Consideration on Structure Vibration Isolation Asymmetry. Two Funny Cases.

Cioara, Titus Gh.; Nicolae, Ionel; Cireş, Ioan; Cristea, Dumitru; Cireș, Dragoș; Caplescu, Cristiana

doi:10.1007/978-1-4419-9831-6_27

Cited by 2 publications

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“…The dynamic response of the bucket-wheel boom substructure at the BWE ERc 1400, presented in the papers authored by the researchers from the University of Petros , ani [32][33][34][35] -due to inconsistencies in the finite element model and the model of loads caused by the forces resisting excavation-in accordance with the results of the research outlined in [3], as well as the studies published in [36][37][38][39], does not represent an accurate basis for assessing its lifespan, as presented in [35,40]. The dynamic model of the BWE slewing superstructure in the vertical plane developed by Cioara et al [41], where the main subassemblies of the load-carrying structure (bucket-wheel boom, counterweight boom and mast) were treated as rigid bodies, was used for the analysis of the BWE stability [42].…”

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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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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Vibration Control for Two Air Compressor Units Used in Tandem

Nani¹,

Ioan²

2014

WJET

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The paper presents the vibration control for two air compressors used in tandem to an oxygen generating station. The compressors are identical in terms of constructive and functional properties, and are both located on similar foundations. Each compressor is supported on a foundation made from one massive block of concrete, provided with some elastic and damping parts. This anti vibrating structure insulates the machines compared to other station equipment. During operation, were observed dangerous levels of vibration at one of the machines, which forced some unwanted stoppages for the station. Two hypotheses have been promoted. One of them referred to a pronounced wear of one compressor, although this was relatively new. The second hypothesis has taken in consideration the appearance of some cracks in the foundation massive concrete block. Experimental research conducted on the spot led to the identification of some errors done at foundation fabrication. The experimental results and some theoretical investigations are presented in this paper.

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Consideration on Structure Vibration Isolation Asymmetry. Two Funny Cases.

Cited by 2 publications

References 0 publications

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

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

Vibration Control for Two Air Compressor Units Used in Tandem

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