초록 ▼

A multiaxial high cycle fatigue test system for testing bending, torsion, and tension of a test unit, comprises servo-hydraulic components, including a hydraulic service manifold, two small high frequency actuators along a first axis, and one large main actuator along a second axis The large main ac

A multiaxial high cycle fatigue test system for testing bending, torsion, and tension of a test unit, comprises servo-hydraulic components, including a hydraulic service manifold, two small high frequency actuators along a first axis, and one large main actuator along a second axis The large main actuator is used to apply a radial centrifugal force, and the two small actuators are used to apply vibratory loading; the two small side actuators being offset independently of each other, to enable the machine to apply both bending loads and torque to the test unit. The test unit is subjected to torsion loading when the traverse actuators move in phase, that is when both actuators move either in or out at the same time. The test unit is subjected to bending loading when the actuators move out-of-phase, that is one actuator moves in when the other moves out or vice-versa.

대표청구항 ▼

A multiaxial high cycle fatigue test system for testing bending, torsion, and tension of a test unit, comprises servo-hydraulic components, including a hydraulic service manifold, two small high frequency actuators along a first axis, and one large main actuator along a second axis The large main ac

A multiaxial high cycle fatigue test system for testing bending, torsion, and tension of a test unit, comprises servo-hydraulic components, including a hydraulic service manifold, two small high frequency actuators along a first axis, and one large main actuator along a second axis The large main actuator is used to apply a radial centrifugal force, and the two small actuators are used to apply vibratory loading; the two small side actuators being offset independently of each other, to enable the machine to apply both bending loads and torque to the test unit. The test unit is subjected to torsion loading when the traverse actuators move in phase, that is when both actuators move either in or out at the same time. The test unit is subjected to bending loading when the actuators move out-of-phase, that is one actuator moves in when the other moves out or vice-versa. [US_PATENT]US-4486739, 19841200, Franaszek et al.; US-4866704, 19890900, Bergman, 370/452; US-5396357, 19950300, Goossen et al., 398/059; US-5418785, 19950500, Olshansky et al., 370/438; US-5526155, 19960600, Knox et al.; US-5663724, 19970900, Westby; US-5790288, 19980800, Jager et al.; US-6023359, 20000200, Asahi; US-6049550, 20000400, Baydar et al.; US-6370579, 20020400, Partridge, 709/226; US-6466591, 20021000, See et al., 370/535; US-6493117, 20021200, Milton et al., 398/049; US-20020010694, 20020100, Navab et al., 707/001 al indication on things placed within the zone of the location of optimal heating effect from said radiant heater, and a controller configured to estimate or determine the distance to said patient from said radiant heater, and if said distance is within a predetermined range, energising said radiant heater to a specific level, said specific level being related to said location. 2. An apparatus for heating a patient as claimed in claim 1 wherein said a radiant heater comprises a heating element which when energised emits infrared radiation and an infrared reflector which focuses the radiation emitted by said radiant heater. 3. An apparatus for heating a patient as claimed in claim 2 wherein said predetermined heating zone location relates to the optimum positioning of said patient relative to said radiant heater. 4. An apparatus for heating a patient as claimed in claim 3 wherein said controller comprises: detector means juxtaposed adjacent said radiant heater and adapted to provide an output signal indicative of the distance from said detector means to said patient, wherein said controller receives said output signal and adapted to energise said radiant heater to radiate an appropriate level of radiation for said distance or, if said patient is not within a predetermined range of distances, provides an audio and/or visual alert to the user that the patient is not located within said desired range. 5. An apparatus for heating a patient as claimed in claim 4 wherein said indicator means further comprises a visual indicator of said predetermined heating zone. 6. An apparatus for heating a patient as claimed in claim 5 wherein said indicator means further comprises: a first light source attached to said radiant heater directed generally at said predetermined heating zone, and a second light source attached to said radiant heater and generally directed at said predetermined heating zone; wherein the point at which a first light beam emitted from said first light source and a second light beam emitted from said second light source converges is approximately said predetermined heating zone. 7. An apparatus for heating a patient as claimed in claim 4 wherein said detecting means includes at least one ultrasonic transducer. 8. An apparatus for heating a patient as claimed in claim 4 wherein said alert includes information about whether the said patient is too near, too far away, or optimally positioned from said radiant heater. 9. An apparatus for heating a patient as claimed in claim 4 wherein said detector means comprising: a transmitter adapted to convert a control signal to a sent ultrasonic pressure pulse; an ultrasonic receiver adapted to convert a received ultrasonic pressure pulse into a response signal; a processor adapted to: a) send a control signal to said transmitter to send at least one ultrasonic pulse, b) receive said response signal, c) estimate the distance to said patient based on the time between at least a portion of said control signal and at least a portion of said response signal. 10. An apparatus for heating a patient as claimed in claim 9 wherein said detector means further comprising at least one filtering and amplification circuit adapted to filter and amplify said response signal before being received by said processor. 11. An apparatus for heating a patient as claimed in claim 10 wherein said detector means comprising at least two said filtering and amplification circuits, whereby the multiplexed output of said at least two circuits is received by said processor, said processor selecting which of said circuits output to use based on the output voltage of each circuit. 12. An apparatus for heating a patient as claimed in claim 11 wherein the voltage output of each circuit in use being different, and said processor selecting one circuit based on its voltage output being within a predetermined range. 13. An apparatus for heating a patient as claimed in any one of claims 1 to 3 fur