Method of machine vibration analysis for tire uniformity machine
First Claim
1. A method of analyzing the condition of a machine with a plurality of rotating components including a freely rotating load wheel mounted to a load wheel spindle, a motor driven spindle, and a plurality of motor driven rotating grinders, said method including the steps of:
- rotating one or more of said rotating components;
monitoring radial and lateral forces generated by the vibration of said one or more rotating components with load cells mounted to said load wheel spindle;
inputting analog voltage signals from said load cells into a computer, said analog voltage signals corresponding to said monitored radial and lateral forces during a predetermined period of time;
converting said analog signals to digital signals;
converting said digital signals to a frequency domain representation;
converting said frequency domain representation to a power spectrum representing the amplitudes of different frequencies; and
comparing said amplitudes of different frequencies with acceptable amplitudes for selected groups of frequencies.
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Abstract
A method for analyzing the vibration of a tire uniformity machine having a number of rotating components uses the signals from load cells when the machine idle to output voltage signals that are then amplified and input into a computer as unfiltered, amplified voltage signals. The signals are converted into a power spectrum and selected groups of frequencies and their amplitude are compared with acceptable amplitudes for the frequencies generated by various rotating parts of the machine. When at least one of the amplitudes for different frequencies is greater than at least one of the acceptable amplitudes for the frequencies generating different rotating parts of the machine, the computer outputs an alarm signal.
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Citations
16 Claims
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1. A method of analyzing the condition of a machine with a plurality of rotating components including a freely rotating load wheel mounted to a load wheel spindle, a motor driven spindle, and a plurality of motor driven rotating grinders, said method including the steps of:
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rotating one or more of said rotating components; monitoring radial and lateral forces generated by the vibration of said one or more rotating components with load cells mounted to said load wheel spindle; inputting analog voltage signals from said load cells into a computer, said analog voltage signals corresponding to said monitored radial and lateral forces during a predetermined period of time; converting said analog signals to digital signals; converting said digital signals to a frequency domain representation; converting said frequency domain representation to a power spectrum representing the amplitudes of different frequencies; and comparing said amplitudes of different frequencies with acceptable amplitudes for selected groups of frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of analyzing the condition of a machine with a plurality of rotating components, said method including the steps of:
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rotating one or more of said rotating components; monitoring radial and lateral forces generated by the vibration of said one or more rotating components with load cells mounted to one of said rotating components; inputting analog signals from said load cells into a computer, said analog signals corresponding to said monitored radial and lateral forces during a predetermined period of time; converting said analog signals to digital signals, through an analog to digital conversion; converting said digital signals to a frequency domain representation; converting said frequency domain representation to a power spectrum representing the amplitudes of different frequencies; and comparing said amplitudes of different frequencies with acceptable amplitudes for selected groups of frequencies. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification