Advanced Materials Research Vols. 295-297

Abstract: A novel algorithm for the ball-end mill relief using a five-axis computer numerical control (CNC) grinding machine and the simulation of the ball-end mill based on a CAM system is presented in this paper. In this study, In order to obtain an accurate normal relief angle, which is one of the key factors affecting tool cutting performance, a tool coordinate system based on the required relief angle and the cutting edge was established. Then, by the proposed tool coordinate system, an algorithm to determine the position between the grinding wheel and the tool is proposed, and then the relevant formulations are deduced. The coordinates of grinding point when the step of relief surface is grinded are calculated.Using the input data of a ball-end mill geometry, wheels geometry, wheel setting and machine setting, the NC code for machining will be generated. Then the code will be used as input to simulate the ball-end mill machining in 3 Dimension before real machining. The algorithm of ball-end mill relief can be authenticated by the 3D simulation system.

Abstract: An approach for structural optimization with uncertainty is proposed in this paper, which is based on stochastic finite element analysis and an optimality criteria method. The sensitivity analysis of the structural failure probability via design variables are performed by difference method according to stochastic finite element analysis. The information of the partial derivatives is incorporated into the optimality criteria method. The optimization of the section of a beam with uncertainty, as a numerical example, is illustrated by the approach. The results demonstrate the efficiency of the approach.

Abstract: There are wide molded breadth and molded depth of the deck barge, so the ship specification cannot be used to calculate the deck barge’s wave-induced load^[1]. According to the deck barge’s characteristics its wave-induced load has been calculated using 3D-dimensional hydroelasticity theory in the present paper, the dry-modal model and panel model have been established, and the oscillating pressure and wave-induced load have been calculated. The calculation results show that the method is reasonable to calculate the wave-induced load of the deck barge.

Abstract: The tooth profile of arc gear is no longer arc after hob process, it’s a section of curve which is similar to the arc. Although there have been confirmed that this curve which is similar to the arc can make sure that the transmission ratio and meshing point of two gears will not change ,pressure angle at the meshing point will certainly change, and there is also no literature report how much this curve has impact on pressure angle. The impact of meshing transmission of arc gear by central distance error researched by current literature is based on arc tooth profile, this study is not suitable for the tooth profile processed by hob, and there is no literature report how much central distance error has impact on transmission ratio, pressure angle and mesh point of arc gear which processed by hob. In this article, the author has work out this problem by use tooth surface equation.

Abstract: Power control unit (PCU) is an important component of space power system on satellite; it provides power supply to main bus and regulates output status of solar battery array in light district. So it is very important to test the performance of PCU before equipped in satellite. A semi physical test system for PCU is developed in this paper, some Agilent simulators are used to simulate working environment of PCU, and control software is programmed to control these simulator as well.

Abstract: AKD Rolled Steel Bundling is automatic equipment which is suitable to bundle and pack the clavate or tubular steel. It is developed by Technical Garden Company affiliated University of Science and Technology Liaoning. The design of this type equipment involves multitudinous domain knowledge such as Hydraulic transmission, Electrical Control and Machinery. Therefore, an advanced design technology for virtual prototype is introduced into it. A comprehensive test is carried out on the virtual machine model without the physical prototype.

Abstract: The simulation analysis and research on crank linkage mechanism, which is the core part of the engine, are of important significance. Based on related theory, this paper introduces a simulation analysis method for crank linkage mechanism, which is using Pro/E. First of all, the 3D model of the mechanism is build; all the components are modeled and assembled. Then dynamic simulation for the crank linkage mechanism by using PRO/Mechanism is carried on, the result of characteristics of motion, stress, etc of the mechanism are shown. A more effective method about the simulation analysis of crank linkage mechanism is introduced in this paper.

Abstract: The accuracy and real-time of velocity measurement impact on the performance of the motor servo system. Incremental optical encoder measuring velocity have advantages of high accuracy and easy-to miniaturization. The typical method for velocity measurements by Incremental optical encoder is hybrid M / T method. The method is poor in real time. Raised alternate M/T method for velocity measurement. Design the software and hardware for the M/T method. The experiment results show the feasibility and correctness of the system, and the method improves the system with photoelectric encoder in real time.

Abstract: The output speed of ESPCP system is caused by the coupling of multi-factors and it is a typical nonlinear optimization problem. The key factor affecting life of progressing cavity pumping system is the rotor speed. The associated constraints depends on the physical and chemical conditions including pressure difference between pressure difference of the pump two ends, oil viscosity, temperature and wear clearance, etc. Taken these parameters as original inputs, the nonlinear mapping relationship between rotor’s rotational speed and its affecting factors are determined by means of artificial neural network, and establish the output speed prediction model. After the simulation through samples study and by combining field data, it shows that the predicting results is basically in accordance with the observation data, and acquire satisfactory results. The research results show that the artificial neural network is an ideal method of ESPCP system speed optimization.

Abstract: The approximate model of the muzzle brake performance was set up and evaluated to simplify the analysis process. LHS(Latin Hypercube Sampling) and numerical simulation of inviscid muzzle flow field were applied to obtain some samples of the muzzle brake performance. The performance was weighted with the impact force on the muzzle brake. Then RSM(Response Surface Method) was adopted to get the approximate model of the muzzle brake performance to establish a mapping of muzzle brake shape parameters and the impact force. In the end GA(Genetic Algorithm) was applied to perform the optimization of the muzzle brake shape parameters with the approximate model.