Spring Failure Analysis of Mining Vibrating Screens: Numerical and Experimental Studies

Liu, Yue; Meng, Guoying; Suo, Shuangfu; Li, Dong; Wang, Aiming; Cheng, Xiaohan; Yang, Jie

doi:10.3390/app9163224

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…It was confirmed in the previous research of our team that a dynamic analysis and structural optimization can be quickly and effectively carried out using the finite element method [20,28]. For one thing, the eigenfrequencies and vibration mode of the structure can be calculated through modal analysis, which can judge whether the structure has similar eigenfrequencies and adverse vibration modes.…”

Section: Introductionsupporting

confidence: 56%

“…In the Chinese national standard GB50385-2018, Design Standards for Large Headframes in Mines, simulation methods should be used for dynamic analysis of large headframe structures in mines [19]. With the development of finite element technology, as a dynamic analysis method, the finite element method has been widely used in the fields of mechanics and architecture [20][21][22][23][24][25][26][27]. Some scholars have used the finite element method to analyze the dynamic characteristics of large headframes.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristic Analysis and Structural Optimization Design of the Large Mining Headframe

Liu

Huang

et al. 2022

Machines

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A large headframe is the core structure of a mine hoisting system. In the traditional design, only the static analysis under load is considered, resulting in the resonance phenomenon of the large headframe in later applications. In order to restrain the resonance phenomenon, a novel method for dynamic characteristic analysis and structural optimization design of a large headframe is proposed. First, the eigenfrequencies and vibration modes of the large headframe were obtained through modal analysis. The results showed that the numerical values of the multi-order eigenfrequencies of the system are relatively close. When subjected to alternating loads of similar frequencies, a large headframe is prone to the resonance phenomenon. Second, the steady-state vibration response of the large headframe was obtained through harmonic response analysis. The results showed that when the frequency of the alternating load is close to the first-order eigenfrequency, the vibration amplitude increases. Meanwhile, the fourth-order and the fifth-order eigenfrequencies are very close. When subjected to alternating loads of similar frequencies, the fourth-order and the fifth-order vibration modes of the headframe will be excited simultaneously. At this time, the headframe will have a strong resonance, which may cause structural damage and other problems. Finally, based on the above analysis, nine different structural optimization schemes are proposed in this paper. Through modal analysis and harmonic response analysis, the nine schemes were compared and analyzed, and the optimal scheme was eventually determined as scheme 9. The method proposed in this paper provides a new concept for the structural optimization design of a large mining headframe, and it has great significance for restraining the resonance phenomenon and ensuring the safety of mining operations.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristic Analysis and Structural Optimization Design of the Large Mining Headframe

Liu

Huang

et al. 2022

Machines

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“…The plant physiological symptoms of newly growing organs that were employed in the trees of temperate forests were determined [26,42] and screened for the frost-responsive period in order to determine the seven days for sampling (as they were expected to cause frost impairments). The late spring frost used to be reported as a failure of spring due to it generating large-scale greening hiatuses [26,52]. This was expected to be linked with an episode of frequent frost events in the latter stages of the days in our study in spring 2016.…”

Section: Characterization Of Frost Impairmentmentioning

confidence: 67%

Invisible Frost Stress on Introduced Dalbergia odorifera: A Bioassay on Foliar Parameters in Seedlings from Six Provenances

Li,

Liu,

Yang

et al. 2023

Sustainability

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Valuable trees are frequently taken from their original habitat and introduced to a different location in the pursuit of better economic development. Global climate change imposes a higher probability of warm spells during chilly seasons; these may increase the threat posed by frost to newly introduced, valuable species. In this study, Dalbergia odorifera was cultured as a valuable tree species that was introduced from an original provenance in Sanya (1° N) to the northern mountains in Pingxiang (22° N), Guangzhou (23° N), Zhangpu (24° N), Xianyou (25° N), and up to the northernmost limit in Wenzhou (28° N). Seedlings of these six provenances were tested in a field study conducted in Wenzhou (control) to examine their resistance to local frost stress and to detect the driving forces related to meteorological factors in the winter–spring period of 2015–2016. The leaves sampled over seven days exhibited the typical characteristics of frost impairment. The daily maximum temperature delivered warm spells, increasing by ~7 °C. The daily minimum temperature (−4.3 to −2.0 °C) did not reach freezing point until the early spring of 2016. The controlled seedlings showed lower malondialdehyde content than those from the southern locations, and no mortality occurred. Invisible frost stress was caused by low nitrogen utilization during the earlier stages during warm spells, as well as damage to membrane integrity during the later stage when the minimum temperature suddenly declined. A warm spell was found to impose a negative driving force five days before a sudden chill, which led to frost having an impact on superoxide accumulation and electrical leakage. We conclude that the D. odorifera seedlings that dwell effectively in Wenzhou obtained stronger resistance to local frost stress than those from the southern locations. Low cell membrane integrity and high electrical leakage in leaf cells accounted for the frost damage.

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“…However, they are not suitable for high-efficiency and high-speed machines and systems, especially in the military and aerospace fields with strict working conditions, because the mechanical springs may suffer from failures including fatigue fracture, plastic deformation, stress relaxation, and tilt stuck. 1,2 With the emergence of rare earth permanent magnets such as NdFeB, permanent magnetic spring (PMS) are becoming more and more attractive. Compared with traditional mechanical spring, PMS not only has the advantages of no mechanical contact, no wear, no friction, and good working stability, 3 but also does not have fatigue failure, so it has almost infinite life.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization design of novel differential permanent magnet spring based on analytical modeling

Zhu

Zhang

Meng

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper proposes a novel structure of annular differential permanent magnet spring with an octagonal moving ring and its multi-objective optimization design procedure based on analytical modeling. Compared with the typical annular differential permanent magnet spring with rectangular cross-section, this novel configuration has larger stiffness, smaller volume, and can effectively save permanent magnet materials. Based on the analytical modeling of the rectangular cross-section magnetic ring, the theory of attraction-repulsion boundary line is proposed, which is used to determine the key dimensions and optimal cross-section shape of the octagonal moving ring and is verified by the FEM simulation afterward. The octagonal moving ring is further decomposed into several types of basic permanent magnet elements to obtain their respective analytical expressions, which are then re-superimposed into the whole octagon to obtain the analytical force-displacement equation of the whole spring. Based on the analytical modeling, a multi-objective optimization procedure is performed to optimize the design parameters in order to balance the different performance requirements. The Pareto front of the desired objectives are obtained and three weighed solutions in Pareto front are selected by analytic hierarchy process. Finally, three prototypes based on the final optimization results are manufactured and tested. The experimental results verify the correctness of the design theory and optimization process.

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Spring Failure Analysis of Mining Vibrating Screens: Numerical and Experimental Studies

Cited by 11 publications

References 33 publications

Dynamic Characteristic Analysis and Structural Optimization Design of the Large Mining Headframe

Dynamic Characteristic Analysis and Structural Optimization Design of the Large Mining Headframe

Invisible Frost Stress on Introduced Dalbergia odorifera: A Bioassay on Foliar Parameters in Seedlings from Six Provenances

Multi-objective optimization design of novel differential permanent magnet spring based on analytical modeling

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