Quality inspection of heat shields

Acoustic quality control

Acoustic quality control is used to inspect heat shields for quality and production defects. This takes advantage of the property of a test object to be set into vibration when excited externally, with the resulting resonance frequencies evaluated using an air sound sensor. The excitation of the test object is carried out via magnetic stimulation using the dsound® USE01 Exciter, and the recording and evaluation of the generated sound is performed using the dsound® USS4-LS airborne sound sensor.

The heat shields are subjected to quality inspection and magnetically excited by the dsound® USE01 Exciter (ferromagnetic material). This sets the component into vibration, producing resonance frequencies, which are evaluated by the connected dsound® USS4-LS airborne sound sensor according to predefined training data. The dsound® USS4-LS airborne sound sensor is synchronized with the dsound® USE01 Exciter and can perform the sound evaluation simultaneously with the excitation. The result of the sound recognition can be output via a digital output for further use.

The entire sound analysis is performed entirely on the sound sensor itself, so no additional equipment is required for quality inspection. This method of quality control allows manufacturing defects, such as missing internal lining or material faults, to be detected.

Acoustic quality testing on heat shields