49 results about "Transient failure" patented technology

A method is disclosed for recovering data from a RAID system after a transient failure. After a transient failure, the cause of the failure is corrected and a user initiates a trust array command. The RAID controller receives the trust array command and performs several modifications to the disk metadata. First, the partition age metadata field is synchronized. Second, the primary dead partition map metadata field is cleared. Third, the partition status metadata field is set to initialized. Following the metadata modifications, the RAID controller verifies that it can access all of the drives in the array. If all drives are accessible, the array is on-line and fault tolerant without the need for re-constructing a drive within the array, or re-creating the array. If one drive remains inaccessible, data is available from the array, and the array is in a critical state. If two or more drives remain inaccessible, the array remains off-line and a partial recovery may be attempted. The trust array command may, in certain instances, be initiated automatically by the RAID system without any user involvement.

New and improved methods and circuit designs for asynchronous circuits that are tolerant to transient faults, for example of the type introduced through radiation or, more broadly, single—event effects. SEE-tolerant configurations are shown and described for combinational logic circuits, state-holding logic circuits and SRAM memory circuits.

The invention discloses a double clutch transmission gear pre-engagement control method. The double clutch transmission gear pre-engagement control method comprises the following steps: in a non-pre-engagement state, identifying the current gear position of a vehicle, and determining the current gear input shaft and the non-current gear input shaft according to the current gear position; controlling all gear shifting forks of the non-current gear input shaft to be in the neutral gear position; and when judging that the vehicle meets the preset gear shifting condition according to running parameters of the vehicle, controlling the non-current gear clutch to be disengaged, and engaging the target gear, corresponding to the running parameters, on the non-current gear input shaft, wherein the running parameters of the vehicle comprise the current vehicle speed. The invention further provides a double clutch transmission gear pre-engagement control system as well as the vehicle. According to the double clutch transmission gear pre-engagement control method and system as well as the vehicle, the prejudgment and pre-engagement accuracy and efficiency are improved, and the problems that the clutch is ablated or a gear component has a transient failure due to long-time simultaneous engagement of an odd-numbered gear and an even-numbered gear during the non-gear shifting process of the transmission are avoided.

The invention relates to a method for automatically judging and controlling power distribution network failure in ring main unit power supply. According to the method, when failure occurs on a main line between a switch room 2 and a switch room 3, incoming and outgoing breakers MB1, MB3, MB4 and MB6 detect the failure, branch line load switches MB2 and MB5 do not detect the failure, the outgoing breakers MB3 and MB6 trip out proactively to isolate the failure outside, the switch room 3 only detects loss of voltage, and tripping of an incoming breaker MB7 is delayed; the outgoing breakers MB3 and MB6 detect voltage sequentially, and switching-on of the outgoing breakers MB3 and MB6 is delayed; when the line failure is transient failure, switching-on of the incoming breaker MB7 is delayed under voltage later, line connection succeeds, and power supply is recovered for the whole line; when the line failure is permanent failure, the outgoing breaker MB6 is closed to the failure and trips out quickly to isolate the failure; the outgoing breaker MB3 is not closed to the failure and trips out in a locked mode; the incoming breaker MB7 detects residual voltage and is switched on in a locked mode.

The invention provides an aircraft engine transient state fault detecting method which includes first extracting marked features from rotating speed data of an aircraft engine based on a Mahalanobis adaptive Hessian locally linear embedding feature extractor; then utilizing an adaptive BP neural network classifier to analyze and determine whether faults are generated in the transient state according to the result of the feature extraction; finally processing the detected faults through a diagnosis system to generate a maintenance guide. The method solves the problem that the existing aircraft fault detection is only confined to engine data collection in the steady state. The method adopts combination of the Hessian locally linear embedding (Mahalanobis adaptive Hessian locally linear embedding) and adaptive BP (Back Propagation) neural network. The method can effectively improve the fault detection performance of the aircraft engine in the transient state.

