Showing papers by "Weingarten Realty Investors published in 2007"

Nonlinear and neural network-based control of a small four-rotor aerial robot

Abstract: Small four-rotor aerial robots, so called quadrotor UAVs, have an enormous potential for all kind of near-area surveillance and exploration in military and commercial applications. In addition, they offer the possibility to fly either in-or outdoor. However, stabilizing control and guidance of these vehicles is a difficult task because of the nonlinear dynamic behavior. This paper describes the development of a nonlinear vehicle control system based on a combination of state-dependent Riccati equations (SDRE) and neural networks. Some first simulation results underline the performance of this new control approach for the current realization.

Drive system of a forming press

Abstract: The invention relates to a drive system for a forming press for either increasing the output rate for a defined power or reducing the output rate for said power, the number and sequence of strokes, speed and force profiles being freely programmable. Another problem of the invention is to provide a very compact drive system which allows for a small height of the head piece for the drive of the press. A final problem of the invention is to allow for the adjustment of tilt of the ram for forming presses having a plurality of working points. The solution to these problems is to combine the advantages of hydraulic presses with regard to free programmability of path, speed and force profiles with that of mechanical presses with regard to increased output, rigidity and path-bound reproducibility of the lower point of regression. The invention is characterized in that one or more electric drives as servomotors are used in the form of a direct drive or in combination with a linear converter arranged downstream thereof and act upon a five-point knee lever in such a manner as to allow, in addition to free programmability of path, speed and force profiles, a flexible utilization of path and/or force-bound sequences of movement.

Verfahren und Vorrichtung zur Steuerung und Regelung der Stößelbewegung an servo-elektrischen Pressen

Abstract: Die Erfindung betrifft ein Verfahren zur Steuerung und Regelung der Stoselbewegung an servo-elektrischen Pressen und eine Vorrichtung zur Durchfuhrung des Verfahrens. DOLLAR A Dazu soll mittels einer einfachen Struktur der Steuerung und Regelung sowie einer geringen Anzahl von Verfahrensschritten ein praziser und reproduzierbarer Ablauf der Stoselbewegung sowohl in Phasen der Ragegeregelten als auch kraftgeregelten Bewegung des Stosels ermoglicht und ein geregelter Betrieb sowohl zwischen mehreren Stoseldruckpunkten eines Stosels, als auch mehrerer Stosel einer Pressenanlage jeweils untereinander und zu peripheren Einrichtungen fur eine hohe Ausstosleistung gewahrleistet werden. Daruber hinaus soll die Regelgute der bei ausermittiger Kraft nutzbaren Kippungsregelung eines mit mehreren Druckpunkten ausgestatteten Stosels bei hochdynamischen Ablaufen verbessert werden. DOLLAR A Das Verfahren besteht vor allem darin, dass zur Regelung der Stoselbewegung das Prinzip der leitwellengesteuerten elektronischen Kurvenscheibenregelung mit der Kraftregelung so kombinierbar ist, dass je nach Betriebsart die Bewegungsphasen des Stosels einerseits uber elektronische Positions-Kurvenscheiben und andererseits uber eine Kraftregelung oder Kraftbegrenzung steuerbar sind. Bei der Vorrichtung enthalt der zentrale Teil der NC-Steuereinrichtung fur den oder die Servomotoren zum Antrieb des oder der Druckpunkte eines oder mehrerer Stosel eine durch eine Funktionseinheit zur Vorgabe der Leitwellendrehzahl ...

Method for optimizing the transport displacement of workpieces in transfer presses

Abstract: A simulation method for optimizing transport displacement of workpieces in transfer presses is provided. Conclusions relating to the freedom of motion, number of strokes and program data for tool-specific machine control are determined by manipulating a displacement curve on a digital image of the transfer press which is determined by the simulation method.

