Control Systems for Ultra-High Rise Elevators1

1998 ◽  
Vol 123 (4) ◽  
pp. 687-690
Author(s):  
S. R. Venkatesh ◽  
Y. M. Cho
Keyword(s):  
Exponential Stability ◽  
Control Systems ◽  
Global Exponential Stability ◽  
Control Design ◽  
Vertical Motion ◽  
Lumped Parameter Model ◽  
Performance Tests ◽  
High Rise ◽  
Lumped Parameter ◽  
Wear And Tear

We present a scalable and tunable control design for controlling elevator vertical motion for ultra high-rise buildings. Scalability is desirable to enable customization to any hoistway while tunability enables periodic adjustments to normal wear and tear. We accomplish these objectives by first validating a scalable lumped parameter model that is based on a few prominent features in the vertical dynamics. A tunable controller based only on these features is developed and through simulations we show that the controller meets a set of standardized elevator performance tests while maintaining global exponential stability.

Analysis of a Pneumatically Coupled Cam-Actuated Mechanism

1981 ◽  
Vol 103 (3) ◽  
pp. 290-292
Author(s):  
S. LeQuoc ◽  
R. M. H. Cheng
Keyword(s):  
Amplitude Ratio ◽  
Nonlinear Function ◽  
Design Tool ◽  
Lumped Parameter Model ◽  
Design Parameters ◽  
Damping Factor ◽  
Resonance Amplitude ◽  
Orifice Area ◽  
Lumped Parameter ◽  
Wear And Tear

Cam-actuated mechanism with a pneumtic coupling is a design improvement upon the conventional system. Pneumatic dashpots are used which provide a cushioning effect, thus reducing the wear and tear of system components. This paper investigates the dynamic behavior of such a system based on a lumped parameter model with a damping factor which is a nonlinear function of the frequency. A digital computer is used as a design tool to determine the effect on the performance of changing design parameters. It is found that the system amplitude ratio peak depends largely upon the pneumatic damper orifice area and that a proper selection of the orifice area will yield a minimum resonance amplitude ratio.

scholarly journals A Distributed Lumped Parameter Model of Blood Flow

2020 ◽  
Vol 48 (12) ◽  
pp. 2870-2886
Author(s):  
Mehran Mirramezani ◽  
Shawn C. Shadden
Keyword(s):  
Blood Flow ◽  
Lumped Parameter Model ◽  
Lumped Parameter
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