Abstract: A method of preventing surge in a dynamic compressor is disclosed. The method includes providing an anti-surge valve having an adjustable opening for increasing the flow through a dynamic compressor. The next step is sensing process conditions in the dynamic control to determine a compressor load variable. A control system estimates a process disturbance model using the compressor load variable. The control system then adjusts a safety margin using a rate limited response and initiates a closed loop response using process feedback based on the process disturbance model. The control system adjusts the opening of the anti-surge valve according to the safety margin and closed loop response.

Abstract: An electrical network configured to suppress voltage transients is disclosed. The network includes a capacitor and an electrical impedance in parallel with a diode. The capacitor is in series with the parallel connected diode and electrical impedance, and the electrical network is configured to suppress voltage transients occurring across the series combination of the capacitor and the parallel connected diode and electrical impedance.

Abstract: An integrated power system suitable for simultaneously powering marine propulsion and service loads. The system includes: (a) at least one generator configured with at least first and second armature windings configured to output respective first and second alternating current power signals of different voltages, the at least two armature windings positioned within the same stator slots so that they magnetically couple; (b) at least first and second rectifier circuits coupled to said generator to convert said first and second alternating current power signals into first and second direct current power signals; (c) a first load to which said first direct current power signal is coupled and a second load to which said second direct current power signal is coupled.

Abstract: A fume hood includes a ventilated chamber having an access opening. A first elongated airfoil assembly is attached to an edge portion of a floor that extends from the opening. A sash is slidably mounted at the access opening and a second elongated airfoil assembly is attached to a lower edge of the sash. The first elongated airfoil assembly includes a plurality of elongated vanes in vertically spaced-apart relationship that define air flow channels. The second airfoil assembly includes a pair of elongated vanes in vertically spaced-apart relationship that define air flow channels that extend into the chamber. A baffle assembly is located in front of a rear wall of the chamber and includes a primary panel having a plurality of vertical air-exit slots adjacent a lower edge, and a buffering panel having a plurality of horizontal air-exit slots adjacent an upper portion.

Abstract: An integrated power system suitable for simultaneously powering marine propulsion and service loads. The system includes: (a) at least one generator configured with at least first and second armature windings configured to output respective first and second alternating current power signals of different voltages, the at least two armature windings positioned within the same stator slots so that they magnetically couple; (b) at least first and second rectifier circuits coupled to said generator to convert said first and second alternating current power signals into first and second direct current power signals; and (c) a first load to which said first direct current power signal is coupled and a second load to which said second direct current power signal is coupled.

Abstract: Systems and methods disclosed herein include a controller for a current source rectifier that is configured to facilitate operation in both continuous and discontinuous conduction modes. The controller comprises a discontinuous mode detection unit configured to determine when input current of the current source rectifier becomes discontinuous and a duty cycle calculation unit adapted to calculate duty cycles for the current source rectifier differently for operation in continuous or discontinuous mode. The controller is adapted to transition to a mode of operation to provide an input current that approximates a sinusoidal current during both the continuous and discontinuous modes of operation. The controller outputs control signals to turn on one or more of the electrical switches in the current source rectifier based on the calculated duty cycles.

Abstract: A system and method of non-contact measurement of the dopant content of semiconductor material by reflecting infrared (IR) radiation off of the material and splitting the radiation into two beams, passing each beam through pass band filters of differing wavelength ranges, comparing the level of energy passed through each filter and calculating the dopant content by referencing a correlation curve made up of known wafer dopant content for that system.

Abstract: A control system for operating a device in a turbo machine system. The system includes a first programmable logic control device producing an analog output signal and a relay circuit electrically connected to the first programmable logic control device to receive the analog output signal. A field device is electrically connected to the relay circuit to receive the analog output signal to operate based on the analog output signal to provide a load. In addition, the relay circuit is electrically connected to a second programmable logic control device to communicate the analog output signal to the second programmable logic control device to monitor the analog output signal.

Abstract: A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals.

Abstract: An inverter controller comprising a current regulator unit, a voltage regulator unit coupled to the current regulator unit, an inverter unit coupled to the voltage regulator unit, and a drive unit controlled by the inverter unit.

