Vibraciones Mecanicas

27  Ahora para el tramo 2, 2 2 2 / a m s = − 2 0 0 22.2 2 2 2 2 2 1 2 22.2 .....(2 /) 2 22.2 11.1 33.3 t adt dv adt dv a t a m s t t s t t s = ⇒ = → = − = − → − = − → = ∴ + = ∫ ∫ PROBLEMA 17(13.72) En la figura, el torno T esta devanando cable a la razón constante de 2 m/s. Determinar la velocidad del contrapeso C relativa al ascensor. SOLUCIÓN:  Tenemos dos cuerdas 1 2 L y L CONSIGUE EL SOL COMPLETO DE DINAMICA RILEY DE 170 PAGINAS AL WASHAP +51954537276

This study presents the project of a portable electrodynamic shaker with permanent magnet, focused on educational applications. A one degree of freedom (DOF) model was used to analyze its vibratory characteristics. The development of the project was carried out in order to meet the application requirements and to have operational parameters similar to commercial products (manufactured abroad). A prototype was built and it had its main performance characteristics collected. The resonance frequency, the rigidity and the damping factor of the built system were measured experimentally, based on the electrical impedance curve. The acceleration curve in the frequency domain was also obtained, with the use of accelerometer. The results showed that the built shaker presents characteristics similar to those of the theoretical model, the mains differences being due, for the most part, to the nonconsideration - in the simulated model - of the influence of the coil inductance. The project met the initial requirements, being able to be used with or without a feedback control system, depending on the demanded application. Voltage and current drive were tested, and the acceleration response is found to be more homogeneous in the case of current excitation.

This paper presents a method to follow for the calculation and obtaining natural frequencies or resonance frequencies in a vehicle like is a bicycle, more specifically the mountain bike or mtb, for its acronym in English. This procedure can serve as the beginning of a form to improve design, to track a possible predictive maintenance, or simply as curiosity of how a vehicle with the naked eye so simple, it can give us much information as his form to act when it’s excited. The results shown here, is presented an economic system at the same time effective to do a vibration analysis, both sensors are used as the simplicity of the system.

Signal processing technology represents a new technique for analysing sounds in mechanical structures. The sound analyser converts an information into signals for making the process effective. Current research has focussed on comparing the performance of sound analyser with accelerometer for analysing the rotating machinery, which integrates norm of residuals and damping ratio through power spectral density behaviour to enhance an accuracy of predicting the vibration. The aim of this investigation is to determine a method to extract vibrational features with increased performance. Sound analyser technology is to be processed by using MATLAB in this project. Keywords: signal processing, accelerometer, norm of residuals, power spectral density, damping ratio, MATLAB. AIMS AND BACKGROUND Vibrational analysis is the major criteria when considering rotating shafts. Whirling is defined as the rotation of the plane made by the line of centres of the bearings and the bent shafts. As the shaft rotates in any machine tools, vibration also will exist due to an eccentricity. It causes more defects for the machine tools when an exciting frequency meets the natural frequency. So, prediction of vibration in machine tools is mandatory. Moreover, an accuracy of prediction also depends upon the selection of analysing process.