Dissipated Energy as the Evaluation Index for the Double Reduction Method

2021 ◽  
Vol 21 (6) ◽  
pp. 06021012
Author(s):  
Quan Chen ◽  
Bing Bai ◽  
Haibin Wang ◽  
Xiaochun Li
Keyword(s):  
Reduction Method ◽  
Evaluation Index ◽  
Dissipated Energy ◽  
Double Reduction

Modified Double-Reduction Method considering Strain Softening and Equivalent Influence Angle

2020 ◽  
Vol 24 (11) ◽  
pp. 3257-3266 ◽  
Author(s):  
Yifan Chen ◽  
Hang Lin ◽  
Yixian Wang ◽  
Rihong Cao ◽  
Chunyang Zhang ◽  
...  
Keyword(s):  
Strain Softening ◽  
Reduction Method ◽  
Double Reduction

Construction Method of Fuzzy Attribute Information System Based on DEA and Attribute Reduction

2011 ◽  
Vol 50-51 ◽  
pp. 130-134
Author(s):  
Yan Kun Li
Keyword(s):  
Information System ◽  
Data Envelopment Analysis ◽  
Index System ◽  
Reduction Method ◽  
Attribute Reduction ◽  
Construction Method ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Data Envelopment ◽  
Attribute Information

For the subjectivity of attribute value in the fuzzy attribute information system, this paper proposes a construction method of fuzzy attribute information system based on DEA (Data Envelopment Analysis). Then an attribute reduction method based on the dependability degree of attribute is given. At last, the proposed method is implemented successfully in the optimization of evaluation index system.

A strength reduction method based on double reduction parameters and its application

2013 ◽  
Vol 20 (9) ◽  
pp. 2555-2562 ◽  
Author(s):  
Wei Yuan ◽  
Bing Bai ◽  
Xiao-chun Li ◽  
Hai-bin Wang
Keyword(s):  
Reduction Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Double Reduction

scholarly journals Analysis of Nonlinear Modal Damping Due to Friction at Blade Roots in Mistuned Bladed Disks

2021 ◽  
Vol 143 (3) ◽  
Author(s):  
Junjie Chen ◽  
Chaoping Zang ◽  
Biao Zhou ◽  
E. P. Petrov
Keyword(s):  
Reduction Method ◽  
Mode Shapes ◽  
Dissipated Energy ◽  
Damping Factor ◽  
Disk Model ◽  
Bladed Disk ◽  
Modal Damping ◽  
Engine Order ◽  
The Time Domain ◽  
Energy Dissipated

Abstract A method is proposed to analyze the modal damping in mistuned bladed-disk with root joints using large finite element models and the detailed description of frictional interactions at contact interfaces. The influence of mistuning on the dissipated energy for different blades on a bladed-disk and the modal damping factors for different vibration levels for any family of modes can be investigated. The dissipated energy and damping factors due to microslip are simulated by multitude of surface-to-surface elements modeling the friction contact interactions at root joints. The analysis is performed in the time domain, and an original reduction method is developed to obtain the results with acceptable computational times. The model reduction method allows the calculation of the modal damping of the mistuned assembly by evaluation of the energy dissipated at root joint of each individual blade using small parts of bladed disk sectors. The dependency of modal damping factor on blade mode shapes, engine-order excitation numbers, nodal diameter numbers, and vibration amplitudes is studied and the distributions of amplitude and dissipated energy on the mistuned bladed-disk are investigated using a realistic blade disk model.

Analysis of Nonlinear Modal Damping due to Friction at Blade Roots in Mistuned Bladed Discs

2020 ◽  
Author(s):  
Junjie Chen ◽  
Chaoping Zang ◽  
Biao Zhou ◽  
E. P. Petrov
Keyword(s):  
Reduction Method ◽  
Mode Shapes ◽  
Dissipated Energy ◽  
Damping Factor ◽  
Nodal Diameter ◽  
Modal Damping ◽  
Engine Order ◽  
The Time Domain ◽  
Energy Dissipated ◽  
Small Parts

Abstract A method is proposed to analyse the modal damping in mistuned bladed-disc with root joints using large finite element models and the detailed description of frictional interactions at contact interfaces. The influence of mistuning on the dissipated energy for different blades on a bladed-disc and the modal damping factors for different vibration levels for any family of modes can be investigated. The dissipated energy and damping factors due to micro-slip are simulated by multitude of surface-to-surface elements modelling the friction contact interactions at root joints. The analysis is performed in the time domain and an original reduction method is developed to obtain the results with acceptable computational times. The model reduction method allows the calculation of the modal damping of the mistuned assembly by evaluation of the energy dissipated at root joint of each individual blade using small parts of bladed disc sectors. The dependency of modal damping factor on blade mode shapes, engine-order excitation numbers, nodal diameter numbers and vibration amplitudes are studied and the distributions of amplitude and dissipated energy on the mistuned bladed-disc are investigated using a realistic blade disc model.

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