High-precision measurement system for small test objects
Combining a frictionless rotatory air bearing with a fast and highly accurate positioning mechanism, Resonic K allows reliable high-precision measurements of complete mass properties in less than one hour.
The test object is attached to a carrier which is then placed by hand on the air bearing in up to 24 different positions. For each position, the free oscillation frequency is measured by the software.
Human errors during the positioning are a major problem of conventional mass property pendulums, but Resonic K prevents these errors with three safety layers:
• The positioning is automatic and requires no manual skills: three balls on the carrier side slide into three grooves on the air bearing under the force of gravity.
• Using redundant colour codes, numbers, and pictures, the software defines the pairs of grooves and balls in an unmistakable way.
• Even if the operator made a mistake in following the software's instruction, an incorrect placement will be identified by the software after the measurement.
Thanks to the special design, there is no limit for the horizontal dimensions of the test object. But since the test object must be lifted by hand, a weight limit of 25 kg is recommended.
Examples for suitable test objects include flywheels, rims, crankshafts, rotary compressors, vehicle doors, small drones and satellites, small ship models, hand tools, robotic tools or golf club heads.
Resonic K is composed of a rotatory air bearing with a vertical axis and a carrier for the test object. The bearing is constrained by two coil springs and has three v-grooves on its top. One of the two coil springs is mounted to a force sensor that is used to measure the pendulum’s natural frequency.
The carrier has twelve ball studs on its surface which lock into the v-grooves in different combinations of three. This allows 24 well-defined positions of the carrier. To maximize the measurement range, Resonic K can have multiple carriers varying in size.
Step 1 The test object is connected with the carrier.
Step 2 The Resonic software defines three ball studs which will be used to position the carrier into the grooves.
Step 3 The test object is set into free vibration by a manual push.
Step 4 The Resonic software measures the signals of free vibration for a predefined period of time.
Step 5 Depending on the selected program, steps 2-4 are repeated for 3 to 24 different positions.
Step 6 The software computes the mass properties of the test object.