Qsources QindW is a Wind tunnel reference sound source. A custom miniature sound source part of Infra-Qsources built for TU Delft Aeroacoustics & Wind Energy Research Group.

QindW is a custom miniature sound source with very low diffraction and excellent omni-directionality. A narrow and long design allows minimal impact on the flow and minimal feedback from the flow on the source output.

With a diameter of 22 mm and a length of 120 mm the disturbance is minimal and much smaller than any other sound source. The frequency range with a long-time stable relation between
drive voltage and emitted sound power is 500 – 6300 Hz. The set includes a powering cable with source protection electronics. The sound source can be driven with any signal from random noise to sine sweeps to music signals and can be calibrated for the sound power under different signal settings in an anechoic chamber.

Improved aeroacoustic measurements

The test has lead to significant improvements of noise measurements in closed wind tunnels using Qsources’ QindW source to generate noise in-situ, placing it in the center of the test section to study the effect of reflections. The Sound source incorporates two long stroke electrodynamic actuators. The test set-up included flow-off and flow-on measurements.

QindW is a customized product part of the Infra-Qsources range of high quality sound sources. The Infra-Qsources range includes solutions for efficient on-site acoustic testing in buildings, rooms and infrastructure.

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Where the QindW is a custom product built by Qsources for TU Delft, another miniature sound source named Q-IND, is available under the Simcenter Qsources range. Specific for the Simcenter Qsources Q-IND are the sensors for a real-time volume displacement signal up to 2000Hz. This is the source strength descriptor which is practically independent from the acoustic environment, providing a basis for reciprocity and modal analysis testing.

The Simcenter Qsources Miniature Volume Source can be used for Airborne Source Quantification (ASQ), Transfer Path Analysis (TPA) as well as Vibro-Acoustic Modal Analysis (EMA). Its miniature size allows accurate acoustic transfer function measurements around intake and exhaust nozzles for airborne source quantification techniques. The FRFs are acquired without the influence of the volume of a large low mid frequency source. Its size makes it ideal to excite structures from inside, like white goods and consumer electronics.
Besides ASQ, the source can be used for scaled modal analysis using the internal volume displacement sensor as reference.”