60 results about "Derating" patented technology

Rotary-wing aircraft or fixed-wing aircraft consisting of one or a plurality of rotors and / or one or a plurality of airscrews being caused to rotate by means of at least one shaft, the said aircraft comprising a distributed electric motor unit configured to ensure the propulsion and / or the lifting of the said aircraft by causing the said shaft to rotate, the motor unit being a distributed electric motor unit connected directly to the rotating shaft, no mechanism for the transmission of movement being interposed between the said CND unit and the said shaft, the distributed electric motor unit being composed of a plurality of stacked electric motor elements, each said electric motor element being connected directly to the rotating shaft and consisting of at least one fixed stator and at least one moving rotor capable of connection to the said rotating shaft in order to transmit to it a mechanical power of the following kind where: Pr=the nominal mechanical power necessary for the propulsion and / or for the lifting of the said aircraft, Pim=the maximum mechanical power capable of being delivered by the electric motor element on level i, to the rotating shaft, for instance Pim<Pr, Ki=the power derating of the electric motor element on level i, for instance 0≦ki≦1, Ki being a variable that is adjustable as a function of the undamaged number of electric motor elements and / or as a function of the nominal mechanical power necessary for the propulsion and / or for the lifting of the said aircraft at a moment in time t, n=the number of electric motor elements comprising the distributed electric, motor unit, for instance n≧2,—the axes of rotation of the moving rotors and of the rotating shaft being coaxial.

A method and system for controlling engine temperature by derating torque output of the engine. The method and system operate in cooperation with an electronic control module which is programmable for controlling temperature in the engine by derating maximum engine torque output based on an engine temperature rate of change. This permits the derating to be finely tuned to maximize available torque.

One embodiment of the present invention provides a system that reduces timing pessimism during Static Timing Analysis (STA). During operation, the system receives parametric variation data which describes the on-chip variation of timing-related parameters. Next, the system computes region-specific derating factors using the parametric variation data. The system then identifies a set of worst-case violating paths using the region-specific derating factors. Next, the system computes path-specific derating factors for one or more paths in the set of worst-case violating paths using the parametric variation data and the path properties. Finally, the system identifies zero or more realistic-case violating paths from the set of worst-case violating paths using the path-specific derating factors.

The invention provides a dynamic prediction method for junction temperature of an IGBT power module. The method solves the problem of excessive derating and an irrational thermal design for avoiding failure caused by excessive junction temperature and excessive fluctuation of the IGBT power module. According to the running state of a motor, dynamic analysis is conducted on circuit parameters suchas modulation ratio, output current, output voltage, output frequency and the like, an analytical value is input into a junction temperature calculation model considering electrothermal coupling, anddynamic junction temperature prediction under working conditions is achieved.

The invention discloses a meteorological-factor-considered method for evaluating the photovoltaic-power-station grid-connected risk. The method includes the steps that a clustering feature vector is formed by meteorological indexes, photovoltaic historical output data is subjected to clustering analysis, and a photovoltaic-power-station output power probability model of the meteorological factorsis established; then according to an element outage model, transfer sequences of a photovoltaic power station and a common electric generator in the running, derating and outage states are extracted;an outage-model-contained photovoltaic output power sequence, an outage-model-contained common electric generator sequence and a load sequence are superposed according to time sequences, a usable margin model of a system is obtained, loads of a negative margin need to be suitably cut down, and light of a positive margin needs to be suitably discarded; the load loss risk and a power-supply loss risk index are calculated with the sequential monte carlo method. The method aims at considering the influence of strong correlation meteorological factors such as the irradiance and the temperature on the photovoltaic output power probability model, and the risk brought when the photovoltaic power station is connected into a power feeding net is thus analyzed.

The invention provides an SRAM (Short-Range Attack Missile) type FPGA (Field Programmable Gate Array) on-orbit single-particle turning protection quantitative evaluation method, which comprises the following steps of: calculating the device level single-particle turning rate of a SRAM type FPGA; adopting any one or various measures from resource derating, triplication redundancy and intermittent booting and shutdown for reducing the single-particle turning occurring probability, and further calculating the one-machine level single-particle turning rate; adopting any one or various protection methods from regular refreshing, read-back refreshing, regular reloading, read-back reloading and watchdog for reducing the influence caused by the single-particle turning and reducing the harm caused by the single-particle turning; and further obtaining the function influence degree and the task success influence degree of the one-machine level single-particle turning through calculation. The SRAM type FPGA on-orbit single-particle turning protection quantitative evaluation method solves the problem of quantitative calculation of the one-machine single-particle turning rate after the adoption of various software and hardware protection measures of an aircraft product including the SRAM type FPGA and the problem of quantitative evaluation of the one-machine task interruption influence degree and the one-machine function influence degree after the turning.

