Apparatus for the determination of unbalance in rotating bodies
OwnerAngel J. Mortenseninventor
Life of this patent
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Abstract
A balancing system for the determination of unbalance in rotating bodies in which noise problems are reduced by the formation of average values of the vibration signals generated by the rotating bodies, each average value corresponding to each of a number of angular positions of the rotating body. Transducers are used to convert the mechanical vibration of a rotating body to an electrical signal which is then periodically sampled with the value of the sample being stored in a memory cell. The samples for each revolution are then used to form either an average value or an exponential average value. The average values so obtained have a relatively high signal to noise ratio.
Claims7
An apparatus for determination of unbalance in rotating bodies consisting of:
- a test bench in which a body can be fixed and rotated,
- devices which measure the vibrations caused by the rotating body unbalances and convert mechanical vibrations or pressure variations to electrical signals,
- electronic instrument means to evaluate the amplitudes and angular positions of the unbalances from the electrical signals, said electronic instrument means comprising sampling circuits for sampling said signals, an angular position indicating device connected to said test bench and body which delivers corresponding signals for each of a predetermined number of angular positions, e.g. 100, to said sampling circuits for activating said circuits, and storing means in which predetermined fractions of the sampled signals are stored during a number of revolutions to form average values for each of the predetermined angular positions.
Dependencies are inferred from the claim text.