matlab知道y求x问题n=600:10:4000;CDA=2.77; f=0.013;m=3880;g=9.8; Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1000).^4; h=0.85;%机械效率 r=0.367;i0=5.83; ig=0.793;ua=0.377*r.*n/(i0*ig); Ft=Tq*ig*i0*h/r; Fw=CDA*(u
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![matlab知道y求x问题n=600:10:4000;CDA=2.77; f=0.013;m=3880;g=9.8; Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1000).^4; h=0.85;%机械效率 r=0.367;i0=5.83; ig=0.793;ua=0.377*r.*n/(i0*ig); Ft=Tq*ig*i0*h/r; Fw=CDA*(u](/uploads/image/z/993366-54-6.jpg?t=matlab%E7%9F%A5%E9%81%93y%E6%B1%82x%E9%97%AE%E9%A2%98n%3D600%3A10%3A4000%3BCDA%3D2.77%3B+f%3D0.013%3Bm%3D3880%3Bg%3D9.8%3B+Tq%3D-19.313%2B295.27%2A%28n%2F1000%29-165.44%2A%28n%2F1000%29.%5E2%2B40.874%2A%28n%2F1000%29.%5E3-3.8445%2A%28n%2F1000%29.%5E4%3B+h%3D0.85%3B%25%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87+r%3D0.367%3Bi0%3D5.83%3B+ig%3D0.793%3Bua%3D0.377%2Ar.%2An%2F%28i0%2Aig%29%3B+Ft%3DTq%2Aig%2Ai0%2Ah%2Fr%3B+Fw%3DCDA%2A%28u)
matlab知道y求x问题n=600:10:4000;CDA=2.77; f=0.013;m=3880;g=9.8; Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1000).^4; h=0.85;%机械效率 r=0.367;i0=5.83; ig=0.793;ua=0.377*r.*n/(i0*ig); Ft=Tq*ig*i0*h/r; Fw=CDA*(u
matlab知道y求x问题
n=600:10:4000;CDA=2.77;
f=0.013;m=3880;g=9.8;
Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1000).^4;
h=0.85;%机械效率
r=0.367;i0=5.83;
ig=0.793;
ua=0.377*r.*n/(i0*ig); Ft=Tq*ig*i0*h/r;
Fw=CDA*(ua5).^2/21.15;
D=(Ft-Fw)/(m*g);
上面是程序,我想求一下D=f(D=0.013)时ua的值.请大神伸出援手帮帮小弟,
matlab知道y求x问题n=600:10:4000;CDA=2.77; f=0.013;m=3880;g=9.8; Tq=-19.313+295.27*(n/1000)-165.44*(n/1000).^2+40.874*(n/1000).^3-3.8445*(n/1000).^4; h=0.85;%机械效率 r=0.367;i0=5.83; ig=0.793;ua=0.377*r.*n/(i0*ig); Ft=Tq*ig*i0*h/r; Fw=CDA*(u
应该就在99附近吧
要相对准确的值,可以用插值
interp1(D,ua,0.013)
ans =
99.0834
但由于你的D(ua)对于函数,所以ua(D)不是一个单质函数
当D>0.03的那一段时,应该是有两个对应的ua值的,但是插值只能返回一个