Modal analysis of a DAM–Foundation system based on an FE–BE method in the time domain

1994 ◽  
Vol 23 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Terumi Touhei ◽  
Tatsuo Ohmachi
Keyword(s):  
Modal Analysis ◽  
Time Domain ◽  
Dam Foundation ◽  
The Time Domain

scholarly journals Modal Analysis of a Circular Slot Monopole Antenna for UWB application

2019 ◽  
Vol 18 (3) ◽  
pp. 34-43
Author(s):  
Adamu Halilu Jabire ◽  
Anas Abdu ◽  
Salisu Sani ◽  
Sani Saminu ◽  
Aliu Uba Taura ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Time Domain ◽  
Monopole Antenna ◽  
Slot Antenna ◽  
Design Stage ◽  
Radiation Characteristics ◽  
Characteristic Mode ◽  
Physical Insight ◽  
The Time Domain ◽  
Antenna Model

 In this study, a wideband double slot antenna is introduced. The proposed monopole antenna is designed using the theory of characteristic mode for slot monopoles. A circular shape is used as the initial design stage, to enhance the bandwidth, two circular slots are employed. Four modes have been excited to gain a physical insight and to find out which mode is dominant. The design and analysis were completed utilizing both the time domain and multilayer solver in CST 2017, without considering the feeding port. An antenna model in UWB frequency is constructed. Experimented and simulated results shows that the proposed planar structure has a wide impedance width with good radiation characteristics.

Nonlinear Strain Estimation Based on Linear Parameters

2018 ◽  
Author(s):  
Bruna Nabuco ◽  
Tobias Friis ◽  
Marius Tarpø ◽  
Sandro Amador ◽  
Evangelos I. Katsanos ◽  
...  
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Time Domain ◽  
Structural Model ◽  
Element Model ◽  
Random Loading ◽  
Strain Estimation ◽  
The Time Domain

This paper aims to demonstrate how to estimate strains of fixed structures considering cases with nonlinearities based on parameters determined from one linear case. Both simulated and experimental data have been evaluated. A finite element model was used to obtain the simulated responses. Accelerations and strains were measured along the application of random loading to a fixed structural model for the experimental data. Operational Modal Analysis has been considered in the time domain in order to identify the modal properties. Nonlinearities are included as friction is imposed on the models.

Experimental Modal Analysis of Motorized Spindle Based on Stochastic Subspace Identification

2011 ◽  
Vol 103 ◽  
pp. 469-474
Author(s):  
Jie Meng ◽  
Xiao An Chen
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Time Domain ◽  
Experimental Modal Analysis ◽  
Modal Parameters ◽  
Vibration Velocity ◽  
Subspace Identification ◽  
Motorized Spindle ◽  
Stochastic Subspace Identification ◽  
The Time Domain

Experimental modal analysis is done to the grinding motorized spindle under 36000r/min. The corresponding theory and experimental plan are introduced. The time domain waveform is gained and the maximum vibration velocity is worked out. Stochastic Subspace Identification (SSI) is applied to study dynamic characteristics of motorized spindle which is running idle, then modal parameters are extracted. The correctness of the experimental method is validated, which has certain referential importance.

scholarly journals Modal Analysis in the Time Domain and Its Application.

1995 ◽  
Vol 61 (583) ◽  
pp. 907-914
Author(s):  
Koji Ando ◽  
Tadashi Annaka ◽  
Tetsushi Kurita
Keyword(s):  
Modal Analysis ◽  
Time Domain ◽  
The Time Domain
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