Advanced Materials Research Vols. 199-200

Abstract: In this paper, the principle of work of aerial work platform truck luffing system is introduced and The mathematics model is established. With Matlab/Simulink software, the simulation model of luffing system is constructed, meanwhile the dynamical characteristics is implemented. With the research work of aerial work platform truck luffing system, this paper provides theoretical foundation for design and improve of luffing system

Abstract: This paper established a high-speed tracked vehicle dynamics model, and simulated the transient response of sprocket when the vehicle is running at 60km/h on the D class road. the finite element model of the single tooth in mesh is established in Ansys and the rigid-flexible coupling model of "trackboard- sprocket" is established in RecurDyn. The dynamic stress and strain fringe of the sprocket’s gear ring is achieved by analysis. Simulation results show that the stress of tracked vehicle sprocket gear root and the fixed gear bolt hole is larger, and the stress concentration is detected at the edge of contacted tooth. The simulation results provide the calculation basis for the optimization of the high-speed tracked vehicle system and its lifespan prediction.

Abstract: The spatial temperature distribution in the target range of the ICF driver is one of the key factors, which affects the precision optical components and equipment for normal operation. Application of the basic theory of heat transfer, this paper has discussed the fluid motion mathematical model in ICF driver middle target range. With the aid of finite element analysis software FLUENT, the temperature Numerical Analysis Model has been established. In accordance with assuming the numerical simulation boundary condition, spatial temperature field distribution in the target range intermediate level has calculated. The results indicate that the target range intermediate level temperature field is uniform basically. The temperature fluctuation scope is in a tiny range around 23°C about in the entire space. Although the maximum gradient of temperature achieves 1.2°C in existence heat source region, it is in the range of temperature indicators. This indicates that the present HVAC system can satisfy the request. By analyzing, the results of numerical analysis are in good agreement with experimental results, because the error is only 0.2%.

Abstract: The excessive deformation of walking beam which is used in automatic packaging line of cathode copperplates is analysed. The mathematical model of optimization design of the walking beam is established, using deflection less than 7mm as a constraint condition. The optimization is completed by COSMOSWorks and the most optimal deflection is 6.95mm, the most optimal mass of the walking beam is decreased 25.2%. The optimization also indicates that strength of the walking beam is surplus and further optimization is feasible.

Abstract: The effect of specimen overhang on contact state between specimen and supports has been investigated by analyzing stress wave propagation in loading bar, specimen, and supports in Hopkinson bar. The results show that the time for loss of contact decreases with increasing overhang. The criterion is obtained for keeping the specimen contact with supports under a fixed of the specimen thickness and width.

Abstract: It discusses the measurement principle and the mechanical structure of 3D non-destructive measurement device for the homogeneous entity. The measurement project and its operating process is discussed. The basic operation principle and components of this measurement device are pointed out. Based on the modern design theory, optimization design, dynamical design, the mechanical structure of the device is analyzed and improved for assuring measurement precision, structural intensity, and vibration characteristic of the device. The primary experiment devices and their precision are designed and analyzed. Proved through principium experiment, the structure satisfies the request of the measuring precision. The mechanical structure of this measure device is effective and feasible.

Abstract: Some researches have been done to solve the important problems, such as the shape of end cover and consequence part shear force and bending moment calculation. The solutions have been done by theoretical analysis. Formula and charts used in designing are given as follows.

Abstract: Improving the cutting performance, especially the cutting quality of sugarcane harvesters is the most magnificent problem for popularizing the application of the havesters. Much research has been done on most effect factors but rare on the influence of rigidity enhancement of sugarcane cutter. Indeed, the rigidity of sugarcane cutter has notable influence on the quality of sugarcane cutting，as it effects its vibration and the vibration in turn brings great damage to the cutting quality. This paper analyzes how the rigidity of sugarcane cutter effects its working vibration by building up its mathematical model, then further investigates it by making a dynamical simulation analysis to compare two cutter structures with different rigidity based on ANSYS and ADAMS, and validate the actual effect of enhancing the cutter rigidity through a physical experiment. The result shows enhancing the rigidity of the cutter could lead to notable improvement of sugarcane cutting quality.

Abstract: A new ultrasonic peristaltic micro-fluid driving model was presented on the principle of ultrasonic traveling wave and volume displacing mechanism. First, driving principle of the model was introduced and finite element model was developed. Second, the transient dynamics analysis was performed to observe the chambers traveling and the fluid flowing. What’s more, harmonic analysis was done to get its amplitude-frequency response characteristics. Third,the coupling modes filled with fluid was performed to prove its drivng effect. This can provide a guidance for furture fluid structure analysis to get better performance and efficiency.

Abstract: This paper presents the defects existing in shaking table control including the overshoot of displacement under low-middle frequency input using three variable parameter controls, the narrow bandwidth resulting from the performance of servo-valve and low accuracy of seismic wave reproduction because of specimen and table interaction. The effects of these factors on the stability and control accuracy of shaking table are discussed, and then the reasons of these problems existing are analyzed. The aim of this paper is to improve the stability and control accuracy of shaking table, thus, some corresponding strategies for compensation control are proposed. And a series of shaking table tests with one-story frame and two-story frame for verifying the validity of compensation control algorithm are performed.