KEYWORDS: Pollution, Control systems, Physics, Mechanical engineering, Performance modeling, Fluid dynamics, Resistance, Process control, Digital image processing, Current controlled current source
According to accident in Dalian New Port, The automatic close valve of isolating pollution in-situ is put forward.
Form model on bond grand of valve to study the valve's open and close performance and dynamic response. Reveal the
influence rule of pressure variation and load variation for the valve. Provide a theoretical basis for proper design and
controlling of the valve.
The hydraulic vibration system controlled by wave exciter is a mechanic-electric-fluid integration system, and it has high
dynamic characteristics. Modeling and simulation for it has come to professional's attention in the field of hydraulic
vibration industry, because it is nonlinear and complex. In this paper, a method has been proposed. By using power bond
graph method, the bond graph model for it can be established, meanwhile, it is proposed that controlled parameters are
considered to join the model, in order to control power flow alternated; and the mathematical model(state equations) of
this system can be built according to bond graph theory and controlled relations; then simulation model can be built by
using Matlab/Simulink software, the model can intuitively express system's power flow direction and controlled
relations. To the question that stiff equation appears easily in model of hydraulic system, we can choose the adapting
algorithm offered by Matlab software to obtain the more precise simulation results.
The drainage system of mine has strict requirement to its equipments for the special work environment of the mine. The
controllability of the shut-off valve is a key in the automatic drainage system. This paper presented the design scheme of
the controllable shut-off valve according to the real condition of drainage system in mine. The paper built geometric
model and mathematic model of the hydraulic controllable shut-off valve by using FLUENT dynamic mesh technology,
and carried on the numerical simulation to its internal flow field, and analyzed the analog result. From the analysis
results, it can see that, when the valve's closure or open velocity is bigger than 0.01 m/s, the phenomenon of pressure
fluctuation and the water hammer would occur easily.
KEYWORDS: Mining, Control systems, Fluctuations and noise, Sensors, Magnetic sensors, Magnetism, Analytical research, Astatine, Safety, Automatic control
In the mine pit using the "U" ventilation systems, there is serious gas accumulating phenomenon nearby upper corner. If not effectively in time, the serious coal mine security accident will exist because of the gas ultra to limit. Through analysis to the gas accumulation reason and the distribution rule nearby upper corner, the situation is understood that the wind speed is extremely low near upper corner region and some parts is at eddy flow status; Using the practical and economical real-time monitoring system, accumulative gas can be scattered through the air flow perturbation of hydraulic blower. This method could reduce partial gas concentration of upper corner in order to meet the coal mine security production requirements
The concentration pond is used in the most coal washing plants for treating coal washing water. We must know the coal
mud contact surface in the use of concentration pond so that we can prevent presses the rake accident appears and that
simultaneously know how to operate next step for worker. Formerly we survey coal mud contact surface depended on
the man-power. People with one thin wooden stick insertion concentration pond in and after mentioned remains with the
naked eye observation to the thin wooden stick coal mud trace and to estimate the deep of coal mud contact surface. Like
this there are some questions of existence lag and accurate bad. So I propose one kind of coal mud contact surface
indirect survey technology. First, I survey the different depth coal washing water density using density meter and I get a
coal washing water density gradient. Then, according to the gradient I can establishment the coal washing water density
mathematical model. Because coal washing water density is changed with different seasons, so I get different coal
washing water density mathematical model. Finally, I fix the density meter to one depth place to get the water density
and then put the density in the mathematical model to calculate the contact surface depth value. All the mathematical
computation depends upon LABWIEV software at the same time can realized coal mud contact surface depth value
digital display.
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