Applied Mechanics and Materials Vols. 427-429

Abstract: In order to deal with the small sample problem in practical reliability analysis of the diesel engine cylinder liner, the method and the steps of using support vector machine to build a regression prediction model to eventually develop the competing failure model of diesel engine cylinder liner are proposed. As proposed, more samples are generated by use of the regression prediction model and the quasi maximum likelihood method is used to separately estimate the occurring patterns of two failure models, including abrasion deterioration and pyrolysis. The scientificity and effectiveness of this method was demonstrated through calculation of examples and comparison of results.

Abstract: The theory for plates and shells with Reissners effect is adopted to analyze the crack problem for FGMs cylindrical and spherical shells. The higher order crack-tip fields for power function FGMs shells obtained by asymptotic expansion method are used, the eigen-solutions of the crack tip fields for arbitrary material functions of FGMs cylindrical and spherical shells which are similar to Williams solution are given by superposition principle.

Abstract: The driving theory and the dynamic characteristics of small radius steering, medium radius steering and big radius steering is analyzed, and the simulation model is established under Matlab/Simulink. Then the track bulldozers steering performance of the three sheerings is simulated. The results show that, at different steering modes, the running states of the two sides driving motors are not the same, and the track driving forces of the two sides vary widely. The track driving force is great in the small radius steering model, while small in the medium and big radius steering models. The simulation results lay the foundation for dual-motor drive track bulldozers steering performance matching.

Abstract: Simulation studies were carried out on the shaft of carpet tufting machine to establish multi-parameter dynamic balancing equations based on Matlab. Through the analysis and comparison of reaction forces between link and spindle before and after dynamic balancing, the optimal parameter solution was acquired under the ideal state. According to the actual situation in the project, the optimum value was obtained by modifying some parameters, which not only made mechanism achieve a better balancing, but also enhanced the transmission of motion performance and improved the operating environment of spindle system.

Abstract: Firstly, based on the structure of tufted carpet looms (DHGN801D-400), the lumped parameter models were built, in which included the massless shafts, lumped masses, disk and elastic support. Secondly, according to various parts of the relationship between force and deformation, the transfer matrix of right and left ends were established, thus the universal transfer matrix of shaft units was determined by solving the various parts transfer matrix simultaneously. Thirdly, the dynamic behavior model of coupling shafts in tufted carpet looms was given, and different natural frequencies were acquired by simulating the model in Matlab. Lastly, the dynamic behavior model using transfer matrix was verified to be effective and feasible by experiment.

Abstract: A new element-free formulation of Kriging interpolation procedure based on finite covers technique and Kriging interpolation method which integrates the flexibilities of the manifold method in dealing with discontinuity and the element-free features of the moving Kriging interpolation. Two cover systems are employed in this method. Mathematical cover of the solution domain under consideration are used to construct shape function and physical cover is used to reproduce the geometry of the solution domain. The mathematical covers can take any types of shape and is much easily formed compared with those in the conventional MM. The presented method can overcome some difficulties in conventional element-free Galerkin methods in treating discontinuous crack problems. The fundamental theory of this procedure is illustrated and numerical analyses of examples show that the proposed procedure is an effective and simple method with higher computational accuracy.

Abstract: To understand the nature of train dynamics to its in-service parameter effects during high operational speeds, multi-body system (MBS) modeling of a Chinese locomotive SS₉ was performed. Following comparison of the field test data with the simulation result shows that they agree with each other with considerable accuracy, thus, the MBS model established is validated and being effective for further dynamics studies. For demonstration, a case study was conducted and demonstrates that with the increase of effective series stiffness, the hydraulic yaw damper could dissipate the lateral vibration energy of the front bogie significantly.

Abstract: An autonomous underwater vehicle (AUV) with the advantages of compact structure, good mobility and low-cost will be better used in the field of marine scientific research and military application. This paper introduces the bottom-level control subsystem and autonomous navigation algorithm of the low-cost AUV. In order to prove that the control system has good robustness, some simulations and lake tests were conducted. The results show inertial navigation algorithm based on AHRS, digital compass and GPS can achieve good performance.

Abstract: With the development of governing the Yellow River by the technology,it is inevitable to research the construction equipment to adapt to flood-prevention work. The cluthing and casting excavator for flood-prevention is produced under such kind of background. This equipment based on the working device of backhoe track hydraulic excavator was improved, the computer technology is introduced in the design of working device which can be for three-dimensional modeling,assembly and motion simulation analysis. The virtual design by Pro/E for the structural and motion of produces can short the design and manufacture time and cut down the cost, thus it can save the massive funds.The completive power of society is strengthen.

Abstract: This article systematically illustrates the concept of the fractionated spacecraft and analyzes the project evaluation and the optimized designs of fractionated spacecraft system from domestic and foreign scholars, then based on those, they presented a new index that random task cycle costs should be regarded as a comprehensive assessment criterion. Next, through modeling the uncertain cost of module development, launch/deployment and full task cycle of Monte Carlo simulation, it provides random task cycle cost of every configuration scheme. Lastly, it establishes the partitioning criteria and partitioning method system for fractionated spacecraft, with further modules' partitioning road map based on pedigree clustering method. The optimized designs are determined according to classification level combined with the actual situations.