The invention provides a motor control method and device and electrical equipment, and the method comprises the following steps: obtaining a temperature parameter and a power parameter during the operation of a motor; judging whether the temperature parameter is greater than a corresponding temperature protection limit value or not, and whether the power parameter is greater than a corresponding power protection limit value or not; when the temperature parameter is greater than the corresponding temperature protection limit value and / or the power parameter is greater than the corresponding power protection limit value, adjusting a preset current limit value according to a difference value between the temperature parameter and the corresponding temperature protection limit value and / or a difference value between the power parameter and the corresponding power protection limit value to obtain a current adjustment value; and controlling the motor according to the current adjustment value.Therefore, current derating can be carried out when the temperature of the motor, the temperature of the power device and the input power of the motor or the motor driver exceed respective corresponding protection limit values, the maximum current output capability of the driver is reduced, shutdown is reduced or avoided, and user experience and safety are both considered.

Apparatus is provided for performing timing analysis on a circuit. A first storage device portion stores a state dependent stage weight for each of a rising time arc and a falling time arc of each of a plurality of cells in a cell library. An adder is provided for calculating a sum of the state dependent stage weights for each of the cells that are included in a circuit path. A second storage device portion stores a table containing on chip variation (OCV) derating factors. The table is indexed by values of the sum. A total path delay is calculated for the circuit path, based on the OCV derating factor corresponding to the sum of the state dependent stage weights for the cells in the circuit path.

A computer-implemented method for designing a voltage regulator module (VRM) is disclosed. The method includes receiving design parameters and a component data for each component and storing the design parameters and the component data for each component into a component selection table, calculating a work efficiency of the VRM, and storing the work efficiency into a power computation table. The method further includes simulating a derating of each component according to a corresponding rated stress of each component if the work efficiency is greater than or equal to a predetermined work efficiency, calculating a stress ratio of each component, and storing the stress ratio into a component derating table. The component selection table, the power computation table and the component derating table are stored to form a desired VRM model if the stress ratio of each component meets a corresponding derating specification.

Soft error modeling of circuits. Soft error upset (SEU) specification and design information is received from a design entry. The SEU specification comprises expected SEU behavior of a node. A logical simulation model is created based on the SEU specification and the design information. A logical verification is performed based on the logical simulation model to produce a first result. The logical verification comprises selecting a first node for injection, injecting an SEU into the first node to produce a first result, and responsive to the first result not agreeing with the SEU specification, providing the first result to the design entry. A netlist based on the SEU specification and the design information is created. The netlist comprises a specification-based-logic-derating derived from the SEU specification. A physical design verification based on the netlist, a logic derating, and clock information is performed. It comprises calculating node failure-in-time based on the specification-based-logic-derating.

A method for controlling a vehicle system includes determining when the vehicle system approaches an airflow restricted area and distributing a total power output of the vehicle system among first and second vehicles of the vehicle system. The total power output is distributed by directing the first vehicle to decrease power output relative to a power output generated by the second vehicle and / or by directing the second vehicle to increase power output relative to the power output generated by the first vehicle. The method includes monitoring the power output of the second vehicle during travel of the vehicle system in the airflow restricted area to determine when the second vehicle derates and redistributing the total power output of the vehicle system among the at vehicles as the vehicle system travels in the airflow restricted area and responsive to the second vehicle derating.

An electric oil pump system and a control method thereof include an electrical oil pump that is derated or the derating of the electrical oil pump is released according to a coil temperature of the electrical oil pump, and a torque of a transmission is control according to whether or not the electrical oil pump is derated.

The invention discloses a power supply circuit suitable for aerospace application. The circuit comprises a voltage input end, a 12V linear voltage stabilization block, a 5V linear voltage stabilization block, a 12V power utilization unit and a 5V power utilization unit, the circuit also comprises a power resistor, a current sampling circuit and a voltage comparator circuit, wherein the power resistor is used for limiting the current of a post-stage circuit, the current sampling circuit is used for collecting voltage at two ends of the power resistor and outputting sampling voltage after amplification, and the voltage comparator is respectively connected with the output of the current sampling circuit and preset reference voltage, compares the sampling voltage with the reference voltage andoutputs TTL level signals. According to the invention, the problem that the linear voltage regulator module does not meet the first-level derating requirement of aerospace parts is solved, the problem that the voltage regulator module is heated seriously is improved, and the problem of how to protect and detect when a single event locking effect occurs to a part of parts of a circuit is solved. And compared with a DC / DC voltage stabilizer module, the size is smaller, the weight is lighter, the cost is lower, and the space environment adaptability is better.