Rotary Week 6 - Vibration
What are the two conditions that when out of balance will lead to a vibration within a spinning rotor system component?
Weight and forces
Lift and drag
Weight and drag
Weight and lift
How can a wheel be statically balanced?
Removing weight from the wheel 180 degrees from the heavy point
Adding weight to the wheel 180 degrees from the heavy point
Adding weight to the wheel 90 degrees from the heavy point earlier in the rotation direction
Adding weight to the wheel 90 degrees from the heavy point later in the rotation direction
What term is used to describe the amount of movement of a rotating body as seen on a dial indicator caused by a dynamic imbalance?
Volume
Altitude
Amplitude
Frequency
What term is used to describe the speed of full movement cycle on a rotating body as seen on a dial indicator caused by a dynamic imbalance where you will see the indicator deflect from 0 -> +5 -> 0 -> -5 -> 0
Frequency
Altitude
Amplitude
Velocity
Which of the following is an example of where you will witness a Sympathetic Vibration?
Driveshaft attached to an out of balance main rotor system
Tail rotor attached to an out of balance main rotor
Tail rotor assembly attached to an out of balance tail rotor gearbox
Seat back assembly attached to aircraft structure on aircraft with out of balance main rotor
What is the significance of the yellow arc on the engine tachometer in the illustration?
Where you complete the Magneto Drop Test
The transit range where continuous operation will be avoided
The Transit range where engine operation will be maintained while the aircraft is on the ground
Lets the pilot know they are approaching the normal flight operating speed for the engine identified by the green arc
Which type of vibration is most often associated with a main rotor out of track condition?
Low frequency vertical
Low frequency lateral
High frequency vertical
High frequency lateral
Which type of vibration is most often associated with a main rotor out of balance condition?
Low frequency vertical
Low frequency lateral
High frequency vertical
High frequency lateral
Which type of vibration is most often associated with a tail rotor out of balance condition?
Low frequency vertical
Low frequency lateral
High frequency vertical
High frequency lateral
What is the primary purpose of the blade tracking activity?
To make certain that all blades weigh the same
To make certain that all blades are at least ½ an inch of vertical separation as they pass through the same point in the tip path plane
To make certain that there is at least an offset if ½ an inch in the spacing between the blades as they pass through the same point in the plane of rotation
To make certain all blades are passing through or traveling within the same tip path plane
Which of the methods of tracking a rotor is most commonly used today?
Stick method
Flag method
Electronic or Strobe method
Pre-track method
When using the Electronic Strobe Tracking System, where can this activity be carried out?
On the ground or in flight
In a hover only
In forward flight only
On the ground only
When using the Electronic Strobe System, ow does the strobe know when to flash the light to illuminate each tip target during each revolution?
An interrupter is mounted on the non-rotating swashplate assembly and a magnetic pickup is mounted on each horn of the rotating portion of the swashplate
A magnetic pickup is mounted on the non-rotating swashplate assembly and an interrupter is mounted on each horn of the rotating portion of the swashplate
The control box is pre-programmed for each model of helicopter
The trigger on the strobe is pressed by the operator as each blade passes the front of the helicopter
What adjustment is most often made to adjust the ground tracking of a helicopter main rotor system?
Rigging of the swashplate
Rigging of the cyclic pitch control
Adjustment of the trim tab
Adjusting the pitch change rod or link
What adjustment is most often made to adjust the flight tracking of a helicopter main rotor system?
Rigging of the swashplate
Rigging of the cyclic pitch control
Adjustment of the trim tab
Adjusting the pitch change rod or link
When you bend the trailing edge of the trim tab DOWN for track adjustment, what will happen to that blade?
It will fly or track lower
It will fly or track higher
It will depend upon the speed of the helicopter
It will sweep forward
When you bend the trailing edge of the trim tab UP for track adjustment, what will happen to that blade?
It will fly or track lower
It will fly or track higher
It will depend upon the speed of the helicopter
It will sweep forward
When you start tracking activities what position should the trim tab be in before starting the first track check?
Full up deflection
Full down deflection
It doesn't matter
Neutral position
On the Hughes or Boeing 500, how are the blade adjustments made for tracking in a hover and in Flight?
Bend the outboard trim tab only in flight
Bend both the inboard and the outboard Trim tabs
Bend specified zones along the trailing edge of the blades as there are no trim tabs on these blades
Bend specified zones along the trailing edge of the blades as the trim tabs are for ground track only
Where will you feel a 1:1 vertical vibration and what is its most likely cause?
In your seat base and it will indicate the helicopter is out of balance
In your seat base and it will indicate the helicopter is out of track
In your stomach and it will indicate the helicopter is out of balance
In your stomach and it will indicate the helicopter is out of track
Where will you feel a 1:1 lateral vibration and what is its most likely cause?
In your seat base and it will indicate the helicopter is out of balance
In your seat base and it will indicate the helicopter is out of track
In your stomach and it will indicate the helicopter is out of balance
In your stomach and it will indicate the helicopter is out of track
What device is used with the Chadwick Helmuth Vibration Analyser to measure the amplitude of a vibration and in what units of measure that it will provide?
An accelerometer is used and it will be measure in revolutions per minute (RPM)
A magnetic pick-up is used and it will be measure in revolutions per minute (RPM)
An accelerometer is used and it will be measure in inches per second (IPS)
A magnetic interrupter is used and it will be measure in inches per second (IPS)
Which type of Main Rotor head design will you adjust blade sweep with a drag link or latch assemblies to adjust chord wise balance during the dynamic balance process?
A rigid rotor head
A semi-rigid rotor head
A fully articulated rotor head
A semi-automatic rotor head
On a rotor head that has adjustments for both chord wise and span wise balance, which adjustment is completed first during the static or dynamic balance process?
Chord wise balance
Span wise balance
It doesn't matter
Whichever requires the greater adjustment
Which type of Main Rotor head design will you add weight to the light blade in order to adjust span wise balance during the dynamic balance process?
A rigid rotor head
A semi-rigid rotor head
A fully articulated rotor head
All types of rotor head designs
What device on the main rotor head is used to help maintain blade balance on a fully articulated main rotor head?
Flapping hinge
Feathering hinge
Dampener
Teetering Hinge
What type of dampener does not contain a fluid to aid in absorbing the energy of the Coriolis Effect?
Hydraulic cylinder dampener
Multiple disk dampener
Elastomeric dampener
They all contain fluid
Which of the following is the best method for checking dampener action and condition?
Bench test
Strobe light to determine if blades are in track
Torque wrench on dampener
Strobe light to determine if blades are out of phase
What does it mean if you have one blade out of phase with the other three blades in a four blades fully articulated main rotor system?
You will see one blade flying higher than the other blades
You will see one blade lagging behind the other blades
You will see one blade flying lower than the other blades
This is not possible only a semi-rigid head can lead or lag
What allows the Elastomeric Dampener to extend and retract as the blade is hunting or leading and lagging
Expansion and compression of rubber material inside the dampener
Movement of fluid from one side to the other of a piston
Compression of the nitrogen gas in the dampener
Rotation of the plates between the elastomers
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