Physical Model Experimental Study on Spalling Failure Around a Tunnel in Synthetic Marble

2019 ◽  
Vol 53 (2) ◽  
pp. 909-926 ◽  
Author(s):  
Guo-Qiang Zhu ◽  
Xia-Ting Feng ◽  
Yang-Yi Zhou ◽  
Zheng-Wei Li ◽  
Lian-Jie Fu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Physical Model ◽  
Spalling Failure

scholarly journals DEVELOPMENT OF PHYSICAL MODEL VEHICLE WITH REMOTIONAL CONTROL FOR EXPERIMENTAL STUDIES OF VEHICLE PROPERTIES

2020 ◽  
Vol 1 (46) ◽  
pp. 341-352
Author(s):  
Timkov O ◽  
◽  
Yashchenko D ◽  
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Remote Control ◽  
Physical Model ◽  
Large Scale ◽  
Experimental Studies ◽  
Scale Model ◽  
Recording Equipment ◽  
Control Equipment ◽  
The Future

The article is devoted to the development of the physical model of the vehicle, the equipment of the measuring, recording and remote control equipment for the experimental study of the properties vehicles. The construction of the physical model and the used electronic modules is described in detail, references are given to the application libraries and the code of the first part of the program for remote control. In the future, it is planned to develop a mathematical model of the movement of a passenger vehicle and to check its adequacy in conducting experimental studies on maneuverability on a physical model. The aim of the article is developed the physical model of the vehicle, equipped with measuring, recording and remote control equipment, for the experimental study of the properties of vehicle. Materials and research methods: development and designing (experimental research of properties of vehicles on the physical model); remote control; wheeled controlled module. The self-propelled large-scale model of the vehicle, reproducing a passenger car of the category M1, with a controlled wheelbase and a rear drive axle, has been developed. The model is equipped with the necessary measuring and recording equipment and remote control equipment. The software of the model allows you to implement both control manual and the given algorithm. In the future, it is planned to develop a mathematical model of the vehicle motion and to check its adequacy on the developed physical model. The obtained results will allow to improve not only the mathematical model, but also the experimental physical model and proceed further to the study of the properties of hybrid road trains with an active trailer link. KEY WORDS: VEHICLE, PHYSICAL MODEL, EXPERIMENT, STUDY, MODULE, MEMORY CARD, ACCELEROMETER, PROGRAM.

Experimental Research of New Rotor with Variable Clearance in Mixing the Short Fiber-Rubber Composite

2013 ◽  
Vol 706-708 ◽  
pp. 108-112
Author(s):  
Cai Jun Liu
Keyword(s):  
Experimental Study ◽  
Physical Model ◽  
Experimental Research ◽  
Short Fiber ◽  
Diameter Ratio ◽  
Rubber Composite ◽  
Material Mixing ◽  
The Ideal

The ideal effects of mixing the short fiber-rubber composite can not be reached under current conditions. This paper built the physical model for the short fiber mixes and disperses in rubber through studying the mixing mechanism of the short fiber-rubber composite. The new 6-wing synchronous rotor was designed according to the requirement of material mixing mechanism. The mixing requirement of the ordinary material and the reasonable length-diameter ratio of the short fiber could be met through changing the clearance gap between the rotor edge peak and mixer room. Finally, verify the theory through experimental study.

scholarly journals Experimental Study on the Influence of Berms and Roughness on Wave Overtopping at Rock-Armoured Dikes

2020 ◽  
Vol 8 (6) ◽  
pp. 446 ◽  
Author(s):  
Weiqiu Chen ◽  
Alberto Marconi ◽  
Marcel R. A. van Gent ◽  
Jord J. Warmink ◽  
Suzanne J. M. H. Hulscher
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Physical Model ◽  
Model Tests ◽  
Empirical Equations ◽  
Wave Overtopping ◽  
Dissipation Of Energy ◽  
Physical Model Tests ◽  
Weighting Coefficients

The average overtopping discharge is an important parameter for the design and reinforcement of dikes. Rock armour on the waterside slopes and berms of dikes is widely used to reduce the wave overtopping discharge by introducing slope roughness and dissipation of energy in the permeable armour layer. However, methods for estimating the influence of a rock berm and roughness of rock armour at dikes on the average overtopping discharge still need to be developed and/or validated. Therefore, this study aims to develop empirical equations to quantify the reductive influence of rock armour on wave overtopping at dikes. Empirical equations for estimating the effects of rock berms and roughness are derived based on the analysis of experimental data from new physical model tests. The influence of roughness of the rock armour applied on parts of waterside slopes is estimated by introducing the location weighting coefficients. Results show that the newly derived equations to predict the average overtopping discharge at dikes lead to a significantly better performance within the tested ranges compared to existing empirical equations.

scholarly journals A new approach to determine the discharge passing over ogee spillway

2019 ◽  
pp. 17-23
Author(s):  
Ali Yildiz ◽  
Alspan Yarar ◽  
Ali Ihsan Marti ◽  
Ozmur Kocaer
Keyword(s):  
Experimental Study ◽  
Physical Model ◽  
Experimental Results ◽  
Flow Depth ◽  
New Approach ◽  
Analytical Results ◽  
Analytical Formulas ◽  
Depth Curves

The main purpose of this study is investigation of flow over an ogee spillway experimentally and comparison with the analytical results. An experimental study was conducted to obtain discharges and heads over an ogee spillway. 30 different discharge and flow depths of flow in physical model were measured. Nondimensional discharge and flow depth curves are used to compare the results. Experimental results indicate that some regulations can be done in analytical formulas. In this way the analytical results can be get more accurately.

scholarly journals Experimental Study on Sorption and Desorption of NaCl to Sand Using a Physical Model

10.29007/r72k ◽  
2018 ◽  
Author(s):  
Zahra Mardani ◽  
Kumars Ebrahimi ◽  
Ali Jafari
Keyword(s):  
Experimental Study ◽  
Porous Media ◽  
Physical Model ◽  
Arid Areas ◽  
Saturated Porous Media ◽  
Sodium Ions ◽  
Adsorption Phenomenon ◽  
Semi Arid ◽  
Over Time ◽  
Soil Weight

In many parts of our planet, salinity has caused numerous problems in the production of goods, especially in arid and semi-arid areas, which account for one third of the planet's surface area. The main purpose of this article is to investigate the NaCl’s adsorption to and desorption from saturated porous media of sand. The NaCl solutions with the concentrations of 2.5, 5 and 10 g/l, and three types of soil textures with the weights of 50, 100 and 200g were used as samples of the experiments. The samples were placed in capped containers. The salinity of the solutions was measured using an EC-metre at 1, 2, 4, 7 and 24 hours from the beginning of the experiment. The results indicated that in the soils with less weight, the adsorption of sodium ions were more, and as soil weight increased, the adsorption of ions decreased, and finally the adsorption phenomenon was departed. Over time, the process of adsorption and desalination eventually stopped.

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