119 results about "Partial failure" patented technology

Disclosed is a system and method for caching data. A processor receives data from a host to modify a track in a first storage device. The processor stores a copy of the modified data in a cache and indicates in a second storage device the tracks for which there is modified data in cache. During data recovery operations, the processor processes the second storage device and data therein to determine the tracks for which there was modified data in cache. The processor then marks the determined tracks as failed to prevent data at the determined tracks in the first storage device from being returned in response to a read request until the failure is resolved. In further embodiments, in response to detecting a partial failure within the storage system, the processor would scan the cache to determine tracks for which there is modified data stored in the cache. The processor then stores in the second storage device information indicating the tracks having modified data in cache and schedules the destaging of the modified data from the cache to the first storage device. The processor is further capable of receiving and processing read / write requests directed to the first storage device before all the modified data is destaged from cache.

Various embodiments of the present invention provide systems and methods for data storage. As an example, storage devices are disclosed that include a plurality of memory blocks, an unreliable block identification circuit, and a partial failure indication circuit. Each of the plurality of memory blocks includes a plurality of memory cells that decrease in reliability over time as they are accessed. The unreliable block identification circuit is operable to determine that one or more of the plurality of memory blocks is unreliable, and the partial failure indication circuit is operable to disallow write access to the plurality of memory blocks upon determination that an insufficient number of the plurality of memory blocks remain reliable.

A method and system managing radio frequency identification (RFID) systems. The system monitors the performance of systems that use RFID tags and readers. It operates at multiple levels to ensure the optimal performance of readers, tags, antennae, and the information processing systems that acquire and convey tag data. The management system may employ artificial intelligence techniques such as genetic algorithms, fuzzy logic, neural networks, Bayesian networks, support vector machines or statistical methods to develop, maintain and exploit models of RFID system behavior. By comparing the actual performance of RFIDs and related components, the management system can detect and report failures and partial failures of components. The management system may also send signals to components to enhance performance of the overall RFID system.

In the case of detection of failure on a direct link interconnecting Master and Backup upstream switches, a control module of the Master upstream switch sends a partial failure message representing the occurrence of partial failure in the Master upstream switch via any of multiple lines connected to multiple ports of the Master upstream switch to the Backup upstream switch. Upon reception of the partial failure message from the Master upstream switch, a control module of the Backup upstream switch identifies partial failure occurring in the Master upstream switch and keeps the Backup operating status of the Backup upstream switch. Upon no reception of the partial failure message from the Master upstream switch, on the other hand, the control module of the Backup upstream switch identifies total failure occurring in the Master upstream switch and switches over the operating status of the Backup upstream switch from Backup to Master. In the event of failure occurring in the Master upstream switch, this arrangement effectively prevents unintentional interruption of data communication but ensures normal data communication in a network without causing the double-master state and the control loop in the network.

A method and a device for redundantly supplying several electric servomotors or drive motors by a common power electronics unit, particularly in an aircraft, wherein the power electronics unit contains a number of electronic motor control units, and wherein the electric motors are operated with nominal power if the electronic motor control units are fully functional. The motors are operated with the available residual power of the motor control units if partial failure of the motor control units occurs. The motors may be operated sequentially or simultaneously.

The invention relates to a method for electronically charging tolls, whereby actual position coordinates (OKO) of a vehicle are determined by means of at least one position fixing system, in order to determine if a toll road segment has been taken. Said position coordinates (OKO) are determined at least temporarily by means of a satellite-aided position fixing system (SGS). At least one signature (SIG), which is characteristic of the road segment taken by said vehicle, is calculated by means of said position coordinates of the vehicle (FA1, FA2). Said signature (SIG) permits the determination of whether the road segment taken is a toll road segment or not. At least in case of partial failure of said satellite-aided position fixing system (SGS), the position coordinates are determined by means of an inertial navigation system (TNS).

