BEARING DEVICE VIBRATION ANALYSIS METHOD, BEARING DEVICE VIBRATION ANALYZER, AND ROLLING BEARING CONDITION MONITORING SYSTEM
First Claim
1. A bearing device vibration analysis method for analyzing vibration of a bearing device by a computer, the bearing device including a rolling bearing and a housing of the rolling bearing, the method comprising the steps of:
- inputting data about a shape of damage given to a contact portion between a rolling element and a raceway surface of the rolling bearing;
calculating a displacement between an inner ring and an outer ring of the rolling bearing caused by the damage;
calculating a vibration characteristics model by a mode analysis program for analyzing a vibration mode of the bearing device, the vibration characteristics model representing a vibration characteristic of the bearing device; and
calculating a vibration waveform at a predetermined position on the bearing device by applying, to the vibration characteristics model, a history of an exciting force occurring to the rolling bearing, the history of the exciting force being obtained by multiplying the displacement calculated in the step of calculating a displacement, by a spring constant between the inner ring and the outer ring.
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Accused Products
Abstract
A vibration analysis method includes the steps of: inputting data about damage of a rolling bearing; calculating, by a dynamics analysis program, a history of a displacement between inner and outer rings occurring to the rolling bearing due to the damage when a rotational shaft of the rolling bearing rotates; calculating a vibration characteristics model of the bearing device by a mode analysis program; and calculating a vibration waveform at a predetermined position on the bearing device by applying, to the vibration characteristics model, a history of an exciting force obtained by multiplying the displacement between the inner and outer rings calculated in the step of calculating a history, by a bearing spring constant.
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Citations
19 Claims
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1. A bearing device vibration analysis method for analyzing vibration of a bearing device by a computer, the bearing device including a rolling bearing and a housing of the rolling bearing, the method comprising the steps of:
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inputting data about a shape of damage given to a contact portion between a rolling element and a raceway surface of the rolling bearing; calculating a displacement between an inner ring and an outer ring of the rolling bearing caused by the damage; calculating a vibration characteristics model by a mode analysis program for analyzing a vibration mode of the bearing device, the vibration characteristics model representing a vibration characteristic of the bearing device; and calculating a vibration waveform at a predetermined position on the bearing device by applying, to the vibration characteristics model, a history of an exciting force occurring to the rolling bearing, the history of the exciting force being obtained by multiplying the displacement calculated in the step of calculating a displacement, by a spring constant between the inner ring and the outer ring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A bearing device vibration analyzer for analyzing vibration of a bearing device including a rolling bearing and a housing of the rolling bearing, comprising:
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an input unit configured to input data about a shape of damage given to a contact portion between a rolling element and a raceway surface of the rolling bearing; a displacement calculation unit configured to calculate a displacement between an inner ring and an outer ring of the rolling bearing caused by the damage; a vibration characteristics calculation unit configured to calculate a vibration characteristics model by a mode analysis program for analyzing a vibration mode of the bearing device, the vibration characteristics model representing a vibration characteristic of the bearing device; and a vibration waveform calculation unit configured to calculate a vibration waveform at a predetermined position on the bearing device by applying, to the vibration characteristics model calculated by the vibration characteristics calculation unit, a history of an exciting force occurring to the rolling bearing, the history of the exciting force being obtained by multiplying the displacement calculated by the displacement calculation unit, by a spring constant between the inner ring and the outer ring. - View Dependent Claims (10)
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11. A rolling bearing condition monitoring system comprising:
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a vibration sensor configured to measure vibration of a bearing device including a rolling bearing and a housing of the rolling bearing; and a determination unit configured to determine that the rolling bearing has an abnormality when a magnitude of the vibration measured with the vibration sensor exceeds a predetermined threshold value, the predetermined threshold value being determined by using a vibration waveform calculated according to a vibration analysis method for analyzing vibration of the bearing device by a computer, and the vibration analysis method including the steps of; inputting data about a shape of damage given to a contact portion between a rolling element and a raceway surface of the rolling bearing; calculating a displacement between an inner ring and an outer ring of the rolling bearing caused by the damage; calculating a vibration characteristics model by a mode analysis program for analyzing a vibration mode of the bearing device, the vibration characteristics model representing a vibration characteristic of the bearing device; and calculating a vibration waveform at a placement position of the vibration sensor on the bearing device, by applying, to the vibration characteristics model, a history of an exciting force occurring to the rolling bearing, the history of the exciting force being obtained by multiplying the displacement calculated in the step of calculating a displacement, by a spring constant between the inner ring and the outer ring. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification