摘要:
An electric linear displacement motor for use in a testing apparatus includes a stator assembly having a stator housing and a plurality of coils within the stator housing. An armature is positioned within the stator housing and includes a plurality of magnets along a length of the armature. A bearing assembly is attached to the first end of the stator housing and includes a bearing housing containing a bearing. A first end portion of the armature engages and is carried by the bearing. A brake assembly is coupled to the first end of the armature and the bearing housing. The brake assembly includes a moving portion coupled to the armature and a non-moving portion coupled to the bearing housing wherein the moving portion has less mass than the non-moving portion and therefore reduces the moving mass of the armature.
摘要:
A test system configured to impart a body disturbance to a test specimen and measure motion or displacement of the test specimen in response to the input body disturbance. The system includes one or more actuator devices configured to replicate motion or displacement of the body imparted through the original input body disturbance utilizing the measured motion or displacement. As disclosed, the system includes algorithms or instructions to generate control parameters utilizing the measured motion or displacement to control operation of the one or more actuator devices. The force applied through the one or more actuator devices to replicate the measured motion or displacement is used to determine the force or load applied to the body via the input disturbance.
摘要:
A servo actuator system and method of operating the same includes a dual acting actuator comprising an actuator body and a movable member movable in the actuator body to define a first and second chamber on each side of the movable member. A first port is fluidly coupled to the first chamber and a second port is fluidly coupled to the second chamber. A fluid pump having a return is provided. A proportional valve assembly is fluidly coupled to the fluid pump, return and the first and second ports. The proportional valve assembly includes a plurality of metering orifices. A controller is operably coupled to the proportional valve assembly to control the plurality of metering orifices to generate a load vector having magnitude and direction and wherein an actual position of a movable member in an actuator body is indeterminate.
摘要:
A roadway system for a vehicle and a method for testing a vehicle on a roadway system are provided. The roadway system and/or method include a platform having at least one movable endless belt configured to support a vehicle. A sensor assembly is configured to provide an output signal indicative of position, displacement, velocity and/or acceleration of the vehicle on the belt with respect to at least one reference axis. An autopilot system is configured to operate a component of the vehicle to control the vehicle on the belt with respect to the reference axis based on the output signal.
摘要:
A testing apparatus includes a crosshead and a head assembly. The head assembly includes a head cover having an interior volume. An electric actuator, controls and other electric components are located within the interior volume, wherein the motor, controls and other electric components generates heat when energized. A divider within the interior volume separates a first volume from a second volume. The first volume includes the heat generating electric motor, controls and electric components and the second volume contains substantially no heat generating components. The head assembly includes at least one fan within the second volume that draws cool air from outside the head cover and forces the cool air through the second volume and into the first volume to remove heat.
摘要:
A transducer senses repetitive pulses on a magnetostrictive element and provides transducer output bursts. A transducer circuit detects the transducer output bursts. An energy storage device couples to a power input of the transducer circuit. A switching power supply couples to the energy storage device and has repetitive suppressed states during which switching in the switching power supply is suppressed. A sequence circuit provides synchronization of the repetitive suppressed states of the switching power supply with the transducer output bursts.
摘要:
An orthopedic simulator is provided with a mechanism with a plurality of sub-mechanisms that generate relative motions between the portions of orthopedic devices, such as spinal disc implants. The sub-mechanisms are configured to be nested so as to place the sub-mechanism with the highest required performance closest to the specimen.
摘要:
A multiple degree of freedom displacement transducer and body thereof is used to measure linear displacements along and/or rotational or pivotal displacements about up to three orthogonal axes. In one embodiment, a displacement transducer body includes a first pivoting assembly and a second pivoting assembly. Each pivoting assembly has a support member pivotable relative to another portion about two orthogonal axes. A structure joins said another portion of each pivoting assembly together. In another embodiment, a displacement transducer includes a first support member, a second support member, and a cross flexure assembly joining the first support member to the second support member. The cross flexure assembly is arranged to allow the first support member to pivot relative to the second support member about two intersecting orthogonal axes. An angular sensing device is arranged to provide an output signal related to angular movement of the first support member relative to the second support member about at least one of the orthogonal axes.
摘要:
The present disclosure is directed to a platform balance that is suitable for transmitting forces and moments in a plurality of directions. The platform balance is adapted to support a test specimen, such as a large vehicle, in a test environment such as a wind tunnel. The platform balance includes a frame support and at least three spaced-apart transducers coupled to the frame support. Each of the transducers is sensitive about two orthogonal sensed axes. The transducers cooperate to provide signals indicative of forces and moments with respect to at least two orthogonal axes. Each transducer includes a transducer body having a support coupled to a sensor body along an axis of compliance. The sensor body is adapted to deflect about the two orthogonal sensed axes where the sensed axes are mutually orthogonal to the axis of compliance.