Abstract: A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

Abstract: A multi-path fluid flow control valve for a shock absorber that restricts fluid into a first path while opening fluid flow to a second path when a given fluid flow velocity is reached. Exemplary configurations of this diverter valve are disclosed such as a spring loaded disc valve with face sealing lands, and a spool valve with diametric sealing lands. Applications include active suspension dampers in order to limit maximum RPM into a hydraulic motor. For such a system, in one mode the diverter valve allows fluid to move unrestricted into the hydraulic motor. When fluid velocity reaches a tunable set point, in a second mode the diverter valve restricts flow into the hydraulic motor and bypasses it shuttling fluid into the opposite side of the damper. In some cases progressive damping valves are utilized in series or parallel to smooth damping characteristics during, before, and after transitions.

Abstract: A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

Abstract: Methods and apparatus are provided for sampling an indicator of the internal state of an embedded system or integrated circuit, where the indicator is sampled in a manner synchronous to the internal clock of the embedded system or integrated circuit. The resulting samples can be used for determining secret data within the embedded system or integrated circuit, detecting failures, or detecting counterfeit devices.

Abstract: A method of on-demand energy delivery to an active suspension system comprising an actuator body, hydraulic pump, electric motor, plurality of sensors, energy storage facility, and controller is provided. The method comprises disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

Abstract: A PCB footprint consisting of a plurality of pads, positioned such that many different electronic components can be mounted which would otherwise require a custom circuit board. One or more of the leads can be connected via a low-impedance path to a ground plane, making a suitable platform for prototyping high-frequency designs.

Abstract: A system for performing a downhole operation including a tubular string having a locking profile non-movably located therewith. At least one member is movably mounted with the string and includes an engagement profile. A tool is runnable with the string and has at least one sub with a key. The key is selectively engagable and disengagable with the engagement profile for enabling the tool to control movement of the member with respect to the string when engaged therewith. The key is engagable with the locking profile for restricting relative movement between the string and the tool when engaged therewith. A method of performing a downhole operation is also included.

Abstract: Hydraulic pumps/motors are used to convert between rotational motion/power and fluid motion/power. Pressure differential is achieved across the pump/motor by applying torque to either aid or impede rotation which generally results in either a pressure rise or pressure drop respectively across the unit. This torque is often supplied by an electric motor/generator. Especially in positive displacement pumps/motors this pressure differential is not a smooth value but rather it contains high frequency fluctuations known as pressure ripple that are largely undesirable. With thorough analysis it can be discovered that these fluctuations occur in a predictable manner with respect to the position (angular or linear) of the pump/motor. Using a model that contains this information, a feed-forward method of high-frequency motor torque control is implemented directly on the hydraulic pump/motor by adding to the nominal torque, a model-based torque signal that is linked to rotor position.

Abstract: A method and system for measuring rotor position or velocity in an electric motor disposed in hydraulic fluid. The system comprises a contactless position sensor that measures electric motor rotor via magnetic, optical, or other means through a diaphragm that is permeable to the sensing means but impervious to the hydraulic fluid. An electronic sensor is positioned outside the operating fluid, whereas the motor is located in the fluid volume.

Abstract: A method of on-demand energy delivery to an active suspension system is disclosed. The suspension system includes an actuator body, a hydraulic pump, an electric motor, a plurality of sensors, an energy storage facility, and a controller. The method includes disposing an active suspension system in a vehicle between a wheel mount and a vehicle body, detecting a wheel event requiring control of the active suspension; and sourcing energy from the energy storage facility and delivering it to the electric motor in response to the wheel event.

Abstract: Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described.

Abstract: Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described.

Abstract: Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described.

Abstract: Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described.

Abstract: Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described.

Abstract: A gravel packing system includes at least two packers with at least one of the two packers being sealable to an open hole, a barrier sealably engaged with the at least two packers defining an annular space between the open hole and the barrier, a cross-over tool operably connectable to at least one of the at least two packers and the barrier, and at least one regulator in operable communication with the barrier configured to maintain a substantially constant pressure in the annular space while gravel is packed at a location downstream of at least one of the at least two packers, downstream being defined by a direction of travel of gravel being packed.

Abstract: A method and system for supporting Wake-on-LAN technology in a virtualized environment is described. An improved virtual switch comprises a listener, which receives a power-on message on behalf of virtual machines, extracts addresses of the virtual machines to be powered on, which are embedded in the power-on message, compares the extracted addresses with addresses of the virtual machines stored in a database, and selectively powers on those virtual machines for which the extracted and stored addresses match.

Abstract: The present invention is directed to tissue engineering and, more particularly, to devices and methods that are used to pattern or deposit cells to simulate a tissue type in two dimensions or in three dimensions or a cell migration device, a materials testing device for cell proliferation, migration or cell seeder for the Bioflex® flexible bottom culture plates or comparable culture plates. The present invention operates by providing negative pressure to create multiple troughs or indentations for cells to attach and grow on or in the Bioflex® flexible bottom culture plates. The present invention is also directed to a device and method for simulating a tissue wound using the above devices.

Abstract: The invention provides a forearm type of crutch comprising an operatively upright staff having a ground engaging foot at one end and a transverse handle and forearm support assembly at the operatively upper end, and wherein the angle of inclination of the forearm support assembly to the staff is adjustable, wherein the angle of inclination of the forearm support assembly relative to the staff is adjustable by means of a pair of co-operating positioning portions, one being stationary relative to the staff and the other being stationary relative to the forearm support assembly and wherein the positioning portions have complementarily co-operating zones that are engagable in different angular positions of the forearm support assembly and staff to provide a desired angle of inclination of the forearm support assembly relative to the staff and wherein releasable clamping means operatively hold the positioning portions in a selected engaged position for use.