scholarly journals Three-Dimensional Modeling and Structured Vibration Modes of Two-Stage Helical Planetary Gears Used in Cranes

2017 ◽  
Vol 2017 ◽  
pp. 1-18 ◽  
Author(s):  
Lina Zhang ◽  
Yong Wang ◽  
Kai Wu ◽  
Ruoyu Sheng
Keyword(s):  
Three Dimensional ◽  
Structure Design ◽  
Parameter Method ◽  
Vibration Modes ◽  
Two Stage ◽  
Planetary Gears ◽  
Three Dimensional Modeling ◽  
Translational Mode ◽  
Gyroscopic Effects ◽  
Two Stages

The dynamic investigation of helical planetary gears plays an important role in structure design as the vibration and noise are perceived negatively to the transmission quality. With consideration of the axial deformations of members, the gyroscopic effects, the time-variant meshing stiffness, and the coupling amongst stages, a three-dimensional dynamic model of the two-stage helical planetary gears is established by using of the lumped-parameter method in this paper. The model is applicable to variant number of planets in two stages, different planet phasing, and spacing configurations. Numerical simulation is conducted to detect the structured vibration modes of the equally spaced systems. Furthermore, the unique properties of these vibration modes are mathematically proved. Results show that the vibration modes of the two-stage helical planetary gears can be categorized as five classes: the rigid body mode, the axial translational-rotational mode, the radical translational mode, and the 1st-stage and the 2nd-stage planet mode.

Analytical Characterization of the Unique Properties of Planetary Gear Free Vibration

1999 ◽  
Vol 121 (3) ◽  
pp. 316-321 ◽  
Author(s):  
Jian Lin ◽  
R. G. Parker
Keyword(s):  
Degrees Of Freedom ◽  
Eigenvalue Problems ◽  
Linear Time ◽  
Planetary Gear ◽  
Vibration Modes ◽  
Planetary Gears ◽  
Factors Affecting ◽  
Linear Time Invariant ◽  
Gyroscopic Effects ◽  
Time Invariant

This work develops an analytical model of planetary gears and uses it to investigate their natural frequencies and vibration modes. The model admits three planar degrees of freedom for each of the sun, ring, carrier and planets. It includes key factors affecting planetary gear vibration such as gyroscopic effects and time-varying stiffness. For the linear, time-invariant case, examination of the associated eigenvalue problem reveals the well-defined structure of the vibration modes, where the special structure results from the cyclic symmetry of planetary gears. Vibration modes are classified into rotational, translational and planet modes. The unique characteristics of each type of mode are analytically investigated in detail. For each class of mode, reduced-order eigenvalue problems are derived.

Analysis of Modal Properties of Spur Planetary Gears

2013 ◽  
Vol 300-301 ◽  
pp. 978-981
Author(s):  
Jun Gang Wang ◽  
Yong Wang ◽  
Zhi Pu Huo
Keyword(s):  
Radial Direction ◽  
Natural Frequencies ◽  
Planetary Gear ◽  
Vibration Modes ◽  
Rotational Mode ◽  
Planetary Gears ◽  
Translational Mode ◽  
Coupling Dynamic ◽  
Rotational Coupling ◽  
Coupling Dynamic Model

A translational-rotational-coupling dynamic model has been built in the carrier-attached coordinate system.Differential equations of the system have been derived, and the natural frequencies and vibration modes of the planetary gear set have been obtained through solution of the associated eigenvalue problem. Based on the properties of the transmission system, the vibration modes of 2K-H spur planetary gear set can be classified into three categories, i.e., translational mode along radial direction, rotational mode, and planet mode.

Dynamic Modeling of Multi-Stage Planetary Gears Coupled with Bearings in Housing

2011 ◽  
Vol 86 ◽  
pp. 30-34
Author(s):  
Zheng Ming Xiao ◽  
Da Tong Qin
Keyword(s):  
Planetary Gear ◽  
Degree Of Freedom ◽  
Design Parameters ◽  
Parameter Method ◽  
Rotational Degree ◽  
Planetary Gears ◽  
Multi Stage ◽  
Lumped Parameter ◽  
Shield Tunnelling ◽  
Gyroscopic Effects

This work develops an analytical model of multi-stages planetary gear transmission (PGT) coupled with bearings in housing based on analyzing the displacement relationships of gearing system. The model adopts three planar degree-of-freedom for each of the central components, and the rotational degree-of-freedom for the planets of each stage. Considering the gyroscopic effects, the modified transverse-torsional model is established in the rotating Cartesian coordinates by lumped-parameter method, which is more accurate and may match with the physical model better than the purely torsional model. According to the design parameters of the 3-stage planetary gears of main reducer of shield tunnelling machine, the natural frequencies and vibration modes are investigated by using this transverse-torsional model.

