error in matrix multiplication and integration
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%%
clc;
clear;
syms x;
%pi = 180.;
% syms y_x;
% syms y_x_das;
L = 100.;
E = 29000. ;
c = 0.1*L;
d_0 = 5.;
d_1 = 2.*d_0;
d_x = 2.*d_0*(x/(2.*L));
b = 2.;
I_z = (b*d_x.^3)/12.;
G = 11000.;
A_x = b*d_x;
As = 5/6*A_x;
y_x = c*sin(2*pi*x/L);
y_x_das = diff(y_x);
theta_2 = atan(y_x_das);
Q_a = [-cos(theta_2) -sin(theta_2) 0];
Q_s = [-sin(theta_2) -cos(theta_2) 0];
Q_b = [-c*sin((2*pi*x)/L) x -1];
%%
%flexibility matrix
d1= sqrt(1 + y_x_das.^2).*((Q_a'.*Q_a)./(A_x*E));
d1_int = integral(@(x) d1(), 0, 100., 'ArrayValued', 1);
9 个评论
Walter Roberson
2022-10-28
mat2str() will show it with just one []
Note: mat2str() may lose the bottom bit of numbers. format long g loses the bottom bit of numbers. If you need to be able to exactly reproduce the array then you will need to create your own function to convert it.
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