Design around process from the technology of core patents which could avoid patent barriers from the source was proposed. The target patent data was obtained by patent research，then the group of core patents was determined using citation analysis for the patent. The scope of patent design around was determined by establishing the system structure trees and function trees and building module-function table. Components and their functions were analyzed to determine function type and functional level of component, then a new program was obtained via TRIZ and infringement. Finally, automobile engine piston pin press pin device was used as an example to verify the feasibility of the process.

In order to increase the access efficiency and the service capacity of a stereoscopic warehouse in the condition of higher space utilization, a new model of multilayers stereoscopic shelf was put forward, that was Multilayers Chessboard Based (MCB) stereoscopic shelf. This new concept was put forward by comparing the structures of those stereoscopic shelves mostly being used now and analyzing their own handling modes. In the two-dimensional perspective, the arrangement method of MCB stereoscopic shelf just liked the problem of putting chess pieces on a rectangular chessboard. In order to realize the arrangement of MCB stereoscopic shelf, problems were described and analyzed, mathematic models were established, algorithm was designed, and the algorithm called CPA (chess pieces algorithm) was structured in the aim of single multispecies goods being accessed randomly. Finally, experiments were made, and the result showed that CPA could settle the problem of realizing the arrangement method of MCB stereoscopic shelf reasonably and efficiently. MCB stereoscopic shelf could make the space utilization of stereoscopic warehouse in which single multispecies goods could be accessed randomly higher than 75%, and also lay the foundation for higher access efficiency.

In order to improve the cutting performance of the roadheader further and reduce the wear of picks, the Theory of the Solution of Inventive Problem (TRIZ) was studied. By using the conflict concept, the conflict resolution principles and problem solving method in TRIZ, questions were analyzed, mainly focused on how to optimize the arrangement of picks of cutting-head, how to improve the efficiency of cutting, how to improve the force of picks and how to reduce the wear of picks. And under the inspiration of the 15th inventive principle (dynamic character principle), the specific solution which was using the arrangement of variable angel spiral of picks was obtained. According to this idea and combined with regular design method of cutting-head, three cutting-heads whose picks were arranged in different kinds of variable angel spiral were developed. The energy consumption of cutting-ratio along with the original cutting-head were tested and the experiment showed that the cutting-head of J23 type performs efficiently and stably. It could be finalized and produced after some little improvement.

The flexibility robustness of compliant mechanism is the premise of compliant mechanism widely applying in miniature electromechanical systems and precise engineering field. In practice, this problem cannot be solved by using traditional method. A new robust design method was presented, the structural parameters of flexure hinge and working load were selected as well. By processing and analyzing test data resulted from orthogonal test, the best combination of parameters was obtained and verified by experiment. The results demonstrated that, against the traditional design, the signal noise ratio increased about 4.68 dB, the quantity loss of flexible hinge reduced. It also implemented the flexibility stability optimization on the flexible hinge. Finally, the flexibility robustness of flexible hinge could be optimized. The robust design can be widely used and has reference value in application.

In order to solve the complex nonlinear problems of convergence difficulties and severe concussions on cutting soil simulation for EPB cutter, a cutting finite element model was established based on the large-scale nonlinear finite element software and solved by using CEL method. The cutting force was about 80N when using CEL method, while the force was about 50N using the method of EF and ALE. So the result obtained via CEL method was closer to the theoretical result which was 78N and the result was less shocked also. Finally, it was also found that CEL had lower sensitivity to the grid size than EF and ALE by studying the influence of the finite element mesh size on the simulation results, which might contribute to improving the cutting efficiency. In summary, the proposed method is more suitable for the practical engineering situation.

The supporting in advance equipment is used to support the roadway head-on roof temporarily. In order to improve the stability and optimize the structure of the supporting in advance equipment, the modals under different conditions were studied. Under the circumstance of ensuring the mechanical characteristics of the supporting in advance equipment, multi degree of freedom dynamic model of the equipment was established, the differential equations of motion was deduced, and the numerical solutions were found out to get the vertical frequency response under specific incentive. 3D modeling software Pro/E was used to establish a simplified solid model and imported into the analysis software ANSYS to analyze modal under the full support condition and single group support condition respectively. The low order natural frequency and main vibration type of the supporting in advance were obtained that provided a reference for the analysis of dynamic characteristics. The Polymax modal identification method was used to test the experimental prototype model under the full support condition and single group support condition. The test data was compared with the simulation results, the dynamic characteristics and natural frequency of it were analyzed, and the theory basis for the design and development of similar support protecting equipment were provided.

