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Acoustic excitation

Making noise is not difficult.

Making a very high level of noise from a small source is a challenge. Close approximation of point source or monopole radiation is the next challenge.
Providing a signal of the exact output of the airborne source in real time is another level of challenge.

Qsources has developed several patented solutions for measurement sound sources.

The Qohm, Qoms2, Qmed, Qmhf, Qind2, Qlmf are products for measurements on airborne isolation for vehicles, aircraft, coaches, and buildings. Each with different characteristics.

For accurate acoustic transfer measurements and vibro-acoustic transfer measurements the Qmhf, Qmed, Qind2, Qimf are most suited,because of the real time volume acceleration signal.

For on-site sound power identification and test-site calibration, we have the Qref and Qmir reference sound power sources.

Qind2 – Low frequency miniature source

The Low Frequency Miniature Source has been developed to perform highly repeatable, low frequency acoustic excitation in a minimum of space.

Qmed – Low frequency monopole source

The Simcenter Qsources hardware low frequency monopole source has been designed to measure vibro-acoustic transfer functions in and around vehicles. The sound source level in combination with the frequency range makes this source a versatile measurement device designed to meet the needs of noise, vibration and harshness (NVH) research and development departments.

Qlmf – Low-/Mid-frequency volume source

The Simcenter Qsources hardware lowmid frequency source is used for producing high noise levels, more than sufficient for the excitation of complete vehicles. The integrated volume acceleration sensor gives realtime feedback of the emitted source strength and can be used as a reference for frequency response functions (FRFs) measurements without any postprocessing.

Qmhf – Mid-/High-frequency volume source

The Simcenter Qsources hardware midhigh frequency source is a general use monopole volume acceleration source with internal reference sensors to measure mid- and high-frequency frequency response functions (FRFs). Automotive original equipment manufacturers (OEMs) use these acoustic monopole sources for dedicated investigations, such as transfer path analysis (TPA), airborne source quantification (ASQ) and other noise, vibration and harshness (NVH) related measurements and analyses. These sources are also to used by full vehicle NVH departments for validation of the high-frequency sound package of a vehicle body.

Qohm – Extreme lightweight, high power dodecahedron sound source

The highly uniform sound radiation from the Qohm source allows controlled excitation of the acoustics of small and large sites, such as classical theaters, factory halls, schools, offices, apartments and machinery rooms. Thanks to the omni-directionallity of the sound source, as specified in ISO 16283, only a few measurement locations are needed in each space for typical airborne isolation and reverberation testing.

Qoms2 – Monopole omni-directional sound source

Qoms2 is a next level monopole point source for broadband measurements with high accuracy. Measurements such as room impulse responses, Speech Transmission Index (STI) and reverberation time allow consultants to optimize the acoustics of performance sites such as theaters,schools or religious sites for speech and music.

Qref – Monopole sound power reference source

Sound power reference sources are the calibrators for the acoustics of spaces whilst they are used to determine sound power identification. Qref is a unique sound source for regular verification of acoustic rooms for product testing, machinery testing, anechoic rooms, reverberant rooms. Another main application for this product is sound power identification on-site of for example installed machinery or larger installations.

Qmir – Unique sound power reference point source

The Qmir is a very compact power reference monopole source with high acoustic impedance. The small size of the Qsources Qmir make it especially suitable as a reference for large-count antenna measurements. Beside the standardized sound power reference applications, the compact size and frequency range make this source attractive for airborne power insertion in spaces or enclosed volumes for Statistical Energy Analysis (SEA).”

Qamp – Measurement amplifier (230V & 115V version available)

The Simcenter Qsources hardware measurement amplifier has been designed to power all Simcenter Qsources structural and acoustic exciters.

Qam – Fully DSP Controlled sound power amplifier

Qam is suitable for noise and vibration measurements with a very high power/ weight ratio for maximum portability and a straightforward, easy to use button operation. It includes an internal white/pink noise signal generator.