Applied Mechanics and Materials Vols. 121-126

Abstract: IP is the primary protocol that establishes the Internet; it is responsible for routing packets across network. IPv4 is the first version of the protocol to be widely deployed. IPv4 uses 4 bytes addresses, which limits the address space to more than 4 billion possible unique addresses. All of network devices construct on the IPv4. While the Internet widely deployed and used. IP addresses are being incrementally delegated to end users, an IPv4 address shortage has been developing. IPv4 addresses were insufficient for the Internet. IPv6 provide 2128 address and provide sufficient IPs for the Internet. But now the software and devices are only supporting IPv4. In this paper, we developed a new UTM appliance. The proposed system considers the integration of IPv4 network and IPv6 network in the Internet.

Abstract: Based on the requirements and characters of overall layout design of bus body, development process, overall structure, function module and deduction network of Intelligent Overall Layout Design System for Bus Body were built. It is illustrated systematically how the object-oriented modeling technology, deduction technology based on knowledge, secondary development technology based on CATIA, three dimensional parametric modeling methods and technology of database access etc were applied to the design and development of the system. The function of the system was verified through a case of specific bus body overall layout design.

Abstract: This paper analyzed problems exists in the modes of logistics management professional of certain college in the first place, and then the new mode of professional training concept is proposed based on the modularity and postponement in mass customization so as to enrich the knowledge structure of most logistic management students, reduce the complexity of teaching management, and meet the changing various demands of employer companies.

Abstract: This paper designs a class of generalized density function and from which proposed a solution method for the multivariable nonlinear optimization problem based on MCMC statistical sampling. Theoretical analysis proved that the maximum statistic converge to the maximum point of probability density which establishing links between the optimization and MCMC sampling. This statistical computation algorithm demonstrates convergence property of maximum statistics in large samples and it is global search design to avoid on local optimal solution restrictions. The MCMC optimization algorithm has less iterate variables reserved so that the computing speed is relatively high. Finally, the MCMC sampling optimization algorithm is applied to solve TSP problem and compared with genetic algorithms.

Abstract: Concerning to problems of the traditional machine pitch system for miniaturizing Micro Air Vehicles (MAVs), A novel asymmetrical pitch method is discussed in this paper. This novel method makes use of the deformation of an elastic linkage to generate the blade pitch meeting the requirement of the MAV flight mode control. Based on velocity control, phase control and mechanics analysis, Based on strain gauge and mercury conductive slip ring, mechanism experiments of deformation for different ratio of length and thickness and different elastic modulus of the elastic linkage which is key part in asymmetrical pitch system are done. From deformation curves of the elastic linkage, bigger ratio of length and thickness and smaller elastic modulus of the elastic linkage have bigger amplitude of deformation.

Abstract: In this paper, we considered a dual cycloid reducer(DCR) which consists of a planet gear with shortened epitrochoid and its conjugate ring gear. The geometric relations between a meshing gear pair were investigated to find the conjugate ring gear profile. It reveals that the three design parameters including the pin radii, the eccentricities, and the trochoid ratios should be identical to each other between meshing gears. Through the computer simulation for two examples, the proposed meshing conditions for the DCR are verified successfully.

Abstract: In setting threshold to determine the arrival time in mechanical vibration signals which are collected by sensors and contain noise, five methods based on MATLAB have been proposed. Direct observation of the figure, powering operation to data, variance theory, reverse search and MATLAB programming has been used. Each method’s merits and demerits will be discussed so that it can be varied according to different situations. Consistent results have been achieved by those methods. MATLAB code has also been presented for better understanding of the algorithm and reproduction. After this analysis, a systematic way of setting threshold (determining the arrival time) has been formed and these methods could actually be used in all similar data separation.

Abstract: This paper analyzed mechanical admittance for contacting point between gun and shoulder; identified inherent characteristic parameters, established model of gun-shoulder system base on plentiful experiments. The results that can not only reflect mechanical impedance property of the shoulder, but also embody the equivalent dynamic response property of man-gun system. Then, making statistics analyses for different shooter, confirming receiving-shoulder’s model parameter of man-gun, providing academic base for building mechanics model of man-gun.

Abstract: Taking the processing time ,the processing cost per workpiece as objective funtion,two optimization model is established.Multi-objective solving method based on nash equilibrium game model is put forward.Taking the sub-objective function of multi-objective optimization model as game party ,all design variable as strategy set,calculation steps of process parameter multi-objective optimization based on game analysis are founded .As turing technology an example,the result of analysis show multi-objective game design method is effective and feasible

Abstract: Multi-objective optimal design of frame structures was carried out by group search optimizer with Pareto solutions theory in this paper. A one bay frame structure was employed to evaluate the performance of group search optimizer. Calculation results show the stochastic algorithm has excellent performance in terms of convergence rate, feasibility, practicality and superiority in structure optimal design.