ISO 15230-1:2021

Overview

ISO 15230-1:2021 - "Mechanical vibration and shock - Coupling forces at the man‑machine interface for hand‑transmitted vibration - Part 1: Measurement and evaluation" - defines how to measure and report the mechanical coupling between an operator’s hands and a vibrating machine surface. The standard describes force and pressure parameters (push/pull, grip, guiding, lifting, feed, contact forces, contact pressure) and provides procedures and guidance for measurement, instrumentation and calibration. It focuses on quasi‑static coupling forces (frequencies < 5 Hz) and excludes forces acting tangentially to the hand.

Key topics and technical requirements

• Coupling parameters: Clear definitions for force parameters (push/pull, gripping, guiding, lifting, feed) and pressure parameters (local, mean, maximum local pressure).
• Measurement formulas: Methods to compute elemental contact force, mean pressure and maximum local pressure based on surface elements and local pressures.
• Biodynamic considerations: Discussion of biodynamic forces that arise from the hand‑arm system response to vibration (informative).
• Annex guidance:
  • Annex A: Biodynamic effects on contact forces
  • Annex B: Calculation methods to derive gripping and push/pull forces from pressure measurements
  • Annex C: Recommended measuring procedures and result processing
  • Annex D: Recommended parameters for measuring instrumentation
  • Annex E: Calibration and reference methods
• Instrumentation & calibration: Requirements and a calibration method are provided to ensure repeatable, reliable measurements.
• Practical limits: Example guidance on local pressure ranges (typical local pressures often fall between 0 and 0.8 N/mm²; higher values may be painful).

Practical applications

• Assessing hand‑transmitted vibration exposure in occupational hygiene and ergonomics studies.
• Supporting laboratory research and epidemiological reporting where coupling forces modify vibration transmission to the hand‑arm system.
• Guiding tool and handle design to reduce harmful coupling and optimize grip/posture.
• Specifying measurement protocols for calibration labs, instrument manufacturers and test houses performing vibration coupling assessments.
• Informing occupational safety evaluations and control measures that account for how coupling affects vibration dose and injury risk.

Who should use this standard

• Ergonomists, occupational hygienists and safety professionals
• Researchers studying hand‑arm vibration and biodynamic responses
• Test laboratories and instrumentation manufacturers
• Product designers of hand‑held and hand‑guided machinery

Related standards

• ISO/TR 15230-2 - Guidance on evaluating coupling forces and their effect on vibration exposure (technical report, complements Part 1).
• ISO 8727 - Referenced for forearm‑based coordinate conventions used in grip definitions.

Keywords: ISO 15230-1, hand‑transmitted vibration, coupling forces, gripping force, push pull force, pressure exerted on skin, measurement and evaluation, man‑machine interface, vibration exposure, calibration.