scholarly journals Experimental Evaluation of Multiple Frost Heaving Parameters for Preflawed Granite in Beizhan Iron Mining, Xinjiang, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yu Wang ◽  
Dayu Long ◽  
Zulifeiya Rejuti ◽  
Huajian Wang
Keyword(s):  
Force Measurement ◽  
Frost Heaving ◽  
Migration Ability ◽  
Water Ice ◽  
Steady Stage ◽  
Mechanical Weathering ◽  
The Stability ◽  
Cement Strength ◽  
Force Measurement System ◽  
Rock Lithology

Ice-driven mechanical weathering in cold regions is considered a main factor impacting the stability of rock mass. In this work, the response surface method (RSM) was employed to evaluate and optimize the multiple frost heaving parameters to seek the maximum frost heaving force (FHF), in combination with experimental modeling based on a specially designed frost heaving force measurement system. Three kinds of rocks were prepared with parallel flaws in it having different flaw width, length, and cementation type, and these factors were used to fit an optimal response of the maximum FHF. The experimental results reveal five distinguished stages from the frost heaving force curve, and they are inoculation stage, explosive stage, decline to steady stage, recovery stage, and sudden drop stage. The sensitivity analysis reveals the influential order of the considered factors to peak FHF, which is the rock lithology, flaw width, flaw cement type, and flaw length. For low-porosity hard rock, increasing flaw width, flaw length, and flaw cement strength can improve the probability of frost heaving failure. It is suggested that rock lithology determines the water migration ability and influences the water-ice phase transformation a lot.

scholarly journals Experimental Investigation on Frost Heaving Force (FHF) Evolution in Preflawed Rocks Exposed to Cyclic Freeze-Thaw Conditions

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yu Wang ◽  
Tao Sun ◽  
Haonan Yang ◽  
Jinfeng Lin ◽  
Hao Liu
Keyword(s):  
Frost Heaving ◽  
Cycle Number ◽  
Recovery Stage ◽  
Water Ice ◽  
Freeze Thaw ◽  
Structural Deterioration ◽  
Steady Stage ◽  
Mesoscopic Structure ◽  
Evolution Characteristics ◽  
Peak Value

This work is aimed at investigating the structural deterioration and the frost heaving force evolution characteristics of flawed rocks using a self-developed frost heaving force (FHF) measurement system. Three kinds of preflawed rocks with different flaw geometry parameters were used to conduct the FHF measurement tests. The testing results reveal five distinguished stages from the frost heaving force evolution curve; they are the inoculation stage, explosive stage, decline to steady stage, recovery stage, and sudden drop stage. In addition, a secondary frost heaving phenomenon is found, and the secondary peak value is lower than the initial peak value. Moreover, the FHF decreases with increasing the F-T cycle number, and its decreasing rate becomes faster at a high F-T cycle. The frost heaving force is affected not only by flaw geometry but also by the lithology. For low-pore hard rock, damage propagates quickly after the occurrence of freeze-thaw damage. It is suggested that the mesoscopic structure of rock affects the water migration and water-ice phase transformation, and rock can be fractured by FHF in the preexisting flaws.

scholarly journals An fMRI-compatible force measurement system for the evaluation of the neural correlates of step initiation

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Andrea Cristina de Lima-Pardini ◽  
Raymundo Machado de Azevedo Neto ◽  
Daniel Boari Coelho ◽  
Catarina Costa Boffino ◽  
Sukhwinder S. Shergill ◽  
...  
Keyword(s):  
Measurement System ◽  
Force Measurement ◽  
Neural Correlates ◽  
Step Initiation ◽  
Force Measurement System

Design and Development on Piezoelectric Ceramic Type Insole 3D Force Measurement System Based on LabVIEW

2011 ◽  
Vol 383-390 ◽  
pp. 774-779
Author(s):  
Ye Min Guo ◽  
Lan Mei Wang ◽  
Rui Yong Xue
Keyword(s):  
Shear Stress ◽  
Measurement System ◽  
Plantar Pressure ◽  
Piezoelectric Ceramic ◽  
Force Measurement ◽  
Stress System ◽  
Scientific Methods ◽  
Lab View ◽  
Design Requirements ◽  
Force Measurement System

According to the requirements of measurement of plantar pressure and shear stress in the meantime, this thesis puts forward a plan to construct a new insole plantar pressure and shear stress system based on multifunction data acquisition modular and Lab VIEW. Then the hardware part and software part are designed and developed respectively. There are 3 sensors are arrayed at each measurement point, that means 3 sensors are assembled in 3 different directions of X,Y and Z . The piezoelectric ceramic type sensors are designed, manufactured and calibrated according to scientific methods. Meanwhile, the DAQ card is selected carefully. Of course, the software part is developed based on Lab VIEW. A series of tests are performed in order to validate the function of the measurement system. The results satisfy the anticipated design requirements. At last, the problems and application trend of the measurement system are predicted.

Robust Impedance Control of Manipulators Carrying a Heavy Payload

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Farhad Aghili
Keyword(s):  
Force Measurement ◽  
Impedance Control ◽  
Stability And Convergence ◽  
Robot Dynamics ◽  
Control Input ◽  
Heavy Load ◽  
Impedance Model ◽  
Force Moment ◽  
Loop Feedback ◽  
The Stability

A heavy payload attached to the wrist force/moment (F/M) sensor of a manipulator can cause the conventional impedance controller to fail in establishing the desired impedance due to the noncontact components of the force measurement, i.e., the inertial and gravitational forces of the payload. This paper proposes an impedance control scheme for such a manipulator to accurately shape its force-response without needing any acceleration measurement. Therefore, no wrist accelerometer or a dynamic estimator for compensating the inertial load forces is required. The impedance controller is further developed using an inner/outer loop feedback approach that not only overcomes the robot dynamics uncertainty, but also allows the specification of the target impedance model in a general form, e.g., a nonlinear model. The stability and convergence of the impedance controller are analytically investigated, and the results show that the control input remains bounded provided that the desired inertia is selected to be different from the payload inertia. Experimental results demonstrate that the proposed impedance controller is able to accurately shape the impedance of a manipulator carrying a relatively heavy load according to the desired impedance model.

Testing the retention of attachments for implant overdentures – validation of an original force measurement system

2009 ◽  
Vol 37 (1) ◽  
pp. 54-62 ◽  
Author(s):  
O. FROMENTIN ◽  
C. LASSAUZAY ◽  
S. ABI NADER ◽  
J. FEINE ◽  
R. F. De ALBUQUERQUE JUNIOR
Keyword(s):  
Measurement System ◽  
Force Measurement ◽  
Force Measurement System

Development of Piston Friction Force Measurement System

2002 ◽  
Vol 26 (8) ◽  
pp. 1608-1614
Author(s):  
Gyeong-Pyo Ha ◽  
Jung-Su Kim ◽  
Myeong-Rae Jo ◽  
Dae-Yun O
Keyword(s):  
Friction Force ◽  
Measurement System ◽  
Force Measurement ◽  
Force Measurement System
Sign in / Sign up

Export Citation Format

Share Document