摘要:
A probability in which a stress amplitude σp of an operating stress exceeds a stress amplitude σw of a fatigue strength (a fatigue strength excess probability pV0 of a virtual cell) at each virtual cell in which a region of a machine component is equally divided so that one inclusion is contained therein and having a virtual unit volume V0 is derived on an assumption that a distribution function of an inclusion size √{square root over ( )}area follows a generalized Pareto distribution. Then a probability in which the stress amplitude σp of the operating stress exceeds the stress amplitude σw of the fatigue strength (a fatigue strength excess probability pfV of the machine component) in at least one virtual cell is derived from the fatigue strength excess probability pV0.
摘要:
Systems, methods and devices for evaluating a condition of a downhole component of a drillstring. Methods include estimating a value of a tool parameter of the component at at least one selected position on the drillstring; and using the estimated value to evaluate the condition of the downhole component. The estimating is done using a trained artificial neural network that receives information from at least one sensor that is positionally offset from the selected position. The method may further include creating a record representing information from estimated values of the tool parameter at the at least one selected position over time. The at least one selected position may include a plurality of positions, such as positions at intervals along the component, including substantially continuously along the component.
摘要:
Monitoring the condition of an anti-vibration mount, e.g. a sandwich mount in which a plurality of elastomeric layers are interleaved with rigid plates. A set of effectiveness data is determined using input and output data measured or derived over a period of time. The effectiveness data is indicative of the effectiveness of the anti-vibration mount, in particular is dynamic stiffness. The input data is indicative of the amplitude of input vibrations that are applied to the anti-vibration mount and the output data is indicative of the amplitude of corresponding output vibrations of the anti-vibration mount (e.g. the vibrations that are transferred into an external support frame of the associated apparatus or equipment). The operating condition of the anti-vibration mount is monitored using the set of effectiveness data, e.g. by comparing successive sets of effectiveness data determined using input and output data collected over different time periods.
摘要:
Systems and methods are described for performing, verifying, and managing testing of backflow preventers. A method can include aspects directed toward confirming proper performance of tests on a backflow preventer by interrogating an inspector's location and credentials before producing test results. Systems are described to perform aspects of such methods. Further, a mobile device is provided for use by an inspector, the mobile device being directed toward confirming proper performance of tests on a backflow preventer. Aspects can also relate to the management of data related to the tests and backflow preventers.
摘要:
Various methods and systems are provided for a turbocharger. In one example, a method includes receiving a signal indicative of a monitored pressure of a pressurized oil supply of a turbocharger or other turbomachine. The method further includes determining whether a high frequency component of the signal meets one or more designated criteria, and, if the high frequency component of the pressure meets the one or more designated criteria, generating a first control signal.
摘要:
A method implemented using a processor based device includes obtaining a measured electrical signal from an electrical device coupled to a mechanical device and generating a signal signature representative of a fault in the mechanical device based on the measured electrical signal. The method also includes determining a diagnostic parameter based on a harmonic frequency of the signal signature and determining the fault in the mechanical device based on the diagnostic parameter.
摘要:
Control feedback for regulating strain output of a shape memory alloy (SMA) actuator using a stress sensor for outputting an indication of a mechanical resistance applied against the SMA actuator, and a state sensor for outputting an indication of a state of actuation of the SMA actuator has been found to be surprisingly accurate. Advantageously feedback detection can be provided with sensors that have low power requirements and can be controlled with simple electronics.
摘要:
An apparatus and system for sensing vibration in rotary or reciprocating machinery, such as motors, pumps, fans, gearboxes, compressors, turbo-machinery or high-speed spindles, which comprises a mechanical isolation member (14) interposed between a sensor base (15) and a main sensor body (11). In one aspect, the mechanical isolation member comprises a coaxial cylinder of plastic, rubber or polyurethane which is compressed between the sensor base and main sensor body.
摘要:
An inspection vehicle structured to inspect a portion of the turbine disk, preferably the blade attachment hubs, while the turbine disk is disposed within a turbine housing assembly is provided. A turbine disk is generally planar but includes a inner hub and an outer blade attachment hub. The inner hub is coupled to a shaft and the blade attachment hub provides a surface to which removable blades are attached. The area between the inner hub and outer blade attachment hub is substantially planar. The inner and blade attachment hubs are the “inspection areas” that the inspection vehicle is structured to inspect. The inspection vehicle travels over, and is magnetically coupled to the planar surface between the two hubs.
摘要:
In at least some implementations, a method for monitoring a fluid injection system that has a fluid pump activated by a coil and a controller adapted to drive the coil with a driving voltage includes monitoring the evolution of current flowing through the coil and the evolution of the time derivative of said current, and monitoring two successive zero crossings of the time derivative of the current flowing through the coil. The method provides an easy and cost-efficient way to discriminate various operating states of a fluid injection system including a coil/solenoid driven pump.