A low-cost vibration isolation chamber – Making high precision experiments accessible

Vestad, Håvard; Steinert, Martin

doi:10.1016/j.ohx.2022.e00264

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Additionally, constrained by urban land resources, high-precision laboratories are frequently located in high-tech parks adjacent to major traffic arteries, inevitably exposing them to environmental microvibrations [6,7]. Therefore, effective prediction and assessment of environmental microvibrations are crucial for ensuring the normal operation of these laboratories [8,9].…”

Section: Introductionmentioning

confidence: 99%

Environmental Microvibration Analysis Method for Vibration Isolation Research in High-Precision Laboratories

Cheng,

Lu,

Huang

et al. 2024

Buildings

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Environmental microvibrations, often originating from unidentified sources, pose a significant challenge for predicting and controlling their complex wave fields, potentially leading to measurement errors of sensitive instruments in high-precision laboratories and impacting the accuracy of experimental outcomes. Therefore, investigating effective control measures for environmental microvibrations under passive conditions is key to addressing such engineering issues. This paper presents a finite element analysis method tailored to address environmental microvibrations in the absence of apparent sources. This method involves obtaining the vibration time history at specific ground surface points through field measurements and combining the Rayleigh wave velocity attenuation character with depth at the center frequencies of one-third octave bands within the 1–100 Hz frequency range; the vibration time history at any depth in the soil is calculated. These calculated vibrations are then applied as input loads to the corresponding nodes on one boundary of the foundation–soil model, serving as the source of environmental microvibrations. The predicted results are compared with measured data and the empirical point source input method, indicating that this approach is more precise and efficient, providing valuable reference for the prediction and analysis of environmental microvibrations. In addition, utilizing this method, the study examines the effects of pile foundation parameters such as the pile length, burial depth, and concrete baseplate thickness on the vibration isolation performance of environmental microvibrations, providing guidance for designing pile foundation isolation.

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Section: Introductionmentioning

confidence: 99%

Environmental Microvibration Analysis Method for Vibration Isolation Research in High-Precision Laboratories

Cheng,

Lu,

Huang

et al. 2024

Buildings

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“…Vestad and Steinert [19] developed a simple fexible passive vibration isolation table (or mass block) suspended by four steel springs and connected by four viscous dampers. Te natural frequency of the suspended table is 1.2 Hz (in the vertical direction), and it successfully mitigates vibration responses in the frequency range of 5-20 Hz, allowing vibration-sensitive experiments or high-resolution measurements to be performed on the table.…”

Section: Introductionmentioning

confidence: 99%

Active Microvibration Control of Tool Platforms Installed on the Floors Subjected to Moving Vehicles in Industrial Factories

Lee,

Chen,

et al. 2023

Structural Control and Health Monitoring

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The vibration responses of tall flexible tool (or equipment) platforms subjected to floor excitations at the platform base are considered more crucial than those of the short ones. This study examined the microvibration control performance of the proposed active piezoelectric mass damper (APMD) or driver for tall platforms subjected to internal automated guided vehicle- (AGV-) induced floor vibrations with larger intensity and broader bandwidth in liquid-crystal-display (LCD) fabrication factories (fabs). The APMD did not require auxiliary spring and damping elements to tune the natural frequency and reduce the stroke of the mass block as required by typical active tuned mass dampers (ATMDs). The motion equation of the proposed analytical model including a continuous three-span beam (or floor) system and an active-controlled tool platform under the action of the AGV moving forces was derived. The APMD, consisting of piezoelectric stacks and a mass block, was installed on the platform subjected to the base rotation excitation, which could be attributed to the uneven vertical floor vibrations induced by AGVs. Moreover, the direct output feedback control algorithm was adopted to determine the optimal feedback gain matrix for calculating the active control force. Time history analyses of the continuous beam-platform model under different AGV weights moving at the same speed were performed, and the corresponding velocity vibration spectra of the floor and platform were further obtained through one-third octave band spectrum analysis. Numerical simulation results revealed that the microvibrations of the platform without APMD generally exceed the VC-A level regardless of the AGV weight. Significant reductions of over 90% on the platform microvibrations could be achieved after the platform was implemented with the APMD, and vibrations met the desired vibration limit (VC-B). Moreover, the APMD exhibits comparable microvibration control performance to the ATMD and requires less mass of the mass block, stroke, and applied voltage under the same active control force. In real-life high-tech production fabs, AGV-induced platform microvibrations occur all the time; therefore, the proposed APMD with less power consumption could be an economical and feasible approach for persistent microvibration control of tall platforms in LCD fabs.

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The dynamic properties and performance of the bellows-type hydraulic inerter-based dynamic anti-resonance vibration isolator

Teng,

Gao

2024

Journal of Vibration and Control

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Aiming to effectively isolate disturbance vibrations for heavy machines with low frequencies, a novel bellows-type hydraulic inerter-based dynamic anti-resonance vibration isolation (I-DAVI) isolator is proposed, which consists of a primary supporting bellows container and an additional inerter subsystem comprising horizontal bellows and inertial mass, and the incompressible oil liquid is filled in the vacuum of both bellows as the working medium. First of all, the mathematic model of the presented I-DAVI device is established, and then the vibration transmissibility for the systems under force excitation and motion excitation are derived. The relevant results indicate that the anti-resonance appears at specific frequency, creating near-zero energy transmission and significantly reducing vibration transmission to the base or machines. Through the nondimensionalization analysis, the four parameters including the inertial mass ratio, damping ratio, ratio of effective cross-section areas, and number of the inerter subsystem completely dominate the isolation characteristics of the proposed device. Subsequently, a comparison study is carried out between systems with and without inertial mass located at the end of the additional horizontal bellows, and furthermore the operating mechanism of the I-DAVI is explained clearly. It is proven that the inerter-based DAVI isolator exhibits high static and low dynamic stiffness characteristics, which cause the resonance frequency of the isolation system to shift toward lower frequency without changing the static bearing stiffness and also reduce the peak value of the transmissibility. The further numerical simulation verifies that the optimal isolation effectiveness at the anti-resonance frequency is attributed to the dynamic equilibrium between the elastic restoring force of the primary bellows and the internal hydraulic pressure. In practice, the bellows-type hydraulic inerter-based I-DAVI isolator device investigated in this study is suitable for machines with the narrowband low-frequency vibration, such as the marine turbines.

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A low-cost vibration isolation chamber – Making high precision experiments accessible

Cited by 3 publications

References 15 publications

Environmental Microvibration Analysis Method for Vibration Isolation Research in High-Precision Laboratories

Environmental Microvibration Analysis Method for Vibration Isolation Research in High-Precision Laboratories

Active Microvibration Control of Tool Platforms Installed on the Floors Subjected to Moving Vehicles in Industrial Factories

The dynamic properties and performance of the bellows-type hydraulic inerter-based dynamic anti-resonance vibration isolator

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