hw2_solutiondd - ESD.36J System and Project Management HW2...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ESD.36J System and Project Management Master Solution HW2 – Task-based Design Structure Matrix Due: 9/18/03 1. Construct a Design Structure Matrix (DSM), with dimensions 13x13, including all UAV tasks b through n (all tasks except “start” and “finish”). This DSM should capture the same task dependencies as the project graph from HW1.2. Comment briefly on the structure of the completed matrix. I used PSM32 to construct the DSM and then exported it to EXCEL, as below: I t e m s 1 2 3 4567 891 01 11 2 1 3 1! Requirement definition b 2! Engine specification 1 c 3! Vehicle layout 1 d 4! GFE interface 1 e 5! Fuselage design 1 1 1 f 6! Wing design 1 g 7! Avionics design 1 h 8! Empennage design 1 i 9! Engine delivery 1 j 10! Vehicle integration 1 1 1 k 1 11! GFE delivery 1 l 12! Ground testing 1 m 13! Flight testing 1 n The DSM is almost a lower triangular matrix because it is constructed from the CPM project graph directly and there are in fact no iterative task relationships present. The “1” between tasks k and l in the above figure does not represent true feedback, rather it is an artifact of DSM sequencing. If we swap the columns and rows of k and l, that particular entry would disappear and the matrix would indeed be a pure lower triangular matrix. We have recognized by now that classical CPM/PERT allows only open graphs, therefore suppressing the representation of any feedback loops. However, realistic product development projects contain multiple planned and unplanned iteration loops. Note that each entry in the matrix above that represents a dependence relation has a value of 1. Although in PSM32 such an entry should have a value of 0, it is changed to 1 to be compatible with sub-question 3. The main diagonal elements contain the task symbol from the project graph in HW1. 2. … Modify the DSM to reflect these interactions and briefly comment on the changes. The description in HW2 can be interpreted as a set of additional precedence relationships that were not part of the CPM graph and the original lower triangular DSM. Careful interpretation of the iteration description gives rise to the following seven additional entries in the DSM: DSM(2,13)=1 – feedback from flight test (n) to engine specification (c) DSM(3,8)=1 – feedback from empennage design (i) to vehicle layout (d) DSM(4,13)=1 – feedback from flight test (n) to GFE interface definition (e)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
DSM(5,7)=1 – feedback from avionics design (h) to fuselage design (f) DSM(6,12)=1 – feedback from ground test (m) to wing design (g) DSM(7,5)=1 – feedback from fuselage design (f) to avionics design (h) DSM(7,12)=1 – feedback from ground test (m) to avionics design (h) The modified DSM is: I t e m s 1 2 3 4567 891 01 11 2 1 3 1! Requirement definition b 2! Engine specification 1 c 1 3! Vehicle layout 1 d 1 4! GFE interface 1 e 1 5! Fuselage design 1 1 1 f 1 6! Wing design 1 g 1 7! Avionics design 1 1 h 1 8! Empennage design 1 i 9! Engine delivery 1 j
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

hw2_solutiondd - ESD.36J System and Project Management HW2...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online