Nonlinear analytical model of the ‘foundation slab-soil base’ system

1990 ◽  
Vol 27 (3) ◽  
pp. A175
Keyword(s):  
Analytical Model ◽  
Base System ◽  
Soil Base ◽  
Foundation Slab ◽  
Nonlinear Analytical Model

scholarly journals Nonlinear Analytical Model of Two Weakly Coupled MEMS Cantilevers for Mass Sensing Using Electrostatic Actuation

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1084
Author(s):  
Toky Rabenimanana ◽  
Vincent Walter ◽  
Najib Kacem ◽  
Patrice Le Moal ◽  
Joseph Lardiès
Keyword(s):  
Analytical Model ◽  
Beam Theory ◽  
Continuous System ◽  
Mode Localization ◽  
Dc Voltage ◽  
Weakly Coupled ◽  
Flexible Supports ◽  
Nonlinear Analytical Model ◽  
Mems Mass Sensor ◽  
Mems Cantilevers

This paper presents a nonlinear analytical model of MEMS mass sensor, which is composed of two cantilevers of 98 µm and 100 µm length, 20 µm width and 1.3 µm thick. They are connected by a coupling beam and only the shortest cantilever is actuated by a combined AC-DC voltage. The DC voltage is used to equilibrate the system and the phenomenon of mode localization is investigated when a mass perturbation is applied. The sensor is modeled as a continuous system with beam theory and non-ideal boundary conditions are considered by using flexible supports. With a low AC voltage of 10 mV, a DC voltage of 5.85 V can counterbalance the length difference. This DC voltage decreases at 5.60 V when we increase the AC voltage, due to the effect of electrostatic nonlinearities. For a relative added mass of 0.1%, the amplitude change in the two cantilevers is more important when the coupling is weaker.

scholarly journals THE REACTIVE CAPACITY OF THE SOIL BASES OF GRAVITY-TYPE QUAY WALL

World Science ◽  
2019 ◽  
Vol 1 (9(49)) ◽  
pp. 16-19
Author(s):  
Natela Khoneliia ◽  
Svetlana Bugaeva
Keyword(s):  
Stress State ◽  
Earth Pressure ◽  
Base System ◽  
Soil Base ◽  
Lateral Earth Pressure ◽  
Quay Wall ◽  
Wide Range ◽  
Reactive Capacity ◽  
Limit Stress ◽  
Foundation Structure

The results of studies of the reactive capacity of the soil base of a gravity- type quay-wall on the basis of the method developed for calculating the “structure - soil base” system are considered. The method proposed allows determining the reactive capacity of the soil base in conditions of mixed stress state model (limit and sublimit stress state of the soil base) under and around of the base of the foundation structure in a wide range of loads of lateral earth pressure. The transformation of limit and sublimit stress state zones of the soil base on the basis of numerical modeling is presented which shows an increase of the sizes of limit stress state and a decrease of the sizes of sublimit stress state.

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