Abstract: A noise reduction system for connecting a noise source with a body, having at least one piezoactuator for suppressing a noise transmission from the noise source to the body. The noise reduction system has a first carrying structure to be connected with the noise source and a second carrying structure to be connected with the body. The at least one piezoactuator is positioned in series with the carrying structures and connects them with each other, such that the at least one piezoactuator forms a structural loaded part.

Abstract: A diaphragm arrangement is disclosed to be fitted to a structural component or fixing ring for the purpose of generating sound. The diaphragm arrangement includes two piezo crystals fitted opposite one another on either side of an electrically conductive diaphragm, which can oscillate, and the piezo crystals are each fastened to the diaphragm. The piezo crystals are each electrically conductively connected to a contact plate on their opposing sides.

Abstract: An actuator mounting method for mounting at least one actuator involves providing a skin structure and at least one actuator, and fixing the at least one actuator to the inner surface of the skin structure.

Abstract: In order to maintain a surface region of an aircraft free of ice in a particularly energy-efficient manner, a device for deicing and/or for preventing ice formation is provided on an aircraft. The device includes a heat emitting device for emitting heat at a surface region of the aircraft, the heat emitting device is designed to dissipate heat along a line in order to produce a predetermined breaking point or a predetermined breaking line or parting line in ice accumulating on the surface region.

Abstract: A coating method for producing a function layer on mechanically loaded components or surfaces includes providing or applying a first material layer of a first material or substrate matrix having a mechanical flexibility higher than that of a second material on a substrate constituting the component or the surface, respectively, structuring the first material layer such that the material layer surface of the first material layer, which is opposite to the substrate, obtains a three-dimensionally moulded basic structure with projections and recesses, and coating the material layer surface of the first material layer with a second material layer of the second material in such a way that the second material layer adopts substantially the basic structure of the material layer surface with the projections and recesses. Also, surface layer structures can be produced by this method.

Abstract: A bistable fluid valve is characterized by two valve chambers which are arranged adjacent to one another and are closed off with respect to one another by a partition and each have an inlet opening and an outlet opening situated opposite one another, by an S-shaped elastic strip element which extends through both valve chambers, is articulatedly mounted in the region of the partition and can assume two positions in which it sealingly closes off either one or the other outlet opening, and also by an actuation element which is fastened to the strip element and by means of which the strip element can be switched between the two positions. The fluid valve according to the invention comprises only a single movable component of very low mass, which can thus operate in a fast-reacting manner.

Abstract: The invention relates to a fluid valve arrangement having a bistable fluid valve for at least one fluid line with a valve body which can be moved into two positions for two switching states, a pressure pulse generator being provided for valve switchover in the feed line for switching over a feed line and a return line between two flow lines, and the fluid valve comprising a reversing unit which has two chambers which are separated from one another by a bistable surface element, the two chambers being connected to the two flow lines and the bistable surface element being operatively coupled to the valve body in order to actuate it. As a result, a bistable fluid valve is provided which can be reversed by way of pressure pulses or pressure flanks and otherwise has no energy requirement.

Abstract: A device for reducing structural vibrations of aerofoils in an aircraft comprises, in the region of the aerfoil tips, at least one force generator (24a) acting substantially in the direction of movement of the vibrations. This arrangement has the advantage that such a force generator (24a) is considerably less susceptible to wear than conventional aerodynamic flaps and therefore effective vibration damping is possible with a reduced outlay on maintenance and greater efficiency.

Abstract: A force generator for mounting on a structure in order to introduce vibrational forces in a controlled manner into said structure for affecting vibrations is provided. The force generator includes at least one spring arm on which a flexural arm having an inertial mass and extending in the direction toward the attaching point is fastened, and having at least one piezo transducer at both ends of the spring arm. The center of gravity of the inertial mass is disposed in the region of the center of the spring arm. Alternatively, two guide springs are disposed on both sides of the spring arm parallel thereto, in order to generate a vibrational motion, wherein the fastening point of the flexural arm comprises an unchanged orientation during the vibrational motion.

