scholarly journals Dynamic Properties and Energy Dissipation Study of Sandwich Viscoelastic Damper Considering Temperature Influence

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 470
Author(s):  
Yeshou Xu ◽  
Zhaodong Xu ◽  
Yingqing Guo ◽  
Xinghuai Huang ◽  
Yaorong Dong ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Dynamic Properties ◽  
Excitation Frequency ◽  
Viscoelastic Damper ◽  
Kelvin Model ◽  
Viscoelastic Dampers ◽  
Self Heating ◽  
Passive Energy Dissipation ◽  
Sandwich Type ◽  
Environmental Temperatures

Viscoelastic dampers are a kind of classical passive energy dissipation and vibration control devices which are widely utilized in engineering fields. The mechanical properties and energy dissipation capacity of the viscoelastic damper are significantly affected by ambient temperature. In this work, dynamic properties tests of the sandwich type viscoelastic damper at different environmental temperatures are carried out. The equivalent fractional Kelvin model which can characterize the mechanical behavior of the viscoelastic damper with varying frequencies and temperatures is introduced to describe the dynamic properties and energy dissipation capability of the sandwich viscoelastic damper. The self-heating phenomenon of the sandwich viscoelastic damper is studied with a numerical simulation, and the dynamic properties and energy dissipation variation of the viscoelastic damper with self-heating processes are also analyzed. The results show that the dynamic properties of the viscoelastic damper are significantly affected by temperature, excitation frequency and the internal self-generated heating.

Theoretical and Experimental Study of Viscoelastic Damper Based on Fractional Derivative Approach and Micromolecular Structures

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Yeshou Xu ◽  
Zhao-Dong Xu ◽  
Ying-Qing Guo ◽  
Teng Ge ◽  
Chao Xu ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Network Models ◽  
Regular Polyhedron ◽  
Building Structures ◽  
Viscoelastic Materials ◽  
Viscoelastic Damper ◽  
Viscoelastic Dampers ◽  
Different Temperatures ◽  
Energy Dissipation Capacity ◽  
Environmental Temperatures

Viscoelastic dampers are one of the most popular earthquake mitigation devices for building structures with a large number of applications in civil engineering. The seismic performance of viscoelastic dampers is greatly affected by viscoelastic materials. The present paper addresses the theoretical and experimental studies of the viscoelastic damper. The regular polyhedron chain network models for viscoelastic materials are proposed based on the molecular chain network microstructures and the temperature–frequency equivalent principle. Several dynamic property tests for the viscoelastic damper at different temperatures, frequencies, and displacements are carried out, and the proposed models are verified by comparing the numerical and experimental results. The comparisons show that the viscoelastic damper has perfect energy dissipation capacity, and the regular polyhedron chain network models can well describe the mechanical properties of the viscoelastic damper at different environmental temperatures and excitation frequencies.

Tests and Modeling of a New Vibration Isolation and Suppression Device

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Zhao-Dong Xu ◽  
Yeshou Xu ◽  
Qianqiu Yang ◽  
Chao Xu ◽  
Feihong Xu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Energy Dissipation ◽  
Viscoelastic Material ◽  
Vibration Isolation ◽  
Dynamic Properties ◽  
Excitation Frequency ◽  
Dynamic Responses ◽  
Damping Capacity ◽  
Air Spring ◽  
Energy Dissipation Devices

Vibration is an environmental factor with hazardous effects on the instruments' precision, structural stability, and service life in engineering fields. Many kinds of energy dissipation devices have been invented to reduce the dynamic responses of structures and instruments due to environmental excitations. In this paper, a new kind of vibration isolation and suppression device with high damping performance, fine deformation recoverability, and bearing capacity for platform structures is developed, which is designed by considering the combination of the energy dissipation mechanisms of viscoelastic material, viscous fluid, and air spring. A series of dynamic properties tests on the device are carried out under different excitation frequencies and displacement amplitudes, and a mathematical model considering the coupling effects of energy dissipation of viscoelastic material, viscous liquid, and air spring is proposed. The research results indicate that the vibration isolation and suppression device has high damping capacity, and the proposed mathematical model can well describe the mechanical properties affected by excitation frequency and displacement amplitude.

