Case study of the dynamic response of a medium-height building to wind-gust loading

1984 ◽  
Vol 6 (4) ◽  
pp. 256-261 ◽  
Author(s):  
T.A. Wyatt ◽  
G. Best
Keyword(s):  
Dynamic Response ◽  
Wind Gust

scholarly journals Spectral analysis of multiple cracked beam subjected to moving load

2014 ◽  
Vol 36 (4) ◽  
pp. 245-254
Author(s):  
N. T. Khiem ◽  
P. T. Hang
Keyword(s):  
Dynamic Response ◽  
Moving Load ◽  
Time History ◽  
Theoretical Development ◽  
Multiple Cracks ◽  
Spectral Approach ◽  
Cracked Beam ◽  
Time History Response ◽  
Numerical Case Study

In present paper, the spectral approach is proposed for analysis of multiple cracked beam subjected to general moving load that allows us to obtain explicitly dynamic response of the beam in frequency domain. The obtained frequency response is straightforward to calculate time history response by using the FFT algorithm and provides a novel tool to investigate effect of position and depth of multiple cracks on the dynamic response. The analysis is important to develop the spectral method for identification of multiple cracked beam by using its response to moving load. The theoretical development is illustrated and validated by numerical case study.

Dynamic Response of an Electrospun PVDF-Fe3O4 Piezoelectric Composite Microfiber

2019 ◽  
Author(s):  
Krishna Chytanya Chinnam ◽  
Arnaldo Casalotti ◽  
Giulia Lanzara
Keyword(s):  
Electric Field ◽  
Dynamic Response ◽  
Resonance Frequency ◽  
Piezoelectric Composite ◽  
Test Results ◽  
Ac Electric Field ◽  
Wide Range ◽  
Pvdf Matrix ◽  
Fine Tune

Abstract In this paper the dynamic response of an electrospun nanocomposite piezoelectric microfiber is investigated. The microfiber is formed by magnetic nanoparticles dispersed in Polyvinylidene (PVDF) matrix. Focus is given on the influence of an AC electric field on the dynamic response of the microfiber. In particular, the resonance frequency of the fiber was assessed under an increasing AC electric field at a wide range of frequencies. The electromechanical test results show that the resonance frequency of the fiber is influenced by the applied voltage and, for this case study, it decreases with increasing voltage. The results reported in this paper suggest that, once the mechanism behind such response is fully understood, composite piezoelectric microfibers can be used to fine-tune the resonance frequency of hosting devices.

Dynamic Response Analysis of a Spar Platform Subjected to Wind and Wave Forces

2008 ◽  
Author(s):  
Bernt J. Leira ◽  
Dag Myrhaug ◽  
Jarle Voll
Keyword(s):  
Dynamic Response ◽  
Roughness Parameter ◽  
Response Analysis ◽  
Wave Forces ◽  
Wind Gust ◽  
Wave Age ◽  
Spar Platform ◽  
Dynamic Response Analysis ◽  
Wind Speeds ◽  
Wind Response

Results from a study on dynamic response analysis of a floating production unit (FPSO) excited by wave and wind forces are presented. The FPSO is examplified by a Spar platform considering the motion in surge and pitch. The wind gust is modelled with the Harris [4] and Ochi and Shin [7] wind gust spectra. The effect of the wave age on the wind gust spectrum is included by adopting the Volkov wave age dependent sea surface roughness parameter [10]; the wave age independent Charnock roughness parameter [2] is also used as a reference. Examples of results demonstrate clear effects of wave age on the dynamic response. Moreover, for high mean wind speeds the total wind response is much smaller than the wave response, but for low mean wind speeds the wind appears to be more important.

Dynamic Response of Articulated Tower Platforms to Random Sea Environment

2009 ◽  
Author(s):  
Mohd Moonis Zaheer ◽  
Nazrul Islam
Keyword(s):  
Dynamic Response ◽  
Excitation Frequency ◽  
Response Analysis ◽  
Wave Forces ◽  
Wind Gust ◽  
Wave Age ◽  
Wind Speeds ◽  
Positive Side ◽  
The Mean ◽  
Low Wind Speeds

