In order to realize inheritance, management, sharing and reuse of existing knowledge, reduce the design difficulty of electronic warfare system in the conceptual design phase, and shorten development time in the design process, problems like the complexity of concept design and the variety of knowledge involved in the process were directed. The widely used digital receiver was researched. Combining the knowledge engineering theory, a structured and standard knowledge model of EW system was established which were used as an criterion to explain the modeling method and standard. Through managing all the knowledge model using the knowledge system, the inheritance, management and sharing of existing knowledge were realized. In this way, with the support of knowledge model, the knowledge system could provide various design schemes and verify itself by reusing the knowledge model and realize the reuse of existing knowledge. Finally, the goal of supporting the EW system concept design with existing knowledge achieved.

The styling design of auto-body requires a design scheme of its free form headlamp quickly that is satisfied with illumination and lighting requirements. According to the principle of case-based reasoning （CBR） methodology, this paper firstly studied the object-oriented case representation models for the free form headlamp. Then, a headlamp case index model and matching algorithms were established according to the nearest neighborhood method of case retrieval and applying some preprocessing tools, such as the headlamp bounding box and the layout reference frame. By representing the design knowledge and constraints of free form headlamp, this paper built an appropriate case matching algorithms to obtain a design scheme for free form headlamp and presented case adaptation strategies, combining dimension-driven with constrain satisfaction, to modify case solution fitting with the current problem definition. The application example showed the feasibility and practicability of the present methods on solving the conflict between engineering requirements and styling design. As a result, these methods may introduce design requirements into the conceptual design stage of free form headlamp and quickly achieve appropriate design scheme.

In the light of the situation that former kansei engineering(KE) model tends to be one-dimensional variables in expression which causes low practical value, this paper proposes to construct KE model with multi-dimensional variables in expression. Guided by cognition and morphology theory, a product deconstruction method was proposed to obtain multi-dimensional design elements. Taking morphological characteristics as a breakthrough point instead of product parts as extraction principle, the feature deconstruction framework was proposed which induced by appearance, operation and cultural symbol three levels. A morphological characteristics procedure of deconstruction was analyzed, to validate the performance of the KE model, by taking air cleaner as an example.

In order to study properties and characteristics of random loading on a mining backhoe loader-bucket during scooping granular coal and rock, the load on bucket was regarded as the resistance superposition of tangential, normal and lateral through reasonable assumptions and simplification. Normal resistance model of bucket was established by using Weibull distribution and deterministic analysis. Lateral resistance model was established by using the two-parameter method. Tangential resistance model was established by using joint distribution and random signal method. Taking a domestic underground mining loader as the research object, random loads of bucket were obtained by using MATLAB when the bucket cut in granular coal and rock, and the characteristics of random loads were analyzed. The results showed that the loads were obviously random and volatile, and the position of cutting angle of each resistance was different when they reached the maximum resistance. As the loader excavating arm working forward, the normal resistance reached its maximum value of 5.7×10⁶ N when the cutting angle was 2.5628° but the lateral resistance had no obvious rule. The tangential resistance reached its maximum value of 2.8×10⁶ N when the cutting angle was 39.950°. The maximum of normal resistance was 2 times the maximum of tangential resistance. The cutting load reached its maximum value of 5.9×10⁶ N when cutting angle was 22.628°. The study provides a method of determining loads of the mining backhoe loader-bucket and lays the foundation for analyzing its working conditions.

In order to improve the global search capability, a distant neighborhood PSO was presented. In the algorithm, each particle had its own neighborhood by selecting particles far away from it in Euclidean distance. Neighborhood operator was adopted to control the number of particles in its neighborhood. Experimental results of benchmark functions indicated that the algorithm eliminated the standard PSO's weakness of easily converging to local optimal value. The distant neighborhood PSO was applied to optimization design of Delta robot. It turns out that the distant neighborhood PSO has better search capability than the standard PSO and higher search precision than neighbors increasing PSO.

