Error message, Equations of one or more components may be dependent or inconsistent in simscape model.

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HUANG ZI YOU
HUANG ZI YOU 2022-2-23
回答： Anurag Ojha 2024-2-2
component bilinear_model
nodes
r = foundation.mechanical.translational.translational;
c = foundation.mechanical.translational.translational;
end
parameters
k1 = {1800000,'N/m'};
k2 = {600000,'N/m'};
dy = {0.0053,'m'};
ft = {5500,'N/m'};
fy = {9540,'N'};
un = 1;
tau = {1,'s'};
u0 = {0,'m'};
end
variables
x = {value = { 0, 'm'}, priority = priority.high}; % Deformation
f = {0,'N'};
v = {0,'m/s'};
d_upper = {0,'m'};
d_lower = {0,'m'};
x0 = {0,'m'};
f0 = {0,'N'};
end
branches
f : r.f -> c.f;
end
equations
d_upper == 1/(k1-k2)*(k1*x0-f0-k2*fy/k1+fy);
d_lower == 1/(k1-k2)*(k1*x0-f0+k2*fy/k1-fy);
if x < d_lower
f == k2*(x+(fy/k1))-fy;
elseif x > d_upper
f == k2*(x-(fy/k1))+fy;
else
f == k1*(x-x0)+f0;
end
v == r.v-c.v;
v == x.der;
x0 == x;
f0 == f;
end
end
I specify the bilinear spring in simscape block, to simulate the bilinear specimen.
When I connect to the hydralic system and run, I got the error message.
This is the bilienar model in Matlab bleow, it works perfectly.
function [obj,f1] = dispLoad_bilinear(obj,d1)
k1 = obj(1);
k2 = obj(2);
dy = obj(3);
d0 = obj(4);
f0 = obj(5);
status = obj(6);
fy = obj(7);
% 1) Intersecting x Coordiates
d_upper = 1/(k1-k2)*(k1*d0-f0-k2*fy/k1+fy);
d_lower = 1/(k1-k2)*(k1*d0-f0+k2*fy/k1-fy);
% 2) Determination of x1
if d1<d_lower
f1 = k2*(d1+fy/k1)-fy;
obj(6) = 2;
elseif d1>d_upper
f1 = k2*(d1-fy/k1)+fy;
obj(6) = 2;
else
f1 = k1*(d1-d0)+f0;
end
obj(4) = d1;
obj(5) = f1;

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回答（1 个）

Anurag Ojha
Anurag Ojha 2024-2-2
Hello Huang
The cause of error “Steady state solve failed to converge” could be due to the algebraic loops in your model.
To detect them, please go to Configuration Parameters >> Diagnostics and set Algebraic Loop to 'error'. That will point to the block is causing it.
To solve it, you can place a Unit Delay block in the feedback to the block that is causing the error.
Also, try unchecking the "start simulation from steady state" box under Solver Configuration block.
I hope this helps you to resolve the error!

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