A two-degree-of-freedom controller for a high-precision air temperature control system with multiple disturbances

Dong, He; Li, Xiaoping; He, Xin; Zeng, Zhibo; Wen, Guojun

doi:10.1016/j.csite.2023.103442

Case Studies in Thermal Engineering

2023

DOI: 10.1016/j.csite.2023.103442

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A two-degree-of-freedom controller for a high-precision air temperature control system with multiple disturbances

He Dong,

Xiaoping Li,

Xin He

et al.

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2024

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Cited by 4 publications

References 30 publications

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Frequency-domain analysis of two controllable attenuators for control processes and perturbations in a constant temperature chilled-water system

Guo,

Hong,

Chen

et al. 2024

Applied Thermal Engineering

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Frequency-domain analysis of two controllable attenuators for control processes and perturbations in a constant temperature chilled-water system

Guo,

Hong,

Chen

et al. 2024

Applied Thermal Engineering

View full text Add to dashboard Cite

Modeling temporal dual variations for return air temperature prediction of mK-level temperature-controlled clean chamber

Yu,

Dong,

Zeng

et al. 2024

Journal of Building Engineering

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Influence of dual purging jets on interferometric measurement of optical path difference

Cao,

Wang,

Liu

2024

Physics of Fluids

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Incompressible large eddy simulations of dual purging jets at three Reynolds numbers of ReL = 1500, 1000, and 500 are performed, providing the database for simulated interferometric measurements subjected to the spatiotemporally varying temperature fields. The temperature is modeled as a passive scalar, and the index-of-refraction field is calculated from the air temperature and pressure using the modified Edlén equation. Based on wave optics, wavefront distortions of laser beams traversing the flow field are computed, and the optical path difference measurement is simulated. Statistical results of the velocity and temperature indicate distinctly different flow patterns at three Reynolds numbers. Spectral proper orthogonal decomposition is adopted to analyze the relationship between coherent flow structures and temperature wavepackets. There is a dominant frequency (St = 0.29) at ReL = 1500 and 1000, which is attributed to the Kelvin–Helmholtz instability, whereas the two jets have notable flapping behaviors at ReL = 500. The wavefront distortions are found to be insensitive to the Reynolds number. The effects of the flow region and tracing distance are examined, and the optical performances of different beam pairs for interferometry are evaluated. The optical beams passing through the outer shear layers of the dual jets and wall jets are distorted severely, resulting in large systematic and random errors in the interferometric measurement.

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A two-degree-of-freedom controller for a high-precision air temperature control system with multiple disturbances

Cited by 4 publications

References 30 publications

Frequency-domain analysis of two controllable attenuators for control processes and perturbations in a constant temperature chilled-water system

Frequency-domain analysis of two controllable attenuators for control processes and perturbations in a constant temperature chilled-water system

Modeling temporal dual variations for return air temperature prediction of mK-level temperature-controlled clean chamber

Influence of dual purging jets on interferometric measurement of optical path difference

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