Apparatus and methods for analyzing unbalance in rotatable bodies

Claim 1

Apparatus for analyzing unbalance in a rotatable body comprising means for rotating said body, means for determining the angular locus of unbalance in said body, means for providing a first signal representative of the amount of unbalance in said body, means for providing a second signal representative of the amount of unbalance in said body with a known amount of change in unbalance applied thereto along the locus, a meter, means for applying said first and second signals to said meter, means for adjusting said meter to a predetermined setting responsive to one of said first and second signals, said meter when adjusted adapted to read the amount of unbalance responsive to the application of said other signal; wherein said first and second signal providing means comprise means for generating d.c. signals having a level proportional to the amplitude of vibration of said rotating body, and means for storing said d.c. signals; wherein said adjusting means comprises a variable resistance, and wherein said signal applying means comprises a differential amplifier having said meter and said variable resistance series connected across its output, a field-effect transistor connected to the input of said differential amplifier, and switch means for selectively connecting said storing means to the gate input of said field-effect transistor.

Claim 5

A method of balancing a rotatable body comprising the steps: a. spinning the body about its rotational axis, b. determining the angular locus of unbalance while said body is spinning, c. providing a first electric signal the amplitude of which is proportional to the amount of unbalance at a particular speed and adjusting a meter calibrated in accordance with the formula D'' D (X-a)/X to give an unbalance set point reading, D, in response to the first electrical signal, d. applying a known amount of test weight a diametrically opposite the angular locus of unbalance determined by step, (b), e. spinning the body with the known test weight a applied diametrically opposite the angular locus of unbalance, f. providing a second electric signal to the set point adjusted meter the amplitude of which is proportional to the amount of unbalance with the known test weight a being applied (i.e., X-a) at said particular speed, g. determining the actual amount of unbalance in the body in accordance with the proportionality (X)/(X-a) (D)/(D'') by direct reading of the meter during step (f) in which varying meter calibrations, D'', are displayed to read in terms of unbalance correction weight, and where in the above steps: X is the actual amount of unbalance, D is proportional to the amplitude on the first signal, D'' is proportional to the amplitude of the second signal, and a is the known amount of test weight, h. and placing a weight to correct the unbalance of said body in an amount determined by step (g) diametrically opposite the angular locus of unbalance.

Claim 6

A method of balancing a rotatable body comprising the steps: a. spinning the body about its rotational axis, b. determining the angular locus of unbalance while said body is spinning, c. providing a first electric signal the amplitude of which is proportional to the amount of unbalance at a particular speed and adjusting a meter calibrated in accordance with the formula D'' D (X-a)/X to give an unbalance set point reading, D, in response to the first electrical signal, d. applying a known amount of test weight a diametrically opposite the angular locus of unbalance determined by step, (b), e. spinning the body with the known test weight a applied diametrically opposite the angular locus of unbalance, f. providing a second electric signal to the set point adjusted meter the amplitude of which is proportional to the amount of unbalance with the known test weight a being applied (i.e., X-a) at said particular speed, g. determining the actual amount of unbalance in the body in accordance with the proportionality (X)/(X-a) (D)/(D'') by direct reading of the meter during step (f) in which varying meter calibrations, D'', are displayed to read in terms of unbalance correction weight, and where in the above steps: X is the actual amount of unbalance, D is proportional to the amplitude on the first signal, D'' is proportional to the amplitude of the second signal, and a is the known amount of test weight, h. and placing a weight to correct the unbalance of said body in an amount determined by step (g) diametrically opposite the angular locus of unbalance.

Claim 9

A method of balancing a rotatable body comprising the steps: a. spinning the body about its rotational axis, b. determining the angular locus of unbalance while said body is spinning, c. applying a known amount of test weight a at the locus of unbalance and providing a first electric signal the amplitude of which is proportional to the amount of unbalance plus the applied test weight at a particular speed and adjusting a meter calibrated in accordance with the formula D (D''X/X+a) to give unbalance set point reading, D'', in response to the first electrical signal, d. removing the known amount of test weight a, e. spinning the body with the test weight a removed, f. providing a second electric signal the amplitude of which is proportional to the amount of unbalance at said particular speed, g. determining the actual amount of unbalance in the body in accordance with the proportionality (X)/(X+a) D/D'' by direct reading of the meter during step (f) in which varying meter calibrations, D, are displayed to read in terms of unbalance correction weight, and where in the above steps: X is the actual amount of unbalance, D'' is proportional to the amplitude of the first signal, D is proportional to the amplitude of the second signal, and a is the known amount of test weight, h. and placing a weight to correct the unbalance of said body oF an amount determined by step (g) diametrically opposite the angular locus of unbalance.

Claim 10

A method of balancing a rotatable body comprising the steps: a. spinning the body about its rotational axis, b. determining the angular locus of unbalance while said body is spinning, c. applying a known amount of test weight a at the locus of unbalance and providing a first electric signal the amplitude of which is proportional to the amount of unbalance plus the applied test weight at a particular speed and adjusting a meter calibrated in accordance with the formula D (D''X/X+a) to give unbalance set point reading, D'', in response to the first electrical signal, d. removing the known amount of test weight a, e. spinning the body with the test weight a removed, f. providing a second electric signal the amplitude of which is proportional to the amount of unbalance at said particular speed, g. determining the actual amount of unbalance in the body in accordance with the proportionality (X)/(X+a) D/D'' by direct reading of the meter during step (f) in which varying meter calibrations, D, are displayed to read in terms of unbalance correction weight, and where in the above steps: X is the actual amount of unbalance, D'' is proportional to the amplitude of the first signal, D is proportional to the amplitude of the second signal, and a is the known amount of test weight, h. and placing a weight to correct the unbalance of said body oF an amount determined by step (g) diametrically opposite the angular locus of unbalance.