scholarly journals Dynamically Balanced Pointing System for CubeSats: Study and 3D Printing Manufacturing

Robotics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 121
Author(s):  
Nicholas Sesto Gorella ◽  
Matteo Caruso ◽  
Paolo Gallina ◽  
Stefano Seriani
Keyword(s):  
Planetary Gear ◽  
Gear Train ◽  
Fundamental Importance ◽  
Active Components ◽  
Single Degree Of Freedom ◽  
Satellite Attitude ◽  
Structural Parts ◽  
Complex Mechanical Systems ◽  
Train System ◽  
Selection Of

The increasing presence of additive manufacturing (AM) in the space sector prompted us to investigate the feasibility of a single degree of freedom (DoF) pointing system (PS) made by means of a compound planetary gear train system (C-PGTS) integrating a dynamic balancing system (DBS) and entirely realized in AM. We analyzed in detail the dynamics of the system dealing with the design and the realization of the prototype. Of fundamental importance for this paper is the careful selection of materials for AM suitable for the prohibitive conditions of space. The results, deriving from the comparison between the experimental part and the simulations, underline the correct dimensioning of the PS and the fundamental importance of DBS in maintaining the satellite attitude. The results also confirm the capabilities of AM in the production of complex mechanical systems, allowing high precision, combined with interesting mechanical properties and low weight.This suggests the potential of AM in the space domain, both for structural parts and active components, such as those listed in this work.

scholarly journals Dynamic analysis of planetary gear train system with double moduli and pressure angles

2018 ◽  
Vol 211 ◽  
pp. 17003
Author(s):  
Heyun Bao ◽  
Guanghu Jin ◽  
Fengxia Lu ◽  
Rupeng Zhu ◽  
Xiaozhu Zou
Keyword(s):  
Differential Equation ◽  
Integration Method ◽  
High Reliability ◽  
Planetary Gear ◽  
Gear Transmission ◽  
Gear Train ◽  
Numerical Integration Method ◽  
Planetary Gear Train ◽  
Low Weight ◽  
Train System

The planetary gear transmission with double moduli and pressure angles gearing is proposed for meeting the low weight high reliability requires. A dynamic differential equation of the NGW planetary gear train system with double and pressure angles is established. The 4-Order Runge-Kutta numerical integration method is used to solve the equations from which the result of the dynamic response is got. The dynamic load coefficients are formulated and are compared with those of the normal gear train．The double modulus planetary gear transmission is designed and manufactured. The experiment of operating and vibration are carried out and provides.

scholarly journals Selection of the optimal two-speed planetary gear train for fishing boat propulsion

2020 ◽  
Vol 48 (2) ◽  
pp. 397-403
Author(s):  
Sanjin Troha ◽  
Jelena Stefanović-Marinović ◽  
Željko Vrcan ◽  
Miloš Milovančević
Keyword(s):  
Planetary Gear ◽  
Gear Train ◽  
Planetary Gear Train ◽  
Fishing Boat ◽  
Selection Of

Research on the Load Sharing Technique and Experimental Validation of NGW Type Planetary Gear Train

2011 ◽  
Vol 86 ◽  
pp. 243-246
Author(s):  
Hai Feng Li ◽  
Bi Bo Fu ◽  
Dan Fu
Keyword(s):  
Experimental Validation ◽  
Planetary Gear ◽  
Load Sharing ◽  
Calculation Model ◽  
Gear Train ◽  
Flexible Structure ◽  
The Sun ◽  
Planetary Gear Train ◽  
Gear Modification ◽  
Selection Of

In order to solve the problem of load sharing in planetary gear train, the design of planetary gear train was described briefly in this paper. The calculation model of type NGW planetary gear train was established. By analyzing the variety of factors, such as selection of bearing clearance, gear modification, using of flexible structure and the sun gear floating design technology, several ways to improve the load sharing of the planetary gear train techniques were obtained, and they were verified by experiments finally.

Capturing Assembly Constraints of Experimental Setups in a Virtual Laboratory Environment

2012 ◽  
Author(s):  
El-Sayed Aziz ◽  
Yizhe Chang ◽  
Sven K. Esche ◽  
Constantin Chassapis
Keyword(s):  
Degrees Of Freedom ◽  
Planetary Gear ◽  
Gear Train ◽  
Virtual Laboratory ◽  
Assembly Process ◽  
Laboratory Equipment ◽  
Planetary Gear Train ◽  
Laboratory Environment ◽  
Assembly Constraints ◽  
Train System

Recently, multi-player game engines have been explored regarding their potential for implementing virtual laboratory environments for engineering and science education. In these developments, the virtual assembly process of the laboratory equipment is a critical step, and a detailed formalized description of how different components of the experimental equipment are to be joined in the assembly process is necessary. This description includes the joint types (lower and upper kinematic pairs) and the associated degrees of freedom, the resulting mobility of the assembly as well as the joint fit requirements. In this paper, a formalized representation of the assembly process that captures the information on the joint kinematics and the components’ degrees of freedom generated when assembling laboratory equipment in a virtual laboratory environment will be discussed. A planetary gear train system will be used as an example to illustrate the proposed method. In particular, the structure of the assembly of a planetary gear train system involves assembly constraints between a group of components (sun, planet and ring gears, shafts, planet carrier assembly, etc.) that generate the desired relationship between the input and output motions. This paper will identify important requirements for modeling different configurations of planetary gear train assemblies within a game-based virtual laboratory environment. These requirements include the positioning and the orienting of the components, the verification of the kinematic joints, the propagation of the mating constraints and the capturing of the joint attributes.