Systems and methods for rapid Byzantine-fault-tolerant self-stabilizing clock synchronization are provided. The systems and methods are based on a protocol comprising a state machine and a set of monitors that execute once every local oscillator tick. The protocol is independent of specific application specific requirements. The faults are assumed to be arbitrary and/or malicious. All timing measures of variables are based on the node's local clock and thus no central clock or externally generated pulse is used. Instances of the protocol are shown to tolerate bursts of transient failures and deterministically converge with a linear convergence time with respect to the synchronization period as predicted.

The invention aims at providing a method for detecting transient faults of a fire pump in a quick starting process. The detected object mainly comprises the fire pump, pipelines, a fire water tank, and the like. The method comprises the following steps: controlling the fire pump to start in a condition of different accelerated speeds and pipeline resistances; synchronously collecting signals, such as vibration, temperature, rotating speed, inlet and outlet pressure, and pipeline flow, of the pump by utilizing a data collecting card; transmitting the signals to a host computer in real time for treatment; calculating lift and efficiency of the pump at a transient state according to collected signals; analyzing and treating the characteristic of each physical quantity, including the peak value and the average value of each signal, in time domain during the starting process of the fire pump; performing EMD decomposition of the signals via an HHT method; performing Hilbert transformation of each IMG component obtained from decomposition to obtain characteristic parameters, such as the amplitude spectrum and the instantaneous frequency of each signal, representing operating state of the pump; and inputting the extracted characteristic parameters into a RBF neural network for fault diagnosis to reveal an transient operating state of the fire pump in the quick starting process.

The present disclosure provides methods, systems, and computer-readable media for the detection of valve faults based on transient air pressure measurements. For example, a method for fault detection may comprise actuating a shut off valve to an open position, determining a first air pressure of air in an enclosed space at a first time, determining a second air pressure of the air in the enclosed space at a second time and in response to actuation of the shut off valve to an open position, subtracting the first air pressure and the second air pressure to obtain an actual pressure difference, comparing the actual pressure difference to a predetermined pressure difference, and determining, based on the transient comparison, whether at least one of the shut off valve and a check valve is in a failed state.

The invention relates to a weak signal detection method for multi-scale noise-regulated stochastic resonance, belonging to the signal processing field. Aiming at the problem that the output of generalstochastic resonance system does not resonate at multiple frequencies at the same time, the influence mechanism of multi-scale noise reduction on stochastic resonance is studied, and a wavelet packettransform (WPT)-based method for noise-tuned stochastic resonance (NTSR) is proposed. The noise inherent in the signal is tuned into multi-scale noise by WPT, so that the noise can be tuned more carefully. The method is based on wavelet packet transform (WPT). The new method is used to overcome the limitation of the traditional parameter adjustment method, stochastic resonance detection based onWPT multi-scale noise adjustment has a good performance in rotating machinery multi-transient fault signal detection, which has a certain guiding significance and practical value. The method can further improve the output signal-to-noise ratio and achieve multi-frequency detection.

The invention discloses a turbine control valve switch simulation modeling method based on turbine-grid coupling. Currently, no complete turbine-grid side system coupling model is studied and built to simulate the work characteristics of a steam admission control system of a turbo generator unit control valve when an electrical power system has transient failures. According to the technical scheme, the method mainly comprises the steps that a turbine power signal and a synchronous motor revolving speed signal serve as feedback signals, wherein the turbine power signal is transmitted to a synchronous motor on a grid side, and the revolving signal output by the synchronous motor is used for revolving speed feedback; a turbine DEH control system model and a grid side single machine infinite bus system model are strongly coupled, and a turbine-grid coupling control valve switch simulation model for the transient failures of the electrical power system is built; according to the turbine control valve switch logic, a control logic is built. The turbine control valve switch simulation modeling method is closer to the control valve fast closing action under the practical transient failures of the electrical power system, the simulation accuracy is improved, and the effect of the control valve fast closing technology on protecting the stable operation of a unit is verified.

