scholarly journals An Error Analysis Method SPP-BEAM and a Construction Guideline of Nonconforming Finite Elements for Fourth Order Elliptic Problems

2020 ◽  
Vol 38 (1) ◽  
pp. 195-222
Author(s):  
Jun Hu and Shangyou Zhang
Keyword(s):  
Finite Elements ◽  
Error Analysis ◽  
Fourth Order ◽  
Elliptic Problems ◽  
Analysis Method ◽  
Nonconforming Finite Elements

Evaluation of WISC Similarities Responses According to Cognitive Style and Error Analysis: A Comparative Study

1970 ◽  
Vol 26 (1) ◽  
pp. 175-180 ◽  
Author(s):  
Leon P. Hall ◽  
M. La Verne La Driere
Keyword(s):  
Error Analysis ◽  
Cognitive Style ◽  
Emotionally Disturbed ◽  
School Setting ◽  
Chronological Age ◽  
Matched Pairs ◽  
Analysis Method ◽  
Neurologically Impaired ◽  
Diagnostic Power ◽  
Definition Of

80 emotionally disturbed and 80 neurologically impaired boys in a public school setting were matched for WISC Full Scale IQ and chronological age. An analysis was made of the Similarities subtest responses utilizing both the error-analysis method of Spence and the cognitive style procedure of Sigel for purposes of comparison. The Wilcoxon matched-pairs signed-ranks technique was used in analyzing the data. The results were as follows: (1) the error analysis approach provided the greater potential for differential diagnosis between the two groups under consideration; (2) use of the cognitive style scores permitted improved definition of the dynamic implications of the error-analysis categories, inadequate abstracting and narrative-descriptive responses; (3) diagnostic power was not increased when all responses as opposed to errors alone were considered.

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.

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