A self-oscillating gel system with complex dynamic behavior based on a time delay between the oscillations

Soft Matter ◽  
2021 ◽  
Author(s):  
Xiuchen Li ◽  
Jie Li ◽  
Zhaohui Zheng ◽  
Jinni Deng ◽  
Yi Pan ◽  
...  
Keyword(s):  
Time Delay ◽  
Dynamic Behavior ◽  
Experimental Studies ◽  
Complex Dynamic ◽  
Chemical Oscillation ◽  
Mechanical Oscillation ◽  
Behavior Based ◽  
Gel System

The time delay existing between the chemical oscillation and mechanical oscillation (C-M delay) in a self-oscillating gel (SOG) system is observable in previous experimental studies. However, how the C-M delay...

Experimental study of H∞ control for a flexible plate

2011 ◽  
Vol 18 (11) ◽  
pp. 1631-1649 ◽  
Author(s):  
Zhao Tong ◽  
Chen Long-Xiang ◽  
Cai Guo-Ping
Keyword(s):  
Time Delay ◽  
Integral Transformation ◽  
External Disturbance ◽  
Experimental Studies ◽  
State Equation ◽  
Small Time ◽  
Linear Matrix ◽  
Structural Parameter ◽  
Flexible Plate ◽  
Standard State

This paper presents theoretical and experimental studies of H∞ control for a flexible plate. Firstly, the dynamic equation of the plate with time delay is established with consideration of external disturbance. Then the standard state equation without explicit time delay is deduced by using a particular integral transformation to the time-delay equation. Finally, a H∞ time-delay controller is designed based on the standard state equation using the method of linear matrix inequality. In the controller designed, it contains not only the current step of state feedback but also the linear combination of some former steps of control. In the experiment, piezoelectric patches are used as actuators and sensors. The experiment system is structured based on the DSP TMS320F2812. Single time delay and double time delay are both considered in the experiment. The robustness of H∞ controller against the structural parameter of the plate and time delay is experimentally investigated. Simulation and experimental results indicate that the control system may suffer from instability if time delay is not treated in control design. The time-delay controller presented in this paper can effectively deal with time delay in the system, and is available for small-time delay and large-time delay as well. Furthermore, this delay controller is robust to the variance of structural parameter of the plate and time delay.

NMR Studies of Ru3(CO)10(PMe2Ph)2and Ru3(CO)10(PPh3)2and Their H2Addition Products:  Detection of New Isomers with Complex Dynamic Behavior

2001 ◽  
Vol 123 (40) ◽  
pp. 9760-9768 ◽  
Author(s):  
Damir Blazina ◽  
Simon B. Duckett ◽  
Paul J. Dyson ◽  
Brian F. G. Johnson ◽  
Joost A. B. Lohman ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Complex Dynamic ◽  
Nmr Studies

Dynamic behavior of impurities and native components in model LSM microelectrodes on YSZ

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87679-87693 ◽  
Author(s):  
Kion Norrman ◽  
Karin Vels Hansen ◽  
Torben Jacobsen
Keyword(s):  
Energy Conversion ◽  
Dynamic Behavior ◽  
Elevated Temperatures ◽  
Complex Dynamic ◽  
Conversion Materials

Energy conversion materials exhibit complex dynamic behavior when subjected to elevated temperatures and polarization.

Evaluation of Dynamic Behavior of Pile Foundations for Interim Storage Facilities Through Geotechnical Centrifuge Tests

2002 ◽  
Author(s):  
Shizuo Tsurumaki ◽  
Hiroyuki Watanabe ◽  
Akira Tateishi ◽  
Kenichi Horikoshi ◽  
Shunichi Suzuki
Keyword(s):  
Dynamic Behavior ◽  
Experimental Studies ◽  
Centrifuge Modeling ◽  
Pile Foundations ◽  
Soil Conditions ◽  
Confining Stress ◽  
Geotechnical Centrifuge ◽  
Centrifuge Tests ◽  
Interim Storage ◽  
Storage Facilities

In Japan, there is a possibility that interim storage facilities for recycled nuclear fuel resources may be constructed on quaternary layers, rather than on hard rock. In such a case, the storage facilities need to be supported by pile foundations or spread foundations to meet the required safety level. The authors have conducted a series of experimental studies on the dynamic behavior of storage facilities supported by pile foundations. A centrifuge modeling technique was used to satisfy the required similitude between the reduced size model and the prototype. The centrifuge allows a high confining stress level equivalent to prototype deep soils to be generated (which is considered necessary for examining complex pile-soil interactions) as the soil strength and the deformation are highly dependent on the confining stress. The soil conditions were set at as experimental variables, and the results are compared. Since 2000, the Nuclear Power Engineering Corporation (NUPEC) has been conducting these research tests under the auspices on the Ministry of Economy, Trade and Industry of Japan.

Improved Simulation of Heel Contact During Normal Walking

2011 ◽  
Author(s):  
Arash Mahboobin ◽  
Rakié Cham ◽  
Stephen J. Piazza
Keyword(s):  
Computational Modeling ◽  
Dynamic Systems ◽  
Experimental Studies ◽  
Forward Dynamics ◽  
Research Needs ◽  
Normal Walking ◽  
Complex Dynamic ◽  
Complex Dynamic Systems ◽  
Heel Contact ◽  
Dynamics Simulations

Causes of slips and falls involve the interaction of complex environmental and human factors [1]. While experimental studies have been useful to identify biomechanical variables that may impact slipping severity, it is unclear how these factors interact. Relying on experiments alone to acquire this knowledge and establishing cause-effect relationships in complex dynamic systems is difficult. Computational modeling and forward dynamics simulations of walking and slipping are needed to meet these research needs.

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