2 edition of Dynamic response of flexible rotating machines subjected to ground motions found in the catalog.
Dynamic response of flexible rotating machines subjected to ground motions
Written in English
|Statement||by Wen-Chyi Su.|
|The Physical Object|
|Pagination||72 leaves, bound. :|
|Number of Pages||72|
The aim is to present a transmission on non-linear shafts-coupling model subjected to elastic deformation. In the secondary beam mode, the primary beams form nodal lines, i. Clearly a similar problem can emerge for very high stability antennas. Damping depends on the finishes on the structure and an appropriate value will generally have to be assumed based on past experience or testing.
There are two types of modal test. Clearly a similar problem can emerge for very high stability antennas. FFT as well reflected the synchronous excitation frequencies due to the unbalance effect. Finite element analysis A typical output from a modal finite element analysis of a building is shown. The combined effect of unbalance forces, base motion excitation, and contact non-linearity on a rotor—AMB system response is analyzed focusing on the capacity of an augmented proportional-integral-derivative controller to maintain the system stable. Introduction The study of vibratory behaviour of connected shafts covers several branches of mechanics and mathematics.
For a given floor, the software will generate as many of these plots or modeshapes as required, together with the corresponding natural frequency and modal mass. The study of the influence of both unique and combined faults in the structure connected by a universal joint is therefore important. The two main codes used in the UK which cover floor vibrations are: ISO  Bases for design of structures - Serviceability of buildings and walkways against vibrations BS  Guide to evaluation of human exposure to vibration in buildings. Assessment of floor vibrations from SCI P Note: Section numbers refer to those in SCI P The design procedure comprises the following steps: Typical mode shapes for steel-concrete floor systems Calculation of natural frequency Evaluation of the critical acceleration and hence response factor Checking the response factor against the acceptance criteria for continuous vibration. Professor John E.
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Finite element analysis A typical output from a modal finite element analysis of a building is shown. For a given floor, the software will generate as many of these plots or modeshapes as required, together with the corresponding natural frequency and modal mass.
These may be superimposed on the floor plan in order to visually identify any potential problem areas. He is a regular reviewer of many technical journals and is currently on the editorial boards of the Journal of Dynamic response of flexible rotating machines subjected to ground motions book and Vibration and Communications on Numerical Methods in Engineering.
He is a regular reviewer of many technical journals and is currently on the editorial boards of the Journal of Sound and Vibration and Communications on Numerical Methods in Engineering. The validity of this assumption is examined here using 3D computer models of single-story structures having symmetric torsionally stiff and asymmetric torsionally flexible layouts subjected to an ensemble of near-fault ground motions with and without apparent velocity pulses.
Such microvibrations can be of concern for experiments requiring zero gravity conditions or for telescopes where jitter can disturb the pictures. First, a transmission model is proposed, and a new model for unbalanced faults associated with shaft motions is presented.
Lees has spent most of his career in the power generation industry. Geological Survey Open-File Report —, 81 p. Professor Seamus D.
In the primary beam mode, the primary beams vibrate about the columns as simply-supported members and the secondary beams and slab are taken to be fixed-ended. The probability of a fault in the universal joint, causing errors in the engine and transmission is higher than in other parts of a vehicle .
His research interests include topics in structural dynamics and rotordynamics. Some of the devices under development that can be used to suppress these unwanted vibrations are outlined. Frequency weighting curves for human beings exposed to whole-body vibration are included, together with advice on measurement methods to be employed.
By repeating this process for a number of frequencies and plotting the recorded amplitudes against the frequencies for each test point, it is possible to estimate likely natural frequencies of the floor. This is because the lack of force measurement requires a number of assumptions to be made to enable extraction of modal properties; incorrect assumptions can lead to significant errors.
FFT as well reflected the synchronous excitation frequencies due to the unbalance effect. Issue Section:. In this case, the aim of the test will be to measure directly the acceleration caused by a realistic excitation event. These are shown in the table below. For any structure, there are an infinite number of modes, each with its own set of properties.Rotating About a Fixed Axis Example Object rotating on a string of changing length.
A small mass m attached to the end of a string revolves in a circle on a frictionless tabletop.
The other end of the string passes through a hole in the table. Initially, the mass revolves with a speed v 1 = m/s in a circle of radius R 1 = m. The. Jan 03, · Should Ground-Motion Records be Rotated to Fault-Normal/Parallel or Maximum Direction for Response History Analysis of Buildings?
By Juan C. Reyes and Erol Kalkan. Abstract. (torsionally flexible) layouts subjected to an ensemble of near-fault ground motions with and without apparent velocity pulses. Nov 01, · This paper describes the analysis and measurement of the dynamic motions of a large-scale rotating roll workpiece, which is used for a large-scale lathe, under the gravity condition.
A dynamic model which includes the gravity effect was first established. In order to investigate the behavior which comes from stiffness differences of the journal bearing at the headstock and the tailstock, a Cited by: 2.Dynamic Response of a Rotor-air Bearing System Due to Base Induced Periodic Motions.
pdf ) Yaying Niu, B.E., China Agricultural University Chair of Advisory Committee: Dr.
Luis San Andrés Oil-free microturbomachinery (MTM) are inevitably subjected to base or foundation excitations: multiple periodic load excitations from internal.Mar 31, · This download pdf equips the reader to understand every important aspect of the dynamics of rotating machines.
Will the vibration be large? What influences machine stability? How can the vibration be reduced? Which sorts of rotor vibration are the worst? The book develops this understanding initially using extremely simple models for each phenomenon, in which (at most) four equations capture the 5/5(1).rad rev rad r ebook rev 1 2 2 1 Note: ebook do not reset θto zero with each complete rotation of the reference line about the rotation axis.
2 turns θ=4π Translation: body’s movement described by x(t). Rotation: body’s movement given by θ(t) = angular position of the body’s reference line as function of .