Helicopter two-meter-diameter rotor wind tunnel test stand vibration monitoring, early warning and safety protection system

Abstract

The invention discloses a helicopter two-meter-diameter rotor wind tunnel test stand vibration monitoring, early warning and safety protection system. The system comprises an acceleration sensor group, an infrared photoelectric sensor and a processing unit, wherein the acceleration sensor group is installed at a propeller hub of a helicopter two-meter-diameter rotor wind tunnel test stand and isused for measuring vibration response of the test stand; the infrared photoelectric sensor is used for measuring a rotating speed of a rotor; vibration signals collected by the acceleration sensor group and rotating speed signals collected by the infrared photoelectric sensor are sent to the processing unit to be processed, and the processing unit processes, analyzes and records a time domain anda frequency domain of the measured vibration signals. The system has advantages of a simple structure, simple and convenient operation, a good test effect and the like.

Description

technical field [0001] The invention mainly relates to the technical field, in particular to a vibration monitoring, early warning and safety protection system of a 2-meter-diameter rotor wind tunnel test bench for a helicopter. Background technique [0002] In the helicopter wind tunnel test, due to the effects of aerodynamic force, inertial force and centrifugal force, the rotor and its test system are a typical elastic system in a periodic vibration state. For conventional helicopter wind tunnel tests with individual rotors, the vibration problem is often the key to restricting its safe and reliable performance. If the real-time vibration of the test bench cannot be known timely and accurately, once resonance occurs during the test, the test data and test progress will be affected at least, and the test model and test equipment will be damaged at the worst, and even cause personnel safety accidents. [0003] In the traditional helicopter wind tunnel test, the test person...

AI Technical Summary

Problems solved by technology

If the real-time vibration of the test bench cannot be known in a timely and accurate manner, once resonance occurs during the test, it will affect the test data and test progress in the slightest, and will cause damage to the test model and test equipment in severe cases, and even cause personnel safety accidents

[0003] In the traditional helicopter wind tunnel test, the test personnel mainly judge the vibration condition of the test bench through manual observation based on their own experience, which is often easily influenced by human subjective factors and cannot accurately evaluate the current test state

In addition, since the rotor model rotates at high speed in the wind tunnel test of the helicopter, once vibration divergence, bearing jamming, tie rod breakage and other conditions that threaten the safety of the test occur, the reaction time left for the test personnel to perform safe operation is less than 2 seconds. Therefore, the traditional method of manually observing the vibration of the test bench based on experience has a large potential safety hazard

However, this method does not take into account the special environment of the helicopter wind tunnel test. Not only is the installation and erection of other measurement and control equipment at the wind tunnel test site very strict, it may even affect the wind tunnel flow field.

Therefore, the above two methods have only carried out corresponding research on rotor vibration measurement in the laboratory environment, and do not have special early warning and safety protection functions, and cannot meet the unique needs of helicopter wind tunnel tests

Therefore, it can be said that there is currently no wind tunnel test system on the market that integrates vibration monitoring, early warning and safety protection for helicopter wind tunnel tests.

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