Kang Huang

Dynamic Modelling and Analysis of the Microsegment Gear

The development of technology requires higher load capacity, rotating speed, power-weight ratio, lower vibration, and noise with respect to the gear transmission. The new type microsegment gear’s tooth profile curve is composed of many microsegments. Previous researches indicate that the microsegment gear has a good static performance, while the dynamic behavior of the microsegment gear has never been investigated. This paper will focus on the dynamic performance of the gear. The profile deviation between microsegment gear and involute gear is regarded as a displacement excitation in the proposed dynamic model. The numerical analysis for three cases is conducted and the results shows that, in low-speed and heavy-load, medium-speed and medium-load conditions, microsegment gear and involute gear both exhibit a good performance, while, in high-speed and heavy-load condition, microsegment gear has a better performance than that of involute gear. The influence of backlash on the dynamic performance is also studied. It is found that the variation of backlash does not change the type of motion, but the vibration amplitude and the stability of the motion are much affected. The main idea in this paper is supposed to provide a novel method for the precision grinding of the microsegment gear.

Using Movement Range Strategy of the Improved Ant Colony Algorithm for Solving Continuous Problems

The discrete nature of ant colony algorithm (ACO) and the characteristics of the distributed parallel computation and positive feedback had been made it widely used in discrete space problems, but it limited its application in continuous problems and now studies was relatively few. Articles improved the basic ACO to solve problems in continuous domain. The algorithm improved the way of pheromone to keep, update and advance, and limited it in a Max-Min interval at the same time, avoiding the stagnation and restricted diffusion of the algorithm, enhanced the performance of convergence. Simulation example proves that the improved ACO can quickly find good global solution on the continuum.

Multi-Objective Optimization for the Efficiency and Weight of Helicopter Transmission Planetary Gear Train

A multi-objective optimization method for the optimization of the efficiency and weight of helicopter transmission planetary gear train was established. Taking the transmission ratio, efficiency weight, and reliability as critical design parameters, taking the conditions of the planetary gear train itself and the strength check constraint for the gear train as constraint functions, making the weight and efficiency of the planetary gear train asoptimization targets and using the Matlab function fgoalattain, a multi-objective optimization has been made. Comparison between the initial and the optimized results showed the success of the optimized planetary gear train in reducing the weight and increasing the efficiency.

Analysis of Helicopter Engine Crankshaft Torsional Vibration Based on ADAMS

To address the problem of helicopter engine crankshaft fracture in engineer, this paper carried out an analysis of an inline four-cylinder engine torsional vibration, applying virtual prototyping technology based on ADAMS. According to this analysis, draw several orders of crankshaft torsional vibration natural frequency and the main vibration modes. This paper carried out a harmonic analysis of the disturbing torque acting on the crankshaft and torsional vibration amplitude of the free end relative to the flywheel, and obtained Critical speed map of crankshaft torsional vibration. These results can offer theoretical basis for engine optimization design.

Analysis of Helicopter Main Reducer Planetary Gear Contact Strength

Theoretical method and the finite element method for a helicopter main reduction gear of the planetary gear train are done this article. The contrast drawn: the reliability and accuracy of the finite element simulation method used in the calculation of tooth surface contact stress. Provides an effective approach for accurate analysis of helicopter main reduction planetary gear contact stress.

Fatigue Life Prediction of Vehicle Transmission Shaft Assembly without Intermediate Support

Vehicle transmission shaft assembly is an important component of automotive transmission, parts of which are facing the problem of prematurely resulting in fatigue failure. This paper responding for needs in this area, puts forward a method to predict fatigue life of vehicle transmission shaft assembly without intermediate support, based on workbench finite element software and fatigue software modules. With this method, we found the fatigue failure parts of the transmission shaft accurately and the specific location of the failure zone on the parts, which provide the technical basis for the further optimization of parts. And then contrast analysis of results with the actual fatigue fracture, it shows that the method is effective.

Vehicle Horizontal Hollow Stabilizer Bar’s Stiffness Calculation and Fatigue Life Prediction

Vehicle horizontal hollow stabilizer bar was born for car’s weight losing, but its stiffness and fatigue life has been being the focus of research. For the problem, this paper gives a new method to calculate hollow stabilizer bar’s stiffness and predict its fatigue life with finite element software and MSC, Fatigue, reliable and convenient, Innovation for this paper is giving a solution to the difficulties of the theoretical calculation of the hollow stabilizer bar stiffness, and a set of effective fatigue life prediction method of the hollow stabilizer bar. This method provides a technical basis for product design, shortens the design and production cycle, and greatly reduces the waste of destructive testing. Introduction

Dynamic Balance Analysis of Automobile Drive Shaft Based on Solidworks

In this paper, drive shaft’s dynamic unbalance was calculated based on dynamic theory. The results were presented drive shaft’s dynamic balancing can be assessed by detecting the value of the unbalanced force at both ends of drive shaft. Here solidworks software was used to make an error modelling on the drive shaft. Simulation module is also applied to analyze the model. The results show the tube straightness, yoke thickness difference of flange yoke and symmetrical error of cardan shaft influence dynamic balance of drive shaft. The above findings have a guiding role in the practical production.

The Gap Nonlinear Characteristics of Gear Transmission System under External Excitation

For the study of nonlinear dynamic characteristics of a pair of gears in an external torque under gear meshing error excitation, we will establish two degrees of freedom nonlinear torsional vibration model. The use of Matlab / Simulink for numerical simulation solves the nonlinear dynamic model of the gear gap. Study the dynamic characteristics of the system in a certain domain of parameters on external incentive conditions, as well as external motivation of gear transmission system dynamic characteristics influence. The results have important practical value for future engineering practice on gear transmission systems dynamic design, and have important theoretical significance for complex gear transmission system dynamics study.

The Transmission System Dynamic Analysis Considering the Gear Installation Error of the Planet Gears for Ravigneaux Automatic Gearbox

At present, although the Planet Gears for Ravigneaux Automatic Gearbox is widely used, most studies focus on the automatic transmission shift rule, few for automatic transmission in the process of installation error to analyze their dynamic performance. This paper is mainly based on the blank area of the current research, focusing on analysis gear installation error to the influence of dynamic performance. This paper build 3D model by Solidworks, and use mechanical system dynamics analysis software (ADAMS) for establishing the virtual prototype of the Planet Gears for Ravigneaux Automatic Gearbox and run the dynamic simulation. Gain the speed, the gearing mesh force at various levels and the meshing frequency.