Measuring Haptics of Automotive Switches, Levers and Knobs

Automobile switches, levers and multi-function knobs are expected to operate with precision, while meeting precisely defined haptics and acoustics requirements. A joint development by Zwick and Konrad Technologies provides a cost-effective solution for the measurement of these values.

Heavy demands are placed on automobile switches, levers and multi-function knobs - and on the measuring instruments used to test their operation. Working with Konrad Technologies (Radolfzell, Germany), Zwick has developed a solution for measuring acoustics and haptics which offers manufacturers and OEM customers a cost-effective way of optimizing their products and their customers' driving comfort.

Measuring acoustics and haptics on a automobile multi-function knob.

The customer's testing requirements were clearly defined: torque up to 2 Nm, axial forces up to 20 N, haptic data recording at 10 kHz and maximum possible reduction of the mass moment of inertia in test fixtures. A frequency spectrum of 20 Hz to 20 kHz was specified for acoustics measurement. A zwicki-Line testing machine (Fmax 2.5 kN) with integrated torsion drive (Mmax 2 Nm) was fitted with special specimen grips for haptics measurement. In addition, a device was provided for clamping various controls, allowing different angle settings and alignment with regard to the test axis.

Throughout the test, audio signals are recorded in synchronization with force, travel, torque and angle signals, while the entire test procedure is recorded simultaneously on
camera (up to 1500 frames/s). User-friendly software provides numerous analysis functions, full and one-third octave analysis and psychoacoustics, for example, as well as tests on limit values of force, torque and audio signals. In addition, switch positions can optionally be measured exactly with synchronous logging of digital signals via CAN and LIN bus. Data can be exported via, for example, Excel or NI DIAdem.

This powerful new solution, developed by Zwick and Konrad Technologies, provides users with a turnkey system which can be used both in the laboratory and for product qualification, or integrated into end-of-line production tests.

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