Digital control system for space structural dampers

annual report, grant no. NAG-1-349

Publisher: Dept. of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Publisher: National Aeronautics and Space Administration, Langley Research Center in Charlottesville, Va, Hampton, Va

Written in English
Published: Downloads: 524
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Subjects:

  • Actuators.,
  • Digital control systems.

Edition Notes

Statementsubmitted by J.K. Haviland.
SeriesNASA contractor report -- NASA CR-173867.
ContributionsLangley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15394274M

In state-determined systems, the state variables may always be taken as the outputs of integrator blocks. A system of order nhas nintegrators in its block diagram. The derivatives of the state variables are the inputs to the integrator blocks, and each state. Air Door Actuator Climate Control Damper Servo Damper assembly for Lexus GS GS GS IS RX, for Lexus # SC out of 5 stars 3 $ $ Optimal Control of Structural Dampers Shibabrat Naik, Nicholas Sharp, Shane Ross Abstract—Deformation due to wind is a significant obstacle in the design of tall buildings. Many large buildings include dampers in their upper floors to counteract oscillation due to wind, and recent designs permit controlling the damping properties of these. Trajectory based control uses information from phase space and optimal sets to reach or move a solution subset. For our interests, objective is to reduce inhabitant discomfort by reducing excessive sway in top oors and adverse structural stresses. Naik, Sharp, Ross (ESM, VT) Control of dampers .

Self-powered and sensing control system based on MR damper: presentation and application Zhihao Wanga,b, Zhengqing Chen*a, Billie F. Spencer, Jr.b aWind Engineering Research Center, Hunan University, Changsha, China, bDept. of Civil & Environmental Eng., Univ. of Illinois at Urbana-Champaign, IL, USA, ABSTRACT A new self-powered and sensing semi-active control system . Designed specifically for HVAC, building maintenance, and controls technicians, HVAC Control Systems 4th Edition is the perfect source of information in the HVAC field. This guide gives you an amazingly detailed in-depth look into the explanation of all things HVAC including the newest standards, techniques, and tips of the trade.   Today, most new control systems are DDC (direct digital control) systems. However, you need to understand pneumatic controls because you will encounter many, many existing pneumatic systems. (Note: DDC systems will be discussed in an upcoming article.) A pneumatic control system must have a clean, dry, reliable compressed air source. Now in it's newly updated third edition, this handbook was written to serve as a complete and concise reference for those engaged in the operation and maintenance of automatic control systems serving building heating, ventilating and air conditioning systems. The full range of topics pertinent to the effective operation of all types of HVAC control systems currently in use today are explored.

digital control Conclusion Modelling, analysis and control of linear systems using state space representations Olivier Sename Grenoble INP / GIPSA-lab February State space approach Some interesting books: I K.J. Astrom and B. Wittenmark, Computer-Controlled Systems. Robustness of digital control systems 14 Building blocks of linear systems Brief introduction to operational amplifiers Building blocks for time-continuous systems A sample digital control system with microcontroller Building blocks for time-discrete systems and digital controllers control of standard York rooftop units. The YCCS features advanced Direct Digital Control (DDC) controllers bundled with York commercial equipment, actuators, sensors, and damper assemblies. YCCS applications include single zone, Change-Over Bypass (COBP), and Variable Air Volume (VAV) zoning systems. The innovative control algorithms provide. A new strategy for structural control systems using viscous dampers is proposed. When we use some energy absorption devices, such as viscous dampers, in a building structure, the devices are uniformly distributed over the building so that the input energy should not concentrate in a specific story.

Digital control system for space structural dampers Download PDF EPUB FB2

"Digital control systems for space structural dampers, also referred to as inertia or proof-mass dampers are investigated. A damper concept is improved by adding a small taper to the proof-mass, and using a proximeter to determine position.

Another damper using a three inch stroke rather than the standard one inch stroke is described. Get this from a library. Digital control system for space structure dampers: annual report, grant no. NAG [J K Haviland; United States.

National Aeronautics and Space Administration.]. As individual zone dampers open and close, the system static pressure will rise and fall. In order to maintain proper airflow and static pressure through the HVAC system, a bypass system incorporating a floating type motorized damper and a static pressure control should be used.

The static pressure control is equipped with solid-state switching and. However, structural engineers often lack the tools for the optimal selection and placement of such systems.

In Building Control with Passive Dampers, Takewaki brings together most the reliable, state-of-the-art methods in practice around the world, arming readers with a real sense of how to address optimal selection and placement of passive. This book is intended to Digital control system for space structural dampers book the senior or beginning graduate student in mechanical engineering an introduction to digital control of mechanical systems with an emphasis on applications.

The desire to write this book arose from my frustration with the existing texts on digital control, which|whileFile Size: 1MB. Keyyp y Components of Control Systems 4.

Control Loops, Open vs. Closed Loops 5. Terminology 6. The Control Cycle and Control Actions 7. Th E S f C t l S tThe Energy Sources for Control Systems 8. DDC Point Types PNWD-SA Tun ed liqu id damper s: Components of a data acquisition and digital control system for of both new and conventional structural systems.

The use of control and monitoring devices is. in W.G. at “Point A.” At % of the system flow rate (vertical line X) the damper should be fully open. At reduced system flow rates, the damper should be partially closed so that the pressure drop across the Two Position Damper Applications Static Pressure Control Applications.

Second World Conference on Structural Control, Kyoto, Japan, June 28 – July 1, Proceedings, in press. “Smart” Dampers for Seismic Protection of Structures: A Full-Scale Study Billie F.

