Abstract:
Die Erfindung betrifft ein Verfahren und eine dazu geeignete Vorrichtung zur Überwachung des Zustandes einer Kraftmessvorrichtung, insbesondere einer Wägevorrichtung, mit einer beweglichen Kraftübertragung, welche eine auf die Kraftmessvorrichtung wirkende Kraft einem Messumformer zuleitet, welcher ein zur einwirkenden Kraft korrespondierendes Messsignal erzeugt, das dann zur Anzeige gebracht oder zur weiteren Verarbeitung weitergeleitet wird. Dabei wird mindestens ein die Beweglichkeit der Kraftübertragung oder deren zeitliche Änderung charakterisierender Parameter ermittelt, der Parameter wird dann mit mindestens einem Schwellwert verglichen und in Abhängigkeit davon eine Aktion der Kraftmessvorrichtung ausgelöst.
Abstract:
A method is disclosed of analysing a structural member (10) in a tensioned condition, where at least one calibrating measurement of a predetermined dimension (L x ) of said structural member (10) has been taken from a predetermined first position (14) on the structural member (10) to a second position (19) on structural member, and the, or each, calibrating measurement has been recorded. The method comprises taking a further measurement of the predetermined dimension (L x) of the structural member (10) in the tensioned condition from the predetermined first position (14) to the second position (19), and comparing the, or at least one of the, calibrating measurements with the further measurement to provide an indication of the tension in the structural member (10).
Abstract:
Eine Kalibriervorrichtung für einen Prüfstand weist zwei Hebeleinrichtungen (1, 2) auf. Jede der Hebeleinrichtungen (1, 2) weist ein um eine Drehachse (5) verschwenkbares Hebelelement (6), eine an einem Ende des Hebelelements (6) vorgesehene Gewichtsaufnahme (7), auf der unterschiedliche Gewichtslasten (10) anbringbar sind, und eine an einem dem einen Ende bezüglich der Drehachse (5) gegenüberliegenden anderen Ende des Hebelelements (6) vorgesehene Verbindungseinrichtung (8) zum Verbinden des Hebelelements (6) mit einer Lasteinrichtung (20) des Prüfstands auf. Die Hebelelemente (6) sind derart angeordnet, dass die Gewichtsaufnahme des einen Hebelelements (6. 1) bezüglich einer Mittelebene (11) der Kalibriervorrichtung auf einer Seite angeordnet ist und die Gewichtsaufnahme (7.2) des anderen Hebelelements (6.2) bezüglich der Mittelebene (11) auf der anderen Seite angeordnet ist.
Abstract:
A method of calibrating the torque outputs of a rheometer by using a calibrating object with a certified moment of inertia, measuring the moment of inertia of the calibrating object using the rheometer, and calculating the torque adjustment factor by dividing the certified moment of inertia value by the measured moment of inertia value. The torque adjustment factor is applied to correct subsequent measurements of rheological properties conducted using the rheometer. The torque adjustment factor may be double-checked for reproducibility by measuring the moment of inertia of the calibrating object, correcting it with the torque adjustment factor, and comparing it with its certified moment of inertia value.
Abstract:
A torque transducer assembly includes a first shell (18) having a threaded neck (22) and a distal end (26). A second shell (20) is also provided. A sensor module (36) includes a first frame member, a second frame member, and a sensor. The first frame member is attached to the first shell and the second frame member is attached to the second shell such that the first and second shells are coupled to one another. A method of manufacturing a torque transducer assembly is also provided. A packaging system including a torque transducer assembly is additionally provided.
Abstract:
A method for adjusting a magnetization of a magnetizable object, the method comprising the steps of providing an object having a magnetized portion extending along at least a part of the object, arranging at least one degaussing element adjacent to the magnetized portion, and degaussing a part of the magnetized portion by activating the degaussing element to adjust the magnetization of the magnetizable object by forming a demagnetized portion of the object directly adjacent to a remaining magnetized portion of the object.
Abstract:
A process (50) for removing a modulation sinusoidal error from signals of a rotating load cell measuring forces and/or moments with respect to a non-rotating orthogonal coordinate system includes mounting the load cell to the rotating object and obtaining a first set of signals from the load cell, wherein at least one signal of the first set of signals is indicative of a load as the object rotates. A characterization of a modulation error is obtained from the first set of signals. The modulation error is a periodic signal having a frequency greater than and proportional to a frequency of revolution of the load cell. A second set of signals is calculated as a function of the characterization of the modulation error from the first set. The calculated modulation error in the second set of signals is substracted from the second set of signals.
Abstract:
A pressure-sensitive transducer provided with a circuit for reducing the output offset and offset drift of a pressure-sensitive resistor and a circuit for reducing the variation of the resistance value of the pressure-sensitive resistor and the variation of the output caused by the variation of change characteristics of the resistance value. The transducer comprises a pressure-sensitive resistor (1), a control means (2) which is an electric circuit means adapted to measure an electrical characteristic of the pressure-sensitive resistor, connected to the pressure-sensitive resistor, including A/D converters (3,4), a D-A converter (6) and a memory (5), and adapted to correct the electrical characteristic changed by the variation in resistance value of the pressure-sensitive resistor and output the correction value from the D/A converter (6), a temperature sensor connected to an A/D input terminal of the control means, and an adjustment value input terminal (7) for inputting the error between the electrical characteristic of the pressure-sensitive resistor and the reference characteristic to an A/D input terminal of the control means. Thus the device is provided with a circuit for reducing the output offset and the offset drift of the pressure-sensitive resistor.
Abstract:
A device (40) for the detection of mechanical forces exerted on a rail such as a railway rail (17), comprising a mechanical detection element (41), which is coupled to said rail (17), and sensor means (45). The sensor means (45) are built up of at least two sensors that are in mechanical contact with each other, which elements are each provided with terminal electrodes, wherein one element is of a first type, arranged for exerting a mechanical force under the influence of an electric signal applied to its terminal electrodes, and wherein another element is of a second type, arranged for providing an electric signal at its terminal electrodes under the influence of a mechanical force being applied thereto. The mechanical detection element (41) and the sensor means (45) are in engagement with each other, in such a manner that mechanical forces exerted on the rail (17) during use are transferred to the sensor means (45) by the detection element (41). An alternating and/or pulsating electric signal is thereby continuously applied to the connecting electrodes of an element of the first type, and the electric signal provided at the terminal electrodes of an element of the second type is a measure for the mechanical forces exerted on the rail (17). In this manner the device has a "sel-monitoring" or so-called "fail safe" operation, as is required for many rail transport systems. The sensor elements of the first and the second type are preferably of a piezoelectric material.
Abstract:
This invention is concerning a precalibrated multi-component sensor, here called a master balance, intended for determination of applied forces and moments in the calibration of multi-component sensors, here called object balance, normally used for aerodynamically tests in wind tunnels. During the calibration procedure, the object balance is connected in series with the master balance, which in turn is fastened to a frame, here called a calibration rig. Characteristic for this invention is that the master balance is fastened to the calibration rig frame by an attachment joint in a plane perpendicular to the main axis, common to master and object balances, with the attachment joint being lifted up to the same or nearly the same level as the moment center of the object balance.