High-strength bolt strength calculating method of wind generating set

Abstract

The invention provides a high-strength bolt strength calculating method of a wind generating set. The high-strength bolt strength calculating method provided by the invention comprises the following steps of: combining a VDI (Virtual Device Interface) 2230 standard and finite element analysis; modeling by using the finite element analysis; setting boundary conditions and obtaining stress increment of a bolt under the external loading effect by solving; and obtaining ultimate strength of the bolt after considering factors in two aspects of influence on the stress by a bolt pre-fastening force supplying manner through the VDI 2230 standard. A screw part is simulated by using a three-dimensional beam unit in a modeling process; and the stress condition is simulated by that a bolt thread part is engaged with a screw hole, and a bolt head and the screw part can be limited by multiple joints. The high-strength bolt strength calculating method is used for reasonably simulating the bolt by more completely considering a comprehensive stress condition of the bolt, can be widely applied to all high-strength bolt strength checks except a tower cylinder connection bolt in the wind generating set, and provides reliable proof for the design of the high-strength bolt.

Description

technical field [0001] The invention is applied in the technical field of wind power generation, and in particular relates to a method for calculating the strength of high-strength bolts of a wind power generating set, and is specifically applied to the calculation of the strength of connecting bolts of other large structural parts in the wind generating set except for tower connecting bolts. Background technique [0002] Bolts are important connecting components such as blades, hubs, main shafts, frames, and bearings in wind turbines. During the design process, due to inaccurate strength design, the safety of the whole machine operation cannot be guaranteed, and some accidents are prone to occur. In recent years, the failure of bolts has occurred frequently, not only because of their own processing quality problems, but also due to factors such as unreasonable design. In the previous process of bolt strength design, some were based on the VDI 2230 standard. This standard m...

AI Technical Summary

Problems solved by technology

When the structure is relatively complex, it is difficult to guarantee the accuracy of calculation using engineering algorithms to calculate the axial force and shear force on the bolts as the input conditions of the VDI 2230 standard

Some also use the finite element method to calculate the strength of the bolts, but the method of applying the bolt preload is not considered in the calculation process. In addition, when calculating the bolt strength, the bolts are often simulated by solid elements, which increases the nodes of the model virtually. and the number of units, thus increasing the computational cost

In addition, when evaluating the bolt strength, the axial stress of the bolt is mainly considered, and the normal bending stress of the bolt due to bending is not considered. In this way, the calculated bolt stress will be dangerous, and there is a certain design risk.

Images