Overview
ISO 14131:2005 - Agricultural sprayers - Boom steadiness - Test methods - defines standardized procedures to measure and evaluate boom steadiness and suspension behaviour in agricultural field-crop sprayers. The standard specifies test conditions, measurement requirements and reporting formats for three test categories: field tests, track tests and simulator tests. The aim is to quantify boom movements (vertical and horizontal displacement, velocity and acceleration) so manufacturers, test houses and researchers can assess boom stability and suspension quality.
Key topics and requirements
- Test categories: field (real operating conditions), track (reproducible bumps/holes) and simulator (controlled excitations).
- Measurement parameters:
- Measure vertical displacement and horizontal displacement relative to the boom balance position or boom centre.
- Frequency range typically measured: 0.1 Hz to 5 Hz (simulator inputs often 0.1–3 Hz).
- Minimum sample rate: 10 Hz for field/track; simulator tests require ~10 points per period (e.g., 3 Hz → ~30 samples/s).
- Displacement accuracy (field/track): 0.1 cm per 1 m of boom length; simulator minimum accuracy 2 mm.
- Procedures and repetitions:
- Field tests: at least 5 runs (10 common); wind speed measured at 2 m must be ≤ 5 m/s (if >4 m/s, run crosswind).
- Track tests: at least 3 runs; predefined track length and bump flagging required.
- Simulator tests: at least 3 runs, defined sine or random inputs with specified amplitudes.
- Measurement points: minimum of boom centre and boom tip, preferably each boom section end. Record tyre specs, wheelbase, boom geometry (see Annex A) and other test conditions.
- Reporting: provide averaged results, displacement curves, peak-to-peak amplitudes, percentage of time within bandwidth, velocities, and frequency response functions for simulator tests.
Applications
ISO 14131:2005 is used to:
- Validate and compare boom stability across sprayer models and suspension designs.
- Support product development (design of boom suspension, roll/stabilizer systems).
- Provide reproducible test methods for certification, performance claims and R&D.
- Inform calibration and on-field setup procedures to improve spray uniformity and reduce drift.
Who should use this standard
- Agricultural sprayer manufacturers and design engineers
- Test laboratories and certification bodies
- Agricultural machinery researchers and universities
- Farm equipment service engineers and consultants
Related standards
- ISO 5008 (referenced for track specifications and whole-body vibration measurement methods)
- ISO 4254-6 (safety requirements for agricultural sprayers)
Keywords: ISO 14131:2005, boom steadiness, agricultural sprayers, test methods, boom stability, boom suspension, displacement, field tests, track tests, simulator tests.
