Abstract: Systems and techniques are provided for a piezoelectric transducer. A base plate includes a first electrical contact and a second electrical contact. A transduction element is mounted directly on the base plate and electrically connected to the first electrical contact. A spacer includes a via. The via includes electrically conductive material. The spacer is mounted on the base plate around the transduction element and the electrically conductive material of the via is electrically connected to the second electrical contact. A diaphragm is mounted on the spacer and on the transduction element.

Abstract: Systems and techniques are provided for a piezoelectric transducer. A base plate includes a first electrical contact and a second electrical contact. A transduction element is mounted directly on the base plate and electrically connected to the first electrical contact. A spacer includes a via. The via includes electrically conductive material. The spacer is mounted on the base plate around the transduction element and the electrically conductive material of the via is electrically connected to the second electrical contact. A diaphragm is mounted on the spacer and on the transduction element.

Abstract: An energy harvester coupled to a vibration source includes a housing, a transducer, and an amplifier. The transducer may have a first part and a second part. The first part and the second part may move relative to each other along a central axis in response to a motion from the vibration source. The amplifier is coupled to the housing and operable to amplify an amplitude of the motion received from the vibration source. The amplifier has an input member coupled to the vibration source and an output member coupled to the first part of the transducer. The input member moves at a distance D1 in response to the motion from the vibration source. The output member moves the first part of the transducer in response to the input member moving. The first part of the transducer moves along the central axis by a distance D2, where D2>D1.

Abstract: A vibration isolation device comprises a frame for mounting on an engine casing, an axis to be mounted to an external component to isolate, a resilient member located between the frame and the axis, and a fuse mechanism ensuring that the vibration isolation device presents a first stiffness when loads applied to said vibration isolation device are below a predetermined threshold load, and a second stiffness, lower than the first stiffness, when loads applied to the vibration isolation device are at least equal to the predetermined threshold load. The fuse mechanism constrains the resilient member within a predetermined space when loads applied to the vibration isolation device are below the predetermined threshold load and to release the resilient member so that this latter is capable of deforming beyond said predetermined space when loads applied to the vibration isolation device are at least equal to the predetermined threshold load.

Abstract: Systems and techniques are provided for piezoelectric transducer array fabrication. A sheet of piezoelectric material may be diced into pieces of piezoelectric material. A sheet of elastic layer material may be spin coated with adhesive. The pieces of piezoelectric material may be placed onto the sheet of elastic layer material. Pressure may be applied to the pieces of piezoelectric material and the sheet of elastic layer material. The adhesive may be cured. Transduction elements may be cut from the pieces of piezoelectric material and the sheet of elastic layer material. Electronics may be mounted on a PCB mounting board. Adhesive may be applied onto the PCB mounting board. The transduction elements may be mounted on the PCB mounting board. A spacer may be mounted on the PCB mounting board. Adhesive may be applied onto the spacer and the transduction elements. Diaphragms may be mounted on the spacer.

Abstract: Systems and techniques are provided for a piezoelectric transducer. A base plate includes a first electrical contact and a second electrical contact. A transduction element is mounted directly on the base plate and electrically connected to the first electrical contact. A spacer includes a via. The via includes electrically conductive material. The spacer is mounted on the base plate around the transduction element and the electrically conductive material of the via is electrically connected to the second electrical contact. A diaphragm is mounted on the spacer and on the transduction element.

Abstract: An electromagnetic transducer includes a magnetic assembly and a coil assembly. The magnetic assembly may include an inner magnet subassembly and an outer magnet subassembly. The inner magnet subassembly and the outer magnet subassembly each have a plurality of axial magnets arranged in a stacked configuration with a spacer disposed between vertically adjacent axial magnets. The coil assembly includes an inner coil subassembly and an outer coil subassembly. The inner coil subassembly is disposed between the inner magnet subassembly and the outer magnet subassembly, and the outer coil subassembly is disposed around the outer magnet subassembly. The coil assembly and the magnetic assembly are configured to move relative to each other.

Abstract: An apparatus of the disclosure is directed to conical structure of an ultrasonic transducer. The conical structure may have a first circumference and a second circumference, respectively located at opposite ends of the conical structure, where the first circumference has a greater length than the second circumference. An angle may be formed between a plane including the second circumference and a surface of the conical structure, and a distance may be formed between the first and second circumferences. A rim may be coupled at or adjacent to the first circumference of the conical structure. An ultrasonic transducer may be coupled to the second circumference of the conical structure.