scholarly journals Fractional-Derivative Maxwell Kelvin Model for “5+4” Viscoelastic Damping Wall Subjected to Large Deformation

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Junhong Xu ◽  
Aiqun Li ◽  
Yang Shen
Keyword(s):  
Energy Dissipation ◽  
Fractional Derivative ◽  
Large Deformation ◽  
Dynamic Properties ◽  
Loss Modulus ◽  
Hysteresis Loops ◽  
Maxwell Model ◽  
Viscoelastic Damping ◽  
Building Structures ◽  
Kelvin Model

Considering the larger vibration amplitude and several viscoelastic material layers, a fractional-derivative Maxwell Kelvin (FDMK) viscoelastic mechanical model is proposed for “5+4” viscoelastic damping wall, which is used for vibration control of building structures. The development of the model is based on in-parallel combination of fractional Maxwell model and fractional Kelvin model. The proposed model is experimentally validated and very good agreement between predicted and experimental results was obtained. The results confirm that the FDMK model is accurate in simulating the hysteresis properties of the “5+4” viscoelastic damping wall under large deformation. From the areas of the experimental and theoretical hysteresis loops, under 300% strain, the predicted result is the most accurate in prediction of the energy dissipation and the second is the prediction under 450% strain. Moreover, from the comparisons of dynamic properties (storage modulus, loss modulus, etc.), the FDMK model works satisfactorily. The FDMK model is more sensitive in energy dissipation than in energy storage.

scholarly journals Experimental Study on Mechanical Properties of Small Size Viscoelastic Damper

2021 ◽  
Vol 237 ◽  
pp. 03028
Author(s):  
Miao Han ◽  
Richard Twizeyimana ◽  
Hongkai Du
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Energy Dissipation ◽  
Loss Modulus ◽  
Research Work ◽  
Loading Frequency ◽  
Viscoelastic Damper ◽  
Viscoelastic Dampers ◽  
Long Span ◽  
Roof Structure

Long span roofs are very likely to oscillate when subjected to wind load that can lead to structure fatigue and endanger structures safety. Dampers have been used for long time to dissipate wind and earthquake induced energy in structures. This research work aims to present experimental study of small size viscoelastic damper that can be installed in truss of long span roof. Small size viscoelastic dampers that can be used to dissipate wind induced energy in large span roof structure need to be tested to know their performance behavior and mechanical properties at different loading amplitudes and frequencies. A kind of viscoelastic dampers were manufactured and tested under horizontal cyclic loads. Resistance and deformation of the damper were measured to study the viscoelastic damper properties dependence on frequency and amplitude. Mechanical properties including shear storage modulus, shear loss modulus, loss factor and energy dissipation are studied. Experimental results show that the small size damper’s mechanical properties are significantly related to its loading frequency and amplitude. The energy dissipation capacity of the damper was stable under different loading frequency and amplitude.

scholarly journals Viscoelastic Material as Energy Dissipater Viscoelastic Damper for Building Structures to Mitigate the Seismic Vibration

2019 ◽  
Vol 29 (2) ◽  
pp. 41-49
Author(s):  
Waseem Sarwar
Keyword(s):  
Viscoelastic Material ◽  
Performance Index ◽  
Dynamic Properties ◽  
Loss Modulus ◽  
Excitation Frequency ◽  
Structural Response ◽  
Mechanical Analysis ◽  
Building Structures ◽  
Seismic Vibration ◽  
Viscoelastic Dampers

Abstract The supplemental energy dissipation system is a practical approach to attenuate the structural response under extreme loading. Viscoelastic damping used to reinforce the structure against the seismic vibration, Viscoelastic material (VEM) most commonly used in viscoelastic dampers (VEDs). In this paper, dynamic mechanical analysis (DMA) approach is used to investigate the performance index of VEM. It is demonstrated that the performance index, such as storage modulus, loss modulus, and loss factor decrease noticeably as the temperature increases, which reflects the low stiffness at high temperature. Excitation frequency also influenced the performance index, and the reaction has correspondence to temperature. As the temperature increases, the VEM dynamic properties decreases, which represents the rubbery region, and it is found that higher to low-temperature dynamic properties increases, which the glassy region is. DMA is a particularly flexible approach, and it characterizes the properties of VEM simultaneously at various conditions.

