Force plate calibration matrix

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Sangwoo 2011-5-3

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/6675-force-plate-calibration-matrix

I am a student majoring in biomechanics. I collected data from a force plate with the use of the data acquisition toobox. I collected volatage values ranging from -10 to +10 from a force plate.

However, I cannot collect force data even if I apply the calibration matrix to the voltage signals. In other words, the force values should be more 700. But, the values are still less than 10.

The code I have created is as following.

AI=analoginput('dtol',0);
set(AI,'InputType','SingleEnded');
chan=addchannel(AI,1:6);
set(chan,'InputRange',[-10 10]);
duration=10;
set(AI,'SampleRate',250);
set(AI,'SamplesPerTrigger',2500);
set(AI,'TriggerChannel',chan(3));
set(AI,'TriggerType','Immediate');
start(AI)
while(~AI.Logging)
 disp('Waiting for trigger');
 pause(1);
end
disp('Triggered);
wait(AI,duration*2);
data=getdata(AI);
%ca=calibration matrix provided by AMTI
ca=[2.937 -0.015 0.036 -0.023 0.025 -0.005;0.007 2.923 -0.037 0.040 -0.021 0.020;0.006 0.006 11.469 -0.028 -0.002 -0.011;-0.001 0 0 1.528 -0.002 0.003;0 0.003 0 -0.002 1.528 -0.005;0.008 0 -0.004 0.005 -0.001 0.738];
%k=correction coefficient
k=[0.12207 0.12207 0.12207 0.12207 0.12207 0.12207;-0.12207 -0.12207 -0.12207 -0.12207 -0.12207 -0.12207;0.12207 0.12207 0.12207 0.12207 0.12207 0.12207;12.207 12.207 12.207 12.207 12.207 12.207;-12.207 -12.207 -12.207 -12.207 -12.207 -12.207;12.207 12.207 12.207 12.207 12.207 12.207];
c=ca.*k;
actualdata=c*data';
subplot(6,1,1);plot(actualdata(1,:));
title('GRF & GRM');xlabel('frames');ylabel('force(N)');
subplot(6,1,2);plot(actualdata(2,:));
xlabel('frames');ylabel('force(N)');
subplot(6,1,3);plot(actualdata(3,:));
xlabel('frames');ylabel('force(N)');
subplot(6,1,4);plot(actualdata(4,:));
xlabel('frames');ylabel('Moment(Nm)');
subplot(6,1,5);plot(actualdata(5,:));
xlabel('frames');ylabel('Moment(Nm)');
subplot(6,1,6);plot(actualdata(6,:));
xlabel('frames');ylabel('Moment(Nm)');
delete(AI)
clear AI