Vibration mechanism

This paper investigates the vibration characteristics of a commonly employed mechanical structure, the cantilever beam, concerning its potential for direct electricity harvesting from piezoelectric crystals. Piezoelectric materials are renowned for their ability to generate electric charges when subjected to mechanical stress.

9p viyoko 01-10-2024 4 1   Download

This study proposes therefore to apply the transmissibility functions for modal identification of ambient vibration testing and investigates its performance in presence of harmonics. Numerical examples and an experimental test are used for illustration and validation.

14p vifilm 24-09-2024 7 1   Download

In this work, the free vibration analysis of Timoshenko microbeams made of the Functionally Graded Material (FGM) on the Winkler–Paternak elastic foundation based on the Modified Coupled Stress Theory (MCST) is investigated. Material characteristics of the beam vary throughout the thickness according to the power distribution and are estimated though Mori–Tanaka, Hashin–Shtrikman and Voigt homogenization techniques.

13p dianmotminh02 03-05-2024 9 3   Download

The sausage feeder takes an important role in automatic packaging systems. This paper presents the theoretical calculation, kinematic characteristics of an automatic sausage feeder using vibration technique and crank mechanism. The kinematics formulation of the crank mechanism is done using vector loop method and cosine rule are applied to describe the position of the mechanisms. Velocity of crank and connecting rod is performed by differentiating the position in terms of following crank angle and connecting rod angle respectively.

7p vidoctorstrange 06-05-2023 5 3   Download

This research has raised the question of whether the vibration transmission at a wall junction depends on how the wall is excited (by either a sound wave or a mechanical shaker). The aim of this research is to investigate this question and hence contribute to the revision of the series of standards. Villot and Guigou-Carter (2000) have considered this problem but their equations (10) and (13) appear to be in error. This research will endeavour to derive the correct equations and r epeat Villot and Guigou Carter’s calculations.

162p runthenight05 01-03-2023 9 3   Download

In the course of current research the procedure of obtaining of the piecewise linear vibration systems time and frequency responses have been developed. The method is partly analytical and partly numerical and is based on combining of linear solutions of different sections in a cycle of motion. In a row with the method of obtaining of the exact steady state time and frequency response, also it is provided sensitivity analysis of the vibration isolator.

86p runthenight07 01-03-2023 10 3   Download

Building models, setting up dynamic equations, vibration equations of vertical band saw blades, surveying dynamic equations, determining some optimal parameters of vertical band saws in automatic sawing lines, to improve productivity and product quality.

27p closefriend09 16-11-2021 24 4   Download

Objectives of the thesis: The literature review on the behaviours of composite beams shows that Ritz method is efficient to analyse the behaviours of composite beams with various boundary conditions, however, the number of researches used this method is still limited.

203p monsterhunterer 20-06-2021 7 2   Download

The objectives of the thesis: The thesis has developed a technique by combining the equivalent linearization method and the weighted averaging value to analyze the responses of some undamped free nonlinear vibrations.

31p extraenglish 24-05-2021 13 3   Download

The thesis has developeda technique by combining the equivalent linearization method and the weighted averagingvalueto analyze the responses of some undamped free nonlinear vibrations.

31p capheviahe29 17-03-2021 28 4   Download

The object of this thesis is to propose some beam models for static, buckling and vibration analysis of functionally graded isotropic and sandwich beams embedded in hygro-thermo-mechanical environments.

216p capheviahe28 01-03-2021 25 3   Download

Propose the global – local mean square error criterion (GLOMSEC) for Gaussian equivalent linearization method (GEL) for randomly excited MDOF nonlinear system subjected to white noise or color noise excitation. The mean square of response solution will be concentrated to evaluate the accuracy of the proposed criterion by comparison with exact solution or other accepted solutions.

28p capheviahe26 25-01-2021 11 3   Download

The study results for dynamic response of PFGCP present the effect of geometrical ratio, elastic foundations: Winkler foundation and Paskternak foundation; loads: mechanical load and thermal load; and the material properties and distribution type of porosity. The results are shown numerically and are determined by using Galerkin methods and Fourth-order Runge-Kutta method.

21p tamynhan6 14-09-2020 21 3   Download

A molecular mechanism of the [3+2] cycloaddition has been explored using various DFT theoretical levels.

8p tocectocec 25-05-2020 6 1   Download

When a satellite is in orbit, micro vibration generated by its actuators (such as reaction wheels, deployable mechanisms, etc.) will affect the imaging quality of the camera. Viscoelastic materials are utilized as passive isolators to reduce these micro vibrations due to their simple construction and excellent energy dissipation capacity.

8p tohitohi 19-05-2020 15 1   Download

The battery packs are one of the most vulnerable parts of satellites for damages induced by vibration and shock during launch process. This is due to their considerable weight which increases their susceptibility for structural damage and short connection.

6p tohitohi 19-05-2020 18 2   Download

This paper presents the effect of vibratory dissimilar TIG (Tungsten Inert Gas) welding process on hardness of welded joins with respect to change of vibratory parameters. In this study, new vibratory setup with two metal engravers is used to give mechanical vibrations to the specimens to be welded.

6p tohitohi 19-05-2020 22 1   Download

An Eddy current damper uses magnets to suppress vibrations due to external excitations. These dampers also called electromagnetic dampers, have advantages of no mechanical contact, high reliability and stability, but require a relatively large volume and mass to attain a given amount of damping.

8p tohitohi 19-05-2020 25 3   Download

Cutouts are commonly used as access port for mechanical and electrical structures. Most of the tructures generally work under severe dynamic loading and different constrained conditions during their service life. This may lead to vibration of the structure.

8p tohitohi 19-05-2020 15 4   Download

This paper presents some results on the survey of the impact of silica and black carbide on the mechanical – physical properties and vibration resistance of the rubber blended on natural rubber (NR) and synthetic styrene butadiene rubber (SBR), for application in manufacturing diesel engine mounts.

7p abcxyz123_02 03-03-2020 16 1   Download