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1. The swing of the lateral vibration of the gantry crane is much larger than the amplitude of the elastic vibration, so the latter does not affect the former value;
2. The constant value of the static resistance of the gantry crane trolley running or turning;
3. The wheel-to-rail slip does not occur when the gantry crane is started or braked.
When the acceleration torque and braking torque are not large, the last assumption can be used. These conditions are usually established for existing walks.
Considering that the systems studied have greater rigidity, they should belong to systems with high natural frequencies. When an external force that changes with time acts on such a system, it is allowed to regard this external force as a constant when determining the maximum dynamic load. Place
In the following study, either the acceleration force or the braking force was taken as a constant.
Since the running gear and the slewing mechanism of the gantry crane may be equipped with a starting device, the mechanism may be preloaded before starting, but it may not be started without such a device, so the above two starting situations will be considered separately below.
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The gantry crane uses the following situation to analyze the shape-removing mechanism