Applied Mechanics and Materials Vol. 389

Abstract: As an extension of hesitant fuzzy sets, dual hesitant fuzzy sets can depict the attitude when decision makers give their certain or uncertain hesitant fuzzy evaluation information. In this paper, we develop the dual hesitant fuzzy ordered weighted averaging (DHFOWA) operator and the dual hesitant fuzzy ordered weighted geometric (DHFOWG) operator, study their properties, utilize them to aggregate dual hesitant fuzzy decision making information and verify their effectiveness and correctness.

Abstract: Based on the theory of projective correspondence, the principle of affine correspondence and projective correspondence is proposed to resolve the intersection of non-circular quadric curved surface (NCQCS). According to the theory of projective geometry, the intersection that NCQCS intersect with a set of parallel planes is a group of homothetic curves. Taking the homothetic curves as corresponding element, spatial projective correspondence between any two homothetic curves is constructed. Similarly, the intersection that any NCQCS intersected by a set of planes through it axis is a group of similar curves. Taking the similar curves as associated element, spatial affine correspondence between any two similar curves is constructed. The intersection and drawing theory, method, application and technology for the NCQCS provides the theoretical and practice support for the intersection of the NCQCS.

Abstract: The thesis finds the bottleneck restricting the efficiency of enterprise operational from capacity allocation of the small pieces cargos terminal transportation in CRE. The transport organization is optimized by the merge of pickup and delivery. And the use of mobile-cars strengthens the time limit of express service program. On this basis, the optimization of the transport organization is proposed: First, it builds the model and designs algorithms to get the path planning of pickup and delivery. Then combined with the reality factor, it completes timely dispatching command. At last, to prove the feasibility, it uses the optimized organization of terminal transport on a real case, and gets a better result with the total working time reduced by 30%.

Abstract: In order to achieve demand for high speed, high precision, high real-time performance, high stability, its more essential to algorithms of motion control. In this paper, two different types of interpolation methods design are time-divided method and digital integral method. So control system trajectory data processing speed higher, output pulse signal response fast, system error small, transient response fast, and stability system.

Abstract: This paper investigates the built-in spatial modules extended with reconfigurable character based on reconfiguration modules in the form of spatial kinematic pairs and associated links. Known that reconfiguration modules are to be served to develop reconfiguration leading to novel structure expansion, the key issue is to assemble reconfiguration modules and to derive a reconfiguration mechanism as a self-reconfigurable set. The module exerts its reconfiguration through changing the number of mobility or type of its built-in kinematic pair and changing its combined components. Its reconfiguration characteristics come from its decomposition, transformation, degeneration and combination. It is clear that reconfiguration module extension serves as an effective category to set up the relationship and transformation categories between these reconfiguration modules. More often, there exists multiple module group solutions for a higher dimensional module and this is the key for topology reconfiguration and variation. Spatial reconfiguration process uses reconfiguration principles which is consistent with displacement group operations. The essence of reconfiguration is the reconfiguration mechanism characteristic which convert a mechanism from fixed topology to variable topology analogous to evolutionary variation. In fact, these can be the effective and available constraint information as geometrical ways to reach the special configuration states and then produce reconfigurations with special geometric and parametric dimension design.

Abstract: The Lamb wave phased array theory is utilized to analysis the damage scattered signals to identify the structure defect. The damage scattered signals are gotten by comparing the health signals with the damage signals. Phased array theory based structural health monitoring can scan the structure in a certain range of 0°~180° by controlling the time delay of the excitation signals and the response signals. The processed signals in monitoring direction is shown on 3-D imaging to express the damage location in the structure. The method is verified by the experiment on the composite structure and the result shows that the Lamb wave phased array method can detect the damage in the composite structure and the 3-D image clearly displays the structure damage location.

Abstract: Cloud data centers hosting cloud applications consume huge amounts of electrical energy, contributing to high operational costs and carbon footprints to the environment. When virtualized resources of cloud data centers are allocated, the energy consumption is a problem to be considered necessarily. In this paper, three energy efficient virtual machine allocation algorithms are carried on experimental analysis, including MAX, DVFS and dynamic deployment algorithm (DDA). We have evaluated these algorithms by conducting a performance evaluation study using the CloudSim toolkit. The experimental results show that the dynamic virtual machine allocation algorithm like as DDA is more energy-efficient and the virtual machine migration is an efficient saving energy method.

Abstract: With the rapid increase of automobile, as a transportation tool, the automobile transport efficiency is also put forward higher requirements. Transport efficiency of the automobile depends largely on the power performance. Power performance is the most basic and important performance of the automobile. Power performance is good or bad directly affects the effect of automobile driving on the highway. Generally, a power performance calculation and simulation is necessary in the new car development. It is used to guide the design whether meet the requirements of the design index and use. According to the general method of calculation and simulation about automobile power performance, this paper combining with a car carried on the power performance calculation and simulation. It has reference value for studying, researching and developing automobile.

Abstract: This paper presents a 6LoWPAN-based distributed energy efficiency of the terminal design, the distributed terminal node hardware and software design are discussed in detail and discussion. Packet reception rate of the nodes in a small experimental platform, the average delay time and the average consumption of energy and other performance parameters were analyzed. Experimental data show that the terminal node can well realize the IPv6 node interconnection of distributed energy efficiency and ensure its continuity.

Abstract: Traditional discrete method, converting order continuous system to order difference equation, describes system using the information of sampling points. But the system response in the time of will not be sufficient to describe the system when sampling period is much larger than the bandwidth of the system. By analyzing differential discrete method, our design gives an improvement to take out of the influence of the system bandwidth. In this method, order continuous system is transformed into order difference equation and the information of sampling points can be used to describe the system. It is proved that modified difference transformation is better in interference rejection than traditional difference transformation by comparing the simulation between the two transformations. The hardware implementation using TI's TMS320F2808 shows that modified difference transformation has a deviation close to round-off error based on simulation with a linear increase of operating time.