Finite-time-domain synthesis of recursive linear time-variant causal digital filters by separable sequences

1993 ◽  
Vol 40 (11) ◽  
pp. 714-722
Author(s):  
Dongning Li
Keyword(s):  
Time Domain ◽  
Finite Time ◽  
Digital Filters ◽  
Linear Time

Concrete Modeling for Extreme Wave Slam Events

2017 ◽  
Author(s):  
Kasper Wåsjø ◽  
Terje P. Stavang ◽  
Tore H. Søreide
Keyword(s):  
Time Domain ◽  
Linear Time ◽  
Limit State ◽  
Material Model ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Capacity Control ◽  
Extreme Wave ◽  
Conventional Design ◽  
Non Linear

Experience from model tests has initiated a growing attention towards extreme wave slam as a critical load situation for offshore large volume structures. Most of the problem is related to the local slam pressure, which may go up to several MPa’s for 100-year and 10 000-year waves. The paper deals with modeling techniques for marine concrete structures under extreme slam loading from waves where dynamic effects together with material softening play a major role for the response. Different analysis approaches for ultimate limit state (ULS) and accidental limit state (ALS) controls are discussed in view of reliability philosophy as basis for conventional design approach. The present paper is devoted to the local impact scenario and the alternative approaches for response and capacity control involving non-linear time domain analyses. Conventional design schemes as based on linear elastic models for response calculation together with code specified capacity control often come out more conservative than non-linear approach. The paper demonstrates by case studies how softening of the structure in general reduces the response in terms of section forces. A key issue when going from conventional linear approaches into non-linear techniques is to still keep an acceptable reliability level on the capacity control. Load and material factors are normally based on structures with limited non-linearity where linear response modeling is representative. Implementing non-linear material model in time domain analysis has a major challenge in limiting the sensitivity in response and capacity calculation. The paper demonstrates the way material model of concrete affects the section forces to go into local capacity control, and concludes on needed sensitivity analyses. Practical approaches on the concrete slam problem together with resulting utilizations from the control are demonstrated. The full non-linear technique by response and capacity control in one analysis is also handled, using average material parameters and justifying safety factors for the effect of implementing characteristic lower strength of concrete in the capacity. The paper ends up in a recommendation on non-linear time domain analysis procedure for typically slam problems. A discussion is also given on applicable design codes with attention to non-linear analysis.

Time-domain noise analysis of linear time-Invariant and linear time-variant systems using MATLAB and HSPICE

2005 ◽  
Vol 52 (3) ◽  
pp. 805-812 ◽  
Author(s):  
S.C. Terry ◽  
B.J. Blalock ◽  
J.M. Rochelle ◽  
M.N. Ericson ◽  
S.D. Caylor
Keyword(s):  
Time Domain ◽  
Linear Time ◽  
Noise Analysis ◽  
Linear Time Invariant ◽  
Time Invariant

A Linear Time-Domain Two-Fluid Model Analysis of Dynamic Instability in Boiling Flow Systems

1986 ◽  
Vol 108 (1) ◽  
pp. 100-108 ◽  
Author(s):  
R. C. Dykhuizen ◽  
R. P. Roy ◽  
S. P. Kalra
Keyword(s):  
Time Domain ◽  
Dynamic Instability ◽  
Linear Time ◽  
Fluid Model ◽  
Density Wave ◽  
Model Description ◽  
Flow Systems ◽  
Boiling Flow ◽  
Two Fluid Model ◽  
Two Fluid

A linear analysis of dynamic instability in boiling flow systems has been carried out in the time domain. An unequal velocity, unequal temperature two-fluid model description of boiling flow is used. Instability threshold results of the density-wave oscillation type obtained have been compared with experimental data from Refrigerant-113 and water systems with satisfactory agreement.

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