scholarly journals Simulation study on the detection of size, shape and position of three different scatterers using Non-standard time domain time inverse Maxwell’s algorithm

2010 ◽  
Vol 18 (5) ◽  
pp. 4148 ◽  
Author(s):  
Kisalaya Chakrabarti ◽  
James B. Cole
Keyword(s):  
Simulation Study ◽  
Time Domain ◽  
Standard Time

Modal participation in multiple input Ibrahim time domain identification

2017 ◽  
Vol 24 (1) ◽  
pp. 168-180 ◽  
Author(s):  
Rune Brincker ◽  
Peter Olsen ◽  
Sandro Amador ◽  
Martin Juul ◽  
Abdollah Malekjafarian ◽  
...  
Keyword(s):  
Simulation Study ◽  
Time Domain ◽  
Toeplitz Matrices ◽  
Full Rank ◽  
Impulse Response Functions ◽  
System Matrix ◽  
Estimation Errors ◽  
Domain Identification ◽  
Multiple Input ◽  
Identification Technique

The Ibrahim time domain (ITD) identification technique was one of the first techniques formulated for multiple output modal analysis based on impulse response functions or general free decays. However, the technique has not been used much in recent decades due to the fact that the technique was originally formulated for single input systems that suffer from well-known problems in case of closely spaced modes. In this paper, a known, but more modern formulation of the ITD technique is discussed. In this formulation the technique becomes multiple input by adding some Toeplitz matrices over a set of free decays. It is shown that a special participation matrix can be defined that cancels out whenever the system matrix is estimated. The participation matrix becomes rank deficient if a mode is missing in the responses, but if any mode is present in one of the considered free decays, the participation matrix has full rank. This secures that all modes will be contained in the estimated system matrix. Finally, it is discussed how correlation functions estimated from the operational responses of structures can be used as free decays for the multiple-input ITD formulation, and the estimation errors of the identification technique are investigated in a simulation study with closely spaced modes. The simulation study shows that the multiple-input formulation provides estimates with significantly smaller errors on both mode shape and natural frequency estimates.

Pressure Analysis of Hydraulic Pumping System of Concrete Pump

2011 ◽  
Vol 383-390 ◽  
pp. 7543-7549
Author(s):  
Weng Ning Qiu ◽  
Hong Yu Wei
Keyword(s):  
Simulation Study ◽  
Time Domain ◽  
Closed Loop ◽  
High Volume ◽  
Piston Pump ◽  
Hydraulic Shock ◽  
Pumping System ◽  
Set Up ◽  
Concrete Pump ◽  
Pressure Analysis

By means of power linkage chart method, the model of closed loop pumping system of concrete pump was set up and simulation was carried out in the Matlab. The results show that the hydraulic shock in the closed loop did not occur at the rapid commutation of piston pump and it actually happened when the concrete was pushed forward after compression. The main piston pump commutation is soft action and this shock can be eliminated effectively by means of “SN” control. Closed loop delivery system is used more widely in high volume concrete pumps and is featured by advantages like energy saving, smooth commutation and low hydraulic shock. In this paper, by means of power linkage chart method, the model of the system was set up and dynamics equations set of the system was obtained. A simulation model was set up by means of simulation toolkit in Matlab language – Simulink, in order to have simulation study of commutation shock of the pumping system and shock due to pushing load and obtain the transient performance of model in time domain.

Time-domain diffuse optics beyond pile-up limits: a simulation study based on relevant figures of merit

2021 ◽  
Author(s):  
Elisabetta Avanzi ◽  
Laura Di Sieno ◽  
Anurag Behera ◽  
Davide Contini ◽  
Alberto Dalla Mora
Keyword(s):  
Simulation Study ◽  
Time Domain ◽  
Diffuse Optics ◽  
Figures Of Merit ◽  
Pile Up
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