Advanced Materials Research Vols. 945-949

Abstract: a general mathematical model for describing tooth surfaces of a helical gear. Normal vector of tooth surface are introduced to deal with the model. The tooth surface of a helical gear could be generated directly by giving two basic parameters and . It is believed that the model may provide a simple logical method for the design and manufacture of helical spur gears.

Abstract: Spur gears are widely used in industry where the power transmission is required at heavy loads with smoother and noiseless operation. The study in this paper shows that the complex design problem of spur gear requires superior software skills for modeling and analysis. The problem been has solved using Pro/E and ANSYS software which provides equivalent results to that of AGMA. In this paper, spur gear was modeled using Pro/Engineer wildfire 4.0 and stress analysis was carried out using ANSYS 11.0. The results obtained from both AGMA and FEM were compared and found to be approximately similar.

Abstract: This paper, taking the involute spur gear as a research object and using the LISP module embedded in AutoCAD, studies how to realize the drawing of two-dimensional graphics of the involute tooth profile and keyway of spur gear effectively and efficiently. The study, using the commands, such as stretch and Boolean operation of AutoCAD after programming, has realized the parametric modeling. By using this method, one can model them quickly, and lay the foundation of the assemble and analysis for the next step.

Abstract: In order to solve high-speed gear parametric solid modeling technology, improve the accuracy of design calculations gear, based the involute of inclined cylindrical gears tooth profile formed the basic principles, in the UG software system and through VB programming using UG’s parameter expression to modeling, constructing parameterized solid model of locomotive traction gear and the modeling of transmission. Analyzing and calculating with ADAMS software that the dynamic performance of gear system, provides the basis for speed ​​gear strength and parameter optimization.

Abstract: The gear mesh stiffnesses have been regarded as constants in most previous models of geared rotor-bearing systems. In this paper, a dynamic analysis of a spur geared rotor-bearing system with nonlinear gear mesh stiffness is presented. The nonlinear gear mesh stiffness is accounted for by bending, fillet-foundation and contact deflections of gear teeth. A finite element model of the geared rotor-bearing system is developed, the equations of motion are obtained by applying Lagrange’s equation, and the dynamic responses are computed by using the fourth-order Runge-Kutta numerical method. Numerical results indicate that the proposed gear mesh stiffness provides a realistic dynamic response for spur geared rotor-bearing system.

Abstract: In this paper, a model of a gear with a crack for dynamic analysis is established based on finite element method. Internal dynamic excitation in the process of transmission is calculated by numerical simulation method. Dynamic response analysis with a crack is carried out and simulated by using a full method successfully. Fault signals are analyzed in time and frequency domain, and compared with signals from a normal gear. Results show that cracks have obvious dynamic effects on gear structure, which lay the foundation for the fault diagnosis and analysis.

Abstract: Based on the new type of wheel-track variant wheel prototype which is developed independently and creatively, the paper focuses on several problems, including the severe wear of track links, the difficulty in steering under the form of track, and so on, and combines the characteristics of variant wheel, so as to design and analyze the positional parameters of variant wheel-double wishbone suspension module. Besides, through refitting the variant wheel based on a type of all terrain farmer truck (UTV), the paper builds a model for the kinematics analysis of UTV variant wheel—double wishbone suspension model, and takes the minimum of the weighed sum of changes in wheel alignment parameters and the lateral displacement of variant wheel which affect wheel wear and steering as the optimized objective, so as to carry out an optimization calculation for its suspension system. In addition to that, the paper modifies UTV based on the optimization results, solves the problems arising in the experiments of variant wheel, and provides theoretical support and references for the application of wheel-track variant wheel in other types of vehicles.

Abstract: To improve load capacity of fabricated single-arm planetary carrier, and enlarge its applied fields, the calculation criterion of load capacity of fabricated single-arm planetary carrier under given interference amount is described according to relevant calculation theories in this paper. Some experiments have been carried out to verify the influence of different interference amounts forced on load capacity, and also the variation of force is confirmed while the planet wheel axle is pressed into the body of planetary carrier with given interference amount. The theoretical basis and reference of fabricated single-arm planetary carrier is ultimately put forward and applied in some relevant engineering practice.

Abstract: The hydroforming process of differential gear box for automobile under axial compressive load and internal bulging pressure was simulated and the load paths were optimized. The hydroforming process is divided into two steps. The deformation under different load paths was investigated using dynamic explicit finite element method. The distribution of equivalent strain and thickness was investigated as well. The simulation results show that the forming path for the first step is optimal when internal pressure changes linearly from 37MPa to 65MPa with the axial displacement.

Abstract: Spanwise penetration depth as a new correlating parameter was introduced in the cascade profile loss correlation of a new loss breakdown scheme for turbine cascade reported in the literature. For the case of an inclined turbine disk, when a turbine disk is inclined to its design position, the blade incidence or inlet flow angle varies with the position of blade on the turbine disk circumference, leading to the variation of spanwise penetration depth. To examine the influences of turbine disk inclination on the spanwise penetration depth, new correlations were developed and numerical simulations were performed with MATLAB. The role that turbine disk inclination plays in the spanwise penetration depth is manifested in a modified inlet flow angle expression on account of turbine disk inclination. It is concluded that the turbine disk inclination has considerable influences on the spanwise penetration depth in the turbine cascade passage.