نتایج جستجو برای: vibration analysis eigensolution

تعداد نتایج: 2861202  

2017
Shigenori Yokoshima Takashi Morihara Tetsumi Sato Takashi Yano

The Shinkansen super-express railway system in Japan has greatly increased its capacity and has expanded nationwide. However, many inhabitants in areas along the railways have been disturbed by noise and ground vibration from the trains. Additionally, the Shinkansen railway emits a higher level of ground vibration than conventional railways at the same noise level. These findings imply that bui...

2010
Gorik De Samblanx Karl Meerbergen Adhemar Bultheel

The implicitly restarted Arnoldi method implicitly applies a polynomial lter to the Arnoldi vectors by use of orthogonal transformations. In this paper, an implicit ltering by rational functions is proposed for the rational Krylov method. This ltering is performed in an eecient way. Two applications are considered. The rst one is the ltering of unwanted eigenvalues using exact shifts. This appr...

2006
Yusaku Yamamoto

Computation of eigenvalues and eigenvectors of a dense symmetric matrix is one of the most important problems in numerical linear algebra. In applications such as molecular orbital methods and first-principles molecular dynamics, eigensolution of matrices of order more than 10,000 is now needed. One of the approaches to solve such a large problem in practical time is to use symmetric multi-proc...

Journal: :ماشین های کشاورزی 0
علی سفرنگیان لیلا ندرلو حسین جوادی کیا مصطفی مصطفایی سید سعید محتسبی

introduction vibrations include a wide range of engineering sciences and discuss from different aspects. one of the aspects is related to various types of engines vibrations, which are often used as power sources in agriculture. the created vibrations can cause lack of comfort and reduce effective work and have bad influence on the health and safety. one of the important parameters of the diese...

2010
Joshua Isom Madhusudana Shashanka Ashutosh Tewari Aleksandar Lazarevic

Probabilistic latent component analysis (PLCA) is applied to the problem of gearbox vibration source separation. A model for the probability distribution of gearbox vibration employs a latent variable intended to correspond to a particular vibration source, with the measured vibration at a particular sensor for each source the product of a marginal distribution of vibration by frequency, a marg...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2013
Jérémy Le Deunff Amaury Mouchet Peter Schlagheck

Resonance-assisted tunneling is investigated within the framework of one-dimensional integrable systems. We present a systematic recipe, based on Hamiltonian normal forms, to construct one-dimensional integrable models that exhibit resonance island chain structures with accurately controlled sizes and positions of the islands. Using complex classical trajectories that evolve along suitably defi...

2008
Dmitry Litvinov

In this article the analysis of signals from vibration sensors in a high-frequency range is presented, and also conclusions about advantages of high-frequency vibration analysis at vibration diagnostics of planetary reduction gearmotors are done. 1. INTRODUCTION Due to wide kinematics possibilities, economy, reliability, small size, low noise level, planetary reduction gearmotors are found wide...

This paper presents the analysis of vibration control of a laminated composite beam that including magnetostrictive layers. The formulation of problem is presented based on the shear deformation beam theory. For vibration suppression, the velocity feedback control with constant gain distributed is considered. Navier's method is applied to analyze the solution of vibration suppression of laminat...

2017
S. Abdi D. X. Llano E. Abdi R. A. McMahon

In this work, a large-scale Brushless Doubly Fed Machine (BDFM) built in frame size D400 is tested at different operating conditions in order to examine its noise and vibration levels. A series of measurements were conducted on the machine to establish the main modes of excitation of vibration and noise developed by the machine. The harmonic spectrums of the vibration amplitudes are presented a...

2000
Louis Komzsik

The Lanczos eigensolution takes the dominant amount of time in most normal modes and modal frequency response analyses. This paper introduces a way to reduce the elapsed time of large eigenvalue jobs by using a newly developed parallel option within the Lanczos algorithm. We will compare the performance of the frequency domain decomposition based distributed memory parallel method introduced in...

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