scholarly journals Seismic Performance of the Inerter and Negative Stiffness–Based Dampers for Vibration Control of Structures

2021 ◽  
Vol 7 ◽  
Author(s):  
Naqeeb Ul Islam ◽  
R. S. Jangid
Keyword(s):  
Energy Dissipation ◽  
Mathematical Formulation ◽  
Negative Stiffness ◽  
Optimization Approach ◽  
Comparative Performance ◽  
Viscoelastic Dampers ◽  
Passive Energy Dissipation ◽  
Recent Developments ◽  
Energy Dissipation Devices ◽  
Shear Building

Passive energy dissipation devices or supplemental damping devices have been successfully implemented into structures for controlling the excessive vibrations under wind and seismic excitation. Recent developments in the form of negative stiffness dampers (NSDs) and inerter-based vibration absorbers (IVAs) as potential energy dissipation devices are of considerable interest to researchers. The present study evaluates the performance of the combined NSD and IVA as a possible alternative to the traditional energy dissipation devices such as viscous dampers (VDs) and viscoelastic dampers (VEDs). The mathematical formulation and optimal design of the combined NSD and IVA mechanism are presented. A 20-storey benchmark building is modeled as a multi-degree-of-freedom (MDOF) shear building. The dynamic equations for the MDOF building are written in the state-space form, and a simple optimization approach based on effective modal damping is prescribed. Comparative performance between traditionally applied and novel IVA and NSD is investigated. The design considerations to analyze structures employing combined NSDs and IVAs are developed. It is demonstrated that NSDs and IVA-based passive energy dissipation devices are the most efficient devices in reducing inter-storey drifts and floor accelerations compared with VDs and VEDs using the same damping coefficient.

scholarly journals Closed-Form Solution of Road Roughness-Induced Vehicle Energy Dissipation

2018 ◽  
Vol 86 (1) ◽  
Author(s):  
A. Louhghalam ◽  
M. Tootkaboni ◽  
T. Igusa ◽  
F. J. Ulm
Keyword(s):  
Energy Dissipation ◽  
Asymptotic Analysis ◽  
Closed Form ◽  
Dynamic Properties ◽  
Mechanistic Model ◽  
Closed Form Solution ◽  
Interaction Model ◽  
Form Solution ◽  
Dissipated Energy ◽  
Road Roughness

A major contributor to rolling resistance is road roughness-induced energy dissipation in vehicle suspension systems. We identify the parameters driving this dissipation via a combination of dimensional analysis and asymptotic analysis. We begin with a mechanistic model and basic random vibration theory to relate the statistics of road roughness profile and the dynamic properties of the vehicle to dissipated energy. Asymptotic analysis is then used to unravel the dependence of the dissipation on key vehicle and road characteristics. Finally, closed form expressions and scaling relations are developed that permit a straightforward application of the proposed road-vehicle interaction model for evaluating network-level environmental footprint associated with roughness-induced energy dissipation.

Optimizing Distributed-Contact Friction in Ring Dampers

2005 ◽  
Author(s):  
X. W. Tangpong ◽  
J. A. Wickert ◽  
A. Akay ◽  
Yuri Karpenko
Keyword(s):  
Energy Dissipation ◽  
Vibration Analysis ◽  
Excitation Frequency ◽  
Contact Friction ◽  
Friction Damping ◽  
End Effects ◽  
Noise And Vibration ◽  
Disk Brake ◽  
Brake Rotors ◽  
Base Structure

This paper describes the vibration analysis and optimization of a base structure and a beam-like attached damper sub-system that couple in vibration through distributed-contact friction damping. The objective is to tune the characteristics of the damper sub-system to maximize energy dissipation, and therefore to control vibration of the base structure. Applications of the concept to noise and vibration phenomena associated with automotive disk brake rotors are discussed. Per-cycle energy dissipation is examined as a function of damper preload for two classes of sub-systems: dampers that are split rings, and dampers that are continuous rings. End-effects and the manner in which energy dissipation is distributed spatially along the damper are also discussed. Of potential technological application, for a given excitation frequency, the damper sub-system’s design can be optimized to reduce vibration of the base structure.

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