Failure investigation and reparation of a crack on the boom of the bucket wheel excavator ERS 1250 Gacko

Djurdjevic, Djordje; Maneski, Taško; Milošević-Mitić, Vesna; Ignjatović, Dragan

doi:10.1016/j.engfailanal.2018.05.015

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…It weights up to hundreds of tons, length up to tens of meters. Due to the poor working conditions there exist a number of complex excitations, and it is easy to cause the low-frequency vibration of the bucked wheel boom, which induces fatigue cracks and even causes serious accidents such as collapse of the whole machine [1][2][3][4][5][6]. It is for this reason that bucked wheel excavator requires serving regularly, and abnormal vibration diagnosis and repairments are often performed on the bearing structures [7,8], which has brought huge losses to the plants.…”

Section: Introductionmentioning

confidence: 99%

Low‐Frequency Vibration Testing of Huge Bucket Wheel Excavator Based on Step‐Decay Signals

Jiang

Liu

et al. 2018

Shock and Vibration

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The low-frequency vibration of the bucket wheel excavator has an important impact on the fatigue life of the structures. For conventional vibration testing methods, it is difficult and expensive to excite the overall low-frequency vibration of the whole machine. Hence, in this paper, the excitation method that uses the belt-supporting rollers on the boom as an exciter is tried to excite the low-frequency vibration, so that the low natural frequencies can be identified by Fourier transforming the free decay signals caused by the sudden power off. By this method, the first five natural frequencies are obtained, and the results are verified through corresponding computational numerical model of the bucket wheel excavator. It can be concluded that the proposed testing method can achieve the same accuracy but is much more convenient and costs less than existing methods.

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Section: Introductionmentioning

confidence: 99%

Low‐Frequency Vibration Testing of Huge Bucket Wheel Excavator Based on Step‐Decay Signals

Jiang

Liu

et al. 2018

Shock and Vibration

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“…The stress detection threshold of the Thermoelastic Stress Analysis method is important in the case of multiaxial conditions with low stress amplitude occurring in complex applications where fatigue considerations are important [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Nevertheless, stress detection threshold considerations are lacking.…”

Section: Introductionmentioning

confidence: 99%

Accuracy Evaluation of Thermoelastic Stress Analysis with the Use of Experimental and Numerical Methods

2022

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Thermoelastic Stress Analysis (TSA) is one of the very few methods allowing the determination of a continuous stress distribution on the object’s surface under variable loading conditions. Such results provide a lot of valuable information in the field of technical condition assessment and residual life prediction. In order to improve the accuracy of the TSA, the Lock-In signal processing method is implemented. This research is aimed at verifying the effectiveness of this improvement and determining the TSA stress detection threshold, as it is important information in terms of the applicability of this method in the low-stress conditions encountered in considerations of fatigue of load-carrying structures. A steel sample with a centrally located hole was subjected to cyclic loads to determine the threshold of stress detection and accuracy of TSA. As a result of the research, the relationship between the magnitude of stress excitations and the underestimation of the measured stresses was developed. Based on the conducted investigations, it was concluded that reasonable TSA results can be acquired for excitations that induce a temperature response above 10 mK (0.5 NEDT). The presented field test example proves that in industrial applications reasonable results can be acquired for thermal responses below the NEDT of the IR camera. It was concluded that it is possible to successfully implement TSA in low-stress applications (temperature response below NEDT).

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“…The issue of assessing the technical condition of industrial facilities is a problem that has been discussed in the academic community for years, where numerous approaches developed by scientists are implemented in industry [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. There are many reasons for the need to assess the technical condition of machines.…”

Section: Introductionmentioning

confidence: 99%

The Assessment of the Technical Condition of Complex Fatigued Load-Carrying Structures

Misiewicz

Więckowski

2021

Applied Sciences

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This article presents a research approach that enables the assessment of the technical condition of complex technical objects. The main emphasis is placed on the load-carrying structures of these objects. The procedure applying experimental research techniques and computer computations using the finite element method is described. The combination of the two techniques assesses the technical condition of the structure. The described approach is presented using the example of two objects.

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Failure investigation and reparation of a crack on the boom of the bucket wheel excavator ERS 1250 Gacko

Cited by 14 publications

References 15 publications

Low‐Frequency Vibration Testing of Huge Bucket Wheel Excavator Based on Step‐Decay Signals

Low‐Frequency Vibration Testing of Huge Bucket Wheel Excavator Based on Step‐Decay Signals

Accuracy Evaluation of Thermoelastic Stress Analysis with the Use of Experimental and Numerical Methods

The Assessment of the Technical Condition of Complex Fatigued Load-Carrying Structures

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