54 results about "Corrective maintenance" patented technology

A method to determine corrective actions of a nuclear steam generator, having the steps of modeling of steam generator tube and deposit heat transfer characteristics by analytically deriving specific deposit characteristics and descriptive model parameters, wherein the modeling uses historical thermodynamic data for an operating plant under evaluation, identifying a set of one of preventive and corrective maintenance alternatives to accomplish steam generator deposit objectives, determining through the modeling a power production impact of each of the set of one of preventative and corrective maintenance alternatives to determine an economic cost for each of the set of preventative and corrective maintenance alternatives, and initiating a maintenance alternative with a lowest economic cost as compared to the maintenance evaluation alternatives with higher economic costs.

The invention discloses a wind power plant power external characteristic modeling method. The method comprises the following steps of based on average wind velocity obtained by a wind measuring tower in a wind power plant region, in consideration of fan arrangement and wind direction, calculating average input wind speed at hub height of each fan in the wind power plant through a wake model, and building wind speed spatial distribution in the wind power plant; in consideration of own paddle rotary sampling of fan and fan inertia, converting the average wind speed at the hub height into an equivalent wind speed time sequence at a rotating shaft; in consideration of spatial transmission of wind speed, calculating time delay of wind speed from an upstream set to a downstream set, obtaining equivalent wind speed time sequence based on consideration of time delay, and building a complete wind power plant wind speed spatial-temporal distribution; and in consideration of conditions of pitch angle, yaw angle and fan corrective maintenance, calculating wind power output based on consideration of wind power plant control and operating state. Feasibility and reasonability of the provided method are verified by a simulation example on the basis of geographic data and fan parameters of a certain actual wind power plant. The modeling method has good promotional value and application prospect.

Predictive analysis systems and methods use and correlate data from historic events to identify trends and develop corrective maintenance and logistics actions in various technology areas, such as the transportation industry, the manufacturing industry, or any other suitable industry that experiences equipment failure. The predictive analysis method and also determines the adequacy and compliance of the requirements prior to the failure of a system in order to preemptively minimize and eliminate these negative outcomes. Current failure trends may be evaluated for one or several components of a given system, which may be the frequency of incidence of failure of one or more components of the system. Engineering instructions for repair may also be evaluated when a failure of one or more components of the system has taken place. On the basis of this information, future failure trends may be forecast and supply channels and maintenance and repair protocols may be updated in order to decrease component failure.

A manufacturing system predictive maintenance method based on task reliability status, the steps are as follows: 1. Establish the basic database of the manufacturing system; 2. Use the basic data to analyze the trend of equipment performance and various related parameters; 3. Predict the correctness of equipment Maintenance costs; 4. Forecast equipment maintenance costs; 5. Forecast equipment processing capacity loss costs; 6. Forecast equipment indirect loss costs; 7. Forecast equipment product quality loss costs; 8. Forecast comprehensive costs and determine the equipment task reliability threshold , and then determine the best predictive maintenance strategy; 9. According to the results of step 8, determine the task requirements of the previous equipment, and repeat steps 2-8 until the formulation of the predictive maintenance strategy for the entire manufacturing system is completed; 10. Results analysis; passed The above steps achieve the engineering purpose of combining equipment performance status with production tasks, and solve the problem of traditional condition-based maintenance ignoring production status and the blindness of periodic maintenance.

The invention relates to an active pitch control system of a wind driven generator, which realizes special working condition processing logic in a motor driver at the bottom layer of the active pitch control system and direct control on a blade angle. For various special working conditions possibly occurring in the site operation of the wind driven generator, a series of motion measures are adopted in the active pitch control system to ensure safety shut-down, corrective maintenance and normal power generation production of the wind driven generator. The active pitch control system of the wind driven generator with special working condition processing logic has the advantages of reliable safety and remarkable economic benefit.

Method for measuring torque in rotating-equipment, turbo-machinery, pumps, turbines, and compressors. The measured torque can be used as an input to control torque, power, or energy efficiency. The method can also measure force (or torque) in traversing-machinery or vehicles such as automobiles, ships, aircraft, bicycles and motorcycles. The method takes real-time rotating (or linear) speed measurements, applies the discrete form of equations of motion, captures the natural decay curve(s) of the machine to estimate the torque (or force) associated with the losses of the power sink, and then solves for the driving torque of the power source. The method relates to monitoring and control systems used to safely and efficiently operate rotating-equipment and traversing-machinery. The method can be used to determine a health index of a machine to make predictive and corrective maintenance, reliability, performance, safety, and efficiency-related decisions. It is accurate, robust, lightweight, space-saving, and low cost.

In a complex plant most of the problems or errors will occur only once. Therefore corrective maintenance and trouble-shooting staff can not go back or hark back to ready-made solutions for these problems or errors. The present invention provides a method and a computerized system which enables the corrective maintenance and trouble-shooting staff having access to experiences made on third party plants regarding these problems or errors.

The invention provides a power transformer state evaluation method and system based on electriferous detection. The method comprises the steps that real-time state quantity data of a transformer to be evaluated are obtained; an established evaluation model is used for evaluating the real-time quantity data to obtain a state evaluation result of the transformer to be evaluated, wherein the evaluation model is established according to the initial state quantity of the transformer to be evaluated. According to the evaluation method, the evaluation model which is established in advance is used for accurately reflecting features and attributes of the transformer, the transformer can be overhauled according to the obtained state evaluation result in a targeted mode, preventive measures are taken, thus, the problems that in the prior art, manpower and material resources are wasted and operation and the available rate of a transformer are affected due to the fact that schedule maintenance and corrective maintenance are conducted on the power transformer are solved; moreover, the evaluation process is visual, simple and easy to grasp, and high practicability is achieved.

