selectASET is an accelerometer selection process that starts with a candidate set test-analysis model (TAM), typically no more than 2,000 DOF, and selects the final accelerometer set by iteratively removing the least important DOF or triaxial accelerometers (triaxes). For each DOF in the candidate set, selectASET calculates the error in the orthogonality metric if that DOF is removed, and the DOF that creates the minimum error (the least important DOF/triax) is statically reduced out of the TAM. This process is repeated until either a user-specified number of DOF remain or the user-specified error is exceeded.
As an example, consider a selectASET execution starting with a candidate set TAM with 2,000 DOF. The first iteration will require calculating the orthogonality of 2,000 different TAM variants, each with 1,999 DOF. For each TAM variant (which has a DOF removed), the error in the orthogonality is calculated and the DOF associated with the TAM variant with the lowest error is statically reduced out of the original candidate set TAM, leaving a 1,999 DOF TAM. The iterative process then restarts, beginning with the 1,999 DOF TAM. Upon completion, the user is presented with a plot of the error as a function of number of DOF, and the user can select the results from any intermediate iteration for further review or export.
selectASET can be operated interactively through the GUI, or it can be called as a function from the command prompt. For instructions on command prompt operation, type >> help selectASET at the MATLAB command prompt.