149 results about "Failure prevention" patented technology

A system and method for using continuous failure predictions for proactive failure management in distributed cluster systems includes a sampling subsystem configured to continuously monitor and collect operation states of different system components. An analysis subsystem is configured to build classification models to perform on-line failure predictions. A failure prevention subsystem is configured to take preventive actions on failing components based on failure warnings generated by the analysis subsystem.

Autonomous remaining useful life estimation equipment interacts with the operator through natural speech, voice and sound and provides active failure prevention through automatic and/or continuous remaining useful life estimation of a material under evaluation. The equipment comprises at least one computer and a material features acquisition system operable to detect a plurality of material features. The features are then evaluated according to rules that capture the multidiscipline knowledge of experts and are already inputted into the computer. The computer iterations are processed until an acceptable conclusion is made regarding the condition of the material under evaluation, thus alleviating the need for multidiscipline experts to examine and analyze all the material data manually, a very slow and expensive process. Further, the natural speech and voice interaction preferably allows the operator to operate the equipment while wearing gloves or with dirty hands as he/she will not need to constantly physically manipulate the equipment. The remaining useful life estimation capability may also be retrofitted into conventional inspection systems by extracting pertinent features through spectral frequency analysis and sensor normalization and utilizing those features in the autonomous remaining useful life estimation system.

The invention provides a method for high-voltage direct-current transmission commutation failure prevention. The method comprises the following steps that: whether commutation failure caused by alternating current-side faults occurs or not is judged; a commutation failure prevention system outputs rectangular wave commands to a control protection system; and rectangular waves are subtracted from trigger angle commands in the control protection system, and a thyristor is triggered in advance. With the method adopted, commutation failure can be prevented when grounding faults or interphase short-circuit faults occur on an alternating current system, and the reduction amplitude of direct-current voltage and power transmission can be lowered after the faults occur.

A method for determining and prolonging hardware life expectancy is provided. The method includes collecting data from a hardware component in a first computational device, creating a quantitative value representing the status of the hardware component, determining a lifetime of the hardware component, and providing an alert to the first computational device based on the determined lifetime of the hardware component. A system configured to perform the above method is also provided. A method for managing a plurality of hardware devices according to a hardware life expectancy includes accessing an application programming interface (API) to obtain status information of a hardware component in a computational device is also provided. The method includes balancing a load for a plurality of redundancy units in a redundancy system and determining a backup frequency for a plurality of backup units in a backup system.

The invention relates to a hybrid direct current transmission system which is in a bipolar structure and comprises a positive electrode converter transformer, a positive electrode converter, a negative electrode converter transformer and a negative electrode converter. In the bipolar structure, one converter is an MMC converter composed of an MMC sub-module, and the other is an LCC converter system which is composed of at least one LCC. The hybrid direct current transmission system provided by the invention has the advantages of mature LCC-HVDC technology, low cost, VSC-HVDC commutation failure prevention, flexible control and strong expansion performance.

A failure prevention diagnosis support system includes: an acquiring portion that acquires internal information about an internal state of an image forming apparatus; a storage portion that stores one or a plurality of logistic regression models that define an estimate value of a regression coefficient through a logistic regression analysis using the internal information obtained when the image forming apparatus is in a failed state and in a normal state; and a controller that performs a control operation to select a logistic regression model from the one or the plurality of the logistic regression models stored in the storage portion in accordance with the image forming apparatus, and to calculate risk degrees as objective variables that are indicators of failure degrees in the image forming apparatus by assigning the internal information acquired by the acquiring portion or the value obtained from the internal information to the selected logistic regression model.

A manufacturing method for a semiconductor light emitting device is provided. The method includes preparing a first wafer in which at least one semiconductor layer including the emitter layer is formed; disposing a second wafer transparent to an emission wavelength of the emitter layer on the surface of the first wafer; providing a bonding failure prevention structure to at least either the first wafer or the second wafer for preventing bonding failures of the first wafer and the second wafer; and applying compressive force to a contact face between the first wafer and the second wafer while at the same time, heating the contact face. The first and second wafers can be bonded across their entire surfaces without causing bonding failure.

The invention discloses a commutation failure prevention and control method for a direct-current transmission system under a grid fault. The method comprises the following steps: based on LCC-HVDC commutation failure mechanism analysis, an LCC-HVDC critical commutation voltage calculation formula under a symmetrical short circuit fault of an alternating-current power grid of a receiving end is derived by considering the influence of dynamic change of a direct current and a fault moment in a commutation process; and meanwhile, by considering the influence of a drop amplitude of an alternating-current voltage on a commutation margin, a calculation method of a trigger angle adjustment amount is provided, and further a CFPREV improvement strategy of LCC-HVDC is provided. According to the method, the problem that a starting voltage and the trigger angle adjusting amount of existing CFPREV are mainly based on engineering experience values is solved, so that the initial commutation failure immunocompetence can be improved; and the method has a great significance for safe and stable operation of the alternating-current/direct-current power grid.

