35results about How to "Hysteresis effect is small" patented technology

The invention discloses an underground water flow direction, speed and mass flow monitoring method. Underground water flow direction logging or hydrological logging is a technical means for obtaining underground water flow information through a drill hole or a monitoring well. An array sensor is located in a well logging; the array sensor comprises a cylindrical shell, a heating body, a temperature sensor and an orientation sensor; the size of the cylindrical shell is the same as that of the inner wall of the logging well; the heating body is arranged at the central position of the cylindrical shell; the bottom surface of the cylindrical shell is uniformly divided into N fan-shaped sub-areas along the circumference by taking the heating body as the center, and each sub-area is provided with a temperature sensor; an orientation sensor is arranged on each temperature sensor and is used for monitoring the azimuth angle of the temperature sensor; data collected by the array sensor is transmitted to the controller, and the flow speed, the water flow direction and the total mass flow rate of water flow are obtained through calculation. According to the invention, the measurement difficulty of a heterogeneous aquifer and a thin aquifer is overcome, and wider and more accurate monitoring of the aquifer environment is realized.

This invention relates to the field of attitude stabilization and active vibration control technology for tunneling machines, and discloses a magnetorheological active anti-instability and vibration suppression attitude stabilization system for a steep inclined shaft tunneling machine. The system includes an anti-roll bar assembly, a magnetorheological actuator, an attitude sensing unit, a vibration sensing unit, a drive unit, and a main controller. The main controller performs frequency domain decoupling filtering on the three-dimensional attitude signal and the three-axis vibration acceleration signal, separating the low-frequency reference attitude offset and the high-frequency vibration acceleration characteristic quantity, and calculating the anti-instability foundation support current and the vibration suppression damping compensation current respectively. It then calculates the control weights based on contact pressure data and weightedly fuses the two currents to generate a comprehensive target drive current. The drive unit adjusts the excitation current according to the comprehensive target drive current to change the apparent yield stress of the magnetorheological fluid. This invention reduces control interference in attitude stabilization support and high-frequency vibration reduction, and improves operational stability under complex conditions of steep instability.