Overview
ISO 22138:2022 - Heavy commercial vehicles: Vehicle stability during tipper body operation - Tilt-table test method specifies a laboratory test to estimate lateral stability of tipper (dump) vehicles during tipping operations. The method uses a tilt-table test to determine the rollover threshold as a function of tipper body inclination, producing a stability envelope (limit curve) that characterizes when wheel lift and loss of stable roll equilibrium occur. The standard applies to heavy commercial vehicles and combinations defined in ISO 3833 (vehicle categories N2, N3, O3, O4) - i.e., trucks and trailers with maximum weight above 3.5 tonnes - and covers both rearward (pitch) and sideways (roll) tipping configurations. The stability envelope is also noted as applicable to autonomous construction vehicles.
Key technical topics and requirements
- Test principle: quasi-static roll-plane simulation on a tilt table where roll moment is increased by tilting until critical wheel lift occurs.
- Scope of tests: repeated tests at multiple tipper body pitch or roll angles to generate the rollover threshold envelope.
- Variables and definitions: tipper body pitch/roll, chassis frame pitch/roll, global and road-plane angles, critical tilt angle, critical wheel lift, trip rail, tilt axis.
- Test preparation: vehicle condition requirements, unladen weight measurement, defined loading procedures, axle load redistribution measurements due to tipper body motion.
- Tilt-table properties and equipment: contiguous or coplanar supports for tyres, tilt axis orientation, trip rail specification, measuring equipment and sensors.
- Test execution: installation on the tilt table, procedural steps for rearward and sideways tipping tests, safety restraints to prevent full rollover.
- Data evaluation: methods to derive characteristic values and present the limit curve; annexes provide a test-report format and example reports.
- Normative references: ISO 8855, ISO 15037-2, ISO 16333 and ISO 3833 are referenced for terminology, heavy-vehicle test conditions and related tilt-table methods.
Practical applications and who uses it
- Vehicle manufacturers and designers: validate chassis, suspension, subframe and tipper-body designs for lateral stability during dump operations.
- Test laboratories and certification bodies: perform standardized tilt-table tests for safety assessment, compliance checks and type-approval evidence.
- Fleet operators and safety engineers: assess operational tipping limits, update safe-work procedures and training for tipper operations.
- Vehicle dynamics modellers and R&D teams: validate simulation models of rollover behaviour and payload redistribution effects.
- Autonomous vehicle integrators: apply the stability envelope to autonomous construction vehicles for safe operational envelopes.
Related standards
- ISO 16333:2011 - Steady-state rollover threshold - Tilt-table test method
- ISO 15037-2 - General conditions for heavy vehicle dynamics tests
- ISO 8855 - Vehicle dynamics vocabulary
- ISO 3833 - Vehicle categories and definitions
Keywords: ISO 22138:2022, tilt-table test, tipper vehicle stability, rollover threshold, heavy commercial vehicles, lateral stability, tipper body, rearward tipping, sideways tipping.