Articulated tower motions have been characterized by rigid body mode of vibrations falling in the wind excitation frequency range due to its compliant nature. Dynamic response analysis of a multi hinged articulated tower platform to random wind and wave forces are presented in this paper. The wave forces on the submerged elements of the tower are calculated by using Morison’s Equation. The fluctuating wind is modeled with Ochi and Shin wind gust spectrum. The effect of wave age (young, intermediate and fully developed waves) on the wind gust spectrum is incorporated by adopting the wave age dependent Volkov, and wave age independent Charnock sea surface roughness models. The response of the tower is determined by a time domain iterative method. An example of results demonstrates the clear effect of wave age on the nonlinear dynamic response on the system. The mean wind modifies the mean position of the surge response to the positive side, causing an offset. Moreover, for high mean wind speeds the total wind response is much smaller than the wave response, but for low wind speeds the wind appears to be more important.

scholarly journals Simulation of the Vibrations Produced to the Human Body During Operation of the Bucket Wheel Excavators. A Case Study of ERc 1400-30/7 Type Excavator

Mining Revue ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 33-49
Author(s):  
Ildiko Brînaş
Keyword(s):  
Dynamic Response ◽  
Human Body ◽  
Rotation Speed ◽  
Homogeneous Material ◽  
Hard Material ◽  
Virtual Model ◽  
Virtual Sensor ◽  
Sudden Appearance ◽  
Over Time

Abstract The paper deals with the analysis of the dynamic response over time of the excavator boom during operation. For a start, we determined the variation in time of the forces acting on the rotor shaft, due to the excavation. These forces have high values and a slow variation over time, which depends on the rotation speed of the bucket wheel and the number of buckets installed on it. A virtual model of the BWE boom was proposed, for which the dynamic response in time due to the excavation forces was determined, for a point in the main cabin of the BWE. A virtual sensor has been attached to this point corresponding to seat of the operator. The simulation of the dynamic response over time was performed taking into account a global damping of 2% of the critical damping. The simulation was performed both for the excavation of a homogeneous material and for the case of a shock (a sudden appearance of an inclusion of hard material during the cutting of the homogeneous material).

Mathematical Model of Cable Winding/Unwinding System

2017 ◽  
Vol 35 (1) ◽  
pp. 131-143 ◽  
Author(s):  
Lj. B. Kevac ◽  
M. M. Filipovic
Keyword(s):  
Mathematical Model ◽  
Dynamic Response ◽  
Experimental Analysis ◽  
Software Package ◽  
Mathematical Formulation ◽  
Theoretical Contribution ◽  
Cable Length ◽  
Simulation Results ◽  
Dynamic Variables

AbstractThe general form of mathematical model of cable winding/unwinding system is defined for several different constructions. The novelty of this mathematical model is detection and mathematical formulation of influence of new dynamic variables: winding/unwinding radius and cable length on dynamic response of cable winding/unwinding system. The validity of the obtained theoretical contribution has been illustrated through one case study by using a newly developed software package CWUSOFT which was generated in MATLAB. Theoretical and simulation results are confirmed through the experimental analysis of one novel construction of the cable winding/unwinding system.

scholarly journals Optimal design of tuned mass dampers through differential evolution method for reducing the dynamic response of structures subjected to earthquake loads

ENTRAMADO ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 244-254
Author(s):  
Daniel Alejandro Caicedo-Díaz ◽  
Luis Augusto Lara-Valencia ◽  
Yamile Valencia-González
Keyword(s):  
Optimal Design ◽  
Dynamic Response ◽  
Differential Evolution ◽  
Selection Process ◽  
Design Parameters ◽  
Tuned Mass Dampers ◽  
Ground Acceleration ◽  
Peak Displacement ◽  
Earthquake Loads

This paper introduces a methodology for the optimal design of passive Tuned Mass Dampers (TMDs) to control the dynamic response of buildings subjected to earthquake loads. The selection process of the optimal design parameters is carried out through a metaheuristic approach based on differential evolution (DE) which is a fast, efficient, and precise technique that does not require high computational efforts. The algorithm is aimed to reduce the maximum horizontal peak displacement of the structure and the root mean square (RMS) response of displacements as well. Furthermore, four more objective functions derived from multiple weighted linear combinations of the two previously mentioned parameters are also studied to obtain the most efficient TMD design configuration. A parallel process based on an exhaustive search (ES) with precision to 2 decimal positions is used to validate the optimization methodology based on DE. The proposed methodology is then applied to a 32-story case-study derived from an actual building structure and subjected to different ground acceleration registers. The best dynamic performance of the building is observed when the greatest weight is given to the RMS response of displacement in the optimization process. Finally, the numerical results reveal that the proposed methodology based on DE is effective in finding the optimal TMD design configuration by reducing the maximum floor displacement up to 4% and RMS values of displacement of up to 52% in the case-study building.

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