Dynamic Balancing

what are three types of transducers

1-accelerometer 2-displacement transducer probe 3-velocimeter

what methods are used to correct for unbalance

1-add weight 2-remove weight 3-mass center

what factors will effect the balance machine readout of a rotors vibration amount and location

1-change in RPM 2-location of transducer 3-mass of rotor 4-damping change

state four advantages for balancing dynamic components

1-more power 2-decrease wear 3-improved reliability 4-less noise 5-better mpg

vibration patterns occur as a result of different types of unbalance. what are the four classifications of types of unbalance

1-static 2-couple 3-quasi-static 4-dynamic

what methods are used for Rotor Tracking

1-strobe lights 2-flag 3-electro optical lazer

give four causes of unbalance that result in vibration

1-tolerances in fabrication 2-variations in materials 3-Non-symmetry of design/use(unsymmetrical in use) 4-uneven mass distribution

what are the two bits of information obtained from all balancing machines that allow the operator to balance the component

amount and location

what is a transducer

an electro-mechanical device that measures the amount of vibration

what type of transducer measures the distance between the principle inertial axis and shaft axis as the machine is brought up to speed

displacement probe

what is the main difference between a hard bearing and soft bearing balancing machine

hard bearing: done before soft bearing: done after =resonance check

how does Rotor Tracking affect Dynamic Balance

must be done first

what is meant by "correction plane"

plane on machine where weight is added or removed. plane perpendicular to shaft axis, where add and subtract weight.

what functions does the interrupter serve

provides a reference point, gives us clock angles as it passes over the magnetic tip

how does resonance affect the measurement of unbalance

rotor blade must pass through resonance up to 179 degrees

what is residual unbalance

unbalance left over once your done balancing "amount left over after dynamic balancing"

regarding balancing machines. what is meant by plane separation? or plane transposition?

unbalance on one end causes reading at other end of shaft

is gravitational balance used when balancing propellers? example

yes! gravitational stational balance weights; on the dash 8, blades are balanced after assembly