12 results about "Fault rate" patented technology

The invention relates to a traction converter and control, fault processing and carrier phase shifting methods thereof. The traction converter comprises a first pre-charging loop and a second pre-charging loop that are connected with a secondary-side winding of the traction transformer respectively, a first four-quadrant rectifier module connected in series with the first pre-charging loop, a second four-quadrant rectifier module connected in series with the second pre-charging loop, an intermediate direct-current voltage loop with the input terminal connected with the output terminal of the first four-quadrant rectifier module and the output terminal of the second four-quadrant rectifier module, a first traction inverter module with the input terminal connected with the output terminal ofthe intermediate direct-current voltage loop, a second traction inverter module with the input terminal connected with the output terminal of the intermediate direct-current voltage loop, and an auxiliary inversion system with the input terminal connected with the output terminal of the intermediate direct-current voltage loop. According to the traction converter, the single four-quadrant rectifier module can work and the single traction inverter module can work; and the robustness is high, the fault rate is low, the size is reduced, and the cost is lowered.

The invention provides a method for optimizing a power grid planning scheme based on a comprehensive cost model. According to the method, the comprehensive cost model, which adopts the planning target age limit as a boundary and considers the annual cost and the current value of a planned scheme at the end of the year, is created. The calculating range of the model is the grid equipment (substations and transmission lines) which produces variable amount of costs in the scheme, wherein economic life of old equipment is needed to be forecasted to determine whether needing to update and when updating within the planning period. Meanwhile, fault rate forecast of new and old equipment within the planning period is trained and output through a least square support vector machine algorithm. In addition, when the comprehensive cost model is applied to comparing planning schemes, in order to reduce the influence on error of economic variables, an interval method is adopted. Numerical examples show that economic optimization of the power grid planning scheme is effectively realized by combining the comprehensive cost model with the interval method, and the comprehensive cost model is suitable for planning target age limits in various lengths.

The invention discloses a jet engine, which comprises a shell with exhaust holes, a rotor which is arranged in the shell and can be rotated, and at least one jet device, wherein the rotor is fixedly arranged on an output shaft supported by a bearing; the jet device is arranged on the periphery of the rotor and generates propulsion by combusting fuel gas to cause the rotor to rotate; and the jet device comprises a combustion chamber with a jet exhaust, an ignition device, an oxygen therapy trachea and a hydrogen therapy trachea. Compared with the prior piston type engine, the jet engine has the characteristics of simple structure, small volume, light weight, few components, easy processing and manufacture, low fault rate, low manufacturing and using cost, fast starting, high rotating speed, high efficiency of heat engine, high power, stable running, small noise, no air pollution, small abrasion of accessories, long service life and so on, and is suitable for various vehicles or power generating machines.

The invention relates to a combined type aerostatic bearing support mechanism, and belongs to the technical field of torque metering calibration. For improving support mechanisms at the middle parts of force arm levers of traditional standard torque generation devices, the combined type aerostatic bearing support mechanism with a symmetric structure is adopted, so that a series of problems in thetraditional structure are overcome, and the characteristics of reducing the realization difficulty and fault rate and prolonging the service life are increased. Correspondingly, the combined type aerostatic bearing support mechanism is capable of improving the force arm levers into single-beam double-arm symmetric frame structures, so as to effectively ensure the measurement correctness of the force arm levers on the basis of reducing the lever processing and assembling difficulty.

The invention discloses a temperature and pressure reducing valve which comprises a valve body, a temperature reducing water device is arranged at the bottom of the valve body, and a silencer is arranged at the position, located above the temperature reducing water device, in the valve body. According to the temperature and pressure reducing valve, the operating force of a valve rod and an executing mechanism is remarkably reduced through a pre-starting type balance valve element structure, the fault rate of the valve rod and the executing mechanism is reduced, the valve can be rapidly opened to guarantee the safety of a main system, and the pre-starting type balance valve element structure guarantees the sealing effect of the whole valve through two sealing pairs. Zero leakage after the valve is closed is achieved, the safety problem that the temperature behind the valve is high due to inner leakage of the valve is solved, inner leakage of the valve is avoided, the steam utilization rate is increased, temperature reduction water feeding is reduced, and the unit operation economical efficiency is effectively improved. Internal leakage of the valve is avoided, erosion of a silencer and the temperature reducing water device under the condition that steam flows abnormally is reduced, the reliability of the whole valve is improved, and the service life of the whole valve is prolonged.

The invention discloses a fixing device for a double-sided running groove of a high-speed steel rolling production line. The fixing device for the double-sided running groove of the high-speed steel rolling production line comprises a bottom cross beam (11) and a water beam (5). Two stand columns are arranged on the bottom cross beam (11) in a spaced manner. A pressing plate (7) is arranged at the upper ends of the stand columns. The pressing plate (7) is connected with the upper ends of the two stand columns. The bottom cross beam (11), the two stand columns and the pressing plate (7) form a frame-shaped structure. The double-sided running groove (4) and the water beam (5) are arranged in the frame-shaped structure, and the double-sided running groove (4) is arranged on the water beam (5). The pressing plate (7) is pressed on the double-sided running groove (4). By the adoption of the technical scheme, every assembly can be manufactured and replaced independently, the manufacturing technology and the material requirement are simple, the cost is low, the replacement and maintenance processes are simple, the double-sided running groove can be effectively protected against looseness and dislocation, the fault rate is low, the mounting time, the dismounting time and the fault treatment time of the running groove can be significantly shortened, and the labor intensity of operators is lowered.

The invention provides an electromagnetic bearing control method, device and system. The method comprises the steps of obtaining operation data, collected by a bearing controller, of a target electromagnetic bearing; inputting the operation data into a preset fault prediction model for fault prediction to obtain a fault prediction result; when the fault prediction result is that a fault exists, analyzing the operation data to determine a fault type; and performing operation control on the bearing controller according to the fault type. Therefore, possible faults are predicted by collecting the operation data of the electromagnetic bearing through the bearing controller, when it is predicted that the bearing faults will occur, the fault type is determined according to the operation data, then operation control is conducted on the bearing controller, and the bearing operation fault rate and the rotor damage rate are reduced by conducting control intervention in advance; the bearing control performance is improved, the control effect is improved, and the stability of the whole system is improved.