Abstract:
A fatigue testing system (100) provides simultaneous cycle testing for a plurality of prosthetic devices under simulated physiological loading conditions. A plurality of sample holders (129) containing test samples (130) of prosthetic devices is positioned between a distribution chamber (126) and a return fluid chamber (136) to form an integrated test chamber (106). A reciprocating linear drive motor (105) operates a rolling bellows diaphragm (115) to cyclically pressurize fluid within the test chamber (106) and drive the pressurized fluid through the prosthetic devices (130) being tested. The test chamber (106) defines a return flow conduit (124) in fluid communication with each of the sample holders (129), the return fluid chamber (136), and the distribution chamber (126). Compliance chambers (135) and throttle valves (132) associated with each of the sample holders (129) regulate the pressure gradient and back pressure across the prosthetic devices (130) being tested.
Abstract:
An orthopedic simulator, such as a spinal implant wear test machine, is provided with a specimen containment module that may be removed from the machine as a unit. The releasable attachability of the specimen containment module permits remote specimen installation and reduces environmental contamination.
Abstract:
A transmission for torque transfer with axial compliance and a test machine employing the transmission has a flexible connector that provides high torsional stiffness and high axial compliance while inducing no frictional forces. The transmission includes an axial portion allowed to translate freely along its axis due to a high axial compliance of the transmission while the transmission simultaneously facilitates rigid torque transfer.
Abstract:
A multi-sample biologic material stimulation and characterization system includes individual flow paths for each sample. Each individual flow path can maintain sterile conditions and may be chemically monitored. The mean flow rate and pulsatile flow rate through each sample may be individually controlled. Pressure at the sample is controlled independently of the flow rate through downstream variable flow restrictors. An axial force may be applied to each sample. A radial force may be applied via hydrostatic pressure of chamber fluid surrounding each sample. A real-time controller manages the system and saves information gathered from the transducers and actuators of the system.
Abstract:
The invention relates to a testing device for fuselage shells, wherein the test piece is connected to a complementary cross-sectionally U-shaped structure with legs, wherein longitudinal flanges are provided at the ends of the legs in the longitudinal direction of the complementary structure, with means for fixing the fuselage shells to the complementary structure and also for introducing and receiving corrective forces, and transverse flanges are provided at the limitations of the complementary structure in the longitudinal direction, for introducing and receiving testing forces in six degrees of freedom. The complementary structure (1) is formed as a soft box of composite materials and the U-shaped cross section of the complementary structure (1) is made up of a horizontal straight portion (11) and two respectively laterally adjoining ellipsoidal portions (12), which form the legs (3) of the U-shaped complementary structure (1).
Abstract:
An orthopedic simulator is provided with an integral central manifold that provides internal routing of pressurized hydraulic fluid, compressed air, or electrical power to the actuators of the orthopedic simulator. The integral manifold is structurally coupled to support elements and resist and transfer bending and shear forces to the support elements.
Abstract:
Die Erfindung betrifft ein Kalottenschleifgerät (1) mit zumindest einer Aufnahmeeinrichtung (10) zur Aufnahme zumindest eines Prüflings (20) und zumindest einer Schleifkugel (11), welche durch Antriebsmittel (12) in Rotation bringbar und mit einer vorgebbaren Kraft gegen den Prüfling (20) führbar ist, wobei das Kalottenschleifgerät eine Mehrzahl von Schleifkugeln (11a, 11b) aufweist, welche zeitgleich in Rotation bringbar und mit einer vorgebbaren Kraft gegen den zumindest einen Prüfling (20) führbar sind. Weiterhin betrifft die Erfindung ein Verfahren zur Bestimmung des Abriebverschleißes eines Prüflings (20), bei welchem zumindest ein Prüfling in zumindest eine Aufnahme-einrichtung (10) aufgenommen wird und zumindest eine Schleifkugel (11) mit einer vorgebbaren Kraft gegen den Prüfling (20) geführt und durch Antriebsmittel (12) in Rotation gebracht wird, um eine Kalotte in den Prüfling einzuschleifen, wobei mit einer Mehrzahl von Schleifkugeln (11) zeitgleich zumindest zwei Kalotten eingeschliffen werden.
Abstract:
A multi-sample conditioning system may include a sample chamber for each sample or a sample chamber holding one or more samples. Multiple samples enable replication for statistical analysis and individual sample chambers enable individual nutrient flow profiles for each sample. A mechanical imbalance may be created when a sample chamber is removed or when samples of different stiffness are conditioned together. The mechanical imbalance may result in an undesired alteration of the desired conditioning profile and increase the variation in the conditioning profile applied to each sample. An asymmetric-loading support assembly provides a low friction support to reduce the undesired alteration of the desired conditioning profile applied to the samples and reduce unwanted reaction loads on the conditioning drive mechanisms. The asymmetric-loading support assembly preferably includes a flexure as the low-friction, high-stiffness support. Other examples that can provide low-friction, high-stiffness support include air bearings, magnetic bearings, and hydraulic bearings.
Abstract:
An orthopedic simulator is provided with an integral central manifold that provides internal routing of pressurized hydraulic fluid, compressed air, or electrical power to the actuators of the orthopedic simulator. The integral manifold is structurally coupled to support elements and resist and transfer bending and shear forces to the support elements.
Abstract:
Die Erfindung betrifft eine Prüfvorrichtung für Rumpfschalen, wobei der Prüfling mit einer im Querschnitt U-förmigen Komplementärstruktur mit Schenkeln verbunden ist wobei an den Enden der Schenkel Längsflansche in Längsrichtung der Komplementärstruktur mit Mitteln zur Fixierung der Rumpfschale an der Komplementärstruktur sowie zur Einleitung und Aufnahme von Korrekturkräften an den Begrenzungen der Komplementärstruktur in Längsrichtung Querflansche zur Einleitung und Aufnahme von Prüfkräften in sechs Freiheitsgraden vorgesehen sind. Die Komplementärstruktur (1) ist als Weicher Kasten aus Verbundmaterialien ausgebildet und der U-förmige Querschnitt der Komplementärstruktur (1) ist aus einem horizontalen geraden Abschnitt (11) und zwei sich jeweils seitlich anschließenden ellipsoidalen Abschnitten (12), welche die Schenkel (3) der U-förmigen Komplementärstruktur (1) bilden, aufgebaut.