A co-injected molded multi-layer article has inner and outer layers, an interior layer contained within the inner and outer layers and a surface portion to which a closure or other component may be heat-sealed. The article is molded by co-injecting the inner, outer and interior layer materials into a mold cavity of a mold. The interior layer material is caused to flow along a steam line offset from the zero velocity gradient of the combined material flow and biased toward a material flow for forming an outer wall of the multi-layer article. The resultant molded multi-layer article contains an interior layer located in a heat sealable region that avoids a breach or failure during a heat seal operation to seal an opening of the molded article.

The invention relates to a predictive commutation failure prevention method, apparatus and device. In the method, a needed angle Alpha is taken from output of a phase-locked loop and the zero crossing point and half-period time of an AC synchronous voltage no longer need to be measured. Because the commutation margin areas of 12 bridge arms are calculated at the same time, the pre-trigger valve number does not need to be considered anymore, and minimum values of the 12 areas are selected so that the effect of commutation failure prevention is better. DC shaping and a nonlinear compensation technology are used to correct post-trigger commutation voltage and DC fluctuation so as to enhance the commutation failure prevention capability.

The invention discloses an on-line monitoring system and method of an artificial intelligent high-voltage circuit breaker. The system is used for acquiring real-time data and non-real time data of a substation and monitoring technical indexes such as mechanical property, control loop characteristic and warning signal characteristic of the high-voltage circuit breaker in an on-line way, the monitoring time parameter accuracy is not larger than 1 millisecond, the accuracy conforms to a circuit breaker manufacturing parameter range, and a delay error of a control loop comprising different physical links also can be compensated by an artificial intelligent technology. The monitoring range of the system is expanded to control loop and warning signal from equipment body, and the system has the advantages of installation and debugging without power failure, no trigger on equipment and control loop, no electromagnetic interference, no addition of extra operation and maintenance workload and the like. The on-line monitoring system of the artificial intelligent high-voltage circuit breaker and power-failure prevention experiment form a power-failure artificial experiment and on-line intelligent monitoring dual-functional active early-warning guarantee system, and a decision-making reference is provided for optimization of the circuit breaker running and maintenance strategy.

Individual storage devices of a RAID group are monitored for faults. A health indicator for each storage device is calculated based on fault growth rate. Non-failed storage device are swapped out based on the health indicator. Techniques for monitoring the storage devices include background media scans and growth list polling.

The invention provides an active type automobile driving safety device which comprises a central processor module for receiving signals detected by each detection unit, calculating whether a safe driving rule is met and transmitting an instruction to function modules, and the function modules which are connected with the central processor module and are used for controlling safe driving of an automobile body or reminding a driver of safe driving, wherein the function modules comprise a clutch control module, an accelerator control module, a brake control module and a turning light control module. According to the active type automobile driving safety device, the central processor module judges the automobile safe driving rule according to data of all sensors on the automobile body to control the accelerator control module, the brake control module and the clutch control module which serve as main components, so as to realize safe driving of an automobile. Furthermore, the active type automobile driving safety device can realize an over reversing or advancing prevention function, a member failure prevention function, a fatigue driving prevention function and the like by combining the functional control modules and the sensors.

The invention relates to a detection method of a commutation failure of a direct-current power transmission system. For a converter station, a converter extinction angle gamma provided by a system is calculated, the converter extinction angle gamma provided by the system is compared with a minimum extinction angle value gamma min that is needed by the converter itself so as to determine whether a criterion of gamma being larger than gamma min is met; a maximum voltage time area Sv provided by an alternating-current line voltage and a commutation area S needed by the converter during the commutation process are calculated, and whether a criterion of Sv being larger than S is met is determined; and as long as one of the criteria is met, occurrence of a commutation failure at the system is determined. According to the invention, the extinction angles and the commutation area are used for determination and the commutation process of the multi-infeed direct-current power transmission system can be reflected simultaneously, visual, and completely from two aspects. Phenomena of voltage drop and voltage distortion can be detected accurately and thus the occurrence trend of the commutation failure can be detected, thereby providing the basis for the protection strategy of the converter. And a reference frame is also provided for commutation failure prevention measures like reactive compensation.