A rapid Byzantine self-stabilizing clock synchronization protocol that self-stabilizes from any state, tolerates bursts of transient failures, and deterministically converges within a linear convergence time with respect to the self-stabilization period. Upon self-stabilization, all good clocks proceed synchronously. The Byzantine self-stabilizing clock synchronization protocol does not rely on any assumptions about the initial state of the clocks. Furthermore, there is neither a central clock nor an externally generated pulse system. The protocol converges deterministically, is scalable, and self-stabilizes in a short amount of time. The convergence time is linear with respect to the self-stabilization period.

Transient faults in a combinational logic become a major challenge for the VLSI (very large scale integrated circuit) design. As a typical component in the combinational logic, an adder is widely applied to an arithmetic unit. The invention discloses a low-overhead transient fault automatic correction circuit for a high speed adder. According to the structure, through developing the abundant inherent hardware redundancy and time redundancy existing in the adder circuit, automatic correction on the transient faults in the high speed adder can be realized with lower overhead, thus the fault-tolerant area and performance overheads can be obviously reduced; and through combining a fault correction technology based on a C unit and the inherent hardware redundancy and time redundancy, the transient fault correction capacity of the adder can be further enhanced. The adder provided by the invention has preferably compromised area-delay overhead compared with other structures.

A system and method for formulating a sequential equivalency problem for fault (non)propagation with minimal circuit logic duplication by leveraging information about the location and nature of a fault. The system and method further apply formal checking to safety diagnoses and efficiently models simple and complex transient faults.

The invention discloses a human reliability equilibrium method for deep water riser system risk maintenance decision optimization. The method includes taking a deep water platform SCR segment as a risk maintenance decision unit; selecting the maintenance decision unit to perform risk identification; performing unit transient failure probability analysis while performing failure probability analysis of overload stress fracture under the action of extreme environmental loads, failure probability analysis of overload fatigue fracture under the action of extreme environmental loads and failure probability analysis of external corrosion on the upper segment; performing risk analysis according to unit failure consequence assessment; back-calculating unit maintenance periods; and performing groupmaintenance strategy optimization based on the human reliability equilibrium method. The beneficial effects of the method are that maintenance grouping can be carried out on the units arranged according to the maintenance periods to realize the optimization of the riser risk maintenance strategies by taking the sum of three human error probabilities and the comparison of the maximum acceptable human error probability as the judging criteria of the maintenance grouping.

An electronic device includes a memory having memory locations being subject to transient faults and permanent faults, and a fault detection circuit coupled to the memory. The fault detection circuit is configured to read the memory locations at a first time, and determine a first fault count and fault map signature including the transient and permanent faults at the first time based upon reading the plurality of memory locations, and to store the first fault count and fault map signature. The fault detection circuit is configured to read the memory locations at a second time and determine a second fault count and fault map signature including the transient and permanent faults at the second time based upon reading the memory locations, and compare the stored first fault count and fault map signature with the second fault count and fault map signature to determine a permanent fault count.

The invention discloses a high-reliability link failure tolerance module and method aiming at transient failures and intermittent failures in network-on-chip. The module and method are characterized in that a separation type ECC is adopted to detect whether data is wrong in the network in real time and define transient failures and intermittent failures; a retransmission buffer area arranged in a router is used, and retransmission is conducted through backup data in the retransmission buffer area when transient failures occur in a link to make data go wrong and can not be corrected; a backup header flit in a virtual channel is used, and when intermittent failures occur in the link to make data go wrong and can not be corrected, data packet transmission is intercepted, and rerouting or resource release is conducted by adding header flit or tail flit to interceptive data again. With low hardware cost, network reliability can be effectively improved to guarantee system performance when failures occur.

