| In the wind turbine,the blade mainly converts the wind energy into the flexible body of mechanical energy,and the vibration occurs when the wind loads,and the blade laying mode influences the structure.Therefore,it is important to study the relationship between the paving mode and the modal relations.300W wind turbine blades are made of camphor pine and covered with 3 layers of glass fiber.The use of SDJF-30KN type electronic universal testing machine,with the blade was camphor pine compression experiment in longitudinal direction and transverse direction,the longitudinal direction of fracture strength 7.32kN,fracture strength 11.8MPa,transverse direction fracture strength 0.38kN,tensile strength of 3.3MPa:The surface hardness test and tensile test of 3 glass fiber reinforced composites were carried out using HV-1000TM and SDJF-30KN electronic universal testing machine respectively.The surface hardness HD was 13,the breaking force was 1.7kN,and the fracture strength was 6.4MPa.Experimental modal analysis of PULSE Reflex system using the Danish company under the B&k layer,this leaves approximately as a cantilever beam,with hammering method,the acceleration sensor and the force sensor with software to collect and analyze the signals required to get the natural frequency.vibration mode and damping ratio.The experimental results show that the 1 order natural frequencies of wood core blade 23.30Hz,1 order damping ratio 5.29%and vibration mode are compared with the rotation frequency 20.01 Hz of wood core blade,and it is found that the resonance probability of this wood core blade is larger.In addition to the North China Electric Power University wind tunnel laboratory tested 300W power characteristics of wind turbine,wind turbine start-up wind speed at about 4.5m/s,when the wind speed reaches 6.2m/s wind turbine rated power.Compared with the design wind speed 8 m/s below the 1.7 m/s,the wind turbines in the wind tunnel wall effect is bigger,can't reflect the real phenomenon... |
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