نتایج جستجو برای: mechanical vibrations
تعداد نتایج: 250112 فیلتر نتایج به سال:
Self-excited vibrations are developed when mechanical system includes internal or external source of energy, which gives energy equal or larger than energy loss [1-5]. The same source of energy, which keeps vibrations in order is permanent. The system makes sure that the energy inflow from permanent source through internal energy converter, which is a part of a feedback. Frequency of energy inf...
This paper presents the vibration pattern measurement of two tower-typed holonomic mobile robot prototypes: one based on a rigid mechanical structure, and the other including a passive suspension system. Specific to the tower-typed mobile robots is that the vibrations that originate in the lower part of the structure are transmitted and amplified to the higher areas of the tower, causing an unp...
It has recently been proposed that the effects of structural vibrations on the radiated sound of brass wind instruments may be attributable to axial modes of vibration with mode shapes that contain no radial nodes [Kausel, Chatziioannou, Moore, Gorman, and Rokni, J. Acoust. Soc. Am. 137, 3149-3162 (2015)]. Results of experiments are reported that support this theory. Mechanical measurements of ...
In this work, different modelling aspects of helicopter aerodynamics are discussed. The helicopter model is on Sikorsky configuration, main rotor in perpendicular combination with a tail rotor. The rotors are articulated and their blades are rigid. The main rotor implementation takes into account flap, lag and feather degrees of freedom for each of the equispaced blades as well as their dynamic...
The issue of the influence of wall vibrations on the behavior of wind instruments is still under debate. The mechanisms of vibroacoustic couplings involved in these vibrations are difficult to investigate, as fluid-structure interactions are weak. Among these vibroacoustic interactions, the present study is focused on the coupling between the internal acoustic field and the mechanical behavior ...
Mechanical vibrations induced in flexible structures such as beams and plates have been researched through various optimization functions and control theories to optimize transient response dynamic characteristics. Piezoelectric materials sensors/actuators have been used to reduce and control these vibrations. However, stiffened plate has not been investigated and it is a main and important par...
Although the incidence of floor vibration problems appears to be on the rise, the use of mechanical damping devices to control vibrations is limited. In a recent survey of vibration control methods, Murray reports that passive-mechanical damping methods, including viscous damping, visco-elastic damping, and tuned-mass dampers, have often gone untried outside the laboratory or have had marginal ...
Monitoring of vibrations of surfaces is of great interest for many potential applications [1-61. The importance of optical techniques for determination of vibration analysis of mechanical structures stem froin the fact that they enable ineasureinent of vibrational motion without mechanical contact. Optical techniques caii be employed to measure the vibrations of objects s idi as aeroplanes, aut...
Bone formation and resorption are sensitive to both external loads arising from gravitational loading as well to internal loads generated by muscular activity. The question as to which of the two sources provides the dominant stimulus for bone homeostasis and new bone accretion is arguably tied to the specific type of activity and anatomical site but it is often assumed that, because of their p...
The passage of cosmic rays has been observed to excite mechanical vibrations in the resonant gravitational wave detector NAUTILUS operating at temperature of 100 mK. A very significant correlation (more than 10 standard deviations) is found.
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