# Vibration

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Vibration Experiment Preface The mechanical vibration (Mechanical Vibration) is Oscillations (Periodic Motion) or random (Random Motion) of the mass of the mechanical system versus a balanced static system, the mechanical vibrations caused by mechanical systems (Structure or equipment), which is in a state of static equilibrium is disturbed by an external force. Resulting in the exchange of kinetic energy and potential energy between the mass and spring of the system. An example of interference in the mechanical vibration, which are wind (done with the plane, building bridges), ocean waves (done with the ship in the sea), and ground motion because of the earthquake (action and building structures). The general two kinds of vibration are free…

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weight is displaced and released, without damper the period of vibration is found to be 1.8secs, and the ratio of consecutive amplitudes is 4.2 to 1.0. Determine the amplitude and phase when the force F=2Cos3t acts on the system. ANSWER: Given: K = 525 N/m; τ = 1.8secs; x1 = 4.2; x2 = 1.0; F = F0sinωt = 2cos3t So, F0 = 2N, ω = 3 rad/sec X = (F0/K) / (√ [1 - r2] 2 + [2ζr]2) ωn = 2π/ τ = 3.49rad/sec δ = ln(4.2/1.0) = 1.435 ζ = δ / √ (4π2+ δ2) = 0.22 r = ω/ωn = 2/3.49 =…

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Auditory signals in the ranges of 20-20,000 Hz are perceivable, however, the sensitivity of human skin to the frequency of tactile signals are much lower. Generally speaking, human can perceive vibrations in the range of 20 to 1000 Hz, however, maximum sensitivity occurs in the range of 150 to 300 Hz (peak at ~250 Hz) (G. A. Gescheider, Bolanowski, Pope, & Verrillo, 2002; G. A. Gescheider, Bolanowski, & Verrillo, 2004; Gunther & O’Modhrain, 2003). The number of discrete values that can be…

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identification techniques: Extraction of the modal parameters from the response of the structure to vibration is an important step in SHM. Firstly, it gives to the engineers information about real dynamic behaviour of the structure. Secondly, designed model of the structure using computing technologies, FEM model, may be validated and optimized through comparison analytical and experimental modal parameters. The procedure developing the mathematical model of the structure on the basis of the…

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ef{tab10}, we did multiple excitations for every excitation frequency to obtain high quality estimation in Eq.( ef{eq16}) and ( ef{eq17}). egin{table}[htbp] small caption{Comparison between measured and predicted rotor free-free natural frequencies}label{tab10} centering egin{tabular}{lcc} oprule Excitation method& X& Y\ midrule Excitation in X& 1.0& 0\ Excitation in Y& 0& 1.0\ Forward and backward& 1.0& \$pm\$1.0\ Cross-coupled excitation 1& 1.0& \$pm\$0.5\ Cross-coupled excitation 2&…

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This chapter includes the design procedure for the vibration absorber system made up of SMA springs. The vibration absorber is consisting of a mass M on which we mounted a bracelet which is made up of four mass-spring-damper systems as shown in fig. two vertical and two horizontal. This system would follow the principles of inertia to counterbalance the forces of a tremor. Let’s assume, throughout a tremor the hand will moves in X and Y direction and also sometime it will rotate between X and Y…

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People may have experiences the feeling of vibration when the phone was not vibrating. According to an article, “Amazing Facts About Phone Addiction” by Jessica Jayden in 2015, this phenomenon is called phantom vibration syndrome. A phantom vibration is one of withdrawal symptoms that people, who are addicted in smartphones, practice while they are not using smartphones. The brain gives people an illusion of receiving notification from their phones. Separation from smartphones also can cause…

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The role and duty vibrations and energy play have been detrimental and essential to the world humans live in since before humans existed: 15 billion years ago. Science has shown the universe was created from a vibration; the big bang theory. A massive explosion caused by rapid movement of rising pressure resulting in the universe we live in to form. Most people do not know how important vibrations are to humans, and to everything we use and need. Sound is created from a vibration, which…

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The Responsibility Project Ethical principles contribute and can be utilized to address the organizational issues. This paper will discuss the way ethical principles get used for addressing the issues. This paper includes the information of a short film which is retrieved from the Responsibility Project web site. The paper includes several discussions which are; why are the issues in film are important? What role do external social pressures have in…

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Fluid dynamics relating to bluff bodies, non-streamlined structures or streamlined bodies at large angles of attack, remains a critical focus of study within the fluid mechanics community. One particular area of interests involves the occurrence of fluid-induced vibrations, or more commonly known as vortex-induced vibrations (VIV’s), exerted on bluff bodies. Due to the production of vortex shedding beyond bluff cross sections, an alternating pressure distribution produces periodic fluctuations…

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