000004612 001__ 4612
000004612 005__ 20141119144538.0
000004612 04107 $$aeng
000004612 046__ $$k2002-06-02
000004612 100__ $$aPearson, John E.
000004612 24500 $$aDEVELOPMENT OF A FATIGUE MONITORING SYSTEM FOR A HYDRAULIC EXCAVATOR

000004612 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004612 260__ $$bColumbia University in the City of New York
000004612 506__ $$arestricted
000004612 520__ $$2eng$$aOne of the largest barge mounted hydraulic excavators in the world experienced substantial fatigue cracking during normal operation. Fatigue cracking in a similar, smaller, excavator went undetected long enough for cracks to grow to a critical length resulting in boom fracture. Because of previous cracking problems in the larger excavator, and because of expected difficult future dredging projects, the owner of the excavators sought advice to mitigate the risks associated with the fatigue problem. To better understand the stresses in the boom of the excavator, a visual examination was performed, strain gages were installed at critical locations and strains were measured during static tests and normal dredge operations. The results were used to develop a structural maintenance program, which included a permanent computer monitoring system. The computer system continuously monitored the boom strains and calculated the accumulated fatigue damage at each gage location using an approximation of the reservoir method. The system allowed engineers to determine when to schedule critical inspections. The computer system also had an alarm to warn the operator when high stresses occurred during the dredge operation. This paper presents the results of the static and dynamic testing, and the strain monitoring system.

000004612 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004612 653__ $$aExcavator, dredge, fatigue, monitoring system, reservoir method, strain gages, kips, kips per square inch (ksi)

000004612 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004612 720__ $$aPearson, John E.$$iHannen, W. Robert$$iSoderberg, Erik
000004612 8560_ $$ffischerc@itam.cas.cz
000004612 8564_ $$s2405780$$uhttps://invenio.itam.cas.cz/record/4612/files/053.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004612 962__ $$r4594
000004612 980__ $$aPAPER