Directivity and Damping of Race Trucks at Zandvoort
In this measurement report, ASCEE investigates the noise emissions of four race trucks at Circuit Zandvoort to ensure compliance with the 95 dB(A) standard. Power spectra and directivity were determined both while stationary (idling and at 2000 rpm) and during pass-by runs. In 6-cylinder engines, the exhaust port peak dominates at 100 Hz; the V8 two-stroke exhibits a tonal spectrum (150–250 Hz) with turbo whistle around 10 kHz. Omnidirectional measurements show that the cab reflects sound toward the rear (1–5 dB difference). Resonance dampers and directing the exhaust outlet away from Zandvoort provide effective noise reduction.
Reference to the report
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Author: Dr. J.A. (Anne) de Jong, M.S. (ASCEE)
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Document ID: 31417 (Revision 1, Final)
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Report date: April 13, 2018 (noise test date: March 28, 2018)
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Location: Zandvoort Circuit
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Onderwerp: Geluidsmetingen racetrucks, $L_{\mathrm{AF,max}}$ -vermogensspectra, directiviteit en resonantiedemping