The invention provides a layered access direct current commutation failure prevention and control setting method and device. The method comprises the following steps: constructing an electromechanicaland electromagnetic hybrid simulation example, the example comprising acquired electromechanical side data of layered access of ultrahigh voltage direct current and a built electromagnetic side modelof the layered access of the ultrahigh voltage direct current; setting a fault, and finding out a fault form that causes a commutation failure of a converter valve on a non-faulty layer; analyzing factors affecting a turn-off angle in a commutation failure prevention and control logic, and selecting parameters suitable for the commutation failure prevention and control of a layered access system;and forming a commutation failure prevention and control strategy according to the parameters for the commutation failure prevention and control. The layered access direct current commutation failureprevention and control setting method provided by the invention adopts an electromechanical-electromagnetic hybrid simulation measure, and a direct current system is built on the electromagnetic side, so that a detailed structure of layered direct current is considered, and the defect that a traditional electromechanical model simulation method cannot accurately simulate a commutation failure process is overcome.

The invention provides a method for estimating local fatigue strength of gears according to residual stress distribution at gear roots. The method comprises the following steps of: testing residual stress distribution and bending fatigue strength of a gear under at least three shot blasting process states; obtaining a quantitative relationship coefficient between a residual stress value and bending fatigue strength according to the test result and a Goodman relationship; and designing reasonable local fatigue strength of the gear according to the quantitative relationship coefficient, and back-stepping required residual stress distribution and a reasonable shot blasting process for realizing the distribution, or predicting a bending fatigue failure mode of existing gear products so as to formulate reasonable prevention measures and improve the shot blasting strengthening process. According to the method, quantitative association between residual stress distribution at roots of gears and local bending fatigue strength is established, and a concept of local fatigue strength is innovatively put forward, so that residue stress can quantitatively enter the design stage of the gear products through being taken as mechanical parameters, and the reasonable shot blasting strengthening process is back-stepped. Meanwhile, bending fatigue failure forms of existing gears are analyzed and pre-judged, so that directions are provided for failure prevention and the shot blasting process.

The invention relates to a method and system for estimating a commutation failure prevention effect of a synchronous phase modulation machine on line-commutator-converter high voltage direct current (LCC-HVDC). The method comprises the steps of calculating an initial short-circuit ratio of an AC system at an inversion side of a DC system; maintaining the initial short-circuit ratio of the AC system at the inversion side unchanged, putting to the synchronous phase modulation machine, and performing simulation to obtain a preset fault inductance value corresponding to commutation phase failure probability of an LCC-HVDC system; removing the synchronous phase modulation machine under the corresponding preset fault inductance value, and calculating the changed short-circuit ratio of the AC system at the inversion side of the DC system; and performing calculation to obtain commutation failure probability-based short-circuit increment according to the initial short-circuit ratio and the changed short-circuit ratio. With the method provided by the technical scheme, the problem of shortage of an index measuring commutation failure prevention capability of the LCC-HVDC system and having actual engineering significance is solved.

Embodiments of the invention disclose a terminal power failure prevention method and a terminal. The method comprises the following steps of: obtaining a current value of the terminal and an output voltage value of a terminal battery in real time; and if the current value is not smaller than a preset current threshold value or the output voltage value is smaller than a preset voltage threshold value, adjusting a CPU running state of the terminal so as to control the terminal to enter an anti- power failure mode. According to the method disclosed by the embodiments of the invention, the current value of the terminal and the output voltage value of the terminal battery are obtained, the current value and the output voltage values are compared with the preset threshold values, and the CPU running state of the terminal is adjusted when the current value is smaller than the preset current threshold value or the output voltage value is smaller than the preset voltage threshold value, so as to control the terminal to enter the anti-power failure mode, so that the terminal is effectively prevented from power failure when the battery voltage is relatively low.

The invention discloses a phase change failure prevention method based on rectification side trigger angle emergency control. Occurrence of phase change failure has a unique correspondence relationship with the rectification side trigger angle and the inversion side trigger angle when the DC system primary parameter and the control system and AC system voltage are certain under the premise of reasonable assumption according to mechanism analysis of phase change, and the rectification side trigger angle and the inversion side trigger angle have no coupling relationship so that the possibility of phase change failure can be rapidly reduced by changing the rectification side trigger angle according to certain logic after the fault occurs in the AC system. The variable fault detection threshold and the variable inertial time constant are adopted, and the rectification side trigger angle is directly controlled without the PI control link so as to have the advantage of rapid response. According to the method, the possibility of phase change failure can be reduced and safe and stable operation of the AC-DC compound system can be maintained.