scholarly journals System-Structure Coupling Dynamic Analysis of Planetary Gears

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Haiwei Wang ◽  
Tao Zhang ◽  
Geng Liu ◽  
Liyan Wu
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Performance ◽  
System Dynamic ◽  
System Structure ◽  
Torsional Stiffness ◽  
Dynamic Loads ◽  
Planetary Gears ◽  
Structure Dynamic ◽  
Coupling Dynamic

This paper presents a novel general system-structure coupling dynamic analysis procedure to comprehensively analyze the dynamic performance of planetary gears. The novel coupling dynamic analysis takes dynamic loads of gears as excitations for structure dynamic analysis. Considering the time-varying mesh stiffness of gears, torsional stiffness of carrier and support stiffness of bearings, the system dynamic model of planetary gears is built by using lumped parameter method. Vibration modes and natural frequencies of planetary gears are investigated through modal analysis. Furthermore, system dynamic response is analyzed under various working conditions. Equations of structure dynamic analysis based on finite element method (FEM) are developed, and their solving method is put forward. Dynamic loads obtained from system dynamic analysis are forced on the ring gear to analyze its structure dynamic response. In every analysis step, if dynamic performance criteria are not satisfied, the planetary gears model should be redesigned according to dynamic analysis results.

Influence Analysis of Mortar Elastic Modulus to CRTS III Slab Track Vertical Dynamic Response

2012 ◽  
Vol 166-169 ◽  
pp. 314-317
Author(s):  
Zhi Ping Zeng ◽  
Xue Song Wang ◽  
Wen Rong Chen ◽  
Guang Cheng Long
Keyword(s):  
Elastic Modulus ◽  
Dynamic Response ◽  
Elastic System ◽  
Dynamic Performance ◽  
Beam Element ◽  
Total Potential Energy ◽  
Slab Track ◽  
Total Potential ◽  
Coupling Dynamic ◽  
Space Beam Element

A train-CRTS Ⅲ slab track coupling dynamic model was proposed to study the dynamic performance of the system. Rail was modeled as space beam element. Both slab and HGT layer were modeled as plate element respectively. The vertical and lateral connections between rail, slab, HGT layer, and subgrade were modeled as spring-damper element. The vibration matrix equation of the system was established on the basis of the principle of the total potential energy with stationary value in elastic system dynamics and the rule of “set-in-right-position” for formulating system matrices. The influence of mortar elastic modulus to CRTS Ⅲ slab track vertical dynamic response was calculated when the train runs at 350 km/h. The results show that the larger of mortar elastic modulus, the faster the vibration between rail and slab decays, and the slower the vibration between slab and HGT layer decays.

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

2012 ◽  
Vol 215-216 ◽  
pp. 1013-1016
Author(s):  
Kang Huang ◽  
Juan Zhang ◽  
Qi Chen ◽  
Guan Hua Feng
Keyword(s):  
System Dynamics ◽  
Dynamic Analysis ◽  
Mechanical System ◽  
Dynamic Simulation ◽  
3D Model ◽  
Dynamic Performance ◽  
Automatic Transmission ◽  
System Dynamic ◽  
Dynamics Analysis ◽  
Analysis Software

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.

scholarly journals Influence of Tooth Spacing Error on Gears With and Without Profile Modifications

2000 ◽  
Author(s):  
Giri Padmasolala ◽  
Hsiang H. Lin ◽  
Fred B. Oswald
Keyword(s):  
Computer Simulation ◽  
Dynamic Analysis ◽  
Dynamic Performance ◽  
Tooth Profile ◽  
Dynamic Loads ◽  
Error Pattern ◽  
Gear Dynamics ◽  
Profile Modification ◽  
Tooth Profile Modification ◽  
Small Spacing