In order to improve the shearer stress state, optimize the support method of guiding sliding boots, reduce the failure rate of traction mechanism and enhance the safety and reliability of shearer, a shearer hydraulic adjustable posture traction mechanism against the traditional traction mechanism characteristics was presented. The main structural parameter calculation method was obtained and the mechanical model of hydraulic adjustable posture traction mechanism was established. The adjustment range of shearer fuselage was determined at 0-30 mm and the transmission case shell angular range was determined at 0-10°. And the impacts of the change of tractive on the main design parameters of hydraulic adjustable posture traction mechanism were analyzed. The result showed that due to the change of tractive and the compressibility of hydraulic oil, the maximum value of the angular range of transmission case shell was 0.178° and 0.0754° when support points in the highest (θ=0°) and the lowest position (θ=10°) respectively, and the measure of the change point height was 0.009 5 mm and 0.447 mm. The research indicated that the impacts of the change of tractive and the compressibility of hydraulic oil on shearer posture were small. The study provides the basis for the subsequent research of the shearer hydraulic adjustable posture traction mechanism.

To solve the problem of whether the high temperature electrical connector could keep the contacts contacting-reliable within the specified time under high temperature environment, the 3D simulation model was created.  Using finite element analysis software analyzed the connector's transient thermal performance of pin and socket contact parts under different temperature stages. Using the electromagnetic heating device to tested and verified the accuracy of the result of finite element. On the basis of this, considering the randomness of the parameters' performance, six Sigma standard and Latin hypercube sampling method were used to get that the contact temperature obeyed normal distribution. Based on the test of contact parts' insertion force in different temperature, the relationship between the stable value of contact part insertion force and the temperature, and the threshold temperature which met the need of work requirement were got. Finally, the high temperature electrical connector's contact reliability was calculated.

Structural layout design exists some problems, such as complexity of variable types and existence of variables coupling. It is of important engineering significance to design the lightest structure, which meets the specific constraints. Based on the concurrent subspace optimization method in multidisciplinary design optimization，a structural concurrent subspace optimization method was developed for the layout design of trusses. In terms of the type of variables, the design problem of structures was decomposed into three concurrent subspaces as layout, shape and size. And the optimization in each subspace was carried out separately to avoid the coupling of design variables. By remaining the design variables in the lightest subspace unchanged and altering two other types of variables with approximate one-dimensional search algorithm, the coordination was achieved in system level to ensure the convergence of the analysis problem. Then next iterate was executed until termination. Two examples were solved successfully to demonstrate practical engineering value of the proposed method.

Aiming at the vulnerability of traditional mathematical programming theory on multi-objective optimization in practical engineering optimization problem and some of the existing defective of multi-objective optimization methods in application, an improved particle swarm optimization combined with grey decision to make multi-objective optimization was put forward. A multi-objective optimization software was developed which was convenient for engineering application by using MATLAB and VB based on the above multi-objective optimization method. The software was applied to do multi-objective parameter optimization on roadheader shovel plate. By doing so, it verifies the feasibility of this method and provides convenience and reference to deal with multi-objective optimization problems in engineering practice.

The monad auxiliary equation method is presented to model the polynomial systems for kinematic synthesis of linkages. The kinematic synthesis equations of mechanisms originally derived from the closed vector loop， which contained the independent angular unknowns， were transformed skillfully to the polynomial systems by adding the component variables of monad vector and auxiliary equations， and then the total degrees and mixed volumes （or BKK bounds） of the systems were dramatically decreased. If the x and y components of the monads were yielded from the linear equations constructing by monad vectors in a closed vector loop and substituted into the corresponding auxiliary equations， the polynomial systems for dyad or triad were derived. The method was applied to the problems of motion， function and path synthesis for guide-bar linkages and their three forms of synthesis systems grouped were developed. The process to construct the synthesis systems and analyses of their total degrees and mixed volumes showed that the total degrees of the equations constructed by the method were really close to those of equations grouped by dyad and triad vectors， but the formulae of the former were derived much conveniently and the modularity about monad‘s formulae and structures was also better than the latter. Hence，the monad method may be theoretically adapted to automated modeling and solving the synthesis equations for any linkages in a computer．

