Experimental inversion analysis of air interior frictional power and support frictional coefficient of arm type centrifuge
In order to increase the estimation accuracy of the drive power of an arm type centrifuge,the determination method of the parameters which are the ratio C1 of the air interior frictional power to the whole aerodynamic power,the ratio C2 of the natural exhaust air speed to the air circumferential speed at the same place,and the support friction factor fe in the engineering analytical computation were researched.At first,for four steady running states of an arm type centrifuge at different rotation velocity,four set data of the armature voltage U and armature current I were fetched from the centrifuge control system,and four datum of the natural exhaust air speed V0 was experimentally measured by using the three-cup meter method.Then,according to the analytical theoretical expressions of wind resistance power,exhaust air power and support friction power of the centrifuge,as well as the principle of conservation of energy,the equation about variables U,I and V0,and with coefficients to be determined C1,C2,fe1 and fe2 was developed,and the equations system to solve the coefficients C1,C2,fe1 and fe2 were given by substituting the four sets of experimentally measured data of U,I and V0 into the previous equation.Finally,the drive power of another similar arm type centrifuge was theoretically computed by using the determined C1,C2,fe1 and fe2 values.The research result shows that the drive power is 2.23%bigger than the experimental one,while the previous theoretical result by determining the C1,C2,fe1 and fe2 values according to experience is 6.30%bigger than the experimental one.The comprehensive analysis to the application examples shows that the presented method makes up the previous shortage of experimental basis and increases the accuracy of C1,C2,fe1 and fe2,therefore increases the accuracy of the calculated drive power.
arm type centrifugegeotechnical centrifugewind resistance powerair interior frictionsupport friction powerexperimental inversionprerequisite parameter
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NSTL
万方数据
维普
