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Aircraft Vibration Research and Analysis: Types and Causes

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Questions and Answers

What is the main difference between buffet and flutter?

Buffet is a random vibration, while flutter is a harmonic vibration.

Buffet is associated with separated airflow, while flutter is caused by turbulent air.

Buffet is a low-level vibration, while flutter can cause structural failure.

Buffet is caused by aerodynamic excitation, while flutter is an unstable condition caused by unsteady aerodynamics. (correct)

Which of the following is NOT a cause of airplane vibration mentioned in the text?

Aerodynamic forces

Improper weight distribution (correct)

Atmospheric turbulence

Mechanical malfunctions

What is the difference between noise and vibration described in the text?

Noise is a random vibration, while vibration can be either random or harmonic.

Noise is a harmonic vibration, while vibration can be either random or harmonic.

Noise is a vibration that excites the air and can be heard, while vibration is a physical movement of an object. (correct)

Noise is a form of vibration, while vibration is caused by noise.

Which of the following is considered a normal vibration for an airplane?

Vibrations caused by engine operation at certain spool speeds Signup and view all the answers

What does the text suggest about how flight crews detect abnormal vibrations?

Flight crews use their experience with normal vibrations to identify abnormal events. Signup and view all the answers

What is the main characteristic of an abnormal vibration mentioned in the text?

It has a sudden onset and may be accompanied by noise. Signup and view all the answers

What is the main purpose of the lecture on aircraft vibration research and analysis?

To investigate the causes of aircraft vibration during flight Signup and view all the answers

What is a key reason why flight crews need to understand the causes and effects of aircraft vibration?

To maintain flight safety and prevent excessive wear or airframe damage Signup and view all the answers

What is the key difference between harmonic vibration and random vibration, as described in the text?

Harmonic vibration has constant frequency and magnitude, while random vibration has varying frequency and magnitude Signup and view all the answers

What are some of the common causes of airplane vibration during flight?

Landing gear extension/retraction, speed brake extension, and system malfunctions Signup and view all the answers

What is the primary role that flight crews can play in addressing aircraft vibration issues, according to the text?

Providing detailed reports of in-service vibration events to facilitate troubleshooting and maintenance Signup and view all the answers