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

Jiang, Yupeng; Liu, C. J.; Li, X. J.; He, Kuanfang; Xiao, Dongming

doi:10.1155/2018/6182156

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…The accelerations and displacement for all direction, as resulted from simulation, are shown in Figures 21 and 22. The accelerations obtained after the analysis are also close to accelerations measured experimentally in [58][59][60]. The dominant displacement appears in the vertical plane with the resultant average amplitude of 5.2 mm and a corresponding frequency of approximately 2 Hz.…”

Section: Time Response Analysis Of the Bwe Boom Modelsupporting

confidence: 82%

Prediction of Material Failure Time for a Bucket Wheel Excavator Boom Using Computer Simulation

et al. 2021

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Breakdown of stackers and excavators in opencast mines is possible because of operating, manufacturing and structural causes, and it produces high financial losses. These can be prevented by using various measures, including analyses and strength tests, with computerized modeling and simulation using FEA or other techniques being implemented in the recent years. In this paper a fatigue study is conducted on the boom of a BWE. Based on a computer model of the boom previously developed in SOLIDWORKS by our author team, first the modal analysis is conducted for three positions of the boom by studying the frequency response during the excavation process. This is followed by the time response determination corresponding to the maximum displacement frequency, in order to assess the stress during the excavation process, which causes the material fatigue in the boom structure. It was found that the maximum displacements appear when the BWE boom operates in a horizontal position. The aim was to estimate the period of time to failure in order to prevent unwanted accidents, and to develop a method that is applicable to any surface mining or industrial machine with similar structure.

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Section: Time Response Analysis Of the Bwe Boom Modelsupporting

confidence: 82%

Prediction of Material Failure Time for a Bucket Wheel Excavator Boom Using Computer Simulation

et al. 2021

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“…where β is the attenuation coefficient. Equation (11) implies that increasing the distance between the measuring point on the rotary platform and the excitation source will produce a smaller amplitude of the frequency response function and enhance the amplitude of vibration attenuation.…”

Section: Analysis Of Vibration Transfer Characteristicsmentioning

confidence: 99%

“…Zheng et al [10] dealt with the modeling and analysis of random vibration tests with six degrees of freedom, involving an advanced multi-input/ multioutput system in which three translational and three rotational motions could be simultaneously controlled. Jiang et al [11] provided an alternative method for testing the lowfrequency vibration of a huge bucket-wheel excavator and obtained accurate estimates of the low natural frequencies of the bucket-wheel excavator. Hydraulic excavators are a complex vibration system; therefore, experimental investigations are important to reveal their vibration characteristics.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experimental Investigation of Vibration Characteristics of Rotary Platform of Hydraulic Excavator under Complex Working Conditions

Liu

et al. 2021

Shock and Vibration

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The rotary platform is the load-bearing substrate of a hydraulic excavator. The dynamic characteristics of the rotary platform directly affect the reliability and safety of the whole machine of a hydraulic excavator. In this work, the characteristics of the main external excitations acting on the hydraulic excavator such as the engine excitation, pressure pulsation excitation of the piston pump, inertial excitation of the working device, and road excitation are analyzed. The vibration transmission paths under the action of external excitations are ascertained. A vibration test method for the rotary platform of the hydraulic excavator is proposed. The vibration characteristics of the rotary platform under complex working conditions are researched, and the internal relationships between the vibration characteristics of the rotary platform and the engine excitation, pressure pulsation excitation of the piston pump, and road excitation are analyzed experimentally. The results show that the rotary platform is subjected to different excitations when it is under different working conditions. Moreover, the internal relationships between the dynamic characteristics of the rotary platform and the external excitation characteristics can be discovered by analyzing the vibration signals of the rotary platform, and the dynamic characteristics of the whole machine of the hydraulic excavator can be deeply studied based on the vibration characteristics of the rotary platform.

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“…During the experimental studies on the spectrum of natural frequencies of the structure of the BWE SchRs 1320, Gottvald solved the problem of generating the excitation impulse of the appropriate energy [26] by severing the rope used to hang the weight (mass of 26.4 t) from the first frame of the bucket-wheel boom [27,28]. The studies in [27,29] present the results of comparative analyses of the numerically and experimentally determined natural frequency spectrum of the BWE structure, also accounting for cases when the bucket wheel was supported on the bench face.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Dynamic Response as a Basis for the Efficient Protection of Large Structure Health Using Controllable Frequency-Controlled Drives

2022

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Continuous earthmoving machines, such as bucket-wheel excavators (BWEs), are the largest mobile terrestrial machines exposed to the working loads of a periodic character. This paper aims to launch a new idea regarding the preservation of the load-carrying structures of these machines by the means of implementing a controllable frequency-controlled drive of the excavating device. Successful implementation of this idea requires a detailed analysis of the dynamic response of the load-carrying structure in order to determine the domains of frequency of revolutions of the bucket-wheel-drive electromotor (FREM) where the dynamic response of the structure is favorable. The main goal of the presented research was the development of a unique three-step method for the identification of the FREM ranges, where the vibroactivity of the load-carrying structure is within the allowed boundaries. A methodologically original study of the dynamic response was conducted on a unique dynamic model of the BWE slewing superstructure that allows for continuous variation of the FREM, i.e., of the frequency of excitation caused by the forces resisting the excavation. Validation of the spatial reduced dynamic model of the slewing superstructure and the corresponding mathematical model, as well as the overall approach to the determination of the dynamic response, were performed by the means of vibrodiagnostics under the real exploitation conditions. Application of the developed method has yielded: (1) the resonant-free FREM domains; (2) the FREM domains, where the structure is not exposed to the excessive dynamic impacts; and (3) the frequency ratio ranges defining the resonant areas. Additionally, the results of the research have pointed out that the resonant-free state represents a necessary but insufficient condition for the proper dynamic behavior of the BWE slewing superstructure.

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

Cited by 5 publications

References 15 publications

Prediction of Material Failure Time for a Bucket Wheel Excavator Boom Using Computer Simulation

Prediction of Material Failure Time for a Bucket Wheel Excavator Boom Using Computer Simulation

Analysis and Experimental Investigation of Vibration Characteristics of Rotary Platform of Hydraulic Excavator under Complex Working Conditions

Analysis of the Dynamic Response as a Basis for the Efficient Protection of Large Structure Health Using Controllable Frequency-Controlled Drives

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