A summary of the propulsion system modeling under NASA's High Speed Project (HSP) AeroPropulsoServoElasticity (APSE) task is provided with a focus on the propulsion system for the lowboom supersonic configuration developed by Lockheed Martin and referred to as the N+2 configuration. This summary includes details on the effort to date to develop computational models for the various propulsion system components. The objective of this paper is to summarize the model development effort in this task, while providing more detail in the modeling areas that have not been previously published. The purpose of the propulsion system modeling and the overall APSE effort is to develop an integrated dynamic vehicle model to conduct appropriate unsteady analysis of supersonic vehicle performance. This integrated APSE system model concept includes the propulsion system model, and the vehicle structural-aerodynamics model. The development to date of such a preliminary integrated model will also be summarized in this report. IntroductionHE slender configuration of low-boom aircraft, combined with rigid body effects and non-linear aerodynamics, often results in highly complex nonlinear aeroelastic/flight dynamics phenomena. Combined with the propulsion system, the AeroServoElastic ASE/APSE dynamic coupling phenomena and the resulting structural oscillations can affect the ride quality, and the vehicle flight dynamics and control. The APSE dynamic effects can simultaneously influence the airframe and propulsion system controls to produce undesirable effects on performance and flying characteristics. Thus, these APSE phenomena need to be thoroughly understood for supersonic flight to be safe, efficient and comfortable. Understanding these phenomena through the modeling capabilities that are being developed will provide the opportunity to use active controls to mitigate these undesirable effects in order to improve performance such as ride quality, vehicle stability, and flight efficiency. This new research will enhance the analysis and design capabilities for slender supersonic aircraft.A top priority for the High Speed Project ASE task is to develop the tools required to perform accurate, high fidelity Aeroelastic (AE), ASE, and APSE analyses in support of the design of future low-boom supersonic civil aircraft. As a means of accomplishing that priority, the NASA HSP is working with Lockheed Martin to develop vehicle concepts and analyze the performance of these vehicles. Under the NASA N+2 (2 generations from present state) design, Lockheed Martin has developed a low-boom supersonic configuration as shown in Fig. 1.A vast knowledge base of analytical, computational, wind tunnel and flight data exists on the ASE subsonic vehicles and supersonic fighter aircraft, but considerably less data are available in this area for supersonic cruise configurations. Reference 1 describes the developments to date in ASE that are also utilized for this overall APSE effort. For propulsion system dynamics modeling and testing, there is not much releva...
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