Applied Mechanics and Materials Vols. 543-547

Abstract: DEFORM is a software used for FEA (Finite Element Analysis) simulation. By using this software, I take a research on the procedure when a steel billet with defect of artificial loosening is drawn out in a simulated environment. Then I build a FEA model about the loosening and compaction of a large-sized rotor and stimulate the procedure in accordance with current craft card involving rotor forging. Finally, I get a result: the relative density of the loose area reaches up to 85% after the first drawing-out process (note: forging ratio 1.47). After simulating the procedure of chamfering on a billet which has been already drawn out, I found that chamfering had little substantial impact on the its loosening and compaction.

Abstract: In this article, circumferential SH wave propagation in functionally graded material (FGM) hollow cylinders is investigated. Based on the Kelvin-Voigt viscoelastic theory, the controlling differential equations in terms of displacements are deduced. By the Legendre polynomial method, the asymptotic solutions are obtained. Through the numerical results, the influences of gradient profile and the influences of the radius to thickness ratio on dispersion and attenuation are illustrated. The work is crucial for guided ultrasonic nondestructive evaluation for graded hollow cylinders.

Abstract: This paper analyzes the necessity of setting the travel time reliability as the optimization objective in distribution process. It based on traditional vehicle routing program models puts forward the problem of vehicle routing program problem on the basis of travel time reliability and establishes the corresponding optimization model. It also verifies the practicality of the proposed model in this paper by taking a logistic enterprise as an example. Therefore the established model of delivery vehicles which took travel time reliability as objective function has better application value for improving punctuality of distribution and level of service.

Abstract: The basic experiment and detailed simulations are carried out to study the aerodynamic characteristics of projectile with deflectable nose. The parameters of computation are revised on the basis of experimental data. Further simulations show that the influence of mach number and deflectable angle on drag, lift, pitching moment and flight trajectory. The drag coefficient increases firstly and then decreases with the change of mach number, while drag coefficient and pitching moment coefficient grows exponentially. It can be seen that the ratio of lift to drag increases consistently, which means the aerodynamic efficiency of projectile would be improved with the increase of deflectable angle and mach number. The range is influenced by the start time of deflection. For the projectile with deflectable angle 10, the maximum range can be obtained if the forehead deflects at 3s.

Abstract: Two factors have been selected to investigate the effects of environmental condition variations on pressure drop of draw resistance standard rods and a series of numerical simulations have been carried out. The results indicate that the pressure drop of draw resistance standard rod significantly increase with the rise of the ambient pressure but slightly decrease with the augment of environmental humidity. To compare with the effect of the pressure, the influence of humidity on the pressure drop is rather weak, which could be neglected during the actual measurement.

Abstract: With the continuous development of machine tool technology, the machine design requires more and more work for the precision and high quality direction. The design of the driving shaft for the whole machine tool has a very important influence. To improve the ability to make rational analysis and accurate dynamic performance of machine tool, this paper presents an analysis method of modal improved driving shaft based on the amount of calculation, the flow and the external factors are improved, the method can improve the design level of machine tool, making full analysis and detailed characteristics of the whole machine, for further improvement of the machine has a reference role in science.

Abstract: This paper aim at the integrated rudder propeller power transmission system which is specific to the towing and tugging ships rudder propeller system, presented an analyzing method with ducted propeller design. Analyzed the thrusttorqueefficiency and total pressure distribution law of blade in the condition of open water work of the propeller by means of finite element method. The numerical results and the flow details are concluded and compared with published experimental data, .Results displayed in good agreement with theoretical analysis results. Initially formed a whole process of design the rudder propeller from the initial ship type parameters to prediction of propeller under open water test condition, and had a certain reference value.

Abstract: A device for detecting slewing ring gear radial error has been proposed. In the detection device, the matching standard gear is connected with a Morses taper shaft in order to realize rapid replacement it, thus improve its detection efficiency. On the basis of the statics analysis of Morses taper shaft, its finite element model is established and its dynamic analysis is done in ANSYS software, the stress distribution of the Morses taper shaft is obtained. The result shows that it is safe and reliable with Morses taper shaft connection to realize rapid replacement of the standard driving gear.

Abstract: Three main steps to introduce the security work of helicopter load balance was illustrated in this paper, which contains how to choose the datum point, calculate the weight and moment and check whether the center of gravity (barycenter) is in the barycenter envelop. The correlative calculation and the analysis of barycenter envelop diagram to validate the feasibility of the method. According to the results of case study, an efficient referential method of the helicopter stowage was testified.