The invention relates to a four-rotor unmanned aerial vehicle tolerant control method, and provides a tolerant controller. When an actuator is partially failed, a four-rotor unmanned aerial vehicle is still stable. According to the technical scheme provided by the invention, a tolerant control method for partial failure of the four-rotor unmanned aerial vehicle actuator comprises the steps that the principle of the action of the actuator on the four-rotor unmanned aerial vehicle is analyzed; an unknown diagonal matrix is used to represent the influence of the failed actuator on the dynamics characteristic; by taking into account the disturbance of external unknown disturbance torque, a nonlinear dynamics model of the partially failed four-rotor unmanned aerial vehicle actuator is acquired; and an analysis method based on Lyapunov is used to prove that the whole closed-loop system shown by a formula (12) is asymptotically stable, namely when time tends to be infinite, an attitude angle eta tends to a target attitude angle eta d. The method provided by the invention is mainly used for four-rotor unmanned aerial vehicle tolerant control.

The invention discloses a tracking fault-tolerant control method for a linear multi-agent system based on sliding mode control. A fault-tolerant control method based on the sliding mode control methodand adaptive control is proposed for the actuator fault of the linear multi-agent tracking system with external disturbance. Aiming at the actuator partial failure fault that may occur in the agent,the state error variable is defined according to the communication topology between multi-agents, the integral sliding mode surface is designed based on the error variable and sufficient conditions for sliding mode asymptotic stability are given. Then the unknown upper bound of the actuator fault is estimated by the adaptive method, and a sliding mode fault-tolerant controller is proposed to guarantee the tracking stability of the multi-agent system. The integral sliding mode surface is designed according to the state error variable between the multi-agents and the robustness of the system isenhanced, and the fault-tolerant control law having good fault-tolerant ability when the system has partial actuator failure fault and external disturbance is put forward and the tracking stability ofthe multi-agent system is improved. The fault-tolerant control method is used for fault tolerant control of the linear multi-agent system with the actuator failure fault and the external disturbance.

A spacecraft posture fault tolerance control method of single gimbal control moment gyroscope groups includes the following steps that firstly, a kinetic equation and a kinematical equation are established when partial failures exist in the single gimbal control moment gyroscope groups (SGCMGs), wherein a coordinate system is defined, and a control system state equation is established; secondly, on the basis of in-orbit operation characteristics of a spacecraft, the spacecraft posture fault tolerance control method of the single gimbal control moment gyroscope groups is adopted; thirdly, the sliding mode control law is designed, wherein a sliding mode face is designed, the control law is primarily designed and the control law is improved. The method has the advantages that the designed control law is also applicable to fault tolerance control of aircrafts with flywheels as execution mechanisms; people do not need to learn about prior information of faults, real-time estimation of fault information and interference information is achieved through self-adaptation control, and fault time varying is allowed; the method is applicable to SGCMGs of any structure or partial failure modes of flywheels; the method is used in aircrafts of the SGCMGs, the rotation speed of a gyroscope frame serves as direct control amount, and the method conforms to engineering practice.

Example embodiments presented herein are directed towards improved handling during Serving Gateway (SGW) partial failures. Some of the example embodiments are directed towards a Mobility Management Entity (MME) configured to alter a S4 Serving General Packet Radio Service Support Node (S4-SGSN) that a SGW partial failure has occurred. Some of the example embodiments are directed towards a Packet Data Network Gateway (PGW) being informed that ISR for a user equipment is activated, this the PGW will save any MME related identification information for a user equipment undergoing a mobility procedure when ISR is activated.

The invention discloses a control surface fault adaptive fault-tolerant control method for a flying-wing layout aircraft, and the method comprises the steps: designing a control surface fault parameter adaptive adjustment law so as to compensate for impact on the control performance from a fault; approaching to unknown items for system uncertainty caused by the pneumatic parameter changes caused by the fault through a neural network, thereby compensating for the impact on the control performance from the pneumatic parameter changes; combining the characteristics of the flying-wing layout aircraft with the fault condition to design a dynamic control distribution strategy; carrying out the processing of an expected control signal through a command filer, and obtaining a corresponding control command with the limited amplitude, rate and bandwidth. According to the invention, the method gives consideration to the combined faults of partial failure and dead clamping of a plurality of control surfaces and the changes, caused by the fault of the pneumatic parameters of the aircraft. When the control surface of the flying-wing layout aircraft with the limited input has a fault, the method can enable the aircraft to remain stable, and to achieve the progressive tracking of a given reference signal. Moreover, the aircraft has the predetermined dynamic performances.

