# Error in Plotting The Surface graph.

조회 수: 32 (최근 30일)
Shivam Bajpai 2022년 4월 24일
댓글: Walter Roberson 2022년 4월 25일
clc
clear all
close all
%% Aircraft Parameters
b= 222.6664; %ft
l=247.9163; % ft
S=6200; %ft^2
CR=45.4165; %ft
CT=15.332; %ft
AR=7.3;
TR=0.34;
lamda= 25; %degree
W=650000; %pound
mach=0.77;
sound_speed=967.52; %in feet/sec
density=5.87; % in slug/ft^3
cruise_weight=650000; %in pounds
%% Wake model
b_red=(3.14/4)*b;
velocity=mach*sound_speed;
Circulation=cruise_weight/(velocity*density*b_red);
y=-0.3*b:9:0.1*b;
z=-0.3*b:9:0.1*b;
[y,z]=meshgrid(y,z);
x=2*b +zeros(10,10);
rc=5;
% %%upwash_avg
syms s
chord_length=((2*S)/(b*(1+TR))*(1-(1-TR)*(2*s)/b));
right_wing=(Circulation/(4*3.14))*((y+s)./( (y+s).^2+ z.^2 + rc.^2)).*(1+(x./sqrt(x.^2+(y+s).^2+z.^2)))*chord_length;
left_wing=(Circulation/(4*3.14))*((y+b+s)./( (y+b+s).^2+ z.^2 + rc.^2)).*(1+(x./sqrt(x.^2+(y+b+s).^2+z.^2)));
I = (1/b)*((left_wing+right_wing)*chord_length);
qwe=int(I,s,0,b);
surf( y/b,z/b,qwe)
%%Error is Showing
Error using matlab.graphics.chart.primitive.Surface
Invalid parameter/value pair arguments.
Error in surf (line 145)
hh = matlab.graphics.chart.primitive.Surface(allargs{:});
Error in research_ff (line 38)
surf( y/b,z/b,qwe)
>>

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### 채택된 답변

Walter Roberson 2022년 4월 24일
qwe=int(I,s,0,b);
That is symbolic
surf( y/b,z/b,qwe)
surf cannot handle symbolic arguments, even if the symbols could be fully approximated as double.
You need to double(qwe) if it does not contain any free variables after integrating. If it contains free variables then fsurf()
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Walter Roberson 2022년 4월 25일
clc
clear all
close all
%% Aircraft Parameters
b= 222.6664; %ft
l=247.9163; % ft
S=6200; %ft^2
CR=45.4165; %ft
CT=15.332; %ft
AR=7.3;
TR=0.34;
lamda= 25; %degree
W=650000; %pound
mach=0.77;
sound_speed=967.52; %in feet/sec
density=5.87; % in slug/ft^3
cruise_weight=650000; %in pounds
%% Wake model
b_red=(3.14/4)*b;
velocity=mach*sound_speed;
Circulation=cruise_weight/(velocity*density*b_red);
y=-0.3*b:9:0.1*b;
z=-0.3*b:9:0.1*b;
[y,z]=meshgrid(y,z);
x=2*b +zeros(10,10);
rc=5;
% %%upwash_avg
syms s
chord_length=((2*S)/(b*(1+TR))*(1-(1-TR)*(2*s)/b));
right_wing=(Circulation/(4*3.14))*((y+s)./( (y+s).^2+ z.^2 + rc.^2)).*(1+(x./sqrt(x.^2+(y+s).^2+z.^2)))*chord_length;
left_wing=(Circulation/(4*3.14))*((y+b+s)./( (y+b+s).^2+ z.^2 + rc.^2)).*(1+(x./sqrt(x.^2+(y+b+s).^2+z.^2)));
I = (1/b)*((left_wing+right_wing)*chord_length);
qwe = vpaintegral(I, s, 0, b);
whos
Name Size Bytes Class Attributes AR 1x1 8 double CR 1x1 8 double CT 1x1 8 double Circulation 1x1 8 double I 10x10 8 sym S 1x1 8 double TR 1x1 8 double W 1x1 8 double b 1x1 8 double b_red 1x1 8 double chord_length 1x1 8 sym cruise_weight 1x1 8 double density 1x1 8 double l 1x1 8 double lamda 1x1 8 double left_wing 10x10 8 sym mach 1x1 8 double qwe 10x10 8 sym rc 1x1 8 double right_wing 10x10 8 sym s 1x1 8 sym sound_speed 1x1 8 double velocity 1x1 8 double x 10x10 800 double y 10x10 800 double z 10x10 800 double
surf( y/b, z/b, double(qwe))

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