Spencer, Jr., 1 Guangqiang Yang, 1 J. David Carlson 2 and Michael K. Sain 3 1 Dept. of Civil Engrg. and Geo. Sci., Univ. of Notre Dame, Notre Dame. In the ’s, Taylor Devices was awarded a NASA contract to develop a system to safely disengage hoses and mechanical gear jettisoned off of launch vehicles.

These first motion dampening systems were hydraulic dampers controlled by electronic valves. While this approach safely contained the motion of the gear, the system itself was complex and prone.

Digital Control Engineering Analysis and Design Second Edition M. Sami Fadali Antonio Visioli AMSTERDAM † BOSTON † HEIDELBERG † LONDON NEW YORK † OXFORD † PARIS † SAN DIEGO. This is the final report of a two-year study of digital control systems for space structural dampers, or more specifically, for proof-mass dampers or actuators.

Previously, a proof-mass actuator had been developed, of which twelve had been delivered to NASA, and analog and digital control systems had been developed in prototype form.

Kirchhoff’s. As an example consider first a simple mechanical system, a spring/mass/damper. It consists of a weight m on a spring with spring constant k, its motion damped by friction with coefficient f (Fig. CONTROL SYSTEMS FIGURE Feedback control configuration with cruise control.

system control that uses digital controls zPhysically, DDC encompasses all the two-position dampers, and on/off control. AI DI AO DO DDC: Actions and Reactions Input sensors and status – Best to measure what you want to control – usually space temp zMount between 4 and 5 ft high, out of direct sunlight.

Structural control systems can be utilized to reduce the response of structures under different types of dynamic loads such as external forces, accelerations, earthquakes, winds, traffic and other. Sami Fadali, Antonio Visioli, in Digital Control Engineering, To design a digital control system, a z-domain transfer function or difference equation model of the controller that meets given design specifications, is controller model can be obtained from the model of an analog controller that meets the same design specifications.

Keywords: Seismic response, dampers, structural control systems. *** 1. INTRODUCTION Over the past few decades world has experienced numerous devastating earthquakes, resulting in increased loss of human life due to collapse of buildings and severe structural damages.

Describes a PC-based system simulator, which simulates the real-time response of structure and control hardware. Active, Hybrid and Semi-active Structural Control is a must have reference for researchers, practitioners and design engineers working in.

Damper systems are designed and manufactured to protect structural integrities, control structural damages, and to prevent injuries to the residents by absorbing seismic energy and reducing deformations in the structure. Seismic dampers permit the structure to resist severe input energy and reduce harmful deflections, forces and accelerations to structures and occupants.

There are several. This comprehensive handbook is designed to provide the reader with the knowledge needed to successfully implement an active, hybrid or semi-active control system to a structure, safeguarding it against environmental forces such as wind or earthquakes.

Written by leading experts in structural control, this book: Emphasises fail-safe techniques and validates their implementation through. Space Vehicle or its systems and subsystws in detail.

The infomacian presented herein, by rext and sketches, describes launch preparation and determine structural Dwonstrate the launch vehicle guidance and control system during powered flight; achieve guidance'cutoff and evaluate system ac. The page book is an authoritative resource that design engineers, industrial engineering departments, pollution control authorities, FRP manufacturers, and installation contractors can use for the proper selection, manufacture, and installation of FRP duct systems.

More. News SMACNA’s Downspout and Gutter Sizing Calculator. Spencer B F Jr and Dyke S J Semi-active structural control: system identification for synthesis and analysis Proc. 1st Eur. Conf. on Structural Control (Barcelona, ) [33] Spencer B F Jr, Dyke S J, Sain M K and Carlson J D Phenomenological model for magnetorheological dampers J.

Eng. Mech. ASCE   Every manufacturer of an HVAC digital control system uses the DDC to perform pretty much the same functions. The catch is that each DDC system has different ways of letting you use these functions.

If you are used to operating computers, you have the basic knowledge required. An innovative concept, smart structural systems have proven to be extremely effective in absorbing damaging energy and/or counteracting potentially devastating force, thus limiting structural collapse and subsequent injury.

As this technology rapidly evolves, there is an ever-increasing need for an authoritative reference that will allow those in the field to stay abreast of the very latest. The various signals of the above digital system schematic can be represented by the following plots. The purpose of this Digital Control Tutorial is to demonstrate how to use MATLAB to work with discrete functions, either in transfer function or state-space form, to design digital control systems.

Design of the Wireless Structural Sensing and Control System. The feasibility of the proposed wireless structural sensing and control system has been previously validated in a simpler set of control tests (Wang et al., b). Wireless sensing and control units are the building blocks of the real-time wireless feedback control system.

Control valves and control dampers are the two primary means to control the flow of water and air in heating, ventilation, and air conditioning (HVAC) systems.

The control valve is possibly the most important component of a fluid distribution system because it regulates the flow of fluid to the process under control.

of Control Systems 2–1 INTRODUCTION In studying control systems the reader must be able to model dynamic systems in math-ematical terms and analyze their dynamic characteristics.A mathematical model of a dy-namic system is defined as a set of equations that represents the dynamics of the system accurately, or at least fairly well.

Efficient control system us used to adjust this force to achieve performance Use variable orifice valve capable of varying flow of hydraulic damper. Damping capacity is obtained from viscous liquid. Naveed Anwar 38 Common Semi-active Control Systems Electrorheological Dampers Based on smart ER fluids containing dielectric particles.

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Air Handling System Control Applications Abbreviations and symbols Requirements for Effective Control (general guidelines) Different HVAC processes ASHRAE Psychrometric Charts.