Comparing GCL Performance Using Rigid Versus Flexible Wall Permeameters

2008 ◽  
pp. 110-110-8
Author(s):  
GR Koerner
Keyword(s):  
Flexible Wall

Measuring flow functions with the Flexible Wall Biaxial Tester

2005 ◽  
Vol 158 (1-3) ◽  
pp. 34-44 ◽  
Author(s):  
R.J.M. Janssen ◽  
M.J. Verwijs ◽  
B. Scarlett
Keyword(s):  
Flexible Wall ◽  
Flow Functions

scholarly journals Frequency–Amplitude Relationship of a Nonlinear Symmetric Panel Absorber Mounted on a Flexible Wall

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1188
Author(s):  
Yiu-Yin Lee
Keyword(s):  
Elliptic Integral ◽  
Algebraic Equations ◽  
Cavity Depth ◽  
Nonlinear Algebraic Equations ◽  
Flexible Panel ◽  
Flexible Wall ◽  
Elliptic Integral Method ◽  
Flexible Panels ◽  
Relationship Of ◽  
Panel Absorber

This study addresses the frequency–amplitude relationship of a nonlinear symmetric panel absorber mounted on a flexible wall. In many structural–acoustic works, only one flexible panel is considered in their models with symmetric configuration. There are very limited research investigations that focus on two flexible panels coupled with a cavity, particularly for nonlinear structural–acoustic problems. In practice, panel absorbers with symmetric configurations are common and usually mounted on a flexible wall. Thus, it should not be assumed that the wall is rigid. This study is the first work employing the weighted residual elliptic integral method for solving this problem, which involves the nonlinear multi-mode governing equations of two flexible panels coupled with a cavity. The reason for adopting the proposed solution method is that fewer nonlinear algebraic equations are generated. The results obtained from the proposed method and finite element method agree reasonably well with each other. The effects of some parameters such as vibration amplitude, cavity depth and thickness ratio, etc. are also investigated.

Towards a more rational approach to chemical compatibility testing of clay

2002 ◽  
Vol 39 (3) ◽  
pp. 597-607 ◽  
Author(s):  
J K Kodikara ◽  
F Rahman ◽  
S L Barbour
Keyword(s):  
Boundary Condition ◽  
Hydraulic Conductivity ◽  
Rigid Wall ◽  
New Technique ◽  
Rational Approach ◽  
Lateral Strain ◽  
Test Results ◽  
Chemical Compatibility ◽  
Test Technique ◽  
Flexible Wall

Chemical compatibility tests using hydraulic conductivity testing with chemical permeants are normally undertaken to assess the integrity of compacted clayey liners used for waste containment. This paper highlights the fact that current routine methods of flexible wall and rigid wall testing techniques fail to represent the zero lateral strain boundary condition that is required to realistically represent the field situation. The test results indicate that flexible wall permeameters underestimate the likely increases in hydraulic conductivity due to chemicals, while the rigid wall permeameters can severely overestimate these effects. A new test technique, which incorporates the zero lateral strain condition in a simple manner, is presented. This technique involves the use of a rigid wall concept in a flexible wall permeameter. A split rigid mould is used to encase the soil specimen that is glued to the internal surfaces of the mould, to apply the zero lateral strain boundary condition. The new technique is shown to be suitable for both chemical compatibility and desiccation testing. The tests were undertaken with varying concentrations of saline water, methanol, and landfill leachate. The test results indicate that the new technique produces results that fall between the results obtained from flexible wall and rigid wall permeameters. It is argued that the new test technique provides a more rational approach for chemical compatibility testing than the current rigid wall and flexible wall techniques.Key words: soil, hydraulic conductivity, chemical compatibility, landfill, permeameter, boundary condition.

A flexible wall permeameter for measurements of water and air coefficients of permeability of residual soils

2003 ◽  
Vol 40 (3) ◽  
pp. 559-574 ◽  
Author(s):  
Agus Setianto Samingan ◽  
Eng-Choon Leong ◽  
Harianto Rahardjo
Keyword(s):  
Flow Rate ◽  
Unsaturated Soils ◽  
Temperature Fluctuations ◽  
Air Permeability ◽  
Matric Suction ◽  
Residual Soils ◽  
Volume Changes ◽  
Flexible Wall ◽  
Drying And Wetting Cycles ◽  
Suction Flow

This paper describes the development of a flexible wall permeameter apparatus for measuring the water and air coefficients of permeability of residual soils. Water and air coefficients of permeability were obtained for both the drying and wetting cycles for residual soils using the flexible wall permeameter. Volume changes of the soil specimens during unsaturated consolidation and during the water and air permeability measurements were also monitored. Factors that influence the measurements, such as hydraulic and pneumatic gradients and temperature fluctuations are described and discussed in this paper. The developed flexible wall permeameter was found to be capable of measuring water and air coefficients of permeability as low as 10–12 m/s.Key words: flexible wall permeameter, permeability, residual soils, unsaturated soils, matric suction, flow rate.

scholarly journals Oscillations of a channel with a flexible wall conveying viscous flow

PAMM ◽  
2012 ◽  
Vol 12 (1) ◽  
pp. 245-246 ◽  
Author(s):  
Karolina Bach ◽  
Hartmut Hetzler ◽  
Wolfgang Seemann
Keyword(s):  
Viscous Flow ◽  
Flexible Wall

Mechanics Analysis and Dynamic Modeling of a Wall Climbing Robot

2013 ◽  
Vol 753-755 ◽  
pp. 2001-2005
Author(s):  
Wei Jie Bo ◽  
Xue Shan Gao ◽  
Fang Xing Li ◽  
Yi Tong Ma ◽  
Yun Fei Cui
Keyword(s):  
Dynamic Model ◽  
Lagrange Equation ◽  
Analysis Method ◽  
Climbing Robot ◽  
Centrifugal Blower ◽  
Effective Utilization ◽  
Velocity Function ◽  
Flexible Wall ◽  
Optimization Mechanism ◽  
Driving Torque

A kind of theoretical analysis method in wall climbing robot design is presented in this paper. Using this method, a flexible wall climbing robot is developed that can be well adopted in small irregular places. Firstly, an optimization mechanism is given based on the effective utilization of aerodynamic attraction produced by a centrifugal blower. Kinematics model of the robot is represented, then linear velocity function and angular velocity function of the robot are deduced. Dynamic model based on Lagrange equation is established, which can be a theoretical foundation for control system design. Finally, simulation results show that the dynamic model and the method are reliable since the curves of driving torque match the change of negative pressure.

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