The invention provides a data recovery method, which comprises: determining the first Chunk whose failure has happened on a disk of the storage device; setting the space attribute of the first Chunk as inaccessible state; searching an idle second Chunk in the storage space of the storage equipment, wherein, the space attribute of the second Chunk is not set as inaccessible state; recovering data stored in the first Chunk; writing the recovered data into the second Chunk. When partial failure happens in the storage equipment, the reliability of data is guaranteed.

A system to improve memory reliability in computer systems that may include memory chips, and may rely on a error control encoder to send codeword symbols for storage in each of the memory chips. At least two symbols from a codeword are assigned to each memory chip and therefore failure of any of the memory chips could affect two symbols or more. The system may also include a table to record failures and partial failures of the codeword symbols for each of the memory chips so the error control encoder can correct subsequent partial failures based upon the previous partial failures. The error control coder is capable of correcting and / or detecting more errors if only a fraction of a chip is noted in the table as having a failure as opposed to a full chip noted as having a failure.

The invention discloses a deep foundation pit combination supporting construction method for geology with high water level and large particle size sand gravel. High pressure jet grouting pile construction is conducted outside a foundation ditch retaining and protecting system, by means of a triple placing method, cement paste is injected into underground soil filling layer and sand gravel gaps, after solidifying, secant pile wall and retention wall are formed, the underground water is prevented outside the periphery the foundation ditch retaining and protecting system, and conditions are created for the construction of a support pile; when the strength of outer side jet grouting pile meets design requirements, a long auger drilling cast-in place pile begin to be constructed close to the inner side of the jet grouting pile; after perfusion pile beings maintained for 15 days, jet grouting pile construction begins to conduct to make up partial failure of waterproof curtain of the jet grouting pile in construction of retaining and protecting pile, and retaining and protecting strength and water interception effect of the retaining and protecting system are increased; at last, in an earth excavation process, bar-mat reinforcement sprayed concrete slope protection and construction of dewatering well, open trench and water-collecting well in the foundation ditch are completed well, multiple retaining and protecting forms are used for combining construction and interaction. Accordingly, the problems of retaining and protecting the geology with high water level and large particle size sand gravel and processing the geology are solved.

The invention discloses a fault tolerant control method for a multi-agent system based on adaptive sliding mode control. The failure of the actuator in the second-order nonlinear multi-agent system isconsidered, combined with adaptive control and sliding mode control, a fault-tolerant control method is proposed. The consistency error variable is defined according to the relative state informationbetween the agents, and the sliding mode surface is designed based on the consistency error variable, and the sufficient conditions for the asymptotic stability are given. The method based on adaptive boundary estimation estimates the upper bound of the fault, which ultimately constitutes a complete sliding mode fault-tolerant controller. The method simplifies the complexity of the problem by designing a sliding surface based on the consistency error variable; combined with the advantages of adaptive control and sliding mode control, the designed fault-tolerant control law has good fault tolerance. The method is used for fault tolerant control of a multi-agent system with actuator partial failure.

The invention relates to a vibration response simulation analyzing method for a rolling bearing with single-point failures. On the basis of a Hertz contact theory, related knowledge about kinematics and kinetics are utilized to establish a five-degree-of-freedom nonlinear vibration mode of a rolling bearing and kinetic differential equations of the rolling bearing while influencing factors like slipping of rolling balls, oil slick rigidity and the like are taken into consideration, according to that the rolling balls change due to contact deformation is caused when the rolling balls roll through partial failures, a partial failure model of the rolling bearing is introduced into the kinetic differential equations of the rolling bearing, and the single-point failures of the rolling bearing are classified according to length-width ratios of the failures and size ratios between the failures and the rolling balls so as to establish different failure shape functions; the differential equations are solved by an ode solver in MATLAB (matrix laboratory) software, and vibration responses of the rolling bearing are simulated when an inner ring, an outer ring and the rolling balls of the rolling bearing are suffered from the single-point failures. By the aid of the vibration response simulation analyzing method, vibration responses of the bearings with failures in different sizes can be simulated. Compared with traditional methods for acquiring vibration responses of failed bearings, the vibration response simulation analyzing method has the advantages that an experimental period is short and experimental cost is saved. The computation for the vibration responses for the failed rolling bearings can lay the foundation of late failure diagnosis for the rolling bearings.