Abstract: A system for controlling operation of an internal combustion engine includes a controller configured to send signals for controlling at least one of air-fuel ratio, spark-ignition timing, and fuel injection timing to an internal combustion engine. The system further includes a sensor configured to send a signal indicative of exhaust gas temperature to the controller. The system is configured to control at least one of the air-fuel ratio, spark-ignition timing, and fuel injection timing based on a signal indicative of at least one of an operating condition of the internal combustion engine and load on the internal combustion engine, and a difference between a target exhaust gas temperature and the signal indicative of the exhaust gas temperature.

Abstract: Embodiments of the present invention are directed to a method and system for performing non-contact based determination of the position of an implement. In one embodiment, a non-contact based measurement system is used to determine the relative position of an implement coupled with a mobile machine. The geographic position of the mobile machine is determined and the geographic position of said implement based upon the geographic position of the mobile machine and the position of the implement relative to the mobile machine.

Abstract: An apparatus for launching and recovering at least one water vehicle includes a frame supported by a base. The base may be mounted to the deck of a boat. The frame includes an elongate stand for supporting the water vehicle. The frame is mounted for being moved relative to the base between a stowed position and a deployed position, so that a rear end of the stand is at a lower elevation in the deployed position than in the stowed position. A guide is carried by the frame and adapted for being moved back and forth along the stand. The guide is for mechanically guiding the water vehicle along the stand.

Abstract: Apparatus for controlling the power output efficiency of a power generation system based on an operator input. A processor is coupled to the input means and (i) receives the generated operator command, (ii) receives a plurality of detected ambient air conditions, (iii) receives a plurality of detected engine. performance parameters, (iv) determines first and second engine control commands based on the received pilot thrust command, the detected ambient environmental conditions, and the engine performance parameters, and (v) outputs control commands to optimize the efficiency of the power generation system.

Abstract: An image-augmented inertial navigation system includes an inertial navigation system configured to estimate a navigation state vector and an imager configured to output pixel signals associated with terrain features passing through a field view of the imager. The system further includes a processing unit configured to determine a distance from the imager to each of the pixel signals for a given image frame and to determine a distance between the imager and a centroid of one or more of the terrain features passing through the field of view of the imager for the given image frame. The processing unit is also configured to track each terrain feature as the terrain features pass through the field of view of the imager. The processing unit is further configured to update the navigation state vector of the inertial navigation system based on calculated NED coordinates position information of the tracked terrain features.

Abstract: An inverter controller comprising a current regulator unit, a voltage regulator unit coupled to the current regulator unit, an inverter unit coupled to the voltage regulator unit, and a drive unit controlled by the inverter unit.

Abstract: A high voltage inverter is provided which includes a plurality of k-level flying capacitor H bridge modules, k being greater than 2, each having a positive dc terminal, a negative dc terminal, and two ac terminals, a connecting unit for connecting said ac terminals of said plurality of k-level flying capacitor H bridge modules in series to form a cascading set of modules, and a dc source connected to an ac source and having a transformer, a rectifier rectifying an output voltage of said transformer, and a capacitor connected between the positive and negative dc terminals.

Abstract: An intercepting vehicle, which is being towed by a towing vehicle, may home in on and attach to a retrievable vehicle that catches up to the intercepting vehicle from behind. Then, the intercepting vehicle, with the retrievable vehicle docked thereto, may be brought to the towing vehicle by reeling in the intercepting vehicle with the retrievable vehicle docked thereto.

Abstract: A method of correcting surge control parameters that includes providing a dynamic compressor having a compressor, driver, surge valve, and control system. The control system establishes surge control parameters such as surge detection lines, surge limit lines, and then detects the onset of a surge in the dynamic compressor. When the surge is detected the control system measures variables of the dynamic compressor such as fluid pressure, fluid speed, power, speed and valve position and based on these variables the control system automatically corrects the surge control parameters based on these variables at the time of the onset of the surge is detected. Advisory information is provided by control system to user for corrective actions to prevent surge.

Abstract: Electrically assisted safing of a solenoid linear actuator to provide shock tolerance is provided for a solenoid actuator, the actuator having an armature and at least one electromagnetic inductive coil. A controller, receiving an output from a motion sensor, adjusts an electrical power input to the electromagnetic inductive coil. When the output of the motion sensor indicates onset of an environmental transient exceeding a predetermined threshold of intensity, the controller adjusts the electrical power input such that an electromagnetic field generated by the coil is sufficient to restrain the armature in a desired position during the environmental transient.