Frequency-Domain Response Prediction of a Launch Vehicle Coupled with New Payloads

2021 ◽  
pp. 1-6
Author(s):  
Siyang Piao ◽  
Yahui Zhang
Keyword(s):  
Frequency Domain ◽  
Response Prediction ◽  
Launch Vehicle ◽  
Frequency Domain Response

scholarly journals Time and Frequency Domain Response of HTS Resonators for Use as NMR Transmit Coils

2019 ◽  
Vol 29 (5) ◽  
pp. 1-5
Author(s):  
Ghoncheh Amouzandeh ◽  
Vijaykumar Ramaswamy ◽  
Nicolas Freytag ◽  
Arthur S. Edison ◽  
Lawrence A Hornak ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Frequency Domain Response

scholarly journals The influence of level ice on the frequency domain response of floaters

2017 ◽  
Vol 143 ◽  
pp. 112-125 ◽  
Author(s):  
Chris Keijdener ◽  
João Manuel de Oliveira Barbosa ◽  
Andrei V. Metrikine
Keyword(s):  
Frequency Domain ◽  
Level Ice ◽  
Frequency Domain Response

Finite-Element Modeling and Frequency-Domain Analysis of Liquid-Propulsion Launch Vehicle

AIAA Journal ◽  
2015 ◽  
Vol 53 (11) ◽  
pp. 3297-3304 ◽  
Author(s):  
Yu Hao ◽  
Guo-an Tang ◽  
Deyuan Xu ◽  
Qiongliang Yang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Frequency Domain ◽  
Domain Analysis ◽  
Launch Vehicle ◽  
Frequency Domain Analysis ◽  
Element Modeling

scholarly journals Multipoint Vibration Response Prediction under Uncorrelated Multiple Sources Load Based on Elastic-Net Regularization in Frequency Domain

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
ZhenKai Cui ◽  
Cheng Wang ◽  
Jianwei Chen ◽  
Ting He
Keyword(s):  
Linear Regression ◽  
Frequency Domain ◽  
Response Prediction ◽  
Acoustic Vibration ◽  
Vibration Response ◽  
Elastic Net ◽  
Multiple Sources ◽  
Regression Methods ◽  
Elastic Net Regularization ◽  
Working Situation

In order to solve the problems of large number of conditions at inherent frequencies and low prediction accuracy when using multiple multivariate linear regression methods for vibration response prediction alone, an elastic-net regularization method is proposed. Firstly, a multi-input and multioutput linear regression model of the multipoint frequency domain vibration response is trained using historical data at each frequency point. Secondly, the trained model under each frequency point is improved by the elastic regularization. Finally, the model is used in a working situation. The predicted vibration response on the experimental dataset of cylindrical shell acoustic vibration showed that the improvement of the multivariate regression vibration response prediction model by elastic regularization can better improve the accuracy and reduce the large number of conditions at some frequencies.

Research on identification of irrational fractional-order systems in frequency domain based on optimization algorithm

2019 ◽  
Vol 41 (15) ◽  
pp. 4351-4357
Author(s):  
Chen Lanfeng ◽  
Xue Dingyu
Keyword(s):  
Frequency Domain ◽  
Fractional Order ◽  
Optimization Algorithm ◽  
Controller Design ◽  
Order System ◽  
Model Parameters ◽  
Fractional Order Systems ◽  
Convolution Integral ◽  
Fractional Order Calculus ◽  
Frequency Domain Response

Fractional-order calculus can obtain better results than the integer-order in control theory, so it has become a research hotspot in recent years. However, the structure of the irrational fractional-order system is complex, so its theoretical analysis and controller design are more difficult. In this paper, a method based on convolution integral is proposed to obtain the frequency domain response of the irrational model. Combined with the optimization algorithm, the model parameters are identified. Moreover, the rationalization of the irrational model is realized, which facilitates the analysis and application design of this kind models. Finally, two examples are given to illustrate the effectiveness and feasibility of the method by identifying parameters and rationalization.

scholarly journals Frequency domain boundary value problem analyses of acoustic metamaterials described by an emergent generalized continuum

2019 ◽  
Vol 65 (3) ◽  
pp. 789-805 ◽  
Author(s):  
A. Sridhar ◽  
V. G. Kouznetsova ◽  
M. G. D. Geers
Keyword(s):  
Boundary Value Problem ◽  
Boundary Conditions ◽  
Frequency Domain ◽  
Domain Boundary ◽  
Boundary Value ◽  
Short Wave ◽  
Acoustic Metamaterials ◽  
Value Analysis ◽  
Macro Scale ◽  
Frequency Domain Response

AbstractThis paper presents a computational frequency-domain boundary value analysis of acoustic metamaterials and phononic crystals based on a general homogenization framework, which features a novel definition of the macro-scale fields based on the Floquet-Bloch average in combination with a family of characteristic projection functions leading to a generalized macro-scale continuum. Restricting to 1D elastodynamics and the frequency-domain response for the sake of compactness, the boundary value problem on the generalized macro-scale continuum is elaborated. Several challenges are identified, in particular the non-uniqueness in selection of the boundary conditions for the homogenized continuum and the presence of spurious short wave solutions. To this end, procedures for the determination of the homogenized boundary conditions and mitigation of the spurious solutions are proposed. The methodology is validated against the direct numerical simulation on an example periodic 2-phase composite structure.

Time and Frequency Domain Response of Grape Berries to Nondestructive Impact during the Harvesting Period

2015 ◽  
Vol 47 (1) ◽  
pp. 24-33 ◽  
Author(s):  
J. Trnka ◽  
P. Pavloušek ◽  
Š. Nedomova ◽  
J. Buchar
Keyword(s):  
Frequency Domain ◽  
Grape Berries ◽  
Frequency Domain Response
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