Precise temperature control for measurement purposes

Orzyłowski, M.; Kaluzniacki, T.; Rudolf, Z.; Nowicki, G.

doi:10.1109/imtc.1999.776712

Cited by 3 publications

(2 citation statements)

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“…Their research included the use of a scalar linear-quadratic-gaussian (LQG) self-tuning controller module, for improved disturbance rejection and ability to deal with timevarying process behaviour. Orzylowski et al [9] discuss optimal and suboptimal control, based on the linear-quadratic {LQ) performance index, for their furnace batch temperature control system. Yet another temperature control application is found in the woric of Mizoguchi et al [10], where the temperature of a beverage at a bottle filling plant is regulated using a bypass valve in the coolant flow channel.…”

Section: Overview Of Temperature Controlmentioning

confidence: 99%

“…A heat exchanger is the device that implements such an exchange, effectively changing the temperature distribution of the two fluids. They can be found in many applications, such as chemical processing [9,10], automobiles and aerospace vehicles [11,12], metallurgy [9], air-conditioning [1], power production [4,8], waste heat recovery etc. [13].…”

Section: An Overview Of Heat Exchanger Design and Applicationsmentioning

confidence: 99%

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Bleed Air Temperature Regulation System: Modeling, Control, and Simulation

Hodal¹

2021

Preprint

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This thesis addresses temperature control of an engine bleed air system, as used on typical aircraft, with a control strategy aimed at reducing ram air usage while maintaining fast response. The analytical equations describing the system dynamics are presented, and a state space model of a cross-flow heat exchanger is developed. The heat exchanger model is then utilized in the modeling of the bleed air system under study. Different control strategies and configurations are analyzed and compared. In order to achieve fast temperature regulation while saving ram air usage, a ram-air-plus-bypass control configuration is proposed, along with the control of both load temperature and bypass valve opening. Classical PI control is employed, and a hybrid LQ/PI control method is additionally investigated for the proposed control configuration. Simulations for each control strategy are performed using a nonlinear dynamic model at several sample mission operating points, with consideration of disturbances in engine loading of ambient conditions. Comparisons are made and conclusions are drawn based on these simulations. The proposed configuration and control strategy prove to be more effective in terms of satisfying both low ram air usage and fast temperature control response.

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Section: Overview Of Temperature Controlmentioning

confidence: 99%