Abstract:
Method and apparatus for determining that a pressure field is applied on a structure. A plurality of acoustic waves are generated within the structure using at least one wave generator and a plurality of measurements of the acoustic waves is taken using at least one wave sensor. A pressure field applied to a surface of the structure is determined by processing at least two of the plurality of measurements. The wave generator and the wave sensor may be piezoelectric elements, which may alternate between acting as the wave generator and the wave sensor. Processing the measurements may comprise obtaining a differential measurement value and comparing the value to a threshold. Determining that the pressure field is applied may comprise processing the measurements using a model based on acoustic wave propagation or experimental results. The processing may provide a mapping of the pressure field of an object on the structure.
Abstract:
The present invention relates to an apparatus for comparatively measuring the power of pulse tools. Such apparatuses are already known from the prior art but, on account of the design, exhibit very great awkwardness when adapting the test environment to different tools. This is intended to be simplified according to the invention in order to save refitting times. This is achieved by redesigning an apparatus of the generic type by virtue of a spring element being arranged directly below a test bolt used. The spring element can already be removed by simply unscrewing the test bolt and can be replaced with another spring element.
Abstract:
Eine elektronische Schaltung umfasst einen ersten Chip und einen zweiten Chip, die über einen ersten Bonddraht miteinander verbunden sind. Dabei ist der erste Bonddraht vorgesehen, ein Nutzsignal zu übertragen. Der erste Chip und der zweite Chip sind außerdem über einen zweiten Bonddraht miteinander verbunden, der vorgesehen ist, kein Nutzsignal zu übertragen.
Abstract:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Messung und Bewertung einer Messkennlinie (8), bei der mittels mindestens eines Messgeräts oder eines Aufnehmers (3, 4) eine Reihe physikalischer Größen erfasst und in einer Auswertevorrichtung (1) in elektrische Signale umgewandelt und gespeichert werden. Zur Auswertung wird die Messkennlinie (8) mittels vorgebbarer Bewertungskriterien in der Auswertevorrichtung einer Bewertung unterzogen. Die Erfindung ist dadurch gekennzeichnet, dass die Bewertung mindestens durch ein Bewertungswerkzeug in Form einer Bewertungshantel (9, 9.1 bis 9.6) bestimmt wird. Dabei stellt die Bewertungshantel (9, 9.1 bis 9.6) in einem vorgegebenen Messgrößenbereich der Messkennlinie (8) eine definierte lineare Bewertungsstrecke (10) mit einem vorgebbaren Anfangspunkt (11) und einem vorgebbaren Endpunkt (12) innerhalb eines Koordinatensystems (7) dar.
Abstract:
The invention relates to an algorithm for detecting activation of a tactile pressure sensor having a mechanic structure comprising the steps consisting of: (a) measuring periodically an input quantity (V 0 ; f 0 ) of the sensor, when it is not pressed, the period being set according to sensor dynamic requirements; (b) computing a current idle quantity (V idle ; f idle ) depending on the input quantity (V 0 ; f 0 ) measured at step a); (c) computing an activation threshold (ΔV P ; Δf Ρ ) based on a quantity characterization of the sensor mechanic structure and depending on the idle quantity (V idle ; f idle ) defined at step b); (d) comparing the sensor input quantity (V 0 ; f 0 ) with the last defined idle quantity (V idle ; f idle ) increased by the activation threshold (ΔV P ; Δf Ρ ) computed in step c) in order to determine whether the sensor is pressed or not.
Abstract:
The invention provides a variable torque-rate test joint for the performance testing of rotary tools for threaded fasteners. In a typical test routine a nut (1) is repeatedly tightened by the tool and after each tightening the nut (1) must be released and run back to its start position. The invention provides a means for rapidly releasing the pressure on the tightened nut (1) so that it can be run back quickly and easily. The variable joint is supported by a reaction surface (4) that is the operative face of a piston and cylinder assembly (9, 11) seated on a shoulder (8) fast to a shank (2) of the threaded fastener. A hydraulic control (12, 13) is provided for the piston and cylinder assembly (9, 11), including means for hydraulically extending the piston from (11) the cylinder (9) to a fixed maximum extension which defines a test position of the reaction surface (4), and means for hydraulically retracting the piston (1) back into the cylinder (9) to remove the pressure from the nut (1) at the end of the test. During tightening the piston (11) is extended and preferably hydraulically locked.
Abstract:
A test device for screwers, comprises a transducer (11) having a head (28) with a seat (19) for receiving the coupling end (13) of an adapter or joint simulator (12, 12'). The coupling end (13) is made with a side wall (21, 21') polygonally- fashioned in order to be received in the seat (19), achieved in a complementary polygonal manner. The head (28) can be tightened as a clamp in order to releasably lock, in the seat (19), the coupling end (13) of the adapter or joint simulator.