نتایج جستجو برای: cable vibration
تعداد نتایج: 62469 فیلتر نتایج به سال:
Vibration analysis for a cable with concentrated loads (mass) has been studied by many researchers under certain assumptions (e.g. see [1], [2]). This paper is to present an analytic method for analyzing sagged cables which have small equilibrium curvature and horizontal supports under both distributed and concentrated loads. The loads are applied at vertical as well as horizontal directions. C...
Fluid-structural coupling occurs when microcantilever sensors vibrate in a fluid. Due to the complexity of the mechanical characteristics of microcantilevers and lack of high-precision microscopic mechanical testing instruments, effective methods for studying the fluid-structural coupling of microcantilevers are lacking, especially for non-rectangular microcantilevers. Here, we report fluid-str...
the load transfer mechanisms of cable bolts differ from those for normal rebar bolts. the cable bolts used in mines are basically steel strands with different constructions depending on the number of wires or elements and the way they are laid. tendon bolts (rebar and cable) are normally evaluated for their strength and load transfer properties. the tendon strength can be evaluated by the tensi...
In order to meet the requirements of cable fault detection, a new structure of piezoelectric accelerometer was designed and analyzed in detail. The structure was composed of a seismic mass, two sensitive beams, and two added beams. Then, simulations including the maximum stress, natural frequency, and output voltage were carried out. Moreover, comparisons with traditional structures of piezoele...
A historical introduction is given of the theory of normal forms for simplifying nonlinear dynamical systems close to resonances or bifurcation points. The specific focus is on mechanical vibration problems, described by finite degree-of-freedom second-order-in-time differential equations. A recent variant of the normal form method, that respects the specific structure of such models, is recall...
Abstract Dynamics of suspended cables with active vibration control is studied. The device an electrical absorber that driven by a motor and may be fixed at any position along the cable. applies force reduces amplitude where it placed. methodology efficient for attenuating high-frequency, low-amplitude due to periodic excitation consider wind effect. dynamic behavior described mechanical model ...
Accurate estimation of the cable force affects bridges’ long-term integrity and serviceability directly. The frequency method is often used for tension testing in bridge engineering. However, generally calculation formulae are based on “ideal hinge” or fixed” boundary conditions. inclination, bending stiffness, sag-extensibility not properly considered, which results non-negligible errors. A fr...
Title of dissertation: SIMULATION MODELING OF FLIGHT DYNAMICS, CONTROL AND TRAJECTORY OPTIMIZATION OF ROTORCRAFT TOWING SUBMERGED LOADS Ananth Sridharan, Doctor of Philosophy, 2014 Dissertation directed by: Professor Roberto Celi Department of Aerospace Engineering This work presents the mathematical modeling and analysis of helicopters towing submerged loads using long cables for sub-surface o...
چکیده معضل چاقی به عنوان عارضه ای جدی برای زندگی بی تحرک و ماشینی، مورد توجه اغلب مراکز بهداشتی و درمانی دنیا قرار گرفته است. چاقی عامل زمینه ساز و در واقع عامل خطری برای بروز بیماری های قلبی - عروقی است که عموماً با کاهش طول عمر مورد انتظار و افزایش بیماری همراه است. هدف پژوهش حاضر تأثیر 12 هفته تمرینات ویبریشن کل بدن، تمرینات هوازی و تمرینات ترکیبی( هوازی و ویبریشن کل بدن) بر ترکیب بدنی زنان ...
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