The invention discloses a real-time dynamic detection method for a parallel bus fault of a CPU security system. The target device provides two fixed address registers. wherein the fixed address 1 register data is valid through a read signal and a chip selection signal; a positive code of the parallel bus address is triggered and latched in real time; The data of the register of the fixed address 2is written into the inverse code of the parallel bus address of the target equipment, and the CPU security system dynamically judges the correctness of the data transmission process in real time by writing the data of the fixed address 2 and reading out the XOR bit sum of the value of the register and the tested address data and judging whether the value is' 1 'or not. The data transmission process refers to a parallel bus read-write function and data access of target equipment and a CPU safety system, and detection is not limited to possible random interference and device transient failure in the process. Therefore, the bus function signal chip selection, reading and writing, the address and the data line are all tested, and the test is more comprehensive.

The invention disclose a photoelectric system method for rapid space-time positioning and attitude measuring. The method comprises steps of constructing a photoelectric scanning attitude measuring system, constructing a GNSS reference positioning system, constructing a global positioning coordinate system, calculating coordinate parameters of an omnidirectional optical receiver, calculating a distance between a laser emitter and the omnidirectional optical receiver arranged around, obtaining optimal precise coordinate parameters of the omnidirectional optical receiver, constructing a coordinate matrix, obtaining a position of an object to be measured in attitude by rotating and moving the coordinate matrix evenly, and determining whether the obtained position of the object to be measured in attitude is correct. In the method, attitude is measured by using both the constructed photoelectric scanning attitude measuring system and GNSS reference positioning system, therefore, a problem that attitude measurement cannot be continued due to transient failure of the GNSS is solved, the object to be tested in attitude is guaranteed stable in rapid space-time positioning and attitude measuring, and a correctness determining module is used to determine whether the obtained position of the object to be measured in attitude is correct, so that the measurement result is guaranteed reasonable and accurate effectively.

The invention provides a nano integrated circuit reliability evaluation method under the influence of multiple transient faults, comprising the following steps: 1, establishing a circuit reliability calculation formula of the nano integrated circuit to be evaluated; 2, determining the parameter value of the zero-fault direct current component in the reliability calculation formula; 3, performing single-fault simulation on a nano integrated circuit to be evaluate to evaluate a first-order principal component in a circuit reliability calculation formula; 4, carrying out dual-fault simulation onthat nano integrated circuit to be evaluated; 5, carrying out probability statistical analysis on the data obtained from the double-fault simulation to evaluate the second-order components in the circuit reliability calculation formula.

The present invention provides a novel cable assembly transient fault detection device and method. The device comprises: a general base of a vibration device; a plurality of mounting brackets fixed on the general base of the vibration device; a plurality of signal transmission process cables; and The number of the signal transmission process cables is the same as the signal output process cables; the instantaneous on and off fault detection equipment is provided with a plurality of connectors. The invention is suitable for detecting whether the electrical connectors, components and other points connected to the cables in the random vibration stress screening of the cable components to be tested produce instantaneous disconnection faults of microsecond level or above, and can also be used for detecting electrical connectors, components, etc. Whether components and other points that are not connected to the shielding wire produce instantaneous connection faults above the microsecond level during the above dynamic process, it is convenient to timely eliminate the cable components under test with hidden faults and improve the cable fault screening ability.

The invention provides an attack detection and identification method for sensors in the presence of a transient fault. The detection of the fault caused when the intervals of the two sensors are intersected is further judged in combination with fusion intervals, a system dynamics model is considered, and the attack detection and identification performance on the sensors is improved by utilizing historical measurement. By means of the attack detection and identification method for the sensors in the presence of the transient fault, the transient fault can be separated from an attack in a systemwith the transient fault; compared with previous attack detection methods, the method has good detection and identification performance on various types of attacks, in particular on stealth attacks;this type of attacks cannot be detected by means of the previous methods, but the detection and identification rate of the method can reach 90% or above on average.