Identification of Blockage in a Pipe Using Modal Analysis

Modal Characteristics ◽

Acoustic Modes ◽

Simulation Results ◽

The use of acoustic finite element modal analysis for simulating and identifying blockage in a pipe network is presented in this paper. The analysis commences with a straight fluid-filled pipe without any flaw. The natural frequencies of the acoustic modes of the fluid in the pipe are computed. Blockages of different magnitudes are introduced at different locations along the length of the pipe. The corresponding natural frequencies of the acoustic modes of the fluid in the pipe are again computed by finite element technique. From these results, the modal characteristics of partially blocked pipes are established and compared with simulation results of defect-free fluid-filled pipes in order to ascertain the defect location and sizes.

The finite element technique for predicting the natural frequencies, mode shapes and damping values of filamentary composite plates

Applied Mathematics and Mechanics ◽

10.1007/bf01897064 ◽

1986 ◽

Vol 7 (2) ◽

pp. 197-213 ◽

Cited By ~ 3

Author(s):

Lin Dun-xiang ◽

Ni Rong-gen ◽

R. D. Adams

Keyword(s):

Finite Element ◽

Natural Frequencies ◽

Composite Plates ◽

Mode Shapes ◽

Third Paper: Dynamic Analysis of an Automobile Chassis Frame

Proceedings of the Institution of Mechanical Engineers ◽

10.1243/pime_proc_1970_185_078_02 ◽

1970 ◽

Vol 185 (1) ◽

pp. 683-690 ◽

Cited By ~ 1

Author(s):

R. Ali ◽

J. L. Hedges ◽

B. Mills

Keyword(s):

Finite Element ◽

Dynamic Analysis ◽

Natural Frequencies ◽

Experimental Results ◽

Mode Shapes ◽

Inertia Matrix ◽

The finite element technique has been used for the prediction of natural frequencies and mode shapes of a chassis structure. The program developed in Paper 1 was extended by adding an inertia matrix. The effects of shear and tapered beams were also considered and predictions of frequencies and mode shapes are compared with experimental results.

Deflection and Vibration Analysis of a Flexible Fan Blade

Journal of Mechanical Engineering Science ◽

10.1243/jmes_jour_1973_015_071_02 ◽

1973 ◽

Vol 15 (6) ◽

pp. 387-391 ◽

Cited By ~ 2

Author(s):

M. A. Dokainish ◽

D. M. Gossain

Keyword(s):

Finite Element ◽

Vibration Analysis ◽

Natural Frequencies ◽

Cooling System ◽

Mode Shapes ◽

Fan Blade ◽

Finite-element technique used to obtain deflected configuration, and natural frequencies and mode shapes of flex-fan blades, used in automobile cooling system, as function of speed of fan.

Modal Analysis of 160KVA Dry-Type Transformer Based on ANSYS

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.229-231.919 ◽

2012 ◽

Vol 229-231 ◽

pp. 919-922

Author(s):

Bao Dong Bai ◽

Guo Hui Yang ◽

Bing Yin Qu ◽

Jian Zhang

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Modal Analysis ◽

Noise Level ◽

Natural Frequencies ◽

Analysis Software ◽

Element Analysis ◽

The Core ◽

The Finite Element Analysis ◽

Simulation Results

In this paper, the modal analysis was carried out on the core and cavity of a 160KVA dry-type transformer based on the finite element analysis software of ANSYS. And the simulation results of the natural frequencies and modal shapes were obtained, which provided a theoretical guidance to the design of the transformer structure, and were meaningful to reduce the vibration and noise level of the transformer.

Modal Analysis of Compressor Impeller with Crack and Blade Fracture

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.1018 ◽

2013 ◽

Vol 712-715 ◽

pp. 1018-1021

Author(s):

Mei Jiao Li ◽

Hua Qing Wang ◽

Wei Min Wang

Keyword(s):

Finite Element ◽

Fault Diagnosis ◽

Modal Analysis ◽

Centrifugal Compressor ◽

Natural Frequencies ◽

Element Model ◽

Three Dimension ◽

Compressor Impeller ◽

Diagnosis Method ◽

Simulation Results

The research of impeller dynamic characteristics by modal analysis technology is a kind of practical and effective fault diagnosis method, which has the vital significance to realize the security of machinery. Crack and blade fracture often occur in centrifugal compressor impeller. In order to study the impeller dynamic characteristic with crack and the blade fracture, a three-dimension finite element model (FEM) was built using ANSYS program, and an experimental modal analysis was also carried out. The compared results show that the preceding four orders natural frequencies and vibration models are basically consistent, and those also verified the reliability of the simulation results. In addition, two kinds of failure mode were also simulated, such as crack and blade fracture. It concluded that all orders natural frequencies decrease clearly, compared with the normal impeller. How the severity of crack and blade fracture affects the natural frequency was also discussed.

Paper 6: On Predicting Crankshaft Stiffnesses and Frequencies

Proceedings of the Institution of Mechanical Engineers Conference Proceedings ◽

10.1243/pime_conf_1967_182_359_02 ◽

1967 ◽

Vol 182 (12) ◽

pp. 52-57

Author(s):

I. J. Bickley ◽

H. McCallion

Keyword(s):

Finite Element ◽

Empirical Data ◽

Natural Frequencies ◽

Bending Stiffness ◽

Mode Shapes ◽

Design Stage ◽

Realistic Approach ◽

Currently design stage calculations of crankshaft stiffnesses involve the extensive use of empirical data. Also, in the calculation of loads on main bearings it is customary to assume the load on any throw to be equally distributed between adjacent main bearings. Before a more realistic approach to the design of crankshafts and main bearings may be made it is necessary to develop and prove a method of analysis. In this paper the finite-element technique is used for predicting the static and vibrational behaviour of crankshafts. The calculated values of axial, torsional, and bending stiffness of a crankshaft, together with its natural frequencies and mode shapes, are compared with experimentally determined values.