Advanced Materials Research Vol. 904

Abstract: The tracked combine agricultural machinery is a most complex in structure, high technology content, the manufacture technology of very strict requirements of product. Our crawlers combine 1/3 of the fault from the walking gear system in operation. This paper adopts the planetary wheel transmission, because it has the advantages of compact structure, small volume, large transmission ratio, torque / volume ratio, high efficiency, and high reliability, meet the structure and characteristics of the combine harvester. This technology can save the transmission assembly, avoid the fault of gearbox assembly; improve the combine harvester of paddy field through. Keywords: Mechanical design;Combine Harvester;Planetary Gear;Transmission Technology

Abstract: How to locate accurately positioning of underwater noise source is the most important link of underwater vehicle fault detection and diagnosis. In this paper, Near-field Acoustic Holography technique is applied to detection and location of noise sources of underwater vehicle, to collect radiated noise information of noise source. A LABVIEW-based underwater vehicle sound pressure measurement system is designed, which has capacity to detect and locate noise sources of the underwater vehicle, so that the fault positioning of underwater target can be located and excluded easily.

Abstract: This paper analyzes the structure of plastic parts of the mold national occupation colleges skills competition in 2012. The mold structure was designed, and 2D assembly drawings was drew. The curved surface of the mold parting, core-pulling and key technology of submarine gate was analyzed. The mold was compacted in structure, meeting the requirement of product technology.

Abstract: If the gap between the curved plate and throw cut tobacco roller of the throwing tobacco agency in PROTOS cigarette machine is improperly adjusted, easily lead to the curved plate wear faster, tobacco-made pieces increases, short cigarettes increased. However, there is no a adjust tooling for the curved plate. To solve this problem, a new type of curved plate adjust tooling is designed. The three movable reference wheels used to test and adjust the gap instead of the reference plane. The application results show that the new tooling is an effective solution to solve the installation and adjustment problems of the curved plate. The installation and adjustment of working hours decreased from 2.5 hours to 1.5 hours. It also ensures the curved plate mounting quality and precision requirements and reduces tobacco-made pieces rate and cigarettes short rate.

Abstract: The aim of this paper is to study the influence of hull deformation on dynamic behavior of ship propulsion shafting. Taking an 8530TEU container ship as an objective and using the finite element method, a global ship structure model is built up to evaluate the hull deformations under typical loading cases. Then the hull bottom-propulsion shafting integrated model is adopted to analyze the effect of hull deformation on shafting natural frequency under dry and wet mode. The results show that the natural frequencies of the shafting will increase due to the effect of hull deformation. Consequently, it is necessary to consider the effect of ship deformation when dealing with the dynamic behavior of ship propulsion shafting.

Abstract: A method for the double impulses extraction of faulty rolling element bearing (REB) is proposed in this paper. In the proposed approach, the (Ensemble Empirical Mode Decomposition) EEMD are employed for filtering the random noise and high-frequency continuous noise without any mode mixing. Then, the extracted signal is filtered with complex Morlet wavelet, which enhanced the double impulses greatly. As a result, clear double impulses can be obtained through the envelope. The effectiveness of the approach is demonstrated by the simulation study.

Abstract: Since it is too complex to make the engine connecting rod design digital and too amount of work to make mistakes, a method based on the CATIA to achieve the engine connecting rod digital design is proposed. Firstly, the parameterized modeling of connecting rod is completed based on secondary development of CATIA. And then, the finite element analysis is applied to the model. Finally, the analysis results verify the effectiveness of the proposed method.

Abstract: This paper adopts nonlinear finite element method to study the load bearing behavior of ship stiffened plates with different dimensions. The research focuses on the compressive ultimate strength, axial rigidity, and residual plastic deflection of the stiffened plates under cyclic compressive and tensile loads. The results indicate that the compressive ultimate strength and axial rigidity of stiffened plates decrease with the incremental cyclic loads significantly, meanwhile, the residual plastic deflection increases with the cyclic loads.

Abstract: Hull deformation directly influences the working condition of propulsion shaft, so that the reasonable and accurate calculation of deformation is the basic content of research on ship propulsion system. This paper, basing on a large container ship, built up an integrated finite element model of the hull with the propulsion shaft. By employing inertial relief method, the hull deformation at place of shaft supports is calculated under different loading conditions. The results are compared with those from a hull FEM model without shaft. Some valuable conclusions are made from the results analysis.

Abstract: In present study, the mechanical properties of disc-spring vibration isolator with viscous dampers is investigated by finite element analysis (FEA) and experiments. The result of FEA and static test reveals that frictional damping has significant effect on the static stiffness of combination vibration isolator, the ability to strengthen loading stiffness and lower unloading stiffness. However viscous damper has no effect on the static mechanical properties. The dynamic experiment shows that the dynamic performance of combination vibration isolator can be greatly improved with viscous dampers. Viscous dampers have little effect on dynamic stiffness of vibration isolator, but significant effect on damping characteristics. These conclusions are of significant importance in the analysis and design of combination disc-spring vibration isolators.