Aeroelasticity MCQ
What is the system that controls the direction in which a plane flies?
Answer
Correct Answer:
Flight Control Systems
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What type of system has the disadvantage of having flammable fluids?
Answer
Correct Answer:
Hydraulic system
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What theory describes the idealised flow of a propeller disk?
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What is the process known as when resonance occurs?
Answer
Correct Answer:
Excitation
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What does divergence stiffness go to zero as?
Answer
Correct Answer:
Buckling instability
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What type of mode is present in the coupled mode flutter graph?
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What value does the torsion mode and bending mode asymptote?
Answer
Correct Answer:
Critical velocity of flutter
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When does coupled mode flutter occur?
Answer
Correct Answer:
When the real part of the damping is zero
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Along with coupled mode flutter, what happens when the real part of the damping is zero?
Answer
Correct Answer:
Critical velocit
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What can you do to simplify the static equation?
Answer
Correct Answer:
Simplify with symmetric wing
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What is the first step in Lagrange formalism?
Answer
Correct Answer:
First, write out the degrees of freedom
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What type of fatigue is due to Sonic?
Answer
Correct Answer:
Due to vibrations excited by jet / propeller noise
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Stress fluctuations induced by thermal expansion are known as what?
Answer
Correct Answer:
Thermal fatigue
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What does fretting fatigue cause?
Answer
Correct Answer:
Small scale rubbing movement/abrasion of adjacent parts
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What type of corrosion develops on a material that is exposed to moisture?
Answer
Correct Answer:
Corrosion fatigue
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What causes corrosion fatigue?
Answer
Correct Answer:
Surface corrosion
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What is a property of cyclic fatigue?
Answer
Correct Answer:
Repeated fluctuation loads
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What is the scientific term for cyclic fatigue?
Answer
Correct Answer:
Repeated fluctuation loads
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How many types of fatigue are in aircraft structures?
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What is the goal of the Master event sequence?
Answer
Correct Answer:
Development of flight by flight for spectrum of 1900 cycles
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What kind of manoeuvres should a mission have in order to withstand gust loads?
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How many flight cycles are in the spectrum for fatigue evaluation for transport planes?
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What is the name of the mission that represents a/c structural life defined?
Answer
Correct Answer:
Missions that represent a/c structural life defined
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What is the term for the failure of an aircraft due to a defect in the construction of the airframe?
Answer
Correct Answer:
Structural failure
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Along with corrosion, what event can cause a plane to break apart from its constituent parts?
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What is the period of time during which aircraft structure is reasonably free from significant cracking?
Answer
Correct Answer:
Design service goal
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How long does the structure retain the required residual strength?
Answer
Correct Answer:
A period of use
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What does the residual strength plot give information about?
Answer
Correct Answer:
How much less loads/stress a part can withstand with a growing crack
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In which facility is curved panel testing done?
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What type of testing is performed on aircraft components on Level 3?
Answer
Correct Answer:
Structural components
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What is the term for tests on structural details?
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What are the tests done on at the second level of testing?
Answer
Correct Answer:
Structural details
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What level of testing is Coupon tests?
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In what area are coupon tests conducted?
Answer
Correct Answer:
Aircraft testing
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What are coupon tests?
Answer
Correct Answer:
Stress-strain diagrams
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What term refers to the ratio of minimum stress to maximum stress?
Answer
Correct Answer:
Stress ratio
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What does the secondary structure of a building act as?
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What does the secondary structure of a plane do?
Answer
Correct Answer:
Carries only air
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What are the primary structural elements?
Answer
Correct Answer:
Aircraft structure elements
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What is an example of insufficient torsional stiffness?
Answer
Correct Answer:
Control reversal
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What is the name of the Torsional stiffness not sufficient to maintain structure in a stable position as speed increases?
Answer
Correct Answer:
Divergence on a wing
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What can Flutter on a wing be compared to?
Answer
Correct Answer:
Dynamic instability of elastic structure in an airstream
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What is the result of increasing speeds on a wing?
