Abstract: Various embodiments are directed to a method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument. The method comprises generating at least one electrical signal. The at least one electrical signal is monitored against a first set of logic conditions. A first response is triggered when the first set of logic conditions is met. A parameter is determined from the at least one electrical signal.

Abstract: A method for determining motional branch current in an ultrasonic transducer of an ultrasonic surgical device over multiple frequencies of a transducer drive signal. The method may comprise, at each of a plurality of frequencies of the transducer drive signal, oversampling a current and voltage of the transducer drive signal, receiving, by a processor, the current and voltage samples, and determining, by the processor, the motional branch current based on the current and voltage samples, a static capacitance of the ultrasonic transducer and the frequency of the transducer drive signal.

Abstract: A hub moment sensor is disclosed for an aircraft having a horizontal rotor, a rotor fixed mast for supporting the rotor above the aircraft body, and a support ring formed on the aircraft body for attachment to the rotor fixed mast. The sensor comprises an annular flange formed on the end of the rotor fixed mast remote from the rotor, and coupling means for securing the flange to the support ring, the coupling means including stress measuring means, whereby the moments acting on the aircraft may be sensed.

Abstract: A pneumatically actuated pressure transducer has a wiper assembly which is movable from an off position through a range of positions wherein the transducer has a varying voltage output. The pressure transducer comprises a high thermal conductivity substrate which forms a base for a potentiometer element and a resistance path coated onto the substrate. The resistance path includes a first area of low resistance material and a second area of high resistance material which meet in a chevron shaped transition zone. An insulating material coated onto the substrate defines the off position for the transducer.

Abstract: The work done by a sucker rod pump is read through the use of a pendulum potentiometer mounted on the walking beam of the pump and a load sensing pin located at the lower end of the wire line which is suspended from the horsehead. Meters mounted in a portable reading instrument show the maximum rod pull, the minimum rod pull, the stroke of the pump, and the area of the force-versus-stroke diagram. A display of the shape of the force-versus-stroke diagram may be given through the use of an X-Y plotter.