In this paper, we introduce a new test method for friction performance of wind turbine pitch bearing. Four loading devices are used to put on load on the pitch bearing from different directions through load board. It can accurately simulate the axial force, radial force and overturning moment of wind turbine pitch bearing. The data acquisition device can measure the value of speed, torque and actual output load of loading hydraulic cylinder. After analysis and calculation, the influence of additional friction torque produced by loading device can be obviated, the friction torque of wind turbine pitch bearing under different loads can be test accurately in the laboratory. The research shows that the structure of test bed is compact, mechanical rigidity is good, the replacement of bearing model is expedient. It puts on load easily and can measure the frictional torque of wind turbine pitch bearing under different loads more accurately. It can provide data for performance analysis of wind turbine pitch bearing and ensure the pitch bearing satisfying the application requirements.
This article use Automation Studio simulation software to make analysis on rib tube welding machine hydraulic system.Briefly introduces the software, theoretically analye welding machine hydraulic system, using software to make a detailed analysis on push (pull) acting hydraulic cylinder to push and pull two movements operation By analyzing the stable running speed, equal in size and opposite in direction which is consistent with reality step process.
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