communication scheme, a case of Modbus based on communication scheme was provided in detail. The analysis shows that the proposed hybrid isomerism communication architecture with high real-time performance can ensure the reliable delivery of pattern files and fault location, rapid maintenance and distributed expansion of EEJGB, which can offer some useful reference for the design of the new generation of integrated electronic jacquard control system.

A magneto-rheological (MR) damper with multistage serpentine magnetic circuit is designed to improve damping performance. Magnetically conductive and non-conductive elements were stacked to weave the magnetic flux path, and it was forced to pass through the flow channel of MR damper several times, which could improve the efficiency of flow channel. The mathematical model of the designed MR damper considering the nonlinear flow effect of the MR fluid in the flow channel was established, and the finite element analysis (FEA) was utilized to predict the damping characteristics of the designed MR damper. The damping performance of the designed MR damper was also theoretically compared with that of a traditional MR damper with the same outer dimensions (radius, length) of piston by the performance matrix, such as the damping force, equivalent damping, and dynamic range. Results showed the designed MR damper could provide a large controllable damping force as high as 11 000 N under excitation velocity of 0.125 m/s for current of 2.0 A, which was about 2.3 times over that of traditional MR damper. What's more, the damping force of the designed MR damper was equal to that of traditional MR damper in no current case, for the structural form and dimensions of flow channel of the designed MR damper and the traditional MR damper were same. The designed MR damper has excellent damping performance and is suitable for a wide range of engineering applications of vibration suppression.

In order to prevent the shoulder of the packer rubber tube from bursting and improve sealing ability of packer under the working condition of large clearance and high pressure difference, a kind of umbrella complete anti-extrusion device is designed against the weakness of traditional anti-extrusion device. Packer rubbers without anti-extrusion device, with partial anti-extrusion device and with complete anti-extrusion device were analyzed by using the finite element software. Sealing performances were compared under the condition of large clearance. Analysis results showed the maximum Von Mises stress of packer rubber with complete anti-extrusion device was the minimum and the sealing ability was best. Then, the structure and working principle of umbrella complete anti-extrusion device were introduced and its mechanism was analyzed. At the same time, an umbrella complete anti-extrusion device which was suitable for the Y111-150 packer was designed. Whether the mechanism was self-locking and whether the parts interfere with each other were verified. When the flap of anti-extrusion device opening,the pins at the both end of the connecting rod were likely to lose efficacy with maximum stress. The diameter of pins and the connecting thickness of rod were necessary to fortify when the anti-extrusion device in the high pressure difference and large clearance condition. The research achievement has a certain significance for design of anti-extrusion device.