Structural-Borne Noise (SBN) & Airborne Noise (ABN) Testing for Defense Equipment – MIL & ISO Standards

 Introduction:

In defense platforms such as submarines, ships, aircraft, and land vehicles, noise and vibration directly affect stealth, communication, and crew comfort. Excessive structural-borne or airborne noise can compromise operational effectiveness and even risk detection in naval operations.

To prevent this, defense projects mandate SBN & ABN testing as per MIL-STD-740, MIL-STD-1474, ISO 10816, and ISO 3744.

This blog explains what SBN & ABN testing means, why it’s important, and how Indian defense suppliers can achieve compliance.

1️⃣ What is Structural-Borne Noise (SBN)?

  • Noise generated by mechanical vibrations transmitted through the structure of equipment (e.g., pumps, motors, gear systems).

  • Measured as vibration levels that propagate through structural paths.

  • Critical in submarines and naval vessels, where vibration must be minimized for stealth.

2️⃣ What is Airborne Noise (ABN)?

  • Noise radiated directly into the air from equipment.

  • Measured in sound pressure levels (SPL) in dB.

  • Important for ensuring crew comfort, communication clarity, and mission stealth.

3️⃣ Key Standards for Noise Testing

  • MIL-STD-740-2 – Structure-Borne Vibratory Acceleration Measurement.

  • MIL-STD-1474 – Noise Limits for Military Systems.

  • ISO 10816 – Mechanical Vibration Evaluation.

  • ISO 3744 – Determination of Sound Power Levels.

4️⃣ Why SBN & ABN Testing Matters for Defense

  • Stealth & Survivability – Low vibration and noise reduce detectability.

  • Equipment Reliability – Identifies mechanical resonance and fatigue risks.

  • Crew Safety & Comfort – Controls harmful noise exposure levels.

  • Defense Qualification – Mandatory for Navy, Army, and Air Force projects.

5️⃣ Challenges Faced by Indian Defense Suppliers

  • Specialized sensors and test setups required (accelerometers, microphones, analyzers).

  • Limited availability of accredited test facilities.

  • Complex data analysis and compliance reporting.

6️⃣ How EMCTS Can Help

At Electromagnetic Center for Testing & Solutions (EMCTS), we provide expert support in SBN & ABN testing:

  • Pre-test Setup Guidance – Ensure correct sensor mounting and equipment operation.

  • Testing Support – Work with NABL / Govt accredited labs.

  • Noise Data Analysis – Interpretation of vibration & acoustic results.

  • Compliance Reports – Structured documentation as per MIL & ISO standards.

👉 Contact us at info@emcts.in to discuss your SBN & ABN testing requirements.

Location: India

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