Abstract: An apparatus of the disclosure is directed to an elongated polygon transducer membrane having a perimeter that includes a plurality of edges and a plurality of vertices. The elongated polygon transducer membrane may be fixed to a support structure at or around a plurality of the vertices and not fixed to the support structure at more than 50% of the perimeter. The apparatus of the disclosure may be an elongated hexagon transducer membrane having a perimeter comprising six edges and six vertices. The elongated hexagon transducer membrane may be fixed to a support structure at or around two vertices of the six vertices that are most distant from each other and not fixed at the other vertices or the edges of the perimeter.

Abstract: An apparatus of the disclosure is directed to an elongated polygon-shaped transducer elastic layer having a first plurality of edges, a first plurality of vertices, and a first electrical connection at one of the first plurality of vertices. The apparatus includes an elongated polygon-shaped electrically active material layer having a second plurality of edges, a second plurality of vertices, and a second electrical connection at one of the second plurality of vertices, where the elongated polygon-shaped electrically active material layer is disposed on the elongated polygon-shaped transducer elastic layer to transform electrical excitation into a high-frequency vibration to produce ultrasonic acoustic emissions or transform received high-frequency acoustic vibration into electrical signals. The elongated polygon-shaped transducer elastic layer and the elongated polygon-shaped electrically active material layer may be hexagonal.

Abstract: A hydraulic torque compensation device comprises a pair of housings, a first housing including a first high pressure liquid chamber and a second low pressure liquid chambers, a second housing having a third high pressure liquid chamber, a fourth accumulator chamber, and a fifth low pressure chamber that is defined by a wall and an end of the second housing. A first main duct links the first chamber of the first housing to the third chamber of the second housing. A second main duct links the second chamber of the first housing to the fifth chamber of the second housing. Each housing also include a piston, the first chamber between a first piston body and an end of the first housing and the third chamber between a second piston body and the wall. The device ensures a counter action to engine loads when a positive torque is applied.

Abstract: A vibration isolation device comprises a frame for mounting on an engine casing, an axis to be mounted to an external component to isolate, a resilient member located between the frame and the axis, and a fuse mechanism ensuring that the vibration isolation device presents a first stiffness when loads applied to said vibration isolation device are below a predetermined threshold load, and a second stiffness, lower than the first stiffness, when loads applied to the vibration isolation device are at least equal to the predetermined threshold load. The fuse mechanism constrains the resilient member within a predetermined space when loads applied to the vibration isolation device are below the predetermined threshold load and to release the resilient member so that this latter is capable of deforming beyond said predetermined space when loads applied to the vibration isolation device are at least equal to the predetermined threshold load.

Abstract: A hydraulic torque compensation device comprises a pair of housings, a first housing including a first high pressure liquid chamber and a second low pressure liquid chambers, a second housing having a third high pressure liquid chamber, a fourth accumulator chamber, and a fifth low pressure chamber that is defined by a wall and an end of the second housing. A first main duct links the first chamber of the first housing to the third chamber of the second housing. A second main duct links the second chamber of the first housing to the fifth chamber of the second housing. Each housing also include a piston, the first chamber between a first piston body and an end of the first housing and the third chamber between a second piston body and the wall. The device ensures a counter action to engine loads when a positive torque is applied.

Abstract: An electromagnetic transducer includes a magnetic assembly and a coil assembly. The magnetic assembly may include an inner magnet subassembly and an outer magnet subassembly. The inner magnet subassembly and the outer magnet subassembly each have a plurality of axial magnets arranged in a stacked configuration with a spacer disposed between vertically adjacent axial magnets. The coil assembly includes an inner coil subassembly and an outer coil subassembly. The inner coil subassembly is disposed between the inner magnet subassembly and the outer magnet subassembly, and the outer coil subassembly is disposed around the outer magnet subassembly. The coil assembly and the magnetic assembly are configured to move relative to each other.

Abstract: An energy harvester coupled to a vibration source includes a housing, a transducer, and an amplifier. The transducer may have a first part and a second part. The first part and the second part may move relative to each other along a central axis in response to a motion from the vibration source. The amplifier is coupled to the housing and operable to amplify an amplitude of the motion received from the vibration source. The amplifier has an input member coupled to the vibration source and an output member coupled to the first part of the transducer. The input member moves at a distance D1 in response to the motion from the vibration source. The output member moves the first part of the transducer in response to the input member moving. The first part of the transducer moves along the central axis by a distance D2, where D2>D1.