The method of reducing the dynamic loading of the support unit and the immediate roof rocks resulting from the successive operation of the safety valve during operation of the props in the regime of «equal resistance» is considered. In the developed working characteristic of hydraulic props of supporting units their overload protection is singled out into an independent function and is separated from the function of rock pressure control. The resistance of the hydraulic props of the support units to the roof rocks subsidence is regulated in a non-pulsed manner, and the movement of the support units can be carried out in a «non-unloading» mode. As a result, the static «trampling» of the intermediate roof is reduced, and in the regime of controlling the rock pressure, the dynamic impacts of the mechanized support on the intermediate roof are excluded. In this case, the protection of the support unit from overloads works only when the support is overloaded and does not directly participate in the formation of the process of rock pressure rock. The proposed non-pulse method provides controlled transmission of hydraulic energy with a small pressure drop from the head ends of the hydraulic props to the pressure line of the hydraulic system of the heading mechanized complex and its subsequent useful use.
The software for the procedure of definition of parameters of a cap of condenser structure with mobile facings on the basis of use of power action of an electrostatic field is considered. The offered technique allows on one operation of removal volt – capacitance characteristics to define the whole complex of the major parameters of a cap – size of a working air gap, a membrane deflection, electret surface potential and a membrane tension. The expressions for capacity of a cap as a function of specified parameters are obtained. The software is developed for the technique use, allowing to define required parameters of a cap and to estimate their error. The procedure considered in the present work is a not destroying monitoring.
Some designs of capacitor sensors and actuators which work is based on electric field use are considered. It is shown that these designs are rather cheap in manufacturing, but thus possess good technical characteristics. The theoretical substantiation of possibility of electrostatic forces use for balancing of a pressure difference in the corresponding measuring device is adduced. Procedure for definition of parameters of a condenser structure cap is considered. The procedure allows by means of one operation – volt-capacitance characteristic measuring – to define the whole complex of the major parameters of a cap-size of a working air gap, a membrane deflection, surface electret potential and a membrane tension. Analytical expression for capacitance of a cap depending on the specified parameters and measuring of its volt-capacitance characteristic allow to define these parameters by solving corresponding system of equations. The procedure considered in the present work is a method of a not-destroying control.