Design and Dynamic Simulation Research of a Bionic Three-Link Tube Shock Absorber

2020 ◽  
Vol 13 ◽  
Author(s):  
Yong Song ◽  
Yue Li ◽  
Zhanlong Li ◽  
Jinyi Lian ◽  
Qinglu Shi ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Shock Absorber ◽  
Ride Comfort ◽  
Three Dimensional ◽  
Structure Design ◽  
The Body ◽  
Three Dimensional Modeling ◽  
Shock Absorbers ◽  
Link Mechanism ◽  
Vehicle Suspension System

Background:: Shock absorbers are the main damping component of vehicle suspension system, whose excellent passive characteristics can greatly improve and guarantee the ride comfort and handling stability of vehicles. Therefore, it is of great significance to research and develop a shock absorber with excellent passive characteristics. Objective:: The purpose of this paper is to propose and design a bionic three-link tube shock absorber with good buffering and vibration reduction performance and bionic adaptive characteristics. In addition, the passive characteristics of the purposed shock absorber are studied. Methods:: The bionics idea is applied to the development of vehicle shock absorbers. A three-link mechanism with dampers and springs is abstracted and designed according to the structure and the function of kangaroo legs. A bionic three-link tube shock absorber is constructed based on the traditional tube shock absorber structures and the three-link mechanism. Three-dimensional modeling and three-dimensional dynamic simulation of the shock absorber are carried out by CATIA and ADAMS. Results:: The body acceleration are greatly reduced relative to excitations; the dynamic displacement decreases sharply under greater excitation, but there is slight increase under smaller excitation; the motion function and joint change characteristics of the proposed shock absorber are similar to those of kangaroo legs to a certain degree. Conclusion:: The results show that the structure design of the bionic three-link tube shock absorber is reasonable and workable, the shock absorber presents good buffering and damping performance and some bionic adaptive characteristics, however, there is still room for further optimization of the structure design.

Vibration Properties of High-Speed Planetary Gears With Gyroscopic Effects

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Christopher G. Cooley ◽  
Robert G. Parker
Keyword(s):  
High Speed ◽  
Eigenvalue Problems ◽  
Planetary Gear ◽  
Vibration Modes ◽  
Planetary Gears ◽  
High Speeds ◽  
Wide Range ◽  
Modal Property ◽  
Gyroscopic Effects ◽  
Complex Valued

This study investigates the modal property structure of high-speed planetary gears with gyroscopic effects. The vibration modes of these systems are complex-valued and speed-dependent. Equally-spaced and diametrically-opposed planet spacing are considered. Three mode types exist, and these are classified as planet, rotational, and translational modes. The properties of each mode type and that these three types are the only possible types are mathematically proven. Reduced eigenvalue problems are determined for each mode type. The eigenvalues for an example high-speed planetary gear are determined over a wide range of carrier speeds. Divergence and flutter instabilities are observed at extremely high speeds.

Finite Element Analysis and Structure Design for Chassis of Aircraft Towbarless Tractor

2011 ◽  
Vol 328-330 ◽  
pp. 690-694
Author(s):  
Zhi Wei Xing ◽  
Yong Lv ◽  
Jun Hui Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Structure Design ◽  
The Body ◽  
Element Analysis ◽  
Future Design ◽  
Ground Support ◽  
Three Dimensional Modeling ◽  
Entire Vehicle

Aircraft tow-tractor is one of the absolutely necessary ground support equipments (GSE) in the airport. The chassis is the framework on which the body and working parts of the tow-tractor, what plays a significant role in a entire vehicle design. The endurance and rigidity of the chassis have a direct influence on the reliability and practicability. In this paper, a simplified model is established for the carriage of aircraft towbarless tractor on the three-dimensional modeling platform--Proe5.0, and then mechanical finite element analysis are proceeding by Ansys12.0. The results show that the chassis model is of a appropriate structure and the design coincides with actual requirements, the Stress Concentration at the joint between carriage and wheel-grip mechanism has been reduced substantially. All trial results have laid a foundation for future design of the entire tractor.

Design of Body Structure for New Type Lightweight Electric Vehicle

2014 ◽  
Vol 620 ◽  
pp. 335-340 ◽  
Author(s):  
Li Xia Wang ◽  
Tian Feng Zhao ◽  
Jian Bo Cao ◽  
Ji Feng Shen ◽  
Yan Bin Xiao ◽  
...  
Keyword(s):  
Energy Saving ◽  
Electric Vehicle ◽  
Three Dimensional ◽  
Structure Design ◽  
The Body ◽  
Vehicle Body ◽  
Body Structure ◽  
Three Dimensional Modeling ◽  
Body Design ◽  
New Type

Considering the efficient use of energy and environmental pollution, people's lives tend to energy saving and environmental protection, and energy saving electric vehicles has gradually been widely used. Through combining theoretical analysis, numerical simulation, system design and experimental validation, based on studying electric vehicle body design principles, the experiment optimized electric vehicle body design, and reduced the weight of the vehicle effectively. Its performance becomes more advanced, and the application becomes more economical and safe. By using Solidworks software, lightweight electric vehicle body structure of two-dimensional design and three-dimensional modeling was built to reach practical requirements. The body structure design is original and simple, which has good practical value.

A Study on Three-Dimensional Modeling Method in Product Design Process Based on Pro/E

2013 ◽  
Vol 664 ◽  
pp. 1180-1185
Author(s):  
Jian Qi Zhang ◽  
Zhi Gang Liu ◽  
Fei Ming Cheng
Keyword(s):  
Product Design ◽  
High Efficiency ◽  
Design Method ◽  
Three Dimensional ◽  
Structure Design ◽  
Product Modeling ◽  
Existing Problems ◽  
Three Dimensional Modeling ◽  
Product Design Process ◽  
Low Efficiency

Aiming at the existing problems in the process of product modeling and structure design such as of no visualized appearance, low efficiency and the easy interference of parts, a Pro/E-based product design method is proposed which, in the component pattern, conducts three-dimensional design by considering core component as reference and creates the rest parts according to modeling surface. This method effectively prevents the easy interference of parts during the process of product design, ensures the precise alignment among parts and avoids design repetition, thus greatly improves the design efficiency. Its application in the process of intelligent data acquisition terminal product design has proved the high efficiency and practicality of this design method.

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