Applied Mechanics and Materials Vols. 490-491

Abstract: Free and constraint modal finite element analysis were conducted on S385 diesel engine block using FEA according to its structural characteristics. The natural frequencies and corresponding vibration modes of the first fifteen steps of each condition of the block were worked out using Lanczos method. By the analysis of vibration modes, the weak spots of the block were found and corresponding improved schemes were brought forward. The analysis results supplied a theoretical support to improve the structural design and the dynamic response analysis of the block.

Abstract: Focus on stress concentration and high stress area, four improvements were put forward through analyzed a hydraulic excavator's boom with the finite element method under the bucket digging condition. Compared the stress distribution graph, the results show that these schemes can improve the stress concentration phenomenon and the high stress distribution areas. The practices demonstrated the effectiveness to reduce the invalidation rate of hydraulic excavator's boom.

Abstract: To solve the problems of unstable process, frequent change and difficult management in assembly process of complex products, by introducing the workflow technology, the reverse process flow was defined based on analysis of assembly process execution and feedback process. The information model of process feedback was presented and a workflow based assembly process control and management method was proposed, and the real-time feedback of technology problems in workshops, the automatic running of reverse process as well as the assembly BOM based integrated management of process information were realized. The feasibility of proposed method was proved by actual engineering applications.

Abstract: A bulk ship is used for the research object. The simplified model of ship engine room is built, and which is based on the idea of multilayer geometric structure. The fire in ship engine room is simulated by using the software of FDS (Fire Dynamics Simulator). Also, under the condition of the speed of inlet air is 1m/s, 2m/s, 3m/s, the change law of the spread speed, the concentration and the temperature of smoke are analyzed. The results show that the speed of inlet air has a greater influence on the change law of smoke. In addition, when the air speed is 3m/s, the smoke concentration is minimal in the ship engine room, but the decreasing amplitude of temperature is maximal. The results can supply a theoretical foundation for smoke control in ship engine room with multilayer geometric structure.

Abstract: The characteristics of Dalian Maritime University, Transas and Furuno radar simulators are described. The current radar target echo simulation technologies are researched, such as radio echo modeling, radar target echo image simulation and rendering. Finally, to put forward a radar 2D simulation method, including terrene rendering, rain/snow rendering, sea rendering and target ship rendering.

Abstract: A graph based property representation enables partly automation of the function decomposition. The first step in design is to decompose the main function into subfunctions. To partly automate this process, a key issue is to establish a computational decomposition process. This paper transforms functions into properties of substructures and their relationships, and uses weighted graphs to represent properties. The graph represented property is then induced into a group of properties by induction mechanisms. This process is conducted automatically. The contribution of this paper is a method to automate the design function decomposition.

Abstract: Using Solidworks establish the virtual prototype of the conventional beam pumping unit. After that, by using ADAMS moves on to the kinematics simulation of prototype, detailed the polished rod motion parameters curves are present. When compared the results with the calculation results of accurate analysis method, discovered that these two results of different methods coincide quite well, and the reliabilities of simulation results of using virtual prototype technology. are validated. The optimal design of pumping unit skeletal structure parameters is explored in this paper, taking the polished rod acceleration as objective functions. From the simulation solution, we get the optimal structure and size of pumping unit. Virtual prototype technology provides a kind of economical, fast and reliable way to design and optimize structure of the pumping unit.

Abstract: In this paper, by combining methods of LMS Test.Lab test systems analysis and Ansys finite element analysis on the rack of batching mixer system for dynamic performance analysis, the ODS and the modal parameter of the batching mixer machine rack is obtained. Two research methods results show that, the weakness of the rack vibration is that there is large vibration deformation on the stands of two sides and two beams above the rack. The corresponding parts need firming connection to reduce the vibration of left and right sides, before and after the rack, and improving the working stability of batching mixer machine rack. This paper provides a valuable reference for the vibration and noise control of batching mixer system.

Abstract: Regularization parameter and kernel parameters play a crucial role on the accuracy and rapidity of the least squares support vector machine (LS-SVM) algorithm. Existing methods of tuning the parameters for LS-SVM have some disadvantages, such as difficulty of getting global optimum and poor convergent speed. In this work, we develop the parameter design of LS-SVM using quantum particle swarm optimization (QPSO) and apply the designed LS-SVM into node localization. According to the initial values, the optimal parameter values are obtained using the leave-10-out cross validation method. Simulation results show that the proposed method is compared to the coupling simulated annealing (CSA) LS-SVM and the improved particle swarm optimization (IPSO) LS-SVM.

Abstract: This paper surveys the status of nonlinear, and adaptive flight control, and summarizes the research being conducted in this area. A description of the controller architecture and associated stability analysis is given, followed by a more in-depth look at its application to a tiltrotor aircraft. This is followed by a summary of future research directions, and possibilities for technology transition that are currently underway.