# Units for constants in simscape custom module

조회 수: 4(최근 30일)
Steven 2017년 2월 3일
댓글: Steven 2017년 2월 6일
I have a constant that I have declared in the variables section. I'm assuming that everything needs units. Some papers use constants that use equations with units that don't match (on one side of the equation its a constant and on the other side might be V/K)
variables(Access=private)
cm = { 0, '' };
i = { 2, 'A' };
V1= { 0, 'V' };
T1 = { 0, 'K' };
end
in the equations section if I mix up the units will it throw an error?
equations
i == V1*T1;
end
is there some way to have a unitless constant that doesn't have units?
equations
cm == V1*T1;
end
##### 댓글 수: 3표시숨기기 이전 댓글 수: 2
Steven 2017년 2월 6일
This doesn't solve my problem right now however, because I have Kelvin/Kelvin and its not going to unitless. Example:
nodes %conserving ports
Ta = foundation.thermal.thermal; % H:top
Tb = foundation.thermal.thermal; % C:bottom
end
variables
R = {334, '1'};
end
parameters
cTemp = {3.2342, '1'};
end
equations
R == (Th.T - cTemp)/Th.T;
end
This will not compile. Even changing R and cTemp to units of K will not compile

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### 답변(1개)

Nirja Mehta 2017년 2월 6일
Assign '1' as the unit of "cm".
##### 댓글 수: 1표시숨기기 없음
Steven 2017년 2월 6일
That compiles, but I can't combine a that is set with R = {334, '1'}; value with any other unit in an equation so it doesn't have that much use. I need a true unitless value that will compile

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