Vorrichtung zur Herstellung pressgehärteter Blechbauteile

Abstract: Die vorliegende Erfindung bezieht sich auf die Ausfuhrung eines Werkzeuges zur Herstellung von pressgeharteten Blechbauteilen durch Umformung einer erwarmten Platine entsprechend bekannter Verfahren der Press-Hartung. Hierzu wird entsprechend der Technik eine Blechplatine auf eine Umformtemperatur erwarmt, in das Werkzeug eingelegt und umgeformt. Die Abkuhlung der umgeformten Werkstucke erfolgt mittels Kuhlkanalen, die sich in einer Trennflache zwischen Tragerplatten und den Aktivteilen befinden. Vorzugsweise handelt es sich um offene Kuhlkanale, welche in den Stempel, die Matrize und/oder die Tragerplatte eingearbeitet sind. Vorzugsweise bestehen die (austauschbaren) Tragerplatten aus einem Isolierwerkstoff (Duroplast).

Resource Allocation in Continuous Production using Market-Based Multi-Agent Systems

Abstract: Distributed resource allocation is a promising field for the application of multi-agent systems also in technical or industrial environments. The design of the multi-agent system then mainly comprises the definition of the agents' local knowledge and behavior as well as the definition of an interaction protocol for overall coordination. Most solutions of agent-based resource allocation however exist in static or discrete-event systems while the allocation of resources to continuous dynamic systems is hardly addressed. In order to derive the local and the interaction behavior of the agents, we refer to a mathematical formulation of the resource allocation problem as an optimization problem. Based on a marketlike coordination scheme, a new agent-based solution for the allocation of resources to continuous production processes is developed and applied to an industrial examples. The novelty hereby is the suitable combination of resource allocation and process control in continuous production.

Rolling tool with integrated drawing stage

Abstract: The invention relates to a method and a tool for producing cylindrical workpieces having longitudinal grooves, in which a drawing stage integrated in the tool precedes the actual rolling operation and in which the forming rollers (13) are mounted in two bearing shell halves (11,12).

Three-lever transfer system for workpieces, used in line of production presses, includes rotary lever raised at pivotal point and connected to swinging lever on carriage block

Abstract: The rotary lever (10) can be raised at its pivotal point, by a lifting drive (18) It (10) is connected to a swinging lever (11) The upper end of the swinging lever pivots on a carriage block (25) sliding vertically in a guide rail Its lower end is connected to a front arm (12) The arm is articulated to a suction bar (13) and a drive (19) swings the arm relative to the swinging lever One or more kinematically-similar functional modules (5, 20) carry out a sequence of movements which transfer workpieces between the presses : The transfer sequence follows A panel (21) is laid in the head press (2), with rotation of the workpiece (22) in the pressing tool plane A workpiece is taken from the lower tool of a double-acting press (2) The workpiece is carried, turned and laid into the following press (3) The workpiece is then carried without turning, into the following press (4) The workpiece is extracted from this press and laid down, with rotation in the tool plane, onto a conveyor belt (23), ending the sequence Using two transfer modules between the head press (2) and a first successive press (3), the workpiece is handed over from one transfer module to the other This takes place in the middle of the transport operation The transfer modules can be slid transversely with respect to the transfer direction (8) using guides (7), during changeover of the pressing tools This sliding capability at right angles to the transfer direction, can be used as a further dynamic production axis

Transporter for passing moldings between working stations of e.g. forming machines has cross-bar with suction grippers which is made up of two offset sections which can be adjusted to carry moldings of different sizes simultaneously

Abstract: Transporter for passing moldings (6, 7) between working stations of multiple transfer presses, press lines or forming machines has a cross-bar (10), on which suction grippers (8, 9) are mounted. The beam is made up of two sections (11, 12) which are offset in at least one direction and can be adjusted to carry moldings of different sizes and shapes simultaneously.

Rail track system monitoring method for use in railway system, involves evaluating detected position data with respect to trafficability and/or maximum permissible run-over speed of rail track system in monitoring region

Abstract: The method involves detecting position data of track with two rails (1) geometry in a monitoring region in a continuous sensory manner. The detected position data is evaluated with respect to trafficability and/or maximum permissible run-over speed of a rail track system in the monitoring region. The evaluated data is outputted, and optical and/or acoustic displays and/or control systems are controlled by a control unit. Twisting curves corresponding to twisting of a track are generated from the evaluated data during crossing, and are compared with permissible twisting curves. An independent claim is also included for a monitoring system for a rail track system, comprising a sensor and a control unit.