Abstract: The invention relates to a diaphragm arrangement which is intended to be fitted to a structural component or fixing ring for the purpose of generating sound, having two piezo crystals which are fitted opposite one another on either side of an electrically conductive diaphragm which can oscillate, wherein the piezo crystals are each fastened to the diaphragm, which has a connection contact, in an electrically conductive and force-transmitting manner, and the piezo crystals are each electrically conductively connected to a contact plate on their opposite side. In this case, each contact plate has at least one contact strip which extends in the direction of the structural component and of which the end in each case has an electrical connection contact. The diaphragm arrangement can be excited by electrical voltages which can be applied to the three connection contacts.

Abstract: An improved actuator arrangement for operating a driven element with different actuators. The actuator arrangement comprises a first actuator that drives a driven element in a first direction via a first output member and a second actuator that drives the driven element in a second direction opposite to the first direction via a second output member. The first and second actuators are configured to work in a counter-acting manner to move the driven element in the first and second directions. An additional connecting and supporting device is connected between the first and second output members to support the output members to bear transversal forces transversal to the moving direction and/or to bear pre-load force for pre-loading the actuators.

Abstract: An electric circuit with one power amplifier (V1) for at least two piezoelectric actuators (C1, C2), said piezoelectric actuators (C1, C2) being in preferably antagonist arrangement connected mechanically in series and being connected electrically with each other and operated or clocked by a control circuit, such as a pulse modulator circuit, for time-variant energizing of the piezoelectric actuators (C1, C2) in push-pull fashion, said power amplifier (V1) being connected to a junction point between the two piezoelectric actuators (C1, C2), characterized in that said power amplifier (V1) is connected to a one directional diode (D1) and in that two buffer capacitors (C3, C4) and two static resistors (R3, R4) are provided downstream the one directional diode (D1) with regard to the power amplifier (V1).

Abstract: The invention relates to a force generator (10a) for mounting on a structure (12) in order to introduce vibrational forces in a controlled manner into said structure for affecting vibrations, comprising at least one spring arm (14) on which a flexural arm (22) having an inertial mass (24) and extending in the direction toward the attaching point is fastened, and having at least one piezo transducer (26) at both ends (16, 18) of the spring arm (14), wherein the center of gravity of the inertial mass (24) is disposed in the region of the center of the spring arm (14). Alternatively, two guide springs are disposed on both sides of the spring arm (14) parallel thereto, in order to generate a vibrational motion, wherein the fastening point of the flexural arm (22) comprises an unchanged orientation during the vibrational motion.

Abstract: A three-dimensional stack-type piezo element has at least one surface that is shaped perpendicular to layer planes of the stack, so that, at least in sections, it is not parallel to a stacking direction of the piezo element.

Abstract: A three-dimensional stack-type piezo element has at least one surface that is shaped perpendicular to layer planes of the stack, so that, at least in sections, it is not parallel to a stacking direction of the piezo element.

Abstract: A force generator is configured for attachment to a structure in order to controllably introduce vibrational forces into the structure in order to influence the vibration thereof. The force generator encompasses a flexural arm that is fastenable at least at one end to the structure; and an inertial mass that is coupled to the flexural arm remotely from the fastening end of the flexural arm; the flexural arm being equipped with at least one electromagnetic transducer, and a driving system being provided for the transducer, which system is set up such that by driving the transducer, it warps the flexural arm with the inertial mass and the transducer, and thereby displaces the inertial mass, in such a way that vibrational forces of variable amplitude, phase, and frequency are introducible into the structure.

Abstract: The aim of the invention is to produce an actuator system which also carries out combined adjusting movements, comprising linear and rotating displacement components. As a result, the actuators are connected together at the end points thereof by means of corner connections in such a manner that they form a closed, polygonal arrangement; the opposite corner connections of the actuator system are held together at a constant distance therebetween by means of rigid connections; the rigid connections can move freely with respect to each other and are connected in a flexible manner to the respective corner connections; the actuator system forms two outputs with the opposite corner connections.