Answer
Correct Answer:
Dynamic instability of the elastic structure
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What is a single event?
Answer
Correct Answer:
Static loading
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What are multiple events as cycles with variable stress levels called?
Answer
Correct Answer:
Dynamic loading
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What is an example of the interaction of flow with aircraft structural components?
Answer
Correct Answer:
Aeroelasticity
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What does aeroelasticity refer to?
Answer
Correct Answer:
Structural response
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What are the loads on components due to unsteady flow?
Answer
Correct Answer:
Buffeting loads
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What aspect of an aircraft's structure responds to external atmospheric disturbances?
Answer
Correct Answer:
Dynamic response
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What is one example of an external atmospheric disturbance?
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What can flutter occur on besides aircraft?
Answer
Correct Answer:
Structures
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What kind of vibration occurs when a lifting surface bends?
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What is an example of a dynamic aeroelastic phenomenon?
Answer
Correct Answer:
Dynamic Aeroelasticity studies the interactions among aerodynamic, elastic, and inertial forces
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What type of forces are involved in dynamic aeroelasticity?
Answer
Correct Answer:
Aerodynamic, elastic, and inertial forces
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What is the term used to describe the interactions among aerodynamic, elastic, and inertial forces?
Answer
Correct Answer:
Dynamic Aeroelasticity
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What type of deformation can cause control surface reversal?
Answer
Correct Answer:
Structural
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What is the loss of expected response of a control surface?
Answer
Correct Answer:
Control surface reversal
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When does divergence occur?
Answer
Correct Answer:
When a lifting surface deflects under aerodynamic load
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When a structure deflects under aerodynamic load, it is said to have experienced what phenomenon?
Answer
Correct Answer:
Divergence
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What type of interaction between aerodynamic and elastic forces is aeroelasticity?
Answer
Correct Answer:
Static aeroelasticity studies
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The interaction between what two types of forces is studied by aeroelasticity?
Answer
Correct Answer:
Aerodynamic and elastic
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What property is not significant in a study of aeroelasticity?
Answer
Correct Answer:
Mass properties
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What does the term 'buffeting' refer to?
Answer
Correct Answer:
A high-frequency instability
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What is another name for the high frequency instability caused by airflow separation or shock wave oscillations from one object striking another?
Answer
Correct Answer:
Buffeting
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What is the flutter speed of an aircraft that flies through transonic Mach numbers?
Answer
Correct Answer:
Close to flight speed
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In which year was the first report of "transonic dip"?
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Failures of what lead to flutter on aircraft?
Answer
Correct Answer:
Engine supports
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Which company had an accident due to flutter in 1959?
Answer
Correct Answer:
Braniff Flight 542
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What structure is supporting the rotating propeller in flutter?
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What is another name for flutter?
Answer
Correct Answer:
Propeller whirl flutter
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Failure of engine supports caused the phenomenon known as what?
Answer
Correct Answer:
Whirl flutter
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What can cause the destruction of an aircraft?
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Flutter refers to the destruction of an aircraft due to what?
Answer
Correct Answer:
The uncontained vibration
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What is the term used to describe the vibration that can lead to the destruction of an aircraft?
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What type of moment does reversal of control activation produce?
Answer
Correct Answer:
Aerodynamic
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Where does control reversal occur?
Answer
Correct Answer:
Control reversal where control activation produces an opposite aerodynamic moment
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What causes control reversal?
Answer
Correct Answer:
Control activation
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What increases the angle of attack of wing?
Answer
Correct Answer:
Aerodynamic forces
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Where do aerodynamic forces increase the angle of attack of a wing?
Answer
Correct Answer:
Divergence
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Where does divergence occur?
Answer
Correct Answer:
Divergence where the aerodynamic forces increase the angle of attack of a wing
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What type of response is dynamic aeroelasticity concerned with?
Answer
Correct Answer:
Vibrational
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What is the study of the interactions between the inertial, elastic and aerodynamic forces occurring while an elastic body is exposed to a fluid flow?
Answer
Correct Answer:
Aeroelasticity
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