Device for cooling and / or heating bulk material

Abstract: A bulk material cooling and / or heating device (20) has a heat exchanger section (2) with a housing (5). In this heat exchanger tubes (7) are arranged in the gravity direction. Heat transfer fluid is passed through spaces (6) between the heat exchanger tubes (7). At the upper end of the heat exchanger tubes (7), a heat exchanger tube plate (14) is arranged, via which the upper ends of the heat exchanger tubes (7) are interconnected. Above the heat exchanger tube plate (14), a feed tube plate (14a) is arranged, via which feed tubes (14b) are connected to one another. Gas can be supplied to a gap (34) via a gas supply connection (41) which is formed between the heat exchanger tube plate (14), the feed tube plate (14a) and the feed tubes (14b). Lower ends of the feed pipes (14b) communicate with upper ends of the heat exchanger pipes (7) such that at the transition (32; 33; 36) between the lower ends of the feed pipes (14b) and the upper ends of the heat exchanger pipes (7) a gas passage (46) from the intermediate space (43) into the inlet pipes (14b) is possible. The result is a cooling and / or heating device, in which in particular an accumulation or caking of bulk material on inner walls of the heat exchanger tubes is practically reliably prevented.

Hydropneumatische Vorrichtung zur Druckübersetzung sowie Verfahren zum Betrieb einer hydropneumatischen Vorrichtung zur Druckübersetzung

Abstract: Es wird eine hydropneumatische Vorrichtung zur Druckubersetzung mit einem Arbeitskolben (3) und einem Ubersetzerkolben (17) zur Druckubersetzung auf den Arbeitskolben (3) vorgeschlagen, wobei der Ubersetzerkolben (17) einen Arbeitshubraum (19) fur einen Krafthub und einen Ruckhubraum (15) fur einen Ruckhub aufweist und wobei der Arbeitshubraum (19) fur den Krafthub mit einem Betriebsdruck beaufschlagbar ist. Erfindungsgemas sind Druckbeaufschlagungsmittel derart vorgesehen, den Ruckhubraum (15) beim Ablauf von Kraft- und Ruckhub zwischen einem Niedrighub, der zumindest ungefahr im Bereich von Atmospharendruck oder bei Atmospharendruck liegt, und einem Zwischendruck zu schalten, der zwischen dem Niedrigdruck und dem Betriebsdruck liegt. Des Weiteren wird ein Verfahren zum Betreiben einer hydropneumatischen Vorrichtung vorgeschlagen.

Device and method for producing profiled bodies

Abstract: The invention relates to a device and a method for producing longitudinal grooves in cylindrical workpieces, especially for producing longitudinal grooves having an irregular profile. The forming process is carried out by means of segmental wheels (13) in a similar manner to that of a rolling method.

Teilapparat für Nutenstanzautomaten mit Direktantrieb

Abstract: Es wird ein Teilapparat fur einen Nutenstanzautomaten vorgeschlagen, bei dem der Antrieb mittels eines Torquemotors direkt ohne Vorgelege mit der Teileinrichtung wirkverbunden ist.

Verfahren und vorrichtung zur schnittschlagdämpfung

Abstract: Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Schnittschlagdampfung, bei der sich der Pressenstosel (4) auf Kolbenstangen (25) eines Hydrauliksystems abstutzt, welches wahrend des Schneidvorganges in Wirkverbindung zum Werkzeugunterteil bzw. zum Pressentisch (10) steht und uber ein abgeschlossenes Olvolumen verfugt.