TBM (tunnel boring machine) will be affected by strong external vibrations when it is working. In order to study the influence characteristic of the strong vibrations to the thrust hydraulic system, firstly the principle of the TBM thrust hydraulic system was summarized, then the AMESim model for the thrust hydraulic system under fundamental vibration was established, the correctness of the simulation model was experimentally verified, and finally the speed fluctuations and frequency domain influenced by external vibration frequency and the vibration amplitude were studied. Results showed that, hydraulic cylinder pushing speed was influenced by external vibration, the impact became the biggest when the external vibration frequency was 40-60 Hz; the influence of the change of the vibration amplitude was lower than the change of the vibration frequency; the cutoff frequency of the thrust hydraulic system was about 13 Hz. When the outside vibration frequency was higher than it, the frequency characteristic of hydraulic system would become worse, and the hydraulic cylinder was difficult to make the appropriate response to the input signals.

Reflux hole helps self-priming pumps to improve self-priming performance when the reflux liquid flows into volute. Its position and area have a great influence on the self-priming capability and efficiency of the pump. The internal flow field of the self-priming pump was numerically simulated with the CFD method， to study the flow characteristics nearby the reflux hole and analyze the impact of the position and area of the reflux hole on the internal flow as well as the pump performance. The simulation results showed that the tendencies of simulation results matched with the experimental data. When the pump was operated at its design point， the reflux flow rate increased with the area of the reflux hole and consequently the self-priming capability was improved without suppressing the pump performance. When the flow rate was larger than the nominal flow rate， the increase of the area of the reflux hole leaded to the leakage that flowed from the volute to liquid storage chamber， which caused greater volume loss. The position of reflux hole had influence on the pressure difference between the inside and outsider of the volute. The position of reflux hole was closer to the tongue， the pressure difference between the volute and the liquid separating chamber was bigger. And the leakage flowed from the volute into liquid storage through reflux hole was larger， which reduced the efficiency of the pump. So there is an optimal area and position of reflux hole for a specific self-priming pump．

In order to solve the current problem which is the lack of insertion-extraction force control method for brush electrical contact, the method based on the insertion depth was put forward. The structural mechanics model and the finite element model in the insertion-extraction process of the brush electrical contact were constructed, and the insertion force test on the brush electrical contact was done. The comparative analyses of curves of the insertion-extraction force varying with the insertion depth of the structural mechanics analysis model, the finite element model and test data were performed. The influences of random inserting and other factors on the structural mechanics model were assessed, the insertion-extraction force in different insertion depth of the brush electrical contact and the spring wire socket electrical contact and twist-pin electrical contact were carried out. The results showed that the insertion force of brush electrical contact and the insertion depth followed the power function relationship. When the insertion depth was in the range of 1.8-2.4 mm, the typical brush electrical contact insertion-extraction force was significantly smaller than the same specifications spring wire socket and twist-pin electrical contact. The method of controlling insertion-extraction force based on the insertion depth can provide a certain reference on the series expansion and parameter design of brush electric contact.

To solve the parking trajectory error caused by time-delay in voice-assisted semi-automatic parking system, a kinematics model of auxiliary parking was established. And also parking planning methods and control strategies based on horizontal parking spaces were proposed. Using the 3-order polynomial fitting to deduce the piecewise approximation function of parking trajectory which took the lateral distance D between the vehicle and the target parking space as the variable, the impact of time-delay on actual trajectory in voice-assisted semi-automatic parking system was simulated and analyzed. Parking trajectories were independent variables, and the horizontal and vertical deviation of parking trajectory were evaluation indices. Relations between each trajectory deviation and the final parking position deviation were derived. Through simulation, tolerance analysis for parking path deviation was conducted. The parking dynamical adjustment strategy was proposed based on the method of table look-up, and also it was achieved through software programming. Finally, group tests from 4 drivers verified the validity of parking dynamical adjustment strategy.