A power converter that can continue to operate after suffering a partial failure. The power converter includes multiple array transformers; normally-on switches connected respectively in series with the ends of each of the primary windings of the array transformers; normally-off current bypass devices connected in parallel with the series connections of the primary windings of the array transformers and the switches at the transformer ends; AC-DC converter units having AC sides respectively connected secondary windings of the array transformers; and mutually independent DC circuits respectively connected to DC sides of the AC-DC converter units. By turning on the current bypass device of the primary winding of a specified array transformer and turning off the switches at the ends of that primary winding it is possible to isolate the specified array transformer and the AC-DC converter unit connected to it.

A method and computerized system for reducing risk actually assumed by at least one of a plurality of parties, wherein at least one of the parties supplies electric power to at least one other of the parties, and if an unplanned at least partial failure to supply the electric power occurs, at least one of the parties assumes the risk. The method includes designating at least one factor associated with the supplying of electric power and for determining whether an unplanned at least partial failure to supply the electric power that occurs is a qualifying event; designating a compensation which will at least partially reduce the risk actually assumed by the at least one of the parties assuming the risk if the unplanned at least partial failure to supply the electric power occurs and is determined to be a qualifying event; and, establishing a relationship between the at least one of the parties assuming the risk and at least one other party. The at least one other party agrees to provide the compensation to the at least one of the parties assuming the risk if the unplanned at least partial failure to supply the electric power occurs and is determined to be a qualifying event.

The invention discloses a reentry attitude fault-tolerant control method for a hypersonic aircraft. The method comprises: firstly, designing a controller by adopting a Backstepping method to obtain a desired control torque; then, allocating the desired control torque to an execution mechanism in view of a partial failure fault and a clamping fault on a control surface, wherein the pneumatic control surface is used as a first execution mechanism, and an RCS (Radar Cross Section) is used as a second execution mechanism; and when the control torque provided by the pneumatic control surface is insufficient, starting the RCS. By designing the fault-tolerant control strategy, a closed-loop system is stable, and is verified in simulation.

Storage elements are read multiple times and the results are accumulated and averaged for each storage element to reduce the effects of noise or other transients in the storage elements and associated circuits that may adversely affect the quality of the read. Several techniques may be employed, including: A full read and transfer of the data from the storage device to the controller device for each iteration, with averaging performed by the controller; a full read of the data for each iteration, with the averaging performed by the storage device, and no transfer to the controller until the final results are obtained; one full read followed by a number of faster re-reads exploiting the already established state information to avoid a full read, followed by an intelligent algorithm to guide the state at which the storage element is sensed. These techniques may be used as the normal mode of operation, or invoked upon exception condition, depending on the system characteristics. A similar form of signal averaging may be employed during the verify phase of programming. An embodiment of this technique would use a peak-detection scheme. In this scenario, several verify checks are performed at the state prior to deciding if the storage element has reached the target state. If some predetermined portion of the verifies fail, the storage element receives additional programming. These techniques allow the system to store more states per storage element in the presence of various sources of noise.

The invention provides a reinforcing construction method in partial failure repairing of a rural cement pavement. The reinforcing construction method comprises the following steps: excavating an old concrete pavement needing to be repaired to the top surface of a roadbed and cleaning; cutting the excavated old concrete pavement and thus cutting the pavement into an inclined plane along the thickness direction of the road surface; respectively paving one layer of steel wire net on each of the bottom and the middle pat of the inclined section; paving thread steel bars and extending to a road surface region needing to be newly poured; pouring concrete into an excavated region of the old road surface to form a new concrete road surface. The invention aims to solve the road surface crushing problem in old cement road surface diseases of rural highways and useful resources including steel wires, steel bars and the like which are usual in villages can be effectively utilized; the engineering cost is saved and a repairing technology is simple, so as to provide a simple, economical and effective method for repairing the road surfaces of rural roads.

