Results 221 to 230 of about 31,897 (265)

Safety analysis of linear system with SOS for complex eigenvalues

2011 2nd International Conference on Instrumentation Control and Automation, 2011
In this paper we investigate safety verification of linear system. The structure of linear system will be exploited and converted to certain eigenstructure as an emptiness problem for a semi algebraic set. Sum of square (SOS) is emploited to check emptiness of of the set defines by polynomial inequalities which can be computed by semidifinite ...
Noorma Yulia Megawati, null Salmah, Indah Emilia Wijayanti, Endra Joelianto   +3 more
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Analysis of disc brake squeal using the complex eigenvalue method

Applied Acoustics, 2007
A new functionality of ABAQUS/Standard, which allows for a nonlinear analysis prior to a complex eigenvalue extraction in order to study the stability of brake systems, is used to analyse disc brake squeal. An attempt is made to investigate the effects of system parameters, such as the hydraulic pressure, the rotational velocity of the disc, the ...
Liu, P., Zheng, H., Cai, C., Wang, Y.Y., Lu, C., Ang, K.H., Liu, G.R.   +6 more
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Eigenvalue Based Stability Analysis for Asymmetric Complex Dynamical Networks

2009
The problem of stabilization in complex networks with asymmetric couplings forced by pinning control is studied. By using eigenvalue analysis, controllable regions for different types of coupling links are obtained. Some relevant factors on controllability such as pinning fraction and pinning strength are also investigated.
Zengqiang Chen, Linying Xiang, Zhongxin Liu, Zhuzhi Yuan, Kai Chang   +4 more
openaire   +1 more source

Complex Eigenvalue Analysis Applied to an Aircraft Brake Vibration Problem

Volume 3A: 15th Biennial Conference on Mechanical Vibration and Noise — Vibration of Nonlinear, Random, and Time-Varying Systems, 1995
Abstract A conventional finite element model of an aircraft wheel and brake is extended to include forces responsible for friction-induced noise. Responses of aircraft brake vibration modes change the normal force across the brake friction interfaces, and consequently the friction forces.
Denis J. Feld, Dana J. Fehr
openaire   +1 more source

Implications of complex eigenvalues in homogeneous flow: A three-dimensional kinematic analysis

Journal of Structural Geology, 2010
Abstract We present an investigation of the kinematic properties of 3D homogeneous flow defined by complex eigenvalues. We demonstrate, using simple algebraic analysis, that the clear threshold between pulsating and non-pulsating fields, fixed for Wn > 1 and valid for planar flow, is not easily defined in a 3D flow system.
IACOPINI D., CAROSI, Rodolfo, XYPOLIAS P.   +2 more
openaire   +4 more sources

A prediction methodology of disk brake squeal using complex eigenvalue analysis

International Journal of Vehicle Design, 2008
This paper presents a methodology for predicting disk brake squeal using the Finite Element (FE) method whereby a three-dimensional FE model of a real disk brake is validated at the component and assembly levels, and more importantly through contact analysis.
Abd Rahim AbuBakar, Huajiang Ouyang
openaire   +1 more source

Complex Eigenvalue Analysis and Brake Squeal: Traps, Shortcomings and their Removal

SAE International Journal of Passenger Cars - Mechanical Systems, 2012
<div class="section abstract"><div class="htmlview paragraph">Among many NVH problems brake squeal continues to be a difficult topic for design engineers and scientists. Both the experimental and the simulation approaches so far have failed to provide robust and reliable guidelines for the design of squeal free brakes.
Gottfried Spelsberg-Korspeter, Peter Hagedorn   +1 more
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Complexity analysis of eigenvalue based spectrum sensing techniques in cognitive radio networks

2012 18th Asia-Pacific Conference on Communications (APCC), 2012
Energy based spectrum sensing detectors is optimal in terms of computational complexity but they have certain limitations of their dependence upon noise. In contrast eigenvalue based algorithms do not depend upon noise uncertainty. Eigenvalue based algorithms are computationally complex as compared to energy detection method.
Ammar Ikram, Adnan Rashdi
openaire   +1 more source

Analysis of squeaking on ceramic hip endoprosthesis using the complex eigenvalue method

Wear, 2011
Abstract A finite element model of the ceramic hip endoprosthesis system is established with ABAQUS 6.7. The generation mechanism of squeaking is studied using the complex eigenvalue method which allows for a stability analysis of the system under friction coupling.
N. Fan, G.X. Chen, L.M. Qian
openaire   +1 more source

A Study on the Reduction of Disc Brake Squeal Using Complex Eigenvalue Analysis

SAE Technical Paper Series, 2001
<div class="htmlview paragraph">In this paper, we investigate a method to calculate the dynamic instability of a disc brake system and propose a criterion of design modification. To estimate dynamic instability, complex eigenvalue analysis is performed for a brake system and the contribution factor of each component to an unstable complex mode is
Choonki Park, Min Gyu Han, Sung Sun Cho, Hyoung Gil Choi, Ji Deok Jeong, Jang Moo Lee   +5 more
openaire   +1 more source