AS ISO 3471:2020 pdf free.Earth-moving machinery—Roll-over protective structures—Laboratory tests and performance requirements.
Where not practicable to use the full machine frame for the physical testing of a ROPS or FOPS, a partial frame may be used. The partial frame may be fabricated, but it shall duplicate as closely as possible the strength and stiffness of the original frame.
The minimum portion of the machine frame or facsimile required shall be determined by evaluating the rigidity and strength of the machine frame to ensure that it is capable of absorbing the energy transmitted to the machine frame via the ROPS during the test without failure.
The representative specimen shall be mounted to a substantially rigid bedplate so as to have a stiffness which is at least equal to that of a complete machine frame.
An evaluation of the rigidity and strength of the machine frame shall be performed for each test where a partial frame or facsimile of a frame is used. A copy of the evaluation shall be retained by the manufacturer.
5.4.2 The representative specimen shall be secured to the bedplate so that the members connecting the assembly and bedplate experience minimal deflection during testing. The representative specimen shall not receive any support from the bedplate, other than that due to the initial attachment. The fixture arrangement shall not inhibit possible machine frame deformation in the ROPS mounting areas. The intent is that the energy be absorbed by the representative specimen and not by the fixture arrangement.
5.4.3 The test shall be conducted with any machine/ground suspension element blocked externally so that it does not contribute to the load-deflection behaviour of the test specimen. Suspension elements used to attach the ROPS to the machine frame and that act as a load path shall be in place and functional at the start of the test.
5.4.4 Frame connections to the bedplate shall be directly from the machine frame at or near the front and rear axle supports.
For articulated machines, the hinge shall be locked with no articulation if both frames are used in the evaluation. If only the frame on which the ROPS is mounted is used, the connections shall be at or near the articulation joint and axle support or at the outside end of the frame.
For single-axle prime movers, the support shall be at the drive axle.
Crawler machines shall be connected to the bedplate through the main drive housing and/or track frames.
See the examples shown in Figures 7 to 13.AS ISO 3471 pdf download.