In order to manage the poor capability to carry cuttings of the traditional reverse circulation down-the-hole (DTH) bit, a new bit is designed. The distance, size and number of the bit-cylindrical teeth were optimized in the designed bit. Also a new logarithmic-spiral arrangement form for the bit-cylindrical teeth was proposed. Then, the flow’s situation at the bottom of a traditional and optimized bit was simulated using the commercial fluent software respectively. Finally, the validity of the simulation model was validated by experiment, which indicated that, compared to the traditional bit, the air velocity near the optimized one was changed from 16.5 m/s to 19.25 m/s, and the air velocity of the latter became more uniform. Namely, the ability of the optimized bit was stronger and more stable to carry cuttings. The proposed optimized bit can meet the demand of practical engineering better.

Some thin sheet parts have limitation on their exposing time. It is usually hard to meet their freshness requirements when sorting by traditional vibrating plate. Even human operation or multi-freedom manipulators cannot solve the problems completely. Based on the analysis of the screening theory, an automatic sorting vibrating screen with inclined baseboard was established. It could satisfy the sorting requirements of a kind of medical testing strips and dry filmss with only little parts not being flat stacked in the screen. The screen was developed by designing a special cover structure with a funnel-shaped hole cover on it. By reciprocating vibration, the final screen-penetrating probability was more than 99%. And compared with the uncovered structure, it could satisfy the sorting and efficiency requirements completely under the condition of increasing the reciprocating vibrating times by 7%. As a result of fact, the new vibrating screen can be widely used for the sorting of time-limited thin sheet parts.

Facing the fact that many products have redundant structures and complex workflows currently, an innovation design strategy which integrates the ideal result and system trimming method is presented. The strategy took advantage of the system demands analysis to determine the ideal result, then found out the system problem under the guidance of the ideal result. The function analysis of system components was used to determine the problems caused by defective components of the system, which were eliminated by using the system trimming method and got the ideal result.  This strategy was applied in the existing surface oil cleaner for improved design which significantly simplified the existing surface oil cleaner working processes and improved their working efficiency and environmental compatibility.

In order to solve the application bottlenecks of sunlight conveyer caused by high-cost of optical fiber and large energy loss on light transmission in the tunnel enhanced illuminating systems, a new sunlight conveyer with polar coordinate tracking has been put forward. Under the circumstances of eliminating the transmission medium such as optical fiber in this engineering, the working principle that using the direct conversion of light to light and optical path’s tracking adjustment to meet the illuminating requirements was analyzed, and the automatic tracking device with polar coordinate type was designed. Moreover, it was also equipped with the double tracking control system so that the concentrator was drove to gather the sunlight in real time, then the optical path of concentrated sunlight was adjusted by the light guiding mechanism. The experimental study showed that the sunlight conveyer had realized the function of tracking the sun automatically with high precision and outputting enhanced parallel sunlight with fixed direction. The sunlight is used in adaptive directed-illuminating of tunnel’s transition section which has been effectively achieved.

For doing experiment research of special shipspropulsion system’s vibration characteristics when ship hull was deformed by complex sea wave, a kind of simulative experiment system based on hovercraft was presented. The experiment system consisted of flexible buoyancy tank, elastic bears, variable frequency motor, fans, air propeller, shafting and controlled system. For simulating the effects of flexible ship hull’s deformation caused by wave, excitation’s control components, control circuit and control strategies were introduced particularly. Using the experiment system, three kinds of hog deformations of base were tested, which were 10, 20 and 30 mm respectively. Testing results showed that the experiment system could control elastic bears’ heights collaboratively with good control precision of heights, and could imitate influence of sea wave to ship hull. Study results prove that the experiment system is a effective experimental platform for special ship with small hull stiffness.

