FRACTAL PREDICTION OF FRICTIONAL FORCE AGAINST INTERIOR SURFACE OF FORMING CHANNEL IN BIOMASS RING DIE PELLET MACHINE

De Xuehong; Yang Yang; Jin Min; Li Nanding; Guo Wenbin; Li Zhen

doi:10.19912/j.0254-0096.tynxb.2021-0067

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (9) : 369-375. DOI: 10.19912/j.0254-0096.tynxb.2021-0067

FRACTAL PREDICTION OF FRICTIONAL FORCE AGAINST INTERIOR SURFACE OF FORMING CHANNEL IN BIOMASS RING DIE PELLET MACHINE

De Xuehong¹, Yang Yang¹, Jin Min¹, Li Nanding¹, Guo Wenbin¹, Li Zhen²

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Abstract

In this study, two samples of ring die forming channel were used to measure and obtain data of their surface morphology with roughness meter, and then the fractal dimension D and fractal feature G were calculated using Yardstick method, and lastly a fractal prediction model of sliding frictional force against the interior surface of forming channel was built based on classical contact mechanics and M-B fractal model. Numerical simulation as well as friction-wear test was conducted to verify the accuracy of the model. The result showed that： When interior surface roughness R_a of forming channel is 3.428 μm （45#）,D is 1.373 and G is 1.55×10^-6 m. When R_a is 4.002 μm （40Cr）, D is 1.359 and G is 0.82×10^-6 m. Along with the increasing A_r, F increased while F_D decreased. When _r<A_rc, the slope of F was larger, which means the frictional force increased more rapidly, and the larger slope of F_D represents rapidly decreasing unit frictional force. When A_r>A_rc, F became smaller, which means the increase of frictional force became slower, and the smaller slope of F_Drepresents slower decrease of unit frictional force. The experiment data verified that the simulation value is larger than the test value, with the increase of true contact area, the simulation value of frictional force F approximates test value, therefore an overall good simulation result could be achieved by the fractal prediction model of frictional force.

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biomass pelleting / frictional force / prediction / fractal / forming channel

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De Xuehong, Yang Yang, Jin Min, Li Nanding, Guo Wenbin, Li Zhen. FRACTAL PREDICTION OF FRICTIONAL FORCE AGAINST INTERIOR SURFACE OF FORMING CHANNEL IN BIOMASS RING DIE PELLET MACHINE[J]. Acta Energiae Solaris Sinica. 2022, 43(9): 369-375 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0067

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