An Integrated Systems Approach for Design of Aerospace Structures

1988 ◽  
Vol 3 (2) ◽  
pp. 118-129
Author(s):  
K.K. Gupta
Keyword(s):  
Large Scale ◽  
Systems Approach ◽  
General Purpose ◽  
Aerospace Engineering ◽  
Integrated Systems ◽  
Structural Systems ◽  
Control Engineering ◽  
Analysis And Design ◽  
Dynamics And Control ◽  
And Control

This paper is primarily concerned with the analysis and design of structural systems relating to aeronautical and aerospace engineering. Some numerical formulations are presented that deal with the synthesis of these systems integrating such disciplines as structures, unsteady aero-dynamics and control engineering. A general-purpose finite element computer program developed for associated large-scale computations is also described in some detail. Finally, results of relevant numerical analyses pertaining to some representative aircraft and spacecraft, obtained by utilizing the program, are presented that testify to the efficacy of the currently developed solution procedures.

Deployment dynamics and control of large-scale flexible solar array system with deployable mast

2016 ◽  
Vol 58 (7) ◽  
pp. 1288-1302 ◽  
Author(s):  
Hai-Quan Li ◽  
Xiao-Feng Liu ◽  
Shao-Jing Guo ◽  
Guo-Ping Cai
Keyword(s):  
Large Scale ◽  
Solar Array ◽  
Dynamics And Control ◽  
Deployment Dynamics ◽  
And Control

Automated Dynamic Analysis of Chain-Driven Mechanical Systems

1983 ◽  
Vol 105 (3) ◽  
pp. 362-370 ◽  
Author(s):  
Ting W. Lee
Keyword(s):  
Dynamic Analysis ◽  
Large Scale ◽  
Equations Of Motion ◽  
Dynamic Effect ◽  
General Purpose ◽  
Displacement Function ◽  
Analysis And Design ◽  
Driven System ◽  
Chain Dynamic ◽  
System Equations

A general approach to analyze the dynamics of chain-driven systems subjected to transient loads is developed and applied. The method suitable for many automated dynamic analysis techniques involves the simulation of the dynamic effect of chain by a displacement function and the introduction of this function as a kinematic constraint to couple with the system equations of motion. A general purpose dynamic analysis algorithm, the DADS code (Dynamic Analysis and Design Systems), is then employed to generate the set of system equations and to provide a computer-aided dynamic analysis of the overall chain-driven system. Two ways of formulating the chain displacement functions are described. One provides the displacement of the chain based on the pitch circles of chain sprockets; the other includes a consideration of the polygonal effect of the chain which contributes essentially to the dynamics of the chain. The latter involves the use of the principle of kinematic equivalency, i.e., modeling the chain dynamic effect by a four-bar linkage. Using the proposed displacement function, the kinematic motion of the chain can be taken into account. This procedure, therefore, makes the system adaptable to conventional dynamic analysis code in which the chain is usually not included as one of the standard elements. Moreover, pulsation and dynamic load of the chain as well as the system dynamic response due to chain effect may be estimated. A typical large-scale chain-driven system which is an externally powered machine gun is investigated to illustrate the potential usefulness of the approach.

Stability and Control of Large-Scale Dynamical Systems

2011 ◽  
Author(s):  
Wassim M. Haddad ◽  
Sergey G. Nersesov
Keyword(s):  
Dynamical Systems ◽  
Decentralized Control ◽  
Finite Time ◽  
Large Scale ◽  
Synthesis Methods ◽  
Network Systems ◽  
Finite Time Stability ◽  
Analysis And Design ◽  
And Control ◽  
Interconnected Dynamical Systems

Modern complex large-scale dynamical systems exist in virtually every aspect of science and engineering, and are associated with a wide variety of physical, technological, environmental, and social phenomena, including aerospace, power, communications, and network systems, to name just a few. This book develops a general stability analysis and control design framework for nonlinear large-scale interconnected dynamical systems, and presents the most complete treatment on vector Lyapunov function methods, vector dissipativity theory, and decentralized control architectures. Large-scale dynamical systems are strongly interconnected and consist of interacting subsystems exchanging matter, energy, or information with the environment. The sheer size, or dimensionality, of these systems necessitates decentralized analysis and control system synthesis methods for their analysis and design. Written in a theorem-proof format with examples to illustrate new concepts, this book addresses continuous-time, discrete-time, and hybrid large-scale systems. It develops finite-time stability and finite-time decentralized stabilization, thermodynamic modeling, maximum entropy control, and energy-based decentralized control. This book will interest applied mathematicians, dynamical systems theorists, control theorists, and engineers, and anyone seeking a fundamental and comprehensive understanding of large-scale interconnected dynamical systems and control.

Technology and Decision Making: Some Aspects of the Development of OGAS

Slavic Review ◽  
1980 ◽  
Vol 39 (3) ◽  
pp. 426-445 ◽  
Author(s):  
William J. Conyngham
Keyword(s):  
Decision Making ◽  
Socioeconomic Development ◽  
Large Scale ◽  
Systems Approach ◽  
Rapid Expansion ◽  
Technical Program ◽  
Economic Management ◽  
The Past ◽  
Scientific Technical ◽  
And Control

During the past decade, the most important large-scale effort to expand the decision-making and control capabilities of the Soviet economic management system has been the scientific-technical program for creating an integrated nationwide management information system. Formally designated as the Obshchegosudarstvennaia sistema sbora i obrabotki informatsii (dannykh) dlia ncheta, planirovaniia i upravleniia narodnym khosiaistvom (All-State System for the Collection and Processing of Information for Reporting, Planning, and Management of the National Economy), the system is more happily described by its acronym OGAS.1 It is an outgrowth of the rapid expansion of the systems approach (particularly its cybernetic expression) to the rationalization of management, and has developed into the technological variant of reform and an evident alternative and successor to the ill-fated economic reforms of 1965. As a system, OGAS has been projected as a solution to many of the fundamental economic, social, and organizational problems resulting from Soviet socioeconomic development.

scholarly journals State-level needs for social distancing and contact tracing to contain COVID-19 in the United States 

2020 ◽  
Author(s):  
Weihsueh A. Chiu ◽  
Rebecca Fischer ◽  
Martial L. Ndeffo-Mbah
Keyword(s):  
Large Scale ◽  
District Of Columbia ◽  
State Level ◽  
The United States ◽  
Contact Tracing ◽  
Social Distancing ◽  
Epidemic Curve ◽  
Dynamics And Control ◽  
And Control ◽  
The Impact

Abstract Starting in mid-May 2020, many US states began relaxing social distancing measures that were put in place to mitigate the spread of COVID-19. To evaluate the impact of relaxation of restrictions on COVID-19 dynamics and control, we developed a transmission dynamic model and calibrated it to US state-level COVID-19 cases and deaths. We used this model to evaluate the impact of social distancing, testing and contact tracing on the COVID-19 epidemic in each state. As of July 22, 2020, we found only three states were on track to curtail their epidemic curve. Thirty-nine states and the District of Columbia may have to double their testing and/or tracing rates and/or rolling back reopening by 25%, while eight states require an even greater measure of combined testing, tracing, and distancing. Increased testing and contact tracing capacity is paramount for mitigating the recent large-scale increases in U.S. cases and deaths.

Sign in / Sign up

Export Citation Format

Share Document