摘要:
A method for performing a fault estimation based on residuals of detected signals includes determining an operating regime based on a plurality of parameters, extracting predetermined noise standard deviations of the residuals corresponding to the operating regime and scaling the residuals, calculating a magnitude of a measurement vector of the scaled residuals and comparing the magnitude to a decision threshold value, extracting an average, or mean direction and a fault level mapping for each of a plurality of fault types, based on the operating regime, calculating a projection of the measurement vector onto the average direction of each of the plurality of fault types, determining a fault type based on which projection is maximum, and mapping the projection to a continuous-valued fault level using a lookup table.
摘要:
Shape of a long reach device, e.g., a welding torch, suitable for use within a portion of an object along a joint curve, e.g., a weld joint, is determined by dissecting the long reach device into a discrete number of portions, identifying ranges of movement between each of the portions, and discretizing the ranges of movement into a predetermined number of intervals. A total number of possible shapes is determined based on the total portions of the long reach device having the first movement range discretized into a predetermined number of intervals. A representation of the long reach device having one of the possible shapes is compared with the representation of the portion of the object. A possible shape is deemed acceptable if less than a predetermined portion of the representation of the long reach device interferes with the representation
摘要:
The precise three-axis attitude of a space-borne phases-array antenna is estimated based on the assumption that the array geometry, consisting of the number of radiating elements and their relative spacing in three dimensions, is known and that the array position and coarse knowledge of the array attitude are available a priori. An estimate is first made of the set of complex-valued gains that define each element's straight-through contribution to the signals received at each of two or more remote calibration sites, where a "straight-through" antenna configuration is defined as the condition in which all elements are made to radiate with the same amplitude and phase. An optimization strategy is then used to determine which array attitude lying in the neighborhood of the coarsely known attitude is most consistent with the full set of straight-through gain values. Another technique for estimating the precise angular location of a receiver with respect to the coordinates of the space-borne phased-array antenna is based on the assumptions that the array geometry is known, and that the receiver bearing is coarsely known or available. After an estimate is made of the set of complex-valued gains that define each element's straight-through contribution to a composite signal measured at the receiver site, an optimization strategy is used to determine which receiver direction lying in the neighborhood of the coarsely known direction is most consistent with the latter set of straight-through gain values.
摘要:
A detection system includes flame sources at least two of which are independently controllable; photodetectors each having an independent view of the flame sources and being capable of producing a respective current signal in response to flames produced by the flame sources; and a device for analyzing the current signals to determine state values of a plurality of state variables and transform the state values into at least one parameter value. A number of the flame sources is at least as high as a number of the state variables, and a number of the photodetectors is at least as high as the number of the state variables. In one embodiment, the flame sources include gas burners in a gas combustion chamber, the photodetectors include silicon carbide photodiodes, and the parameter value is representative of fuel rate, temperature, acoustic dynamics, nitrogen oxide concentration, or carbon monoxide concentration. The device for analyzing the current signals can include means for mapping each of the current signals with respect to the state variables and inversely mapping the current signals and the state variables to determine the dependence of each of the state variables with respect to the current signals.
摘要:
A computer-readable storage medium having stored thereon a computer program including instructions, which, when executed by a computer, cause the computer to acquire route data in a first format for a route, the route data comprising a plurality of route parameters for a plurality of route locations. The computer is further programmed to re-format the acquired route data in the first format into a second format different from the first format, filter the reformatted route data into a route dataset having a lesser number of route locations than the number of route locations in the acquired route data, and to store the route dataset in computer memory.
摘要:
The present techniques provide methods and systems for recording micro-holograms on a holographic disk using a plurality of counter-propagating light beams in parallel. The parallel counter-propagating light beams overlap to form interference patterns on a data layer and over multiple data tracks in the holographic disk. Rotating the disk enables the parallel recording of micro-holograms over multiple data tracks, thus reducing recording time. Further, the illumination pattern may include illuminated spots and non-illuminated regions, such that each illumination spot may cover a relatively small fraction of the data layer plane, possibly controlling the depth spread of the recorded micro-hologram. In some embodiments, data in the parallel signal beams may be retrieved from a master holographic disk or may be modulated into the parallel signal beams.
摘要:
The present techniques provide methods and systems for controlling the recording of micro-holograms using multiple counter-propagating light beams over multiple data tracks of a holographic disk. Imperfections in a holographic disk or movement of the disk during a recording process may cause signal beams to deviate from target data tracks. In some embodiments, a tracking beam is directed to a reference layer in the disk. Deviation of the reference beam from a target groove in the reference layer may be indicative of tracking errors. A detector may detect reflections of the tracking beam and generate an error signal in response to detected tracking errors. Servo-mechanical devices may actuate (e.g., radially, tangentially, or axially translate, rotate, and/or tilt) one or more optical components through which the counter-propagating light beams are emitted to compensate for tracking errors.
摘要:
A system for detecting a hot surface is provided. The system includes a sensor for sensing an infrared radiation radiating from the hot surface and a high pass filter to eliminate low frequency components from the sensor signal. The system also includes an absolute value module to compute absolute values of a filtered signal, a first comparator to compare output of the absolute value module to a first threshold and a peak detector to report a peak value of the sensor signal's output. The system further includes a second comparator to compare output of peak detector to a second threshold.
摘要:
A computer-readable storage medium having stored thereon a computer program including instructions, which, when executed by a computer, cause the computer to acquire route data in a first format for a route, the route data comprising a plurality of route parameters for a plurality of route locations. The computer is further programmed to re-format the acquired route data in the first format into a second format different from the first format, filter the reformatted route data into a route dataset having a lesser number of route locations than the number of route locations in the acquired route data, and to store the route dataset in computer memory.
摘要:
A vehicle location determination system and method provide an estimate of real time location of the vehicle along a route in response solely to vehicle GPS information and vehicle speed information such that the estimated real time distance is robust to errors and disturbances associated with both the vehicle GPS information and vehicle speed information to ensure the estimated real time location information is accurate.