Results 291 to 300 of about 283,093 (346)
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Pneumatic suspension damping characterisation with equivalent damping ratio
International Journal of Heavy Vehicle Systems, 2012The damping property of a pneumatic suspension with orifice-type fluidic resistance is characterized in this study. The nonlinear and linear models for the suspension system are first formulated and experimentally verified. The verified linear model is employed to derive a new pneumatic damping measure, equivalent damping ratio, based on which a ...
Yin, Zhihong +4 more
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Damping-ratio measurements by the spectral-ratio method
Canadian Geotechnical Journal, 2006In this paper, bender elements are used as sensors to measure the damping ratio of soil by the spectral-ratio method. The results of numerical and physical experiments suggest that adequate measurement precision can be achieved by reducing the two types of inherent biases arising from (i) the near-field effect and (ii) the different transfer functions ...
Wang, Yu-hsing +2 more
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Proportional viscous damping model for matching damping ratios
Engineering Structures, 2020Abstract A proportional viscous damping model is proposed to address the limitations of existing models that are either inaccurate or computationally costly in matching damping ratios. The proposed model allows easy curve-fitting to a given damping ratio distribution with negligible error and is remarkably accurate for matching a constant damping ...
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Journal of the Geotechnical Engineering Division, 1977
Using the Torsional Simple Shear Device, the writers investigated the relationship between damping ratio λ\N and shear strain γ\N for Ottawa, Del Monte, Golden Gardens, and Seward Park sands. Experimental results show that the type of sand, as expressed in soil gradation and angularity, influences soil damping. However, this influence can be taken into
Mehmet A. Sherif +2 more
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Using the Torsional Simple Shear Device, the writers investigated the relationship between damping ratio λ\N and shear strain γ\N for Ottawa, Del Monte, Golden Gardens, and Seward Park sands. Experimental results show that the type of sand, as expressed in soil gradation and angularity, influences soil damping. However, this influence can be taken into
Mehmet A. Sherif +2 more
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Insights into damping ratios in buildings
Earthquake Engineering & Structural Dynamics, 2020AbstractThis paper analyzes how soil–structure interaction affects the overall damping ratio of multistory buildings and compares theoretical results with empirical data inferred from seismic responses of buildings in California. A method is presented for obtaining effective periods and damping ratios of a replacement fixed‐base multiple‐degree‐of ...
Cristian Cruz, Eduardo Miranda
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Optimal damping ratio of TLCDs
Structural Engineering and Mechanics, 2000The study of the optimal damping ratio of a tuned liquid-column damper (or TLCD) attached to a single-degree-of-freedom system is presented. The tuned liquid-column damper is composed of two vertical columns connected by a horizontal section in the bottom and partially filled with water.
Chen, Yung-Hsiang, Chao, Chen-Chi
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Damping mechanisms and damping ratios in vibrating unreinforced stone masonry
Engineering Structures, 2010Abstract In seeking to understand the dynamic behaviour of historic stone structures, eight representative walls were constructed and tested under in-plane free vibration conditions. Each wall consisted of two wythes, one sandstone, one limestone, joined by a rubble core of small stones and mortar.
Abdelsamie Elmenshawi +4 more
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First Mode Damping Ratios for Buildings
Earthquake Spectra, 2015Expressions for the expected value of the first mode damping ratio are derived by using 122 seismic responses from concrete buildings and 81 from steel. The results include dissipation at the soil-structure interface and are appropriate for situations in which this source of dissipation is not included in the model.
Dionisio Bernal +4 more
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Evaluation of Absolute Damping from Modal Damping Ratios
2004In the previous chapters, we determined the natural frequencies and modal shapes for undamped structures when modeled as shear buildings. We also determined the response of these structures using the modal superposition method. In this method, as we have seen, the differential equations of motion are uncoupled by means of a transformation of ...
Mario Paz, William Leigh
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Shear modulus and damping ratio of grouted sand
Soil Dynamics and Earthquake Engineering, 2004An experimental comparative study of three different grouted sands in terms of their effects on the values of two dynamic properties is presented. The dynamic properties studied are the shear modulus and the damping ratio which are determined with resonant column tests and cyclic triaxial tests.
Delfosse-Ribay, Estelle +3 more
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