Fluid-Dynamical Behavior in Supersonic Closed-Loop Experimental Facility for Continuous MHD Power Generation

2006 ◽  
Author(s):  
Ryokichi Hombo ◽  
Kosuke Aizawa ◽  
Tomoyuki Murakami ◽  
Yoshihiro Okuno ◽  
Y Yamasaki
Keyword(s):  
Power Generation ◽  
Closed Loop ◽  
Dynamical Behavior ◽  
Experimental Facility

Results of the First Power Generation Test in Closed Loop Experimental Facility

2008 ◽  
Author(s):  
Masayuki Hosaka ◽  
Takafumi Ota ◽  
Tsukuru Nakahora ◽  
Tomoyuki Murakami ◽  
Yoshihiro Okuno ◽  
...  
Keyword(s):  
Power Generation ◽  
Closed Loop ◽  
Experimental Facility ◽  
Generation Test

scholarly journals Automatic locking of a parametrically resonating, base-excited, nonlinear beam

2021 ◽  
Author(s):  
Nir Ben Shaya ◽  
Izhak Bucher ◽  
Amit Dolev
Keyword(s):  
Relative Phase ◽  
Closed Loop ◽  
Dynamical Behavior ◽  
Open Loop ◽  
Vibration Modes ◽  
Nonlinear Structure ◽  
Nonlinear Beam ◽  
Loop Control ◽  
Control Scheme ◽  
Slender Beams

AbstractDescribed is a closed-loop control scheme capable of stabilizing a parametrically excited nonlinear structure in several vibration modes. By setting the relative phase between the spatially filtered response and the excitation, the open-loop unstable solution branches are stabilized under a 2:1 parametric excitation of a chosen mode of vibration. For a given phase, the closed-loop automatically locks on a limit cycle, through an Autoresonance scheme, at any desired point on the solution branches. Axially driven slender beams and nanowires develop large transverse vibration under suitable amplitudes and frequency base-excitation that are sensitive to small potential coupled field. To utilize such a structure as a sensor, stable and robust operation are made possible by the control scheme. In addition, an optimal operating point with large sensitivity to the sensed potential field can be set using phase as a tunable parameter. Detailed analysis of the dynamical behavior, experimental verifications, and demonstrations sheds light on some features of the system dynamics.

Modeling of a Hydraulic Elevator Driven by an Open-Loop Control

2009 ◽  
Author(s):  
Roberto Strada ◽  
Alberto Oldani
Keyword(s):  
Power Generation ◽  
Closed Loop ◽  
Open Loop ◽  
The Other ◽  
Open Loop Control ◽  
Proportional Valve ◽  
Loop Control ◽  
Complete Knowledge ◽  
Motion Time ◽  
Loop Control System

Electro-hydraulic elevators are widely used systems, especially in low level buildings, due to their very good ratio between power generation and dynamic response. Generally, the goal of an elevator system is just to reach the floor with a precision enough to be comfortable for the passengers, without the need to follow a specific law of motion; hence an open-loop control system could be enough. Otherwise such a kind of solution reduces the number of components, bringing down the costs of production. On the other hand a complete knowledge of the mechanical system’s behaviour is required. In this work we deal with the analysis of the behaviour of a commercial hydraulic elevator driven by an open loop control that monitors the downstream pressure of the proportional valve supplying the cylinder. At the end of the paper, a closed loop solution based on the pressure measurement and on the motion time is proposed.

scholarly journals Numerical Simulation of MHD Flow Behavior and Performance in the Disk MHD Generator of Closed Loop Experimental Facility

2006 ◽  
Vol 126 (9) ◽  
pp. 933-939 ◽  
Author(s):  
Alessandro Liberati ◽  
Tomoyuki Murakami ◽  
Yoshihiro Okuno ◽  
Hiroyuki Yamasaki
Keyword(s):  
Numerical Simulation ◽  
Closed Loop ◽  
Flow Behavior ◽  
Mhd Flow ◽  
Experimental Facility ◽  
Mhd Generator ◽  
And Performance
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