Systems Engineering Homework 4 Homework submission deadline:20:00,2014-June-28 Discussions with fellow students are encouraged.However,the homework must be completed and submitted on an individual basis.If two or more students submit identical homework solutions,each student will get only a fraction of the grade for this assignment. Late policy:first late day will reduce your assignment grade by 50%.Additional days will reduce the entire homework grade to 0.If you have a special circumstance,please contact jianjun.gao@situ.edu.cn ahead of the submission deadline. Control the font size to 10 or 11. Question 1(40 points) Please choose one area of the Li-ion battery pack for system design improvement,and apply TRIZ to generate at least one concept for design change that will improve the safety of the battery system.The new concept can be your own invention after using TRIZ principles,or it can be design improvements that you have learned from patents or other literature,but explained in terms of TRIZ principles.The aspect of the improvement may be on the technical system,or on the social system.In your answers,please specify the following: 1.The technical problem (10 pts) 2.The technical contradictions-list pairs of technical characteristics that are contradicting.(10 pts) 3.The TRIZ principles reviewed based on the technical contradictions.List the TRIZ principles that inspired you to come up with the design improvements.(10 pts)Please use the TRIZ Table and Matrix. 4.Describe your new design solution(s)(at least one).(10 pts) 5.Discuss if you were able to improve the design without adding another mechanism.Briefly comment on the ideality of system design.(10 pts) Question 2(40 points) fuselage empennage avionics wings suite B engine payload Fig 1.UAV concept,Specifications: L=2000mm,B=3500mm.b=500mm The unmanned aerial vehicle(UAV)"pusher"vehicle concept is shown in Figure 1.In a pusher aircraft,the engine is rear-mounted which can lead to higher propulsive efficiency.The vehicle can be decomposed into
Systems Engineering Homework 4 Homework submission deadline: 20:00, 2014-June-28 Discussions with fellow students are encouraged. However, the homework must be completed and submitted on an individual basis. If two or more students submit identical homework solutions, each student will get only a fraction of the grade for this assignment. Late policy: first late day will reduce your assignment grade by 50%. Additional days will reduce the entire homework grade to 0. If you have a special circumstance, please contact jianjun.gao@sjtu.edu.cn ahead of the submission deadline. Control the font size to 10 or 11. Question 1 (40 points) Please choose one area of the Li-ion battery pack for system design improvement, and apply TRIZ to generate at least one concept for design change that will improve the safety of the battery system. The new concept can be your own invention after using TRIZ principles, or it can be design improvements that you have learned from patents or other literature, but explained in terms of TRIZ principles. The aspect of the improvement may be on the technical system, or on the social system. In your answers, please specify the following: 1. The technical problem (10 pts) 2. The technical contradictions—list pairs of technical characteristics that are contradicting. (10 pts) 3. The TRIZ principles reviewed based on the technical contradictions. List the TRIZ principles that inspired you to come up with the design improvements. (10 pts) Please use the TRIZ Table and Matrix. 4. Describe your new design solution(s) (at least one). (10 pts) 5. Discuss if you were able to improve the design without adding another mechanism. Briefly comment on the ideality of system design. (10 pts) Question 2 (40 points) The unmanned aerial vehicle (UAV) “pusher” vehicle concept is shown in Figure 1. In a pusher aircraft, the engine is rear-mounted which can lead to higher propulsive efficiency. The vehicle can be decomposed into
the following assemblies:fuselage(houses the avionics suite),wings,empennage,payload (a visual and an IR camera,incl.transmitter)and the engine (incl.propeller). After the project start(a)you first have to complete the requirements definition(b)step.Next you will negotiate the engine specification(c)with the supplier.The engine supplier informs you that engine delivery (j)can take place 30 days after you release the engine specification.In parallel (after requirements definition)you can begin the vehicle layout (d)internally in the company and in parallel negotiate the GFE interface (e)with the government.Typical times for GFE delivery (1)after GFE interface release are 10 days.Once you have completed the vehicle layout you can start the fuselage design (f).However,in order to start fuselage design you need to also have the engine specification and the GFE interface done,since the engine hooks to the back of the fuselage and the GFE payload attaches to the nose of the UAV.Once the fuselage design is completed you can do the wing design(g),since you can now estimate the required lift for the vehicle based on the combined weight of the engine,GFE payload and fuselage.Finally,the empennage design (i)sizes the tail of the UAV to balance the pitching moment produced by the wing design.Avionics design(h)can be done after GFE interface definition.Vehicle integration (k)can take place after empennage design and avionics design have been completed and the engine and GFE payload have been delivered.Prototype ground testing(m)follows completion of vehicle integration.Flight testing (n,25) follows ground testing and leads to the end (o)of the UAV development project. Note: -task descriptions are in italics -all tasks are labelled by (a),(b),... Questions: (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. (2)Apply the partitioning algorithm we discussed in class by swapping columns and rows of the DSM in a deliberate fashion.Attempt to improve the task sequence of the project to minimize the iterative loops. Question 3(20 points) Read the lecture notes 8-2(Axiomatic Design part).Find a product yourself.Simply analyze whether it satisfies the design Axiom 1.(please refer the example on page 31 of the lecture notes 8-2)
the following assemblies: fuselage (houses the avionics suite), wings, empennage, payload (a visual and an IR camera, incl. transmitter) and the engine (incl. propeller). After the project start (a) you first have to complete the requirements definition (b) step. Next you will negotiate the engine specification (c) with the supplier. The engine supplier informs you that engine delivery (j) can take place 30 days after you release the engine specification. In parallel (after requirements definition) you can begin the vehicle layout (d) internally in the company and in parallel negotiate the GFE interface (e) with the government. Typical times for GFE delivery (l) after GFE interface release are 10 days. Once you have completed the vehicle layout you can start the fuselage design (f). However, in order to start fuselage design you need to also have the engine specification and the GFE interface done, since the engine hooks to the back of the fuselage and the GFE payload attaches to the nose of the UAV. Once the fuselage design is completed you can do the wing design (g), since you can now estimate the required lift for the vehicle based on the combined weight of the engine, GFE payload and fuselage. Finally, the empennage design (i) sizes the tail of the UAV to balance the pitching moment produced by the wing design. Avionics design (h) can be done after GFE interface definition. Vehicle integration (k) can take place after empennage design and avionics design have been completed and the engine and GFE payload have been delivered. Prototype ground testing (m) follows completion of vehicle integration. Flight testing (n, 25) follows ground testing and leads to the end (o) of the UAV development project. Note: -task descriptions are in italics -all tasks are labelled by (a), (b), … Questions: (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. (2) Apply the partitioning algorithm we discussed in class by swapping columns and rows of the DSM in a deliberate fashion. Attempt to improve the task sequence of the project to minimize the iterative loops. Question 3 (20 points) Read the lecture notes 8-2(Axiomatic Design part). Find a product yourself. Simply analyze whether it satisfies the design Axiom 1. (please refer the example on page 31 of the lecture notes 8-2)
