Wind tunnel strut vibration suppression method based on fuzzy and proportional-derivative control dynamic switching

Abstract

The invention discloses a wind tunnel strut vibration suppression method based on fuzzy and proportional-derivative control dynamic switching, which belongs to the technical field of wind tunnel test and relates to a wind tunnel strut vibration suppression method based on fuzzy and proportional-derivative dynamic switching. The method uses fuzzy control and PD control algorithm to dynamically switch under certain conditions, uses fuzzy control to control the situation of rapid increase of energy, and uses PD control to continue controlling the situation that the energy has been controlled to a certain level. The accelerometer is used to obtain the signal representing the vibration as the feedback signal, which is calculated by the controller and amplified by the power amplifier to realize the control of the piezoelectric actuator and the active vibration suppression of the wind tunnel model. This method combines the advantages of fast fuzzy control and accurate PD control, and makes up for the problems that the previous test methods are not fast enough and stable enough accurately, which are reliable, robust and suitable for practical measurement of wind tunnel experiments.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a method for suppressing vibration of a wind tunnel strut based on dynamic switching between fuzzy and proportional differential control. Background technique [0002] The wind tunnel test is based on the principle of relativity of motion, fixing the model or object of the aircraft in an artificial environment on the ground, artificially creating airflow to simulate various complex flight states in the air, obtaining experimental data, and in the process of designing the aircraft In this case, wind tunnel tests must be carried out. [0003] During the wind tunnel test, the aircraft needs to be supported. Generally, the tail support method is adopted, which has the least impact on the flow field. The tail support system is composed of a machete, a support rod, a force measuring balance and a model, and is a typical cantilever structure. The strut length of...

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Problems solved by technology

In 2005, Yang Enxia of Harbin Engineering University and others designed the combination of tensioning line and tail support in "Design of Large Angle of Attack Tensioning-Tail Brace Combination Support Equipment" [J]. Mechanical Engineer, 2005(7): 113-114 Supporting equipment, which has the advantages of good stiffness and high natural frequency, but will cause changes in the shape of the wind tunnel test model that are not measured by experimental data

[0005] All of the above have achieved results in controlling vibration, but the situation in the wind tunnel is changeable and complicated. The traditional PID control requires off-line testing to set the PID parameters. It is difficult to use it continuously for a long time in the wind tunnel process, and other intelligent control algorithms respond Slow speed, unstable control and other problems, and the vibration energy of the strut in the wind tunnel is often accumulated rapidly. If it cannot be dissipated in time and exceeds the output capacity of the actuator, the system will become unstable, the active vibration control will fail, and the damage will be caused. wind tunnel safety

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