General airborne data recording system is currently designed with fixed channel number and fixed storage capacity which is inflexible to adapt the changes on the measured object. Arming at the changeable requirement on the measured object， the modular and flexible design methods were adopted. The slot type data recording system was built treating the substrate as central logic control modular， which realized the flexible extension for interface and storage module and improved the flexibility and versatility of the record system. The key modules of data recording system were verified by testing and analyzing. Through extensive field trials， recording system verification and reliability could be achieved. Modular and flexible design method ideas possess with high feasibility， worth of spreading to the vehicles， ships， and other areas of data recording．

To solve the size limitation problem of the frequency selective surface in engineering application, a novel miniaturized frequency selective surface (FSS) was proposed. The miniaturized size was achieved by increasing the values of equivalent inductance and capacitance of the unit cell. Compared to previous miniaturized structures, the proposed FSS had better miniaturization performance with a unit cell of only dimensioned as 0.079λ₀×0.079λ₀, where  λ₀ represented the wavelength of the resonant frequency. The high stability of the FSS was gained by a high degree of symmetry of the new structure. The simulation and measurement results showed that this structure kept the excellent transmission stability with respect to different incidence angles and modes of plane wave.

Revealing the mechanism of performance degradation and assessing the degradation degree of a combined rotor， one of the main parts in engine， are important to maintain the engine for long-term safety operation. Performance degradation characteristics of combined rotor were discussed， from the perspective view of performance degradation caused by rod crack. Finite element model， bending stiffness model and torsion stiffness model of the combined rotor were established. The crack extension rate of the rod was gotten by using the finite element model. Also， the influence of different depth of crack to the vibration on combined rotor was analyzed using the bending and torsion stiffness model to obtain the relations between natural frequency and crack size. Then， the measurement of performance degradation which was caused by micro cracks was put forward， and the assessment of performance degradation was completed as well. The results showed that the micro crack extension rate got faster when the size of crack increased and the rod crack made much effect on the bending vibration of the combined rotor comparing with the torsional vibration．

The compliance performance of arc flexure spherical hinges was studied which can replace traditional biaxial flexure hinges and be used in compliant mechanisms with multi-DOF. Based on Castigliano's second theorem，compliance equations of the arc flexure spherical hinge were formulated. Analytic formulas of the arc flexure spherical hinge were verified by ANSYS12.0 analysis. The research results showed that the finite element analysis and theoretical calculation were basically the same. After analyzing the performance of arc flexure spherical hinge by changing structural parameters， the influence order to its compliance was obtained. The greatest impact parameter was the minimum diameter t， followed by the arc central angle θ_m， the arc radius R and the Young’s modulus E. This method provides a valuable reference for the design and application of the flexure spherical hinge．

Different surface rough features are achieved by different machining methods. In order to probe the influence at rough texture of tooth surface on gearing lubrication effect， 45 groups of numerical calculations were carried based on the roughness data measured by a roughness profile measuring analyzer. The computing results showed that, the effects of roughness on both the oil film thickness and the contact stresses were insignificant when the root mean square roughness of tooth surface  σ≤0.15 μm but the contact stress for rough teeth surfaces was almost linearly increased with an increment of the value of the σ and the contact stress between teeth surfaces with longitudinal rough features was always greater than the one between teeth surfaces with transverse rough features when σ>0.15 μm. Especially， when σ≥0.55 μm， oil film thickness was decreased by 40% and the contact stress was increased by 90% for longitudinal rough features while both the film thickness and the contact stress for transverse rough features were increased by 80% compared with the corresponding values for smooth surfaces. In addition， the regression equations between the contact stress and the σ were respectively created for both the longitudinal and the transverse rough features. At the end， the paper draws a conclusion that the lubrication effect of teeth surfaces with transverse rough features is better than the one with longitudinal rough features.

The class Ⅰ synthesis problem of floating concave arc bottomed pushrod-disc cam combination mechanisms is not only an important content of its synthesis theories, but also the basis of its engineering application. However, the class Ⅰ synthesis problem is very complicated, it is difficult to be resolved at once. "Movement fidelity condition" is an important prerequisite condition of class Ⅰ synthesis problem. The "supporting function method" is applied to floating concave arc pushrod-disc cam combination mechanisms. The computational formula of curvature radius and "movement fidelity conditions" of the cam mechanisms were studied and solved， which met the premise of the class Ⅰsynthesis problem—preset the conditions of cam axis O₁（x_O1， y_O1）. The results lay an important theoretical foundation for solving the class Ⅰ synthesis problem， while the "supporting function method" is extended as a generic method to apply on new type combination mechanisms．