Application of the probabilistic approximate analysis method to a turbopump blade analysis

1990 ◽  
Author(s):  
B. THACKER ◽  
R. MCCLUNG ◽  
H. MILLWATER
Keyword(s):  
Approximate Analysis ◽  
Analysis Method

Brake Squeal Analysis by Finite Elements and Comparisons to Dyno Results

1999 ◽  
Author(s):  
W. V. Nack
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stiffness Matrix ◽  
Approximate Analysis ◽  
Stability Evaluation ◽  
Analysis Method ◽  
Brake Squeal ◽  
Complex Modes ◽  
Baseline Solution ◽  
Test Schedule

Abstract An approximate analysis method for brake squeal is presented. Using MSC/NASTRAN a geometric nonlinear solution is run using a friction stiffness matrix to model the contact between the pad and rotor. The friction coefficient can be pressure dependent. Next, linearized complex modes are found where the interface is set in a slip condition. Since the entire interface is set sliding, it produces the maximum friction work possible during the vibration. It is a conservative measure for stability evaluation. An averaged friction coefficient is measured and used during squeal. Dynamically unstable modes are found during squeal. They are due to friction coupling of neighboring modes. When these modes are decoupled, they are stabilized and squeal is eliminated. Good correlation with experimental results is shown. It will be shown that the complex modes baseline solution is insensitive to the type of variations in pressure and velocity that occur in a test schedule. This is due to the conservative nature of the approximation. Convective mass effects have not been included.

scholarly journals AN APPROXIMATE ANALYSIS METHOD OF BUILDINGS FOR THREE-DIMENSIONAL VIBRATIONS

2000 ◽  
Vol 65 (530) ◽  
pp. 63-69 ◽  
Author(s):  
Masahiro CHIBA ◽  
Mitsuharu KURATA ◽  
Kouji KURODA ◽  
Kazushige ASARI
Keyword(s):  
Three Dimensional ◽  
Approximate Analysis ◽  
Analysis Method

Approximate Analysis Method for Frequency-Selective Surface Based on Kirchhoff-Type Circuit

2018 ◽  
Vol 66 (11) ◽  
pp. 6076-6085 ◽  
Author(s):  
Kang Luo ◽  
Yun Yi ◽  
Zhi-Yuan Zong ◽  
Bin Chen ◽  
Xiaoli Zhou ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Approximate Analysis ◽  
Analysis Method ◽  
Kirchhoff Type ◽  
Frequency Selective

An Approximate Analysis Method for Multiphase Flow Data

1991 ◽  
Vol 6 (01) ◽  
pp. 121-128 ◽  
Author(s):  
Dyung T. Vo ◽  
Rajagopal Raghavan
Keyword(s):  
Multiphase Flow ◽  
Approximate Analysis ◽  
Flow Data ◽  
Analysis Method

Approximate analysis method for composite beams with partial interaction using Fourier series

2013 ◽  
Vol 13 (2) ◽  
pp. 219-227 ◽  
Author(s):  
Young-Hoon Park ◽  
Sung-Hoon Kim ◽  
Seung-Yong Lee ◽  
Jun-Hyeok Choi
Keyword(s):  
Fourier Series ◽  
Composite Beams ◽  
Approximate Analysis ◽  
Analysis Method ◽  
Partial Interaction
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