54results about How to "Eliminate influencing factors" patented technology

In order to solve the problem of low reliability of parallel operation of generator sets in the prior art, the present invention provides a phase synchronization method for parallel operation of multiple generator sets. The generator set includes an engine generator, a rectifier unit, an inverter unit and an output filter. It also includes a main control unit and a throttle control unit; it also includes a current sampling unit, a voltage sampling unit and a voltage zero-crossing unit, and the output ends of the output filtering unit are respectively connected with the current sampling unit, the voltage sampling unit and the voltage zero-crossing unit. In this application, the actual output current of the generator set, the value of the output voltage, and the time difference between the actual zero-crossing point of the output voltage and the software zero-crossing point are collected, and compared with the preset value in the main control unit of the generator set, the period of the output voltage is adjusted. The value and voltage amplitude, the phase of synchronous output voltage, the power distribution of different units in parallel, improve the reliability of parallel operation of generator sets, and improve the efficiency and economy of unit operation.

The invention particularly discloses a compensation method of a steel ball surface detect measuring system based on optical fiber sensing. The compensation method of the steel ball surface detect measuring system based on optical fiber sensing comprises the following steps: step 1, for a sensor structure that a single optical fiber transmits scattered light and a plurality of groups of optical fibers receive scattered light, measuring by an optical power meter so as to obtain detection incidence power P0 and corresponding light power P1, P2,..., and Pn received by multiple groups of optical fibers; step 2, collecting data of the light power P1, P2,..., and Pn which are obtained in the step 1 by a multi-path high-speed synchronous data collecting plate, thereby obtaining digital signals with N light intensity; summing the N groups of light intensity so as to obtain P=P1+P2+P3+...+Pn; step 3, carrying out division operation on the P, P1, P2, ..., and PN which are obtained from the step 2, that is, dividing multiple groups of received light intensity by each group of received light intensity so as to obtain specific values P / P1, P / P2, ..., and P / P(n-1), thereby obtaining the light intensity specific values when the sensor and a measured surface are oblique at different angles; step 4, establishing a function of a clearance varying along with the specific value; step 5, determining the coefficients a0, a1, a2, ..., and a(n-1); and step 6, substituting the coefficient values from the step 5 into the formula (1), thereby obtaining the accurate gap value.

The invention discloses a method for controlling liquid level of non-contact liquid filling by positive pressure method, which belongs to the technical field of filling. It includes the following steps: S1, inserting a measuring conduit into the container to be filled, and the nozzle is located at a specified height in the container to be filled; S2, providing a constant positive pressure to the measuring conduit; S3, obtaining the filling liquid state during filling The pressure change in the measuring conduit caused by the material reaching the specified height of the filled container; S4. After the pressure change reaches the set value, a signal is sent to stop filling; S5. After stopping the filling, use the measuring conduit to pump liquid to make the filled container The liquid level of the internal liquid material drops to the level of the nozzle. The invention introduces a constant positive pressure into the measuring conduit, and when the liquid level reaches the height of the nozzle surface of the measuring conduit during filling, it can cause obvious pressure changes in the measuring conduit, thereby accelerating the process of the pressure change reaching the set value, and quickly Timely control of filling stop, small filling error, accurate liquid level control and increased filling efficiency.

The invention discloses a method of planting lotus root. The method of planting the lotus root comprises the following steps of (1) selection of a lotus root field; (2) construction of a lotus root pond; (3) selection and processing of lotus seeds; (4) planting; (5) field managing: A, germination period; B, vigorous growth period; C, lotus root growth period; (6) water management; and (7) harvesting. The method of planting the lotus root is simple and easy to implement and can significantly increase the yield of the lotus root; the lotus root obtained by using the method is crisp and tender and has lots of moisture and good taste; by using a lotus root cultivation substrate, the application of chemical fertilizers is significantly reduced, the quality of the lotus root is effectively improved, the cost is reduced, and at the same time, the harm to the environment is reduced. According to the lotus root cultivation substrate, through the reasonable addition of bone powder and eggshell powder, phosphorus can be effectively supplemented in original soil; through the addition of green manure, nitrogen fertilizer and potash fertilizer are supplemented; the addition of vermiculite in thelotus root cultivation substrate can increase the permeability of the substrate, is conducive to the growth of the lotus root, and at the same time facilitates the digging out of the lotus root in the later period.

The invention discloses a pneumatic control-based multi-filament spiral contact testing device inside a hoisting wire rope and a testing method thereof. Controlled wire rope internal multi-wire loading mechanism and drum loading mechanism. The multi-wire spiral contact test device inside the hoisting steel wire rope based on pneumatic control in the present invention can realize the working condition of the multi-wire spiral contact inside the steel wire rope strand on one experimental device, and truly simulate the friction and wear between the steel wires inside the steel wire rope strand and the steel layer There are two kinds of motion behaviors of friction and wear between the steel layer. The experimental device adopts pneumatic control to realize the adjustable and controllable loading force of each part, which makes the control process easier and the experimental data more accurate.

The invention discloses a negative pressure non-contact liquid filling method for controlling liquid level, which belongs to the technical field of filling. It includes the following steps: S1, inserting a measuring conduit in the container to be filled, and the nozzle is located at a specified height in the container to be filled; S2, providing a constant negative pressure to the measuring conduit; S3, obtaining the filling liquid state during filling The pressure change in the measuring conduit caused by the material reaching the specified height of the filled container; S4. After the pressure change reaches the set value, a signal is sent to stop filling; S5. After stopping the filling, use the measuring conduit to pump liquid to make the filled container The liquid level of the internal liquid material drops to the level of the nozzle. The invention introduces a constant negative pressure into the measuring conduit, and when the liquid level reaches the height of the nozzle surface of the measuring conduit during filling, it can cause obvious pressure changes in the measuring conduit, thereby accelerating the process of the pressure change reaching the set value, and quickly Timely control of filling stop, small filling error, accurate liquid level control and increased filling efficiency.