Compensation of Nonlinear Harmonic Coupling for Pulsed-Jet-Velocity Shaping
Compensation of Nonlinear Harmonic Coupling for Pulsed-Jet-Velocity Shaping
复制标题
脉冲射流速度整形的非线性谐波耦合补偿
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. M’Closkey
中科院分区：
文献类型：
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作者：
Cory Hendrickson;R. M’Closkey
本文描述了脉冲喷射实验研究中的周期参考跟踪方法。其目的是将射流的时间速度剖面与周期性参考相匹配。挑战在于控制与喷射速度相关的高度非线性且人们知之甚少的动力学。虽然致动器在射流速度上保持良好的权威，但非线性射流动力学在相邻谐波之间产生高度耦合，这取决于强制水平和所需波形。通过将射流速度测量值解调成以所需波形中表示的谐波频率为中心的基带分量来量化耦合。通过扰动基带分量并测量其对相邻谐波的影响，开发了经验输入输出关系，并且表明这种关系可以建模为线性多输入/多输出系统。利用这一知识来创建稳定的反馈控制，…
This paper describes an approach to periodic reference tracking in a pulsed-jet-injection experimental study. The objective was to match the jet’s temporal velocity profile to a periodic reference. The challenge lies in controlling the highly nonlinear and poorly understood dynamics associated with the jet velocity. Although the actuator maintains good authority over the jet velocity, the nonlinear jet dynamics creates a high degree of coupling among neighboring harmonics that depends on the forcing level and the desired waveform. The coupling is quantified by demodulating the jet-velocity measurement into baseband components centered at the harmonic frequencies represented in the desired waveform. An empirical input–output relationship is developed by perturbing the baseband components and measuring their effect on neighboring harmonics, and it is shown that this relationship can be modeled as a linear multi-input/multi-output system. This knowledge is exploited to create stabilizing feedback controls th...