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1.2.2 Design Dependencies - DSM Approach In general, a gas turbine engine is designed in much the same way that it is built - from the inside-out. As Hague discussed in his work on parameter-based design ofturbofan gas turbine engines, the order of design of the major engine modules begins with the high pressure compressor (HPC) and proceeds "outward" with the high pressure turbine (HPT), low spool (fan and low turbine), diffuser/combustor, mechanical components (shafts and bearings), and finally the controls and externals3 . The connectivity of these major modules is described in more detail in section 2.1. Hague's work on mapping the turbofan engine development process using the Design Structure Matrix (DSM) shows graphically the interdependence ofthe various design and development tasks. Of interest are the initial turbomachinery design tasks on which the control system is dependent for requirements. Figure 1-2 represents a greatly simplified DSM for a typical commercial turbofan engine4. The rows represent tasks required inthe product development process, in this case high-level design tasks for the major engine modules. The tasks are duplicated for each column across the top ofthe matrix. As indicated inthe annotations, an "X" in a particular row means that in order for the task in that row to be performed, information is required from the task in column containing that "X". Take, for example, the row for HPT (High Pressure Turbine) Design that contains an "X" in the columns labeled "Diffuser/Combustor Design", "LPT Design", and "Control System Design". This indicates that, in order to complete the HPT Design task, information is required from the Diffuser/Combustor Design, LPT (Low Pressure Turbine) Design, and Control System Design 3Hague, Douglas C. "Description of a Turbofan Engine Product Development Process." SM Thesis, Massachusetts Institute ofTechnology, 2000, 52. 4 Adapted from Hague, Douglas C. "Description of a Turbofan Engine Product Development Process." SM Thesis, Massachusetts Institute of Technology, 2000, 49. 15PDF Image | Improving Gas Turbine Engine Control System
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