Constant velocity air inlet controller

R. S. Gates; D. G. Overhults; B. L. Walcott; S. A. Shearer

doi:10.1016/0168-1699(91)90031-4

Constant velocity air inlet controller

R. S. Gates, D. G. Overhults, B. L. Walcott, S. A. Shearer

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The experimental implementation of a microprocessor-based controller to adjust the width of hinged baffled slot inlets is described. The system was designed to utilize a velocity sensor which output a digital pulse train proportional to the air velocity as the feedback mechanism to the controller. The controller adjusted the slot width as necessary to maintain a setpoint velocity within a specified deadband. Results, in terms of system response to a step change in either air flow rate (such as additional fans turning on), or to a step change in setpoint velocity, are presented. An analysis of this nonlinear control system resulted in the characterization of the system response in terms of a linear, second-order model. To illustrate a means for further improvement in controller response, the design of a lead compensator cascaded to the original controller is discussed. This method of control is believed to have several advantages compared with current air inlet controllers.

Original language	English
Pages (from-to)	175-190
Number of pages	16
Journal	Computers and Electronics in Agriculture
Volume	6
Issue number	2
DOIs	https://doi.org/10.1016/0168-1699(91)90031-4
State	Published - Oct 1991

ASJC Scopus subject areas

Forestry
Agronomy and Crop Science
Computer Science Applications
Horticulture

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10.1016/0168-1699(91)90031-4

Cite this

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title = "Constant velocity air inlet controller",

abstract = "The experimental implementation of a microprocessor-based controller to adjust the width of hinged baffled slot inlets is described. The system was designed to utilize a velocity sensor which output a digital pulse train proportional to the air velocity as the feedback mechanism to the controller. The controller adjusted the slot width as necessary to maintain a setpoint velocity within a specified deadband. Results, in terms of system response to a step change in either air flow rate (such as additional fans turning on), or to a step change in setpoint velocity, are presented. An analysis of this nonlinear control system resulted in the characterization of the system response in terms of a linear, second-order model. To illustrate a means for further improvement in controller response, the design of a lead compensator cascaded to the original controller is discussed. This method of control is believed to have several advantages compared with current air inlet controllers.",

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AU - Gates, R. S.

AU - Overhults, D. G.

AU - Walcott, B. L.

AU - Shearer, S. A.

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N2 - The experimental implementation of a microprocessor-based controller to adjust the width of hinged baffled slot inlets is described. The system was designed to utilize a velocity sensor which output a digital pulse train proportional to the air velocity as the feedback mechanism to the controller. The controller adjusted the slot width as necessary to maintain a setpoint velocity within a specified deadband. Results, in terms of system response to a step change in either air flow rate (such as additional fans turning on), or to a step change in setpoint velocity, are presented. An analysis of this nonlinear control system resulted in the characterization of the system response in terms of a linear, second-order model. To illustrate a means for further improvement in controller response, the design of a lead compensator cascaded to the original controller is discussed. This method of control is believed to have several advantages compared with current air inlet controllers.

AB - The experimental implementation of a microprocessor-based controller to adjust the width of hinged baffled slot inlets is described. The system was designed to utilize a velocity sensor which output a digital pulse train proportional to the air velocity as the feedback mechanism to the controller. The controller adjusted the slot width as necessary to maintain a setpoint velocity within a specified deadband. Results, in terms of system response to a step change in either air flow rate (such as additional fans turning on), or to a step change in setpoint velocity, are presented. An analysis of this nonlinear control system resulted in the characterization of the system response in terms of a linear, second-order model. To illustrate a means for further improvement in controller response, the design of a lead compensator cascaded to the original controller is discussed. This method of control is believed to have several advantages compared with current air inlet controllers.

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Constant velocity air inlet controller

Abstract

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