Development of airplane stability and control technology /1970 Von Karman Lecture/

1970 ◽  
Vol 7 (4) ◽  
pp. 290-301 ◽  
Author(s):  
COURTLAND D. PERKINS
Keyword(s):  
Control Technology ◽  
Stability And Control ◽  
Von Karman ◽  
Von Kármán ◽  
And Control

Piezoelectric Actuation of von Karman Circular Plates With Thermal Deformation and Nonlinear Oscillation

1995 ◽  
Author(s):  
H. S. Tzou ◽  
Y.-H. Zhou
Keyword(s):  
Circular Plate ◽  
Nonlinear Effects ◽  
Thermal Buckling ◽  
Control Effect ◽  
Control Moment ◽  
Von Karman ◽  
Equivalent Control ◽  
High Control ◽  
Von Kármán ◽  
And Control

Abstract Linear dynamics and distributed control of piezoelectric laminated continua have been intensively studied in recent years. In this study, dynamics, electromechanical couplings, and control of thermal buckling of a piezoelectric laminated circular plate with an initial nonlinear large deformation are investigated. It is assumed that the von Karman type geometrically nonlinear deformation is considered. In addition, the piezoelectric layers are uniformly distributed on the top and bottom surfaces of the circular plate. Accordingly, control effect is introduced via an equivalent control moment on the circumference. Dynamic equations and boundary conditions including elastic and piezoelectric couplings are formulated, and solutions are derived. Active control of plate’s nonlinear deflections, thermal buckling, and natural frequencies using high control voltages are studied, and their nonlinear effects are evaluated.

On the Stability and Control Technology of the Side Slope of the Tunnel Entrance

2014 ◽  
Vol 488-489 ◽  
pp. 737-740
Author(s):  
Xiao Wei Du ◽  
Yong Tao Gao
Keyword(s):  
Control Measures ◽  
Effective Control ◽  
Control Technology ◽  
Tunnel Engineering ◽  
Stability And Control ◽  
Side Slope ◽  
Scientific Analysis ◽  
The Stability ◽  
And Control ◽  
Tunnel Entrance

In our country, the progress lag even casualties caused by landslide or collapse of tunnel portal occurs from time to time, so how to make scientific analysis on the stability of side slope of the tunnel entrance and put forward effective control technology are important problems urgent to solve in tunnel engineering. This paper mainly analyzes the influencing factors of stability of side slope of the tunnel entrance and failure mode of side slope and puts forward the corresponding control measures to ensure the safety of the tunnel construction.

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