Flutter
When the energy that is added to the vibration of the wings by airflow going around it is greater than energy lost by damping, this happens
This is caused by the interruption of airflow
what is buffet
The deployment of this system may cause vibrations
What are aerodynamic brakes
The first test a plane undergoes when testing for flutter
What is the pulse test
If flutter lasts long enough, this can happen
What is aircraft failure
Something that would cause buffet
the deployment of aerodynamic brakes or turbulence
Vibrations may be caused by these two things from within an aircraft
What are stiffness and distribution of mass
The second test a plane undergoes when testing for flutter
What is the sweep test
Flight crews may respond to minor flutter by doing these two things
What is leveling the plane and decreasing the speed
Flutter can occur in this condition whereas buffet cannot
what is smooth air.
What is turbulence
Something that happens if a plane fails the pulse or sweep test
What is wing modifications
Flutter is caused by when this is greater then the energy it looses through dampening measures.
What is airflow going around the wings
Rockets may develop this because of low frequency vibrations within rocket propellant tubes, which may change the flow rate of the propellant
What are longitudinal vibrations
When an engine is operating at a certain level it can cause this
What is resonance
The pulse test is used to determine:
how flutter decreases over time to see if an aircraft is safe.
Flutter is rapid vibrations in a planes wings. Engineers may combat flutter by finding new ways to make the wing dampen the vibrations and doing this, although it may have potential consequences.
What is making the wings more rigid
The pogo effect is caused by this
What is resonance
Resonance is the word for an increased amplitude caused by a force being applied to a system at the same:
natural frequency of the system
something the sweep test produces in the wing of a plane at multiple frequencies