Control of large cryogenic tunnels

Balakrishna, S.; Kilgore, W. Allen; Thibodeaux, J. J.

doi:10.2514/6.1992-3930

Cited by 9 publications

(23 citation statements)

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“…The modeling of the tunnel dynamics mainly follows the study in the works of Balakrishna et al and Zhu et al The average tunnel states would be determined by regular thermodynamics and physical laws with lumped modeling approach. With the aid of mathematical model of the tunnel, control laws can be designed for the wind tunnel.…”

Section: Dynamic Model Of Cryogenic Wind Tunnelmentioning

confidence: 99%

“…These parameters can be used to compute Qf ( t ),

W_{g}

, C V above. For the definitions or uses of these parameters, one can refer to the works of Balakrishna et al and Zhu et al…”

Section: Dynamic Model Of Cryogenic Wind Tunnelmentioning

confidence: 99%

“…Remark The temperature dynamics used in the works of Zhu et al did not include the thermal term caused by gas mass discharge

m_{g}

as it does in the work of Balakrishna et al This is because the gas discharge rate is relatively small compared to the whole gas mass

W_{g}

in the tunnel, and the gas mass discharge does not have obvious effect on the temperature changes of residential gas inside of the wind tunnel. It will affect the temperature dynamics through the term of gas mass

W_{g}

, which would vary with the injection mass m L and gas discharge mass

m_{g}

.…”

Section: Dynamic Model Of Cryogenic Wind Tunnelmentioning

confidence: 99%

“…This facility could produce Reynolds number close to true flight . In cryogenic condition, the Reynolds number is increased due to the increased gas density and decreased viscosity of the gas at cryogenic temperatures . The increased Reynolds number would make the test of flight vehicles on the ground test facility has more similarities and would be more comparable with true flight test.…”

Section: Introductionmentioning

confidence: 99%

“…Most researches have been conducted at TCT, NTF of NASA Langley and ETW in Europe. A nonlinear gain scheduled proportional integral (PI) controller with feedforward control was deployed in NTF in its early stages of operation . In 1990s, a control algorithm with self‐learning capabilities was designed and implemented in ETW .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High performance nonlinear adaptive control of temperature in cryogenic wind tunnel

Zhu

Wang

Yin

et al. 2019

Intl J Robust & Nonlinear

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A new nonlinear adaptive control method based on Immersion and Invariant (I&I) approach is proposed for the temperature control of a cryogenic wind tunnel. The proposed control method can be applied to wide range temperature operation of the tunnel by incorporating the nonlinear dynamic model of temperature into the controller design. By constructing globally stable nonlinear observer, and rendering an invariant and attractive manifold in the state space of plant and observer, the uncertain gain of known disturbance and unknown wind tunnel wall temperature are considered in the same manner within the adaptive I&I control frame. In the design, nominal heat transfer coefficient is deployed to avoid complicated design process involving nonlinear parameterization. This design leads to an adaptive output feedback stabilization control law for the temperature with guaranteed transient and steady performance, which exhibits reasonable robustness to time delay in the control input channel and other uncertainties. The analysis and simulation show the effectiveness of the proposed control methodology. KEYWORDS cryogenic wind tunnel, immersion and invariant, nonlinear adaptive control, nonlinear observer, output feedback, temperature control 5118

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Section: Dynamic Model Of Cryogenic Wind Tunnelmentioning

confidence: 99%

“…These parameters can be used to compute Qf ( t ),