Study of Fission and High-burnup Induced Restructuring of Nuclear Fuel Ceramics - Applying Computer Science to Investigate Kinetic Process

Abstract: To improve understanding of radiation damage and recovery process, especially under condition of high energy and high fluence irradiation, is currently studied at the new cross-over project (NXO). Most severe irradiation is realized by fission fragments in nuclear fuel. A guiding experiment is taken from experience in power generating Light Water Reactor (LWR) fuel. At high burnup around 7%FIMA, fuel ceramics do have restructuring of the grain sub-division where diameter of grains change down to 50 to 200 nm. The NXO investigates the process mechanism crossing over research activities of universities, national and private laboratories. Simulation studies are being performed to find principal and triggering processes, using accelerator irradiation and computational calculations. Accelerator irradiation partly succeeded to reproduce the process outside of the fission reactor using simulation material of CeO2. High resolution TEM observations, comparing microstructure changes of high burnup reactor fuel and the simulated material, shows that principal process is polygonization and indicates that Oxygen defects and planar structures, of different scales, have key role on the kinetics. Basic research works of computing science, including first principle calculations, molecular dynamics, Monte-Carlo, and meso-scale cellular automata modeling are underway. Framework of computational study is based on understanding of the repeat of passing of fission-fragment tracks, which provide overheating and quenching cycles in time domain. It throws local atoms into higher energy quasi-stable placement and configurations. Extensive experimental observations, previously obtained and presently gained by accelerator irradiations, enable the analyses to focus into key configurations in search of the target process. Stability of planar precipitation of Xenon atomson [111] plane of the fluorite structure were demonstrated by molecular dynamics calculation. Complex kinetic processes, including stability and collective behavior, of interstitial Oxygen atoms are investigated by first principle calculations, molecular dynamics and Monte-Carlo studies. Statistical irradiation-dynamics, for studying repeated energy-deposit cycles, may enable to draw kinetic phase diagrams. Discussions were made to have statistical counting of possible repeated traces, in relevant narrowed “investigation range” defined in time domain, configuration space and local energy.

Verfahren zum Herstellen einer insbesondere mittels eines Tintenstrahldruckverfahrens bedruckbaren Papieroberfläche, Papierbahn sowie damit beschichteter Gegenstand

Abstract: Verfahren zum Herstellen einer insbesondere mittels eines Tintenstrahldruckverfahrens bedruckbaren Oberflache, wobei eine beidseitig offenporige, saugfahige Papierbahn (10) von einer Unterseite (12) her derart mit dem flussigen Kunstharz (14) getrankt wird, dass das Kunstharz die Papierbahn (10) nicht vollstandig durchdringt, so dass ein an eine Oberseite (16) angrenzender Bereich der Papierbahn (10) zumindest weitgehend frei von Kunstharz (14) bleibt und fur das Bedrucken verfugbar ist.

Systemische Aufstellungen und lösungsfokussierte Beratung in der Schulpraxis

Abstract: Die Durchfuhrung einer systemischen Aufstellung und losungsfokussierten Beratung stellt eine Moglichkeit dar, Studierenden Hilfestellungen fur die Verbesserung ihrer unterrichtlichen Handlungsfahigkeit zu geben, wenn beobachtbare Probleme im unterrichtlichen Handeln auf ungunstige Wirklichkeitskonstruktionen uber Unterricht und die eigene Rolle zuruckgefuhrt werden konnen. Nach einer Klarung grundsatzlicher Vorannahmen zu systemischen Aufstellungen und losungsfokussierter Beratung wird der Ablauf eines solchen Vorgehens beschrieben und anhand eines Fallbeispiels verdeutlicht. Zum Abschluss wird auf die Wirkungsweise systemischer Aufstellungen eingegangen.

Automatic Focusing of a Motorized Photo Slit Lamp Microscope

Abstract: The slit lamp microscope is the most popular opthalmologic instrument comprising a microscope with a light source attached to it. The coupling of microscope and light source distinguishes it from other optical devices. In this paper an Auto Focus system is proposed that considers this mechanical coupling and compensates for movements of the patient. It tracks the patients eye during the focusing process and applies a robust contrast-measurement algorithm to an area relative to it. The proposed method proved to be very accurate, reliable and stable, even starting from very defocused positions.

Method and device for the control and regulation of position deviations of tappets in servoelectric presses

Abstract: The invention relates to a method for the control and regulation of position deviations of tappets in servoelectric presses. The aim of the invention is especially to influence the position deviations of a tappet during the passage through the lower reversal point in such a way that the depth of immersion and the tilting position of the tappet can be controlled or regulated.

