Abstract: An acoustic treatment for the air ducts of a gas turbine engine. The acoustic treatment generally includes a facesheet having a plurality of holes therein, a backplate spaced apart from the facesheet, and a plurality of interconnected cells between the facesheet and backplate. Each of the cells is defined by walls attached to the facesheet and the backplate, and at least some of the walls are formed of a porous material so that air is able to flow through the cells in a direction parallel to the facesheet and backplate.

Abstract: A solder bump is stenciled onto a substrate, providing bumped substrate at pitches below 400 microns. The solder is applied through stencil/mask and paste method; the mask, however, remains attached to the substrate during reflow. Pitches of greater than 400 microns may also be obtained through the invention. The invention further provides for generation of uniform, controllable volume metal balls.

Abstract: A cursor controller with a handle which moves in X, Y directions has the handle cantilevered on a upper platform which slides on an intermediate platform in an X direction with the axis of the handle intersecting the effective center of X guide means. And then the intermediate platform slides on a Y guide on a lower fixed platform, all of the foregoing being captured by a top cover. The top cover has a slot through which the handle, which is cantilevered on a bracket fixed to the end of the top platform, extends. The controller can be mounted directly on a keyboard or with a specially shaped enclosure to be operated by one hand.

Abstract: An actively controlled acoustic treatment panel for suppressing noise in a gas turbine engine nacelle including a backsheet formed by a planar matrix of adjacent individually controllable elements, where each of the controllable elements has a transducer and a honeycomb cell enclosing the transducer. A facesheet is also bonded to the controllable elements. A plurality of sensors are positioned within the acoustic treatment panel for sensing acoustic pressure of the noise propagated against the facesheet. A driver is provided for electrically driving each of the transducers to effect displacement thereof in a direction substantially perpendicular to the facesheet. Circuitry is also operatively connected to the pressure sensors and the driver for controlling velocity magnitude and phase of the transducers during displacement, wherein a resulting acoustic impedance at the facesheet achieves a desired acoustic impedance boundary condition at the nacelle.

Abstract: A solder bump is stenciled onto a substrate, providing bumped substrate at pitches below 400 microns. The solder is applied through stencil/mask and paste method; the mask, however, remains attached to the substrate during reflow. Pitches of greater than 400 microns may also be obtained through the invention. The invention further provides for generation of uniform, controllable volume metal balls.

Abstract: A solder bump is stenciled onto a substrate, providing bumped substrate at pitches below 400 microns. The solder is applied through stencil/mask and paste method; the mask, however, remains attached to the substrate during reflow. Pitches of greater than 400 microns may also be obtained through the invention. The invention further provides for generation of uniform, controllable volume metal balls.

Abstract: A solder bump is stenciled into a substrate, providing bumped substrate at pitches below 400 microns. The solder is applied through stencil/mask and paste method; the mask, however, remains attached to the substrate during reflow. Pitches of greater than 400 microns may also be obtained through the invention.

Abstract: An active liner for attenuating noise includes a rigid backplate supporting a piezoelectric panel. A pressure transducer is disposed in the panel for sensing acoustic pressure of noise being propagated against a face surface of the panel. A controller includes a predetermined schedule of acoustic impedance for controlling a displacement driver joined to the panel to effect a displacement velocity of the panel face surface for obtaining a predetermined acoustic impedance at the sensed acoustic pressure for attenuating noise.

Abstract: The invention is embodied in an articulated pawl. This pawl is designed to reliably drive a take-up reel on a tape and reel component feeder. By always engaging teeth on the reel, the pawl is prevented from skipping teeth during the return phase of the reel drive cycle. The addition of an articulated arm on the pawl prevents the pawl from skipping teeth on the reel during the drive phase of the reel drive cycle. The articulated arm ensures that either the tooth on the base of the pawl or the tooth on the articulated arm engages a tooth, or both engage teeth, on the reel during the drive phase. This invention ensures the positive and repeatable rotation of the take-up reel.

Abstract: An electromagnetic vibratory exciter having a non-linear elastomeric compression spring mounted in four quadrants around an electromagnet. The spring having curved armature contact surfaces of different heights on laterally opposite adjacent quadrants for providing selectable non-linear stiffening and deflection rates.

Abstract: An elastomeric compression element for an electromagnetic exciter unit which has a generally semi-circular outer periphery, an elongate inner periphery, end portions merging the inner and outer peripheries, a planar base surface and a contoured contact surface. The central portion of the element is dimensioned to have a height and thickness greater than that at the end portions for providing a non-linear spring action with the reciprocating free mass inside the unit during electromagnetic conduction.

Abstract: An electromagnetic vibratory exciter for use in vibratory equipment incorporates a free mass housed in an elongate housing having electromagnets mounted inboard at each end of the housing. The free mass is totally enclosed and carries a pair of armatures for cooperation with the electromagnets. An air gap is maintained during operation between the electromagnets and the armatures through the use of compression elements interposed between the electromagnet housing and the armatures of the free mass.

Abstract: An electromagnetic vibrating exciter for use in vibratory equipment incorporates a free non mass housed in an elongated housing having electromagnets mounted inboard at each end of the housing. The free mass is totally enclosed and carries a pair of armatures for cooperation with the electromagnets.An airgap is maintained during operation between the electromagnet and the armatures through the use of compression elements interposed between the electromagent housing and the armature of the free mass.

Abstract: A vibrating machine, such as an oscillating conveyor, vibratory feeder, or vibratory screen, is mounted to a plurality of supports by a suspension that isolates machine vibrations from the supports. The suspension includes a plurality of U-shaped stirrups extending transversely beneath the machine at intervals spaced longitudinally of the machine. Each U-shaped stirrup extends between a pair of opposed supports to which the stirrup is mounted for pivotal movement about an axis of rotation that extends transversely of the vibrating machine. This axis of rotation is along or near the axis of the instantaneous center of rotation of the stirrup. The stirrups support the vibrating machine at surfaces spaced below the axis of rotation. These stirrup surfaces are located to intersect an axis passing through the region of the center of percussion of the stirrup about the axis of rotation. Vibrations in a direction longitudinal of the vibrating machine impart a rotational motion to each stirrup.

Abstract: A phased treatment noise suppression panel is provided for use in an exhaust duct. The panel consists of individual sections designed with specific modal attenuation characteristics and located axially within the duct in such a sequential order, with respect to the noise source, as to take maximum advantage of modal redistribution effects on overall noise suppression.