High performance two degrees of freedom attitude control for solar sails

2011 ◽  
Vol 48 (11) ◽  
pp. 1869-1879 ◽  
Author(s):  
Daniele Romagnoli ◽  
Thimo Oehlschlägel
Keyword(s):  
Attitude Control ◽  
High Performance ◽  
Degrees Of Freedom ◽  
Solar Sails ◽  
Two Degrees Of Freedom

Implementation of Particular Models of Innovative Servomechanisms

2013 ◽  
Vol 389 ◽  
pp. 415-420
Author(s):  
Davide Moscatelli
Keyword(s):  
High Performance ◽  
Degrees Of Freedom ◽  
Positioning Precision ◽  
Two Degrees Of Freedom ◽  
Model Based ◽  
High Dynamic ◽  
Model Based Analysis

This paper describes a model based analysis of a differential planar servomechanism (two degrees of freedom); this system is meant to achieve high performance as regards the positioning precision (meant as both repeatability and accuracy) keeping a relative high dynamic.

Type Synthesis of Two Degrees-of-Freedom Rotational Parallel Mechanisms With a Fixed Center-of-Rotation Based on a Graphic Approach

2012 ◽  
Author(s):  
K. Wu ◽  
J. J. Yu ◽  
S. Z. Li ◽  
G. H. Zong ◽  
Xianwen Kong
Keyword(s):  
High Performance ◽  
Degrees Of Freedom ◽  
Parallel Mechanisms ◽  
Type Synthesis ◽  
Two Degrees Of Freedom ◽  
Center Of Rotation ◽  
Parasitic Motion ◽  
Performance Requirements ◽  
Rotary Stage ◽  
Fixed Center

Mechanisms usually have to be particularly designed to meet the high-performance requirements in terms of different applications. For instance, Two degrees of freedom (DOF) rotational parallel mechanisms (RPMs) with a fixed center-of-rotation can eliminate parasitic motion and could provide the rotary stage with excellent dynamic stability, good controllability and easy operation. Therefore, this paper mainly aims at synthesizing 2-DOF RPMs with fixed center-of-rotation, a class of special RPMs with potential excellent performances. A graphic approach based on freedom and constraint spaces is introduced firstly. The constraint spaces of a class of the existing 2-DOF RPMs are illustrated, and the corresponding type synthesis patterns are summarized by comparing the geometric properties of those spaces with the mechanism characteristic. After fully decomposing the four-dimensional constraint space into sub-constraint spaces, a general type synthesis procedure is proposed based on the freedom and constraint topology. Two novel 2-DOF RPMs with fixed center-of-rotation are constructed based on the proposed method and procedure. The proposed graphic approach proves to be effective and simple to synthesizing those parallel mechanisms with some special performance.

Experimental Verification of Linear and Adaptive Control Techniques for a Two Degrees-of-Freedom Helicopter

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Pavan Nuthi ◽  
Kamesh Subbarao
Keyword(s):  
Flight Control ◽  
High Performance ◽  
Degrees Of Freedom ◽  
Reference Model ◽  
Design Procedure ◽  
Linear Quadratic ◽  
Two Degrees Of Freedom ◽  
Test And Evaluation ◽  
Modeling Uncertainties ◽  
Model Tuning

This paper presents the design procedure and experimental results of a high performance adaptive augmentation technique applied to a controller derived based on linear quadratic methods. The Quanser two degrees-of-freedom (2DOF) helicopter was chosen as the experimental platform on which these controllers were implemented. The paper studies the implementation of each of these controllers standalone as well as in the augmented scheme, and discusses its performance and robustness for cases with parametric uncertainties, and unmodeled dynamics. An attempt is made to combine linear quadratic tracker's reliability with the adaptive augmentation's robustness toward modeling uncertainties. It is found that appropriate tuning of parameters in the adaptive framework is key to its performance and thus the process of choosing the parameters is elaborated along with guidelines for choosing a reference model. Tuning considerations for controller implementation on the experimental setup as compared to the same on the numerical model are also addressed. The experiments performed on this system serve as a suitable research test and evaluation basis for robotics and flight control applications.

The scientific bases of autocontrol with vibration phase for a resonance beating-vibration system with two degrees of freedom driven by debalances

1996 ◽  
Vol 18 (2) ◽  
pp. 43-48
Author(s):  
Tran Van Tuan ◽  
Do Sanh ◽  
Luu Duc Thach
Keyword(s):  
Degrees Of Freedom ◽  
Regulation System ◽  
Vibration System ◽  
Two Degrees Of Freedom ◽  
System Operating

In the paper it is introduced a method for studying dynamics of beating-vibrators by means of digital calculation with the help of the machine in accordance with the needs by the helps of an available auto regulation system operating with high reability.

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