Industrial metal forge with integral scale removal and work piece transport and mechanical handling mechanism

Abstract: A forge has a scale-removing assembly (2) from work-pieces (4) on the main pedestal. The scale-removing assembly forms part of the work-piece transport (6) and mechanical handling system. The scale-removing assembly operates in cycles synchronized with that of the forge. The de-scaling chamber (10) and hood (9) are an integral part of the forge assembly. During the de-scaling process the work piece is transported by spring (17) pressure past an overhead circular array of downward-directed high-pressure water jets (11) on the inner face of the de-scaling cabin (18). The work piece is subsequently removed from the chamber by the action of a hydraulic or pneumatic cylinder.

Forming press with a drawing cushion function integrated into the sliding table

Abstract: The invention relates to a forming press in which the drawing cushion functions (3) or parts thereof, such as, for example, the drives (5) and the displacement and force transmission means, are integrated into one or more sliding tables (1)

Plate shears to cut steel plate or strips have upper and lower blade with cutting edges, table, cutting gap adjustment device, cutter bar bearing lower blade and secondary cutter bar whereby space between bars can be altered

Abstract: Plate shears (1) have upper blade with cutting edge, lower blade (UM) with cutting edge (SUM), table, cutting gap adjustment device (3) and cutter bar (4) which bears the lower blade and secondary cutter bar (5). Space between cutter bar and secondary bar can be altered.

Device e.g. for clinching components, has die device and stamp device with die having several crossed cavities and each cavity is assigned with its own stamp element

Abstract: The device (1) has a die device (2) and a stamp device (3). The die has several crossed cavities (5, 6) and each cavity is assigned with its own stamp element. An independent claim is included for a method.

Workpiece e.g. single workpiece, transport and position changing device for e.g. press, has drives designed as gear and assigned to drive designed as servomotor to operate on toolings, where movement of toolings is produced simultaneously

Abstract: The device has a transfer line (15) with presses and a crossbar (2) with replaceable toolings (3, 17) for handling a workpiece (16), where the crossbar is moveable between stations of the transfer line. The toolings are movable relative to the crossbar by a drive (5) designed as a servomotor (14). Drives (6, 7) are designed as a gear (G) and are assigned to the drive (5) for operating on the toolings, where a movement of the toolings in different degrees of freedom (x, x `, y, y `, z, z `, dx, dx `, dy, dy `, dz, dz `) is produced simultaneously and for same time by each drive.

Method for operating hydro-pneumatic device for pressure transmission, involves displacing hydraulic fluid from storage chamber, and draining hydraulic fluid volume in storage chamber below ventilation opening into storage chamber

Abstract: The method involves transmitting pressure on a working piston by a translator piston (9). An accumulator piston (3) is provided for an express movement of the working piston by displacing hydraulic fluid from a storage chamber (12). Air, introduced in the storage chamber in a maintenance operation, is let out from the storage chamber. A hydraulic fluid volume in the storage chamber is drained below a ventilation opening (13) into the storage chamber. An independent claim is included for a hydraulic fluid pump for maintenance of a hydro-pneumatic device for a pressure transmission.

Heiß-flüssiges Polymer als Schutzschicht auf Kunststoffoberflächen

Abstract: Die vorliegende Erfindung betrifft Verfahren zur Erzeugung einer ablosbaren Schutzschicht auf der Kunststoffoberflache eines Gegenstandes, die Schritte enthaltend (a) Aufbringen eines heis-flussigen, bei Raumtemperatur festen, einen Film bildenden Polymers auf die zu schutzende Kunststoffoberflache und (b) auf Raumtemperatur abkuhlen und Aushartenlassen des Polymers. Die Erfindung betrifft weiterhin Gegenstande mit einer solchen ablosbaren Schutzschicht sowie die Verwendung eines heis-flussigen, bei Raumtemperatur festen, einen Film bildenden Polymers zur Erzeugung einer abziehbaren Schutzschicht auf der Kunststoffoberflache eines Gegenstandes.