Method and Device Displaying Material Fatigue of Machine

• US 20160320262A1
• Filed: 03/03/2014
• Published: 11/03/2016
• Est. Priority Date: 03/03/2014
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: UNUMA, Munetoshi, YUDA, Shinya, SAEKI, Takashi, SUZUKI, Hideaki
• Granted Patent: US 10,620,082 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence
• CPC Class Codes: G01M 5/0033 by determining damage, crack or wear

Abstract

An objective of the present invention is to associate condition information, such as (a) a location in a movement section at which fatigue occurred, (b) a type of work or operation during which fatigue occurred, and (c) a type of natural phenomenon experienced when fatigue occurred, with machine fatigue occurring when a machine is moved or placed in a work environment, natural environment, or other condition and to visualize and display the machine fatigue. To achieve this objective, this device for displaying the material fatigue of a machine is characterized by being provided with a means for observing stress variation in a time series using a sensor correlated with the stress variation or stress of a machine, a means for detecting stress variation in a single cycle, and a means for detecting the time when the stress variation occurred, and by outputting or displaying the stress variation value and time of occurrence.

Claims

1. A device for displaying material fatigue of a machine comprising:

means for observing time series variation of stress by using a sensor associated with stress variation or the stress of a machine;

means for detecting stress amplitude; and

means for detecting an occurrence time of the stress variation,

wherein the device outputs a value and the occurrence time of the stress variation.

4. The device for displaying material fatigue of a machine according to claim 1,

wherein the stress variation is repeated stress variation of a single cycle, converted into fatigue damage of the single cycle according to the variation, and output or displayed.

2. A device for displaying material fatigue of a machine comprising:

means for observing time series variation of stress by using a sensor associated with stress variation or the stress of a machine;

means for detecting stress amplitude; and

means for detecting a starting time and an ending time of the stress variation,

wherein the device outputs a value and the starting time and the ending time of the stress variation.

3. A device for displaying material fatigue of a machine comprising:

means for observing time series variation of stress by using a sensor associated with stress variation or the stress of a machine;

means for detecting stress amplitude; and

means for detecting a starting time, an ending time, and a pole value occurrence time of the stress variation,

wherein the device outputs a value and the starting time, the ending time, and the pole value occurrence time of the stress variation.

5. A device for displaying material fatigue of a machine,

wherein the device obtains single cycle fatigue damage by dividing fatigue damage of a single cycle by a time difference between a starting time and an ending time of stress variation,

obtains time series fatigue damage velocity added on a time axis with fatigue damage velocity obtained from another single cycle fatigue damage, and

outputs the time series fatigue damage velocity together with the time axis.

7. The device for displaying the material fatigue of a machine according to claim 5,

wherein the device represents the amount of the fatigue damage accumulated until the current time by integrating the fatigue damage of the single cycle.

6. A device for displaying material fatigue of a machine,

wherein the device associates means for observing a state of a machine in a time series manner with stress variation, fatigue damage of a single cycle, or time series fatigue damage velocity based on time information, and outputs the stress variation, the fatigue damage of the single cycle, or the time series fatigue damage velocity, associated with state variation information of the machine.