Energy Transfer of an Axially Loaded Beam With a Parallel-Coupled Nonlinear Vibration Isolator

Lu, Ze-Qi; Liu, Wen-Hang; Ding, Hu; Chen, Liqun

doi:10.1115/1.4054324

Cited by 49 publications

(7 citation statements)

References 32 publications

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“…As a result, it began to decline rapidly and eventually became negative. This material exhibited metallic behavior at negative values of the real dielectric function (ε 1 (ω)); else it is dielectric [33]. Different optical characteristics as like refractive…”

Section: Optical Properties Of Compoundsmentioning

confidence: 99%

Lithium-based perovskites materials for photovoltaic solar cell and protective rays window applications: a first-principle calculations

et al. 2023

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Perovskites are the key enabler materials for the solar cell applications in the achievement of high performance and low production costs. In this article, the structural, mechanical, electronic, and optical properties of rubidium-based cubic nature perovskite LiHfO3 and LiZnO3 are investigated. These properties are investigated using density-functional theory with the aid of CASTEP software by introducing ultrasoft pseudo-potential plane-wave (USPPPW) and GG-approximation-PB-Ernzerhof exchange–correlation functionals. It is investigated that the proposed compounds exhibit stable cubic phase and meet the criteria of mechanical stability by the estimated elastic properties. Also, according to Pugh's criterion, it is noted that LiHfO3 is ductile and LiZnO3 is brittle. Furthermore, the electronic band structure investigation of LiHfO3 and LiZnO3 shows that they have indirect bandgap (BG). Moreover, the BG analysis of the proposed materials shows that these are easily accessible. Also, the results for partial density of states (DOS) and total DOS confirm the degree of a localized electron in the distinct band. In addition, the optical transitions in the compounds are examined by fitting the damping ratio for the notional dielectric functions scaling to the appropriate peaks. At absolute zero temperature, the materials are observed as semiconductors. Therefore, it is evident from the analysis that the proposed compounds are excellent candidates for solar cells and protective rays applications.

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Section: Optical Properties Of Compoundsmentioning

confidence: 99%

Lithium-based perovskites materials for photovoltaic solar cell and protective rays window applications: a first-principle calculations

et al. 2023

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“…WRIs are effective as base isolation of lightweight structures against seismic excitations in the small and relatively large displacement ranges. Furthermore, Lu et al [24] studied the combination of linear with nonlinear isolators to improve low-frequency isolation and found this to be effective in vibration isolation. Hence, their study showed that there is also a possibility of combining isolators to obtain enhanced characteristics.…”

Section: Review Of Previous Studies On Wrismentioning

confidence: 99%

Wire Rope Isolators for the Vibration Protection of Heavy Equipment: Exploratory Research

2022

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Wire rope isolators (WRI) are devices that dissipate vibrational energy. They are used in various industrial applications to protect equipment and machinery. Heavy machinery and limited space are still some of the constraints engineers face when designing the WRI system. Heavy equipment requires increased vertical stiffness; however, using larger WRIs decreases their lateral flexibility, which is the target property in the first place. Using several small-sized WRIs is not possible in the case of limited space. Therefore, the present study proposes two improvements to WRIs to overcome the challenges caused by heavy-weight equipment and a lack of the space required to insert the appropriate number and size of WRIs. Two new configurations for WRIs are proposed, Spring-WRI (S-WRI) and Double-WRI (D-WRI), to improve the stiffness and damping properties in order to expand their applications. Monotonic and quasi-static cyclic loading tests were performed on the conventional and proposed WRI variants. Exploratory tests showed that the WRI’s stiffness greatly depends on the wire rope diameter. Adding springs inside a conventional WRI (S-WRI) can improve vertical stiffness while maintaining the required lateral flexibility. The D-WRI was found to preserve the necessary flexibility and to be capable of solving the problem of limited space. The hysteresis behavior of the D-WRI can be expressed as the sum of the hysteresis of each WRI. The proposed configurations effectively improve the stiffness and damping properties of WRIs and expand their applicability for the vibration isolation of heavy equipment and in limited space.

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“…Quasi-zero stiffness (QZS) isolators with high-static-lowdynamic stiffness have received a lot of attention. [8][9][10][11][12][13] QZS isolators have good low-frequency vibration isolation performance, due to their good load-bearing performance and low natural frequency. Yan et al 14 used hardening stiffness for nonlinear compensation to obtain QZS.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Resonance Suppression Performance of a Time-Varying Isolation Platform

Wang,

Liu,

Pan

2024

The International Journal of Acoustics and Vibration

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Expanding the low-frequency isolation range and suppressing the amplitude in the resonant region are important goals for vibration isolation in recent years. Various quasi-zero stiffness isolators and active isolators have emerged, achieving the expansion of the isolation range to low frequency. However, resonance suppression performance is limited by the damping structure and damping materials, making it difficult to achieve the ideal damping ratio. To simultaneously expand the low-frequency isolation range and suppress resonance, a time-varying isolation platform is proposed based on the resonant energy dispersion phenomenon of a time-varying structure. A finite element (FE) model of a fixed isolation platform is established to verify the low-frequency isolation range. One of the isolators slides along the flexible plate that changes the inherent characteristics of an isolation system which can suppress the formation of resonance. The effects of the time-varying path, damping and isolator stiffness on the amplitude in the resonant region are analyzed. The results demonstrate that the time-varying isolation platform not only has lower resonant frequency, but also can suppress the resonance peak to disperse the resonance energy in situations where system parameters are unidentified. The time-varying isolation platform provides a new approach for low frequency vibration isolation.

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Energy Transfer of an Axially Loaded Beam With a Parallel-Coupled Nonlinear Vibration Isolator

Cited by 49 publications

References 32 publications

Lithium-based perovskites materials for photovoltaic solar cell and protective rays window applications: a first-principle calculations

Lithium-based perovskites materials for photovoltaic solar cell and protective rays window applications: a first-principle calculations

Wire Rope Isolators for the Vibration Protection of Heavy Equipment: Exploratory Research

Analysis of Resonance Suppression Performance of a Time-Varying Isolation Platform

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