Dynamic characteristics analysis and experimental research on a new type planetary gear apparatus with small tooth number difference

2013 ◽  
Vol 27 (5) ◽  
pp. 1233-1244 ◽  
Author(s):  
Chao Huang ◽  
Jia-Xu Wang ◽  
Ke Xiao ◽  
Min Li ◽  
Jun-Yang Li
Keyword(s):  
Experimental Research ◽  
Dynamic Characteristics ◽  
Planetary Gear ◽  
Small Tooth ◽  
Characteristics Analysis ◽  
Tooth Number ◽  
New Type ◽  
Dynamic Characteristics Analysis

Dynamic Characteristics Analysis of Cable-Rib Tension Deployable Antenna

2016 ◽  
Author(s):  
Liu Ruiwei ◽  
Hongwei Guo ◽  
Zhang Qinghua ◽  
Rongqiang Liu ◽  
Tang Dewei
Keyword(s):  
Dynamic Characteristics ◽  
Structural Parameters ◽  
Element Model ◽  
Structure Design ◽  
Antenna Structure ◽  
Characteristics Analysis ◽  
New Type ◽  
Dynamic Characteristics Analysis ◽  
The Finite Element Model ◽  
Weight Dynamic

Balancing stiffness and weight is of substantial importance for antenna structure design. Conventional fold-rib antennas need sufficient weight to meet stiffness requirements. To address this issue, this paper proposes a new type of cable-rib tension deployable antenna that consists of six radial rib deployment mechanisms, numerous tensioned cables, and a mesh reflective surface. The primary innovation of this study is the application of numerous tensioned cables instead of metal materials to enhance the stiffness of the entire antenna while ensuring relatively less weight. Dynamic characteristics were analyzed to optimize the weight and stiffness of the antenna with the finite element model by subspace method. The first six orders of natural frequencies and corresponding vibration modes of the antenna structure are obtained. In addition, the effects of structural parameters on natural frequency are studied, and a method to improve the rigidity of the deployable antenna structure is proposed.

Small Tooth Number Difference Planetary Gear Drive with a Crank and Oscillating Block Inputting Mechanism

2011 ◽  
Vol 52-54 ◽  
pp. 1268-1273 ◽  
Author(s):  
Jian Kun Cui
Keyword(s):  
Potential Application ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Gear Pair ◽  
Gear Drive ◽  
Small Tooth ◽  
Tooth Number ◽  
New Type ◽  
Internal Gear ◽  
Block Mechanism

A new mechanism construction for small tooth number difference planetary gear drive is developed in which the planet wheel is guided by a planar crank and oscillating block mechanism. The sizes of linkage are design dexterously to get an approximate circumference linkage curve so that the engaging condition of internal gear pair can be satisfied. The trajectory of the inner gear center motion is analyzed and its error comparing with a standard circle is calculated to avoid movement interference. The movement of inner gear is study particularly to deduced formula of instantaneous transmission ratio. Despite observable fluctuation of output speed, this new type of gear transmission mechanism still has potential application value in situation with large ratio and low input speed. A hand drive winch prototype using the mechanism is also illustrated in this paper.

Design of New Type Involute Planetary Gear Reducer of Small Tooth Number Difference

2012 ◽  
Vol 490-495 ◽  
pp. 2076-2080
Author(s):  
Hui Zhang
Keyword(s):  
Planetary Gear ◽  
Input Frequency ◽  
Closed Graph ◽  
Small Tooth ◽  
Inherent Frequency ◽  
Tooth Number ◽  
New Type ◽  
The Common ◽  
Internal Gear ◽  
Ansys Workbench

Based on the analysis of the common NN-type involute planetary gear reducer with small tooth number difference, this paper replaced the traditional eccentric axle sleeve with double eccentric crankshaft, so as to simplify the structure of involute planetary gear reducer with small tooth number difference; and then used closed graph to select the modification coefficients of the internal gear pairs thereby accomplishing the design of the new type reducer; Finally, used ANSYS Workbench software to analyze the modal of 3D virtual prototype, and arrived at a realized conclusion :the inherent frequency of the system is much higher than the input frequency, so resonance will not occur.

scholarly journals Dynamic characteristics analysis for a new-type maglev vehicle

2017 ◽  
Vol 9 (12) ◽  
pp. 168781401774541 ◽  
Author(s):  
Keren Wang ◽  
Shihui Luo ◽  
Weihua Ma ◽  
Xiaohao Chen
Keyword(s):  
Dynamic Characteristics ◽  
Maglev Vehicle ◽  
Characteristics Analysis ◽  
New Type ◽  
Dynamic Characteristics Analysis

Innovation design and experiment research on the N–N type planetary gear apparatus with small tooth number difference

2016 ◽  
Vol 230 (15) ◽  
pp. 2699-2708 ◽  
Author(s):  
Wei Pu ◽  
Jiaxu Wang ◽  
Yuefeng Xin ◽  
Junyang Li ◽  
Guangwu Zhou ◽  
...  
Keyword(s):  
Side Effect ◽  
High Performance ◽  
Experimental Testing ◽  
Planetary Gear ◽  
Root Cause ◽  
Small Tooth ◽  
Tooth Number ◽  
New Type ◽  
Long Life ◽  
Harmful Side Effect

The three high-performance indicators (low retrace tolerance, long life and low vibration) of N–N type planetary gear apparatus with small tooth number difference (abbrev “N–N–PGA”) are hardly achieved simultaneously until recently. At present, the root cause analysis (RCA) and TRIZ are considered to be comprehensive and systematic new theories for technological innovation, which provides a new way to figure out the conundrum existed in the N–N–PGA. In the present study, the “root cause” of the problem is proposed with the RCA approach and two contradictions existed in the N–N–PGA have been revealed: Harmful side effect and stability of composition; harmful side effect and durability of a moving object. Besides, two reasonable principles (“Dynamicity” and “Composite materials”) for the N–N–PGA design recommended by the TRIZ method are used to eliminate these contradictions. In addition, a prototype of the obtained new type N–N–PGA design is developed for experimental testing. The obtained result demonstrates the capability of the above method for obtaining low retrace tolerance, long life, and low vibration.

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