Feedback Control Theory for Engineers

Atkinson, P.

doi:10.1007/978-1-4684-7453-4

Cited by 18 publications

(7 citation statements)

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“…Corrugated sheet roofs of buildings have been adapted as bare plate collectors for the heating of the air space within the building as in some large solar storage barns (Bailey and Williamson 1965). Generally, optical losses due to transmission reduction of the incoming solar radiation by transparent covers in solar-energy collectors are roughly 10 % (Sodha et al 1987).…”

Section: Air Heating Flat-plate Collectorsmentioning

confidence: 99%

“…The response period corresponds to the standard definition of the response period for a first-order system that is that period within which the transient phase would be completed if the rate of variation of the associated variable was held constant at its initial value (Atkinson 1980). The response function of a collector under steady-state conditions degenerates to a single value, namely the heat-removal factor.…”

Section: Water Heating Flat-plate Collectorsmentioning

confidence: 99%

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Flat-Plate and Evacuated Tube Collectors

Norton¹

2013

Lecture Notes in Energy

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The sun has got his hat on Hip hip hip hooray! The sun has got his hat on, and he's coming out to play Gay and Butler (1932) 5.1 Overview Solar-energy collectors are devices employed to gain useful heat energy from the incident solar radiation. They can be of the concentrating or the flat-plate type. A simple flat-plate solar energy collector consists basically of an absorbing surface which absorbs the insolation and transmit it in form of heat to a working fluid commonly air or water. A general steady-state analysis for flat-plate collectors is shown in Fig. 5.1.Instantaneous efficiencies are plotted against (T fii ÀT a )/I and the intercept and the slope determined (7.1.5). The long-term performance of many solar heating collectors can be characterized by a thus determined intercept and slope as shown by the illustrative examples for different collector types given in Fig. 5.2. These parameters are not constant but depend on temperature and wind speed. Heat removed is also a weak function of overall heat loss. To account for these effects non-linear equations have been developed and together with an angular dependent "incident angle modifier" are used in various versions as the basis for rating tests. These are shown in Fig. 5.3.The absorber material in a flat-plate collector, in addition to having a high absorbance of the incident radiation should also have a low emissivity, good thermal conductivity, and be stable thermally under temperatures encountered during operation and stagnation. It should also be durable, have low weight per unit area and, most importantly, be cheap. Black coated metal sheets (in air heater) and fins in water heaters are used frequently as absorbers due to their effectiveness, ease of use, availability and relatively low cost. Wisely or not, a multitude of

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Section: Air Heating Flat-plate Collectorsmentioning

confidence: 99%

Section: Water Heating Flat-plate Collectorsmentioning

confidence: 99%

Flat-Plate and Evacuated Tube Collectors

Norton¹

2013

Lecture Notes in Energy

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“…The steps adopted here (almost the same mentioned in various advanced control systems books [11,13,14]) while designing the controller are highlighted below.…”

Section: Emulation Approach Based Digital Controllermentioning

confidence: 99%

Compensation of the nonlinearities present in the digital control loop

Abbas

Abid

Farooq

et al. 2016

2016 International Conference on Intelligent Systems Engineering (ICISE)

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This paper highlights the digital control problems and issues during the controller design and suggests the solutions to resolve them. For this purpose, digital controller designed on the basis of digital redesign or emulation technique is applied to a buck converter working in continuous conduction mode. Nonlinearities due to the ADC and DAC quantizers, loop-delay, etc. are introduced into the control loop and their adverse effects on performance are interrogated. The nonlinearities are suppressed by retuning the digital controller. The order of the controller may increase and require more resources for its implementation. The quantizers' nonlinearities add quantization noise into the loop and may cause offsets and limit cycle oscillations (LCOs). The overall phase margin gets reduced due to the delay thus keeping the bandwidth limited and leading the system towards instability. The well-tuned loop remains asymptotically stable if the nonlinearities are neglected. MATLAB/Simulink environment is used to address all the issues.

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“…Each block can be represented by one or a few lines of Basic coding using well-established numerical techniques. 9 3…”

Section: The Cybernetic Interfacementioning

confidence: 99%

Low-cost microprocessor-based system for teaching the c.a.d. of control systems

Atkinson

Allen

1980

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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A low cost system ('Cycloid') has been developed for the teaching of the c.a.d. of control systems. It is based on the Research Machines 380 Z microcomputing system with a coarse-graphics interactive television display. The software which has been developed is written in Basic and is briefly described in the paper. The application of the design suite in the teaching environment is illustrated by reference to a particular example. The low cost and high reliability of the system should make it particularly attractive to teaching establishments and small industry as an alternative to expensive time-shared and minicomputer systems.

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Feedback Control Theory for Engineers

Cited by 18 publications

References 0 publications

Flat-Plate and Evacuated Tube Collectors

Flat-Plate and Evacuated Tube Collectors

Compensation of the nonlinearities present in the digital control loop

Low-cost microprocessor-based system for teaching the c.a.d. of control systems

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