US 11,814,818 B2
Fatigue management system
Keita Ogasawara, Ibaraki (JP); Akio Hoshi, Ibaraki (JP); Shunichi Suda, Ibaraki (JP); Hiroshi Kanezawa, Chiba (JP); and Takeshi Shiina, Ibaraki (JP)
Assigned to Hitachi Construction Machinery Co., Ltd., Tokyo (JP)
Appl. No. 17/435,896
Filed by Hitachi Construction Machinery Co., Ltd., Tokyo (JP)
PCT Filed Sep. 30, 2019, PCT No. PCT/JP2019/038470
§ 371(c)(1), (2) Date Sep. 2, 2021,
PCT Pub. No. WO2021/064776, PCT Pub. Date Apr. 8, 2021.
Prior Publication US 2022/0178115 A1, Jun. 9, 2022
Int. Cl. E02F 9/26 (2006.01); G06T 7/00 (2017.01)
CPC E02F 9/267 (2013.01) [E02F 9/265 (2013.01); G06T 7/0004 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A fatigue management system comprising:
a controller configured to receive an output of a sensor attached to a part of a construction machine; and
an image display configured to display an image, wherein
the controller includes:
a stress calculation section configured to calculate stress acting on a plurality of portions of the construction machine based on the output of the sensor;
a damage degree calculation section configured to calculate cumulative damage degree of each portion based on the stress;
an index value calculation section configured to calculate a fatigue index value, which is a weighted degree of the cumulative damage degree and which is a value that varies in degree of change with respect to an increase of the cumulative damage degree, for each portion; and
an image generator configured to generate an image of various portions of the construction machine in association with the fatigue index values, wherein
the image display is further configured to display the image of various portions of the construction machine in association with the fatigue index values.
 
5. A fatigue management system comprising:
a server that performs date communication with a construction machine;
a memory device that is connected to the server; and
an image display that displays an image, wherein the server and the memory device include
a stress calculation section configured to calculate stress acting on a plurality of portions of the construction machine based on an output of a sensor attached to a part of the construction machine;
a damage degree calculation section configured to calculate cumulative damage degree of each portion based on the stress;
an index value calculation section configured to calculate a fatigue index value, which is a weighted degree of the cumulative damage degree and which is a value that varies in degree of change with respect to an increase of the cumulative damage degree, for each portion; and
an image generator configured to generate an image of various portions of the construction machine in association with the fatigue index values, wherein
the image display configured to display the image of various portions of the construction machine in association with the fatigue index values.