<p class="MsoNormal">Iris, a flat circular membrane in the middle layer of human eyeball, is controlled by sympathetic nerve and can automatically adjust pupil size according to light intensity to limit the amount of light entering the eyeball. The artificial iris mechanism was first used by the camera to form a shutter to adjust the aperture size. Artificial iris mechanism which has light weight and less volume was proved to be applied into fluid velocity control system for its characteristics of changing the way of space flow from horizontal motion to rotary motion. However, their nonlinear driving characteristics and interaction with fluid medium create a great challenge to realize the closed-loop control of this non liquid filled regulation. This paper attempts to introduce the artificial iris diameter changing mechanism into hydraulic machinery, that is, to control the hydraulic retarder without filling fluid by changing the inner diameter of iris and changing the flow path of retarder. Through the decomposition and reconstruction of the intrinsic characteristics of the instantaneous image of the flow field, the flow field characteristics of the iris retarder are deeply understood, and the fast prediction of the braking torque is realized. At the same time, the artificial neural network controller is designed to intelligently adjust and control the iris opening to realize the adaptive adjustment of the output torque of the retarder to overcome the difficulty on-line observation of actual filling rate of oil problem and the inaccurate tracking of braking torque on traditional hydrodynamic retarder with filling rate control. Our work prove that the nonlinear controller can achieve fast and accurate torque closed-loop torque control in constant torque braking, constant speed braking, emergency braking and other braking conditions compared with the hydraulic rate control retarder, and the potential of iris mechanism for adaptive control of hydraulic retarder is verified.</p>

Proper Orthogonal Decomposition Analysis and Braking Control on Hydrodynamic Retarders by Bionic Iris Effective Diameter Regulation

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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