SPMT double longitudinal train plate's transport stability and capacity - part 02

Factors affecting driving stability of modular heavy load transporter

Since the goods have been firmly tied up with the vehicle body during operation, when the SPMT vehicle cargo system is subject to lateral instability due to external factors, the vehicle cargo system takes the longitudinal axis of the trailer suspension swing arm as the rollover fulcrum. Therefore, the center of gravity in stability analysis should be the combined center of gravity of vehicle and cargo. The included angle between the connecting line between the combined gravity center of the vehicle cargo system and the longitudinal axis of the suspension swing arm and the vertical line is the static stability angle. The larger the static stability angle is, the better the transportation stability is.

The height h of the center of gravity is the main factor affecting the driving stability of the vehicle cargo system. The lower the height of the center of gravity of the vehicle cargo system, the better the transportation stability. At the same time, the height of the carriage plate changes in the form process. The greater the height of the carriage plate, the worse the transportation stability. When checking the transportation stability of Double Longitudinal train slab, it is conservative to analyze the transportation stability when the slab height is the highest.

Criteria for determining whether modular heavy load transporter meet requirements

There is an upper limit on the load that each axis of SPMT can bear. For the solid tire SPMT plate produced by Germany Sauer company, each axis can bear a maximum load of 48T.
At the same time, the maximum support hydraulic pressure difference between different groups shall not exceed 50bar, that is, the maximum difference of axial load between different groups shall not exceed 9t.
At the same time, the reaction force P1 and P2 of the ground to the tire shall be greater than 0t.
This is because if one of the parameters is equal to 0, it means that at this time, only two groups in the plate bear the load, and the two-point support is unstable, and the plate must be inclined longitudinally.
According to this, the criteria for determining whether the lifting capacity of the vehicle plate meets the requirements can be obtained, in which μ Is the safety factor, which is taken as 0.7 here.