A Simple Method for Gear Ratio and Torque Analysis of Planetary Train Systems

1998 ◽  
Author(s):  
Yi Zhang ◽  
Zhi Wu
Keyword(s):  
Degrees Of Freedom ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Gear Train ◽  
Simple Method ◽  
Clutch Engagement ◽  
Torque Analysis ◽  
Train System ◽  
Multiple Transmission

Abstract Planetary gear train systems are widely used in automotive transmissions due to their compactness, large reduction ratios and degrees of freedom available for the selection of gear ratios. The analysis of gear ratios and torque relations among the elements of a planetary train system is often difficult due to the complexity of the planetary train structure. This is especially the case for automotive transmissions using planetary train system where the members for input and output and the members that are fixed or interconnected must be changed in the clutch engagement schedule to obtain multiple transmission speeds. This paper proposes a systematic approach that simplifies the gear ratio and torque analysis based on the basic planetary train characteristics. The approach can be effectively used for the analysis of gear ratio and static torques for power transmissions consisting of parallel planetary trains. A case study of multi-speed automotive transmission based on the approach is included in the paper.

Research on Dynamic Characteristic of Planetary Gear Train by Visualization Technology

2011 ◽  
Vol 308-310 ◽  
pp. 307-310
Author(s):  
Xiao Mei You ◽  
Lei Meng ◽  
Xing Guo Ma ◽  
Bang Chun Wen
Keyword(s):  
Dynamic Characteristic ◽  
Planetary Gear ◽  
Gear System ◽  
Gear Train ◽  
Design Stage ◽  
Planetary Gear Train ◽  
Body Dynamics ◽  
Visualization Technology ◽  
Multi Body ◽  
Train System

Based on the multi-body dynamics theory and visualization technology, a planetary gear train system is studied in RecurDyn. The multi-body dynamics model of the 2K-H planetary gear train system is built to do the visual analysis on dynamic characteristic of the planetary gear system severally in the ideal steady-state condition and the random-load condition, than the real-time dynamic contact stress and some other meaningful results of the key components are gained. Compared the related simulation results with that of the theoretical analysis, it is known that two kinds of results are consistent and the simulation analysis on the planetary gear train system is correct and accuracy. From the research above, the new idea and analytical tool are provided for the traditional, static, "redundancy" design method of the gear system, and also the effective technical mean is provided in conceptual design of complex mechanical products to predict the performance, then to reduce the "birth defects" in design stage and also an effective and efficient technical means for engineering applications is offered for optimal design and developing new product on gear train system.

Detection of Degenerate Structure in Single Degree-of-Freedom Planetary Gear Trains

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Vinjamuri Venkata Kamesh ◽  
Kuchibhotla Mallikarjuna Rao ◽  
Annambhotla Balaji Srinivasa Rao
Keyword(s):  
Graph Theory ◽  
Planetary Gear ◽  
Degree Of Freedom ◽  
Gear Train ◽  
Structural Synthesis ◽  
Drastic Reduction ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Planetary Gear Trains ◽  
Gear Trains

Graph theory is a powerful tool in structural synthesis and analysis of planetary gear trains (PGTs). In this paper, a new algorithm has been developed for detecting degenerate structure in planetary gear trains. The proposed algorithm is based on the concept of fundamental circuits' rotation graphs. Detection of degeneracy is entirely based on finding one key element. The key element or link that makes planetary gear train into two groups is found in this work. The main advantage of the proposed method lies in the drastic reduction in the required combinatorial analysis compared to other methods available.

Kinematic Design and Analysis of Coupled Planetary Bevel-Gear Trains

1983 ◽  
Vol 105 (3) ◽  
pp. 441-444 ◽  
Author(s):  
C. P. Day ◽  
H. A. Akeel ◽  
L. J. Gutkowski
Keyword(s):  
Graphical Method ◽  
Planetary Gear ◽  
Bevel Gear ◽  
Gear Train ◽  
Machine Design ◽  
Matrix Formulation ◽  
Bevel Gears ◽  
Planetary Gear Trains ◽  
Gear Trains ◽  
Train System

One of the most common methods in analyzing speed ratios of planetary gear trains has been the tabulation method. For complex mechanisms where many gear trains are coupled together, this method becomes inconvenient. With bevel gears in the gear train, it fails to apply. Some textbooks also use formulas which apply only to gears with parallel axes of rotation. This fact is often not stated in machine design texts. These methods can become incorrectly used in the design and analysis of planetary bevel gear trains with nonparallel axes of rotation. With the use of computers and graphics, a convenient and reliable method can be derived. Freudenstein and Yang have derived the early graphical method for analyzing gear trains. This paper describes an algorithm to extend the graphical method for analyzing coupled planetary bevel gear trains. A matrix formulation is used to include speeds of all gears rotating about their respective axes. Such formulation will aid designers and analysts in determining correct speed ratios of all gears in a planetary gear train system.

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