Calculating method for fatigue life checking of fan welding parts
A technology of fatigue life and calculation method, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of fatigue safety of fan welding parts, and achieve the effect of accurate results, small calculation amount, and simple and easy calculation process
Inactive Publication Date: 2015-03-11
CHINA CREATIVE WIND ENERGY +3
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Problems solved by technology
Due to the complex structure of welded parts, it is difficult to check and calculate the fatigue life of welded parts with engineering algorithms. Here, a general finite element calculation method is proposed to check the fatigue life of fan welded parts and solve the fatigue safety problem of fan welded parts.
Method used
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Embodiment
[0022] Embodiment: This example is for checking and calculating the fatigue life of a certain MW-level wind turbine shroud support structure. The specific steps are as follows:
[0023] The first step: establish the phantom model of the fan weldment to set the boundary conditions; this example is to establish the front and rear shroud support structure and the shroud dummy model, in order to apply the boundary conditions, the shroud dummy structure needs to be established, The whole structure is as figure 2 shown;
[0024] Step 2: Carry out finite element meshing for the geometric model of the phantom structure of the fan weldment, and list the unit types of each connecting part; See Table 1 for details on the unit setting of the connecting parts. The finite element model of the whole mechanism is as follows: image 3 Shown:
[0025] Table 1
[0026] model part unit type unit type key option Front shroud bracket Solid185 3D Solid Element none ...
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The invention discloses a calculating method for fatigue life checking of fan welding parts, belonging to the technical field of wind power generation. The calculating method comprises the following steps of: applying gravitational load to determine boundary conditions by establishing a fan welding part implant model; calculating by adopting finite element software to obtain integral structural stress and displacement boundary condition information; determining the stress maximum point of each connecting part as a model dangerous node, and obtaining the dangerous point stress sigma of the integral structure; and calculating the service lives of the fan welding parts. The calculating method disclosed by the invention can be used for performing fatigue life checking on all welding parts of the fan, and is very wide in applicability. The calculating method is simple and easy in calculating process, small in calculating amount, relatively accurate in result and convenient to implement.
Description
technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a calculation method for checking the fatigue life of fan welding parts, which is a more general method for checking the fatigue life of fan welding parts, and can be widely used in the fatigue life of fan welding parts of various structures proofreading. Background technique [0002] Due to the advantages of various structural forms, relatively simple procedures and low processing costs, welded structural parts are more and more used in megawatt wind turbines. For example, various bracket structures in wind turbines, including the shroud bracket, nacelle cover bracket, electrical cabinet bracket and other components are all in the form of welded structures; at the same time, more and more welded fan chassis are used. However, due to the heat-affected zone and the easy formation of stress concentration in the weldment, the fatigue performance of the wel...
Claims
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IPC IPC(8): G06F17/50
Inventor 栗荫帅
Owner CHINA CREATIVE WIND ENERGY