Targeted modal response control of structures using inerter-based systems based on master oscillator principle

2021 ◽  
pp. 106636
Author(s):  
Ruifu Zhang ◽  
Luqi Zhang ◽  
Chao Pan ◽  
Dario De Domenico ◽  
Qingjun Chen
Keyword(s):  
Master Oscillator ◽  
Response Control ◽  
Modal Response

Optimum sensitivity-based statistical parameters estimation from modal response

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 1166-1174
Author(s):  
Y. Araki ◽  
K. D. Hjelmstad
Keyword(s):  
Parameters Estimation ◽  
Statistical Parameters ◽  
Modal Response

Systematization of Shock Response Control Based on Momentum Exchange and Energy Exchange and Its Application to Lunar/Planetary Spacecraft

Impact ◽  
2019 ◽  
Vol 2019 (10) ◽  
pp. 73-75
Author(s):  
Susumu Hara
Keyword(s):  
Energy Exchange ◽  
Control Mechanism ◽  
Cost Effective ◽  
Aerospace Engineering ◽  
Single Test ◽  
Momentum Exchange ◽  
Mars Rover ◽  
Response Control ◽  
Shock Control ◽  
Shock Response

Professor Susumu Hara is based at the Department of Aerospace Engineering, Nagoya University in Japan explains that when the Mars rover Opportunity was set to land on that planet in the first weeks of 2004, onlookers held their breath as it dropped from orbit and hurtled toward the red surface. 'Any failure in the calculations or landing systems would mean a harder than expected impact,' he highlights. 'The impacts sustained by a rover such as Opportunity can derail a mission before it even starts, damaging cargo or vital systems required to complete the mission.' Impacts occur during landing but also as the craft enters the atmosphere, when it makes sudden moves, while it is on surface or when debris strikes it. 'Therefore, a system and materials to protect a craft are vital,' outlines Hara. 'Surprisingly, the solutions to this problem are not sophisticated. In fact, most craft still employ devices resembling automobile bumpers, which absorb the energy from an impact by crumpling under the force of said impact.' Unfortunately, these cannot be reused, even during testing phases a new prototype is required after every single test run. Recent missions also employed techniques like airbags or sky cranes. While successful they too have drawbacks. 'Airbags create huge rebounds which can jostle the craft and the contents inside while sky cranes are extremely costly to develop,' Hara says. For this reason, he is dedicated to designing a new highly reliable and cost-effective shock control mechanism.

Dynamics Response Control of a Mindlin-Type Beam

2017 ◽  
Vol 17 (03) ◽  
pp. 1750039 ◽  
Author(s):  
Kenan Yildirim ◽  
Seda G. Korpeoglu ◽  
Ismail Kucuk
Keyword(s):  
Optimal Control ◽  
Partial Differential Equations ◽  
Maximum Principle ◽  
Control Problem ◽  
Control Function ◽  
Initial Boundary ◽  
Response Control ◽  
Adjoint Variables ◽  
Dynamics Response ◽  
Optimal Control Function

Optimal boundary control for damping the vibrations in a Mindlin-type beam is considered. Wellposedness and controllability of the system are investigated. A maximum principle is introduced and optimal control function is obtained by means of maximum principle. Also, by using maximum principle, control problem is reduced to solving a system of partial differential equations including state, adjoint variables, which are subject to initial, boundary and terminal conditions. The solution of the system is obtained by using MATLAB. Numerical results are presented in table and graphical forms.

300-mW diffraction-limited beam from flat-phase-front antiguided master oscillator power amplifier

1994 ◽  
Author(s):  
Charles Zmudzinski ◽  
Chan A. Tu ◽  
Dan Botez ◽  
Luke J. Mawst ◽  
Rashit F. Nabiev ◽  
...  
Keyword(s):  
Power Amplifier ◽  
Master Oscillator ◽  
Master Oscillator Power Amplifier ◽  
Phase Front

Seismic response control of asymmetric buildings using tuned mass dampers

2019 ◽  
Vol 28 (18) ◽  
Author(s):  
Ahmad Edris Taha ◽  
Said Elias ◽  
Vasant Matsagar ◽  
Arvind Kumar Jain
Keyword(s):  
Seismic Response ◽  
Tuned Mass Dampers ◽  
Response Control ◽  
Seismic Response Control ◽  
Asymmetric Buildings

scholarly journals An Underdetermined Blind Source Separation Method with Application to Modal Identification

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Gang Yu
Keyword(s):  
Blind Source Separation ◽  
Source Separation ◽  
Modal Identification ◽  
Modal Parameters ◽  
Underdetermined Blind Source Separation ◽  
Structural Dynamic ◽  
Time Frequency ◽  
Modal Response ◽  
Experimental Validations ◽  
Straight Lines

In structural dynamic analysis, the blind source separation (BSS) technique has been accepted as one of the most effective ways for modal identification, in which how to extract the modal parameters using very limited sensors is a highly challenging task in this field. In this paper, we first review the drawbacks of the conventional BSS methods and then propose a novel underdetermined BSS method for addressing the modal identification with limited sensors. The proposed method is established on the clustering features of time-frequency (TF) transform of modal response signals. This study finds that the TF energy belonging to different monotone modals can cluster into distinct straight lines. Meanwhile, we provide the detailed theorem to explain the clustering features. Moreover, the TF coefficients of each modal are employed to reconstruct all monotone signals, which can benefit to individually identify the modal parameters. In experimental validations, two experimental validations demonstrate the effectiveness of the proposed method.

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