T/CSAE 113-2019 in English
VALIDWind noise test for full—Scale automobile in aero-acoustical wind tunnel—The measurement method of interior wind
- Issued on:2019-07-10
- Implemented on:2019-07-10
- File Format:PDF
- Delivery:Via email within 5 business days
$621.00
Introduction
Analysis of the core content of the standard
| Key elements | Technical requirements | Implementation points |
|---|---|---|
| Wind tunnel type | 3/4 opening reflow low-speed aerodynamic-acoustic wind tunnel | Must meet the flow field stability ≤ 0.5%, background noise < 60dB(A)@140km/h |
| Measuring instrument | Grade 1 accuracy acoustic equipment (dynamic range > 120dB) | Digital artificial head is recommended, and the microphone is 700±20mm away from the ear |
| Vehicle status | Curb weight without attachments | Air conditioning/wipers must be turned off, tire pressure must be in accordance with factory standards |
Technology evolution background
With the increasing requirements for automotive NVH, traditional wind tunnels can no longer meet the needs of high-frequency acoustic measurements. This standard clarifies for the first time the dual requirements of low-frequency flutter (<3% RMS) and free sound field space (ISO 3745) for aerodynamic-acoustic wind tunnels, promoting the industry's transformation from pure aerodynamic testing to acoustic-aerodynamic coupling testing.
Key measurement process
- Wind tunnel verification: complete background noise and flutter test according to Appendix A/B
- Vehicle positioning: longitudinal symmetry plane deviation ≤0.1°, front end in stable flow field
- Seat adjustment: seat back 114°±2°, headrest center and measuring point at the same height
- Data collection: ≥15 seconds sampling, sampling rate above 32kHz
Innovative evaluation system
The standard breaks through the traditional single A-weighted evaluation and establishes a four-dimensional indicator:
- Objective value: A-weighted sound pressure level (63-10kHz 1/3 octave)
- Local noise: Cumulative sound pressure difference value (Formula 1)
- Speech perception: AI index (GB/T 15485)
- Psychoacoustics: Zwicker loudness (ISO 532-1)
Implementation suggestions
1. Model car measurement: Tire pressure needs to be scaled proportionally, and the surface roughness of the hard model should be ≤1.6μm
2. Data comparison: It is recommended to use 120km/h+10° yaw angle as the benchmark condition
3. Uncertainty control: The microphone needs to be calibrated every 24 hours, and re-measurement is required if the temperature drift is >2℃
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