Methods and apparatus are provided for active motion damping of a spacecraft whose attitude control system (SACS) has experienced a partial failure. In a preferred embodiment, the apparatus comprises, an attitude control processor (ACP), a motion damping controller (MDC) coupled to the ACP, a control moment gyro (CMG) comprising a gimbal loop controller (GLC) coupled to the MDC and a gimbal motor with input coupled to the GLC and gyroscopic torque output coupled to the satellite. Normally, a gimbal rate command (GRC) from the ACP passes to the GLC for execution to rotate the CMG gimbal and the coupled satellite. If the ACP output becomes invalid, the MDC assumes control and can modify CMG operation in several ways to safely decelerate a moving satellite without hazardous mechanical stress. Following such active motion damping, the CMG remains quiescent until a RESET is received whereby further valid GRCs are then executable.

The invention discloses a reusable vehicle reentry section robust fault-tolerant guidance system and a working method, relates to the technical field of aerospace, can avoid the problems of partial failure, saturation and uncertainty of an actuator control surface in a reusable vehicle reentry gliding process, and has good robust fault-tolerant performance and control precision. According to the system and method, a nonlinear disturbance observer of an attitude angle loop and an angular rate loop and an improved prediction correction guidance law are adopted, the observer is based on the principle of a fast arc tangent tracking differentiator, and the prediction correction guidance law introduces a gain compensation term into a quasi-balanced gliding condition. Besides, an anti-saturationauxiliary structure suitable for a multiple-input-multiple-output system is adopted, variables in the auxiliary structure are introduced into a backstepping method to design a robust fault-tolerant control strategy, and finally closed-loop stability of the system is guaranteed through a Lyapunov method.

An automatic braking system of a vehicle includes an auxiliary braking device at at least two wheels of the vehicle. A controller is operable to control the auxiliary braking devices responsive to an input from a brake fluid pressure sensor and an input from a brake pedal position sensor. Responsive to the inputs being indicative of a brake pedal of the vehicle being applied and a brake fluid pressure of brake fluid of a hydraulic brake system of the vehicle being below a threshold level for the degree of application of the brake pedal, the controller determines that there is at least a partial failure of the hydraulic brake system of the vehicle and controls the auxiliary braking devices to slow down the vehicle.

The invention discloses a topological structure generating method for a distributed storage system. The topological structure generating method for a distributed storage system includes the steps: acquiring topological information in a topology update message by a main node; determining whether the topological information is the existing topology information; and if not, updating a topological list according to the topological information. Therefore, as a child node sends an LLDP (Link Layer Discovery Protocol) broadcast message carrying the topological information to the main node, the topological structure generating method for a distributed storage system can realize that an underlying protocol of topology discovery can be changed into a link layer protocol from TCP / IP (Transmission Control Protocol / Internet Protocol), thus expanding the application scene, and being able to acquire the latest topological structure in the local area network on the premise of guaranteeing partial failure or initialization scenes. Besides, the topological structure generating method for a distributed storage system optimizes the process of topology discovery without the demand for asking a customerto perform any operations, and can realize complete topology of the local area network and improve the user experience as the child node sends the LLDP broadcast message to the local area network actively. The invention also discloses a topological structure generating device and system for a distributed storage system, being able to implement the above technical effect.

In the event of a failure of one of the image storing devices provided to process colors separately, the image data allocated for the failed image storing device is sent to the image storing devices being allocated other colors and is stored therein. In the event of a partial failure of the a magnetic disk apparatus, the number of scanning lines per unit time during the document reading operation by the image reading section is reduced from the normal level or the page spacing during the reading operation by the image reading section is increased over the normal level. This arrangement ensures apparatus functions and provides a color image forming apparatus capable of continuous operations.