A method to determine corrective actions of a nuclear steam generator, having the steps of modeling of steam generator tube and deposit heat transfer characteristics by analytically deriving specific deposit characteristics and descriptive model parameters, wherein the modeling uses historical thermodynamic data for an operating plant under evaluation, identifying a set of one of preventive and corrective maintenance alternatives to accomplish steam generator deposit objectives, determining through the modeling a power production impact of each of the set of one of preventative and corrective maintenance alternatives to determine an economic cost for each of the set of preventative and corrective maintenance alternatives, and initiating a maintenance alternative with a lowest economic cost as compared to the maintenance evaluation alternatives with higher economic costs.

The invention relates to a CCTV image monitoring system for an ultra-high voltage direct current converter station, and solves the problem of poor observation effect caused by the installation height and angle of a camera head relative to a disconnecting link and a contact terminal of an earthing knife. The monitoring system comprises a monitor background and the camera head, wherein the monitor background and the camera head are in communication connection through an optical transceiver; the camera head is a infrared adjustable pick-up camera with a holder; a wiper is arranged on a spherical cover of the holder; the infrared adjustable pick-up camera is fixed at the top of a remotely-controlled lifter; the lifter is connected with a driving device; a remotely-controlled infrared lamp is further arranged at the top of the lifter; and the holder, the driving device and the remotely-controlled infrared lamp are correspondingly electrically connected with a power supply respectively, and are correspondingly in communication connection with the monitor background respectively. According to the system, the height and the angle of the observation camera head can be adjusted at any time as required in observation; when dirt accumulation of the camera head is serious, dirt cleaning up of the camera head can be carried out at any time; and when the camera head failures to work, the lifter is descended to a safe height to perform corrective maintenance on the camera head without the constraint of a device being charged in a direct current field.

The invention relates to suspended mechanical spring in railway carriages for passenger, concrete relates to option processes for suspended mechanical spring in railway carriages for passenger. The invention solves the problem of difficulty in Making sure that carriages for passenger primary pass the test because of lacking of option processes for standard axle box mechanical spring and bolster mechanical spring when carriages for passenger in maintenance. Weighting the body of the carriages for passenger, Gauging partition of load of the four supporting place in the body carriages for passenger, and Ascertaining the heavy end the light end and the heavy side, the light side of the heavy end and the light end according to the partition of load of the four supporting place; gauging the free height and hardness of the vehicle-mounted axle box mechanical spring and bolster mechanical spring, Ordering the axle box mechanical spring and bolster mechanical spring in order of large to small of the product of the free height and the hardness of the mechanical springs; and then optioning in the order of heavy end to light end, heavy side to light side. The invention can reduce the workload of corrective maintenance, improve the success rate of maintenance, essentially make >primary pass the test, and improve maintenance efficiency and quality.

The invention relates to an improved soaking type vertical pump structure which comprises a positive pressure exhaust shaft seal device, a pumping connection group, an outlet pipe fixing group and the like, wherein the positive pressure exhaust shaft seal device is installed in a support tube accommodating chamber and on the upper end of an axle center and can be used for isolating and reducing the crystallization generated through the liquid vapour molecule depositing and the surface cover ratio, prolonging the time history of the periodic corrective maintenance is prolonged and reducing the times of replacing shaft seal parts; and the pump connection group is installed above the support tube and used for connecting with a support plate, and can be rapidly dismounted so as to increase the convenience of the maintenance service, and the outlet pipe fixing group is also used for improving the removable convenience of a pump during maintenance. The improved soaking type vertical pump structure provided by the invention has the advantages of reducing the crystallization generation ratio and the damage to a motor axis shaft seal, preventing the corrosive vapor from entering into the motor to further lead breakdown, providing a convenient dismounting structure and improving the manpower burden of cleaning crystals at regular intervals.

A system and method for supplying a corrective maintenance plan for a system includes supplying diagnostic data to a processor. The diagnostic data are representative of a set of two or more potential independent faults within the system, and each of the potential independent faults in the set has a unique corrective maintenance plan associated therewith. The diagnostic data are processed, in the processor, to select only one of the corrective maintenance plans. Maintenance plan data representative of the selected corrective maintenance plan are generated in the processor. For identical sets of two or more potential independent faults, the selected maintenance plan is not always the same.

The invention discloses a detection method for inducing overvoltage and overcurrent in cable core corrective maintenance. The method comprises the steps of determining relevant parameters of cables and equivalent circuits of cable lumped parameters; determining the grounding mode of detected cables and measuring actual voltage and current of normally running cables; judging the laying mode of maintained cables and treatment all the laid segmented maintained cables; selecting the mutual inductance calculation formula according to the grounding mode of the detected cables and calculating mutual inductance; calculating the induced voltage and the induced current generated by the normally running cables to the maintained cables in the longitudinal direction of the cables according to the mutual inductance by utilizing the calculation formulas of the induced voltage and the induced current; superposing the induced voltage generated by the normally running cables to the detected cables in the longitudinal direction of the cables and obtaining the superposed result to serve as the induced voltage of the detected cables in the longitudinal direction; judging whether the induced voltage is the overvoltage or not, giving relevant maintenance advice to maintainers and preventing the generated induced overvoltage from possibly injuring bodies of the maintainers.