Abstract A computer simulation was conducted to investigate the effectiveness of profile modification for reducing dynamic loads in gears with different tooth spacing errors. The simulation examined varying amplitudes of spacing error and differences in the span of teeth over which the error occurs. The modification considered included both linear and parabolic tip relief. The analysis considered spacing error that varies around most of the gear circumference (similar to a typical sinusoidal error pattern) as well as a shorter span of spacing errors that occurs on only a few teeth. The dynamic analysis was performed using a revised version of a NASA gear dynamics code, modified to add tooth spacing errors to the analysis. Results obtained from the investigation show that linear tip relief is more effective in reducing dynamic loads on gears with small spacing errors but parabolic tip relief becomes more effective as the amplitude of spacing error increases. In addition, the parabolic modification is more effective for the more severe error case where the error is spread over a longer span of teeth. The findings of this study can be used to design robust tooth profile modification for improving dynamic performance of gear sets with different tooth spacing errors.

Effect of Tooth Profile Modifications on the Dynamics of High-Contact-Ratio Gears With Different Tooth Spacing Errors

2006 ◽  
Author(s):  
Hsiang H. Lin ◽  
Jing Liu
Keyword(s):  
Computer Simulation ◽  
Dynamic Analysis ◽  
Dynamic Performance ◽  
Tooth Profile ◽  
Dynamic Loads ◽  
Contact Ratio ◽  
Gear Dynamics ◽  
Profile Modification ◽  
Tooth Profile Modification

A computer simulation was conducted to investigate the effectiveness of profile modification for reducing dynamic loads in high-contact-ratio gears with different tooth spacing errors. The simulation examined varying amplitudes of spacing error and differences in the span of teeth over which the error occurs. The modification considered included both linear and parabolic tip relief. The dynamic analysis was performed using a revised version of a NASA gear dynamics code, modified to take into consideration the tooth spacing errors in the dynamic analysis. The findings of this study can be used to design robust tooth profile modification for improving dynamic performance of high-contact-ratio gear sets with different tooth spacing errors.

A parachute recovery system dynamic analysis

1966 ◽  
Author(s):  
R. ERICKSEN ◽  
J. GUITERAS ◽  
J. LARRIVEE
Keyword(s):  
Dynamic Analysis ◽  
System Dynamic ◽  
Recovery System

scholarly journals Mobility Method Applied to Calculate the Lubrication Properties of Bearing under Dynamic Loads

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Tao He ◽  
Xiqun Lu ◽  
Jingzhi Zhu
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Systems ◽  
Journal Bearings ◽  
Numerical Results ◽  
Dynamic Loads ◽  
Analysis Program ◽  
Computational Program ◽  
Dynamically Loaded ◽  
Mobility Method ◽  
Lubrication Properties

The analytical mobility method for dynamically loaded journal bearings was presented, with the intent to include it in a general computational program, such as the dynamic analysis program, that has been developed for the dynamic analysis of general mechanical systems. An illustrative example and numerical results were presented, with the efficiency of the method being discussed in the process of their presentation.

DYNAMIC BEHAVIOR OF TELESCOPIC CRANES BOOM

2013 ◽  
Vol 13 (01) ◽  
pp. 1350010 ◽  
Author(s):  
IOANNIS G. RAFTOYIANNIS ◽  
GEORGE T. MICHALTSOS
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Constant Velocity ◽  
Steel Beam ◽  
Continuum Approach ◽  
Theoretical Formulation ◽  
Modal Superposition ◽  
Superposition Technique

Telescopic cranes are usually steel beam systems carrying a load at the tip while comprising at least one constant and one moving part. In this work, an analytical model suitable for the dynamic analysis of telescopic cranes boom is presented. The system considered herein is composed — without losing generality — of two beams. The first one is a jut-out beam on which a variable in time force is moving with constant velocity and the second one is a cantilever with length varying in time that is subjected to its self-weight and a force at the tip also changing with time. As a result, the eigenfrequencies and modal shapes of the second beam are also varying in time. The theoretical formulation is based on a continuum approach employing the modal superposition technique. Various cases of telescopic cranes boom are studied and the analytical results obtained in this work are tabulated in the form of dynamic response diagrams.

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