BEARING DEVICE VIBRATION ANALYSIS METHOD, BEARING DEVICE VIBRATION ANALYZER, AND ROLLING BEARING CONDITION MONITORING SYSTEM

• US 20150369698A1
• Filed: 12/19/2013
• Published: 12/24/2015
• Est. Priority Date: 12/25/2012
• Status: Active Grant

• Current Assignee: NTN Corporation
• Original Assignee: NTN Corporation
• Inventors: SAKAGUCHI, Tomoya, TSUTSUI, Hideyuki
• Granted Patent: US 10,337,958 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F16C 19/00 Bearings with rolling contact, for exclusively rotary movement adjustable bearings F16C23/00, F16C25/00 ; electrically insulating bearings H02K5/173
• CPC Class Codes: F16C 19/527 related to vibration and noise
• CPC Class Codes: F16C 2202/36 Piezoelectric
• CPC Class Codes: F16C 2233/00 Monitoring condition, e.g. temperature, load, vibration
• CPC Class Codes: F16C 2300/14 Large applications, e.g. bearings having an inner diameter exceeding 500 mm
• CPC Class Codes: F16C 2360/31 Wind motors in general F03D
• CPC Class Codes: G01M 13/04 Bearings
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis

Abstract

A vibration analysis method includes the steps of: inputting damage data of a rolling bearing; calculating, by a dynamics analysis program, a history of an exciting force occurring to the rolling bearing due to damage when a rotational shaft of the rolling bearing is rotated; calculating, by a mode analysis program, a vibration characteristics model of the bearing device; and calculating a vibration waveform at a predetermined position on the bearing device by applying to the vibration characteristics model the history of the exciting force calculated in the step of calculating a history of an exciting force.

Claims

1. A bearing device vibration analysis method for analyzing, by a computer, vibration of a 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 where a rolling element and a raceway surface of said rolling bearing contact each other;

calculating a history of an exciting force by a dynamics analysis program for conducting a dynamics analysis of said rolling bearing, the history of the exciting force occurring to said rolling bearing due to said damage when a rotational shaft of said rolling bearing is rotated;

calculating a vibration characteristics model by a mode analysis program for analyzing a vibration mode of said bearing device, the vibration characteristics model representing vibration characteristics of said bearing device; and

calculating a vibration waveform at a predetermined position on said bearing device by applying to said vibration characteristics model the history of the exciting force calculated in said step of calculating a history of an exciting force.

2. The bearing device vibration analysis method according to claim 1, wherein in said step of calculating a vibration waveform, said history of the exciting force is applied to at least one point on a central axis of a rotational ring of said rolling bearing in said vibration characteristics model.

3. The bearing device vibration analysis method according to claim 1, further comprising the step of determining a threshold value of a magnitude of vibration for determining that said rolling bearing is abnormal, using the vibration waveform calculated in said step of calculating a vibration waveform.

4. The bearing device vibration analysis method according to claim 1, wherein

said rolling bearing is a ball bearing, and

said step of calculating a history of an exciting force includes the steps of:

calculating, by a contact analysis program for analyzing contact between a rolling element and a raceway surface of said rolling bearing, a variation of an approach amount between said rolling element and said raceway surface caused by said given damage; and

calculating, by said dynamics analysis program, said history of the exciting force occurring to said rolling bearing due to said variation of the approach amount when the rotational shaft of said rolling bearing is rotated.

5. The bearing device vibration analysis method according to claim 1, wherein

said rolling bearing is a roller bearing,

for said dynamics analysis program, a slice method is used by which a contact load is calculated for each of minute-width sections which are obtained by slicing a contact portion between a roller and a raceway surface along an axial direction of the roller,

said bearing device vibration analysis method further comprises the step of calculating, for each slice, a variation of an approach amount between the roller and the raceway surface caused by given damage, and

said step of calculating a history of an exciting force includes the step of calculating said history of the exciting force by said dynamics analysis program for which said slice method is used.

6. The bearing device vibration analysis method according to claim 4, wherein said approach amount is an elastic approach amount.

7. The bearing device vibration analysis method according to claim 1, wherein in said step of calculating a history of an exciting force, it is supposed that a stationary ring of said rolling bearing is connected to said housing through a linear spring in a bearing radial direction at a position of a rolling element within a load-applied area.

8. The bearing device vibration analysis method according to claim 1, wherein in said step of calculating a vibration waveform, said history of the exciting force is applied to a rolling element within a load-applied area, depending on a share of a force supported by each rolling element within said load-applied area.

12. The bearing device vibration analysis method according to claim 5, wherein said approach amount is an elastic approach amount.

9. A bearing device vibration analysis method for analyzing, by a computer, vibration of a 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 where a rolling element and a raceway surface of said rolling bearing contact each other; and

calculating a vibration waveform by a dynamics analysis program, the vibration waveform occurring at a predetermined position on said bearing device due to said damage when a rotational shaft of said rolling bearing is rotated, the dynamics analysis program conducting a dynamics analysis of said rolling bearing based on a dynamics analysis model to which vibration characteristics of the rotational shaft and the housing of said rolling bearing are introduced by means of a technique which can take an elastic deformation into consideration, the technique including a mode synthesis method.

10. A bearing device vibration analyzer for analyzing vibration of a bearing device including a rolling bearing and a housing of the rolling bearing, comprising:

an input unit for inputting data about a shape of damage given to a contact portion where a rolling element and a raceway surface of said rolling bearing contact each other;

an exciting force calculation unit calculating a history of an exciting force by a dynamics analysis program for conducting a dynamics analysis of said rolling bearing, the history of the exciting force occurring to said rolling bearing due to said damage when a rotational shaft of said rolling bearing is rotated;

a vibration characteristics calculation unit calculating a vibration characteristics model by a mode analysis program for analyzing a vibration mode of said bearing device, the vibration characteristics model representing vibration characteristics of said bearing device; and

a vibration waveform calculation unit calculating a vibration waveform at a predetermined position on said bearing device by applying, to said vibration characteristics model calculated by said vibration characteristics calculation unit, the history of the exciting force calculated by said exciting force calculation unit.

11. A rolling bearing condition monitoring system comprising:

a vibration sensor for measuring vibration of a bearing device including a rolling bearing and a housing of the rolling bearing; and

a determination unit configured to determine that said rolling bearing is abnormal when a magnitude of the vibration measured with said vibration sensor exceeds a predetermined threshold value,

said predetermined threshold value being determined by using a vibration waveform calculated according to a vibration analysis method for analyzing vibration of said bearing device by a computer, and

said vibration analysis method including the steps of;

inputting data about a shape of damage given to a contact portion where a rolling element and a raceway surface of said rolling bearing contact each other;

calculating a history of an exciting force by a dynamics analysis program for conducting a dynamics analysis of said rolling bearing, the history of the exciting force occurring to said rolling bearing due to said damage when a rotational shaft of said rolling bearing is rotated;

calculating a vibration characteristics model by a mode analysis program for analyzing a vibration mode of said bearing device, the vibration characteristics model representing vibration characteristics of said bearing device; and

calculating a vibration waveform at a position where said vibration sensor is placed on said bearing device, by applying to said vibration characteristics model the history of the exciting force calculated in said step of calculating a history of an exciting force.