Abstract:
Zur Realisierung komplexer Drehbewegungen, z.B. eine Drehbewegung die durch eine Linearverschiebung des Momentanpols und Winkeländerung der Drehachse relativ zum Bauteil charakterisiert werden kann, wird eine flexible und unter Umständen adaptiv steuerbare oder programmierbare Vorrichtung vorgeschlagen. Die Vorrichtung umfasst zumindest zwei Gelenkelemente sowie ein Verbindungselement, kann aber um weitere Elemente wie eine Sensoreinheit, Aktuierungseinheit, Übersetzungs- und Übertragungseinheit, Steuerungseinheit und im Hinblick auf Steifigkeit und Dämpfung speziell ausgelegte Kerne ergänzt werden. Die Steuerung kann beispielsweise nach vorgegebenen Kennlinien, z.B. im Hinblick auf die Achsstellung, oder belastungsabhängig erfolgen. Die Vorrichtung lässt sich z.B. in Exoskeletten, z.B. für untere Extremitäten integrieren, um die Kniebewegung (Beugen und Strecken) im technischen System abzubilden.
Abstract:
A sucker rod lifting system generally includes a surface drive mechanism, a sucker rod string, and a downhole pump. One such surface drive mechanism is known as a long-stroke pumping unit. The long-stroke pumping unit includes a counterweight which travels along a tower during operation thereof. Should the sucker rod string fail, there is a potential that the counterweight assembly will free fall and damage various parts of the pumping unit as it crashes under the force of gravity. The sudden acceleration of the counterweight assembly may not be controllable using the existing long-stroke pumping unit. The present disclosure generally relates to a braking system or an arrestor system for the counterweight assembly of a long-stroke pumping unit.
Abstract:
The present disclosure relates to the customization of a composite layer material for absorbing or dissipating mechanical energy under impacts or vibrations. The composite layer material comprises at least a support layer of a resilient material, said support layer having recessed fluid-tight microchannels comprising a fluid, wherein the channel section and fluid viscosity is such to dampen the external load by the constricted fluid flow through said microchannels. Therefore, the present disclosure relates to a maximization of safety and/or comfort.
Abstract:
L'invention concerne un système de contrôle du déplacement relatif d'une charge (P) comportant au moins un moyen d'amortissement (1) principal d'action longitudinale de course (C) de déplacement, et ayant deux extrémités, l'une étant liée à un bâti et l'autre étant liée à la charge, comprenant un dispositif de compensation comportant au moins un moyen d'amortissement secondaire d'action longitudinale ayant deux extrémités dont l'une est solidaire dudit bâti et l'autre est liée par une bielle (6, 7) à l'extrémité du moyen d'amortissement principal liée à la charge, ledit moyen d'amortissement secondaire étant disposé de façon à ce qu'en un point de la course C, le moyen d'amortissement secondaire a une action de direction orthogonale à la direction dudit déplacement.
Abstract:
The invention relates to a vibration absorber (10) capable of absorbing vibrations of a component, in particular of a vehicle, the vibration absorber (10) comprising: − at least one member (12) having a mass; − at least one duct (14) extending in the member (12), the duct (14) having an elongate extension and being filled with a liquid; and − a plurality of separate elements (16) each having a mass, the elements (16) being arranged in the duct (14) and surrounded by the liquid; wherein the vibration absorber (10) comprises a base element (18) via which the vibration absorber (10) is mountable on the component, the member (12) being pivotably connected to the base element (18) about at least one pivot axis (20).
Abstract:
A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.
Abstract:
A boom mounting assembly (20;120;220) for attachment to an agricultural application machine (10) is provided. The assembly comprises a boom support frame (22) which is suspended from a primary frame (24) mounted to a chassis. The boom support frame comprises a transverse beam (35) for supporting an intermediate section of a fluid application boom (16). The suspension mechanism allows both yaw and pitch of boom support frame relative to the primary frame resulting from fore and aft forces on the boom. Dampers (50, 52) are each connected between the primary frame and the boom support frame at a position spaced from the transverse centre of the assembly. Damping of pitch and asymmetrical yaw movement of the transverse beam away from a neutral position is controlled by the first and second dampers.
Abstract:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Schnittschlagdämpfung, bei der sich der Pressenstößel (4) auf Kolbenstangen (25) eines Hydrauliksystems abstützt, welches während des Schneidvorganges in Wirkverbindung zum Werkzeugunterteil bzw. zum Pressentisch (10) steht und über ein abgeschlossenes Ölvolumen verfügt.