Gokcin Cinar

Gokcin Cinar
University of Michigan | U-M · Department of Aerospace Engineering

PhD in Aerospace Engineering

About

24
Publications
1,630
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102
Citations

Publications

Publications (24)
Article
Purpose The purpose of this paper was to create a generic and flexible framework for the exploration, evaluation and side-by-side comparison of novel propulsion architectures. The intent for these evaluations was to account for varying operation strategies and to support architectural design space decisions, at the conceptual design stages, rather...
Conference Paper
This paper presents a parametric modeling and integrated sizing approach for a charge-depleting parallel hybrid electric aircraft. The hybrid powertrain model is integrated within a regional aircraft with an entry-into-service of 2030-2035. In addition to the physical architecture, different operational modes enabled by the hybridization of the pro...
Article
View Video Presentation: https://doi.org/10.2514/6.2022-3290.vid Abstract – This paper will be exploring different hybrid configurations and comparing their fuel burn benefits in an attempt to identify whether hybrid electric, hybrid with hydrogen fuel cells or a combination of the two will bring the aviation sector closer towards decarbonization....
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2022-1994.vid This paper explores the design spaces of a thin-haul and a regional aircraft with parallel hybrid electric propulsion architectures and an entry into service date of 2030. Notional technology reference aircraft models were developed for a 19- and a 50-passenger aircraft based on publi...
Conference Paper
Full-text available
View Video Presentation: https://doi.org/10.2514/6.2021-3289.vid Distributed propulsion systems are enabled by electrified aircraft and can provide aero-propulsive benefits. The magnitude and impact of these benefits rely on the location of propulsors on the vehicle, the amount of propulsive force generated by those propulsors, vehicle geometry, an...
Conference Paper
View Video Presentation: https://doi.org/10.2514/6.2021-3327.vid Under the NASA University Leadership Initiative (ULI) program, researchers from multiple institutes are collaborating on development of technologies for a hybrid turboelectric distributed propulsion (HTeDP) regional jet which aims to enter service in the 2030 timeframe. The performanc...
Conference Paper
Under the NASA University Leadership Initiative (ULI) program, a team of universities are collaborating on the advancement of technologies a hybrid turboelectric regional jet, with an intent to enter service in the 2030 timeframe. In the previous studies of the ULI program, the in-service benefits of the technologies under development were analyzed...
Conference Paper
Full-text available
Electrified propulsion systems can provide potential environmental and performance benefits for future aircraft. The choice of the right propulsion architecture and the power management strategy depends on a number of factors, the airframe, electrification objectives and metrics of interest being the most critical ones. Therefore, the generic advan...
Conference Paper
A team of researchers from multiple universities are collaborating on the demonstration of a hybrid turboelectric regional jet for 2030 under the NASA ULI Program. The thermal management is one of the major challenges for the development of such an electric propulsion concept. Existing studies hardly modeled the thermal management systems with the...
Conference Paper
In typical multidisciplinary design optimization problems, with varying missions, aerodynamic data, engine data, Thermal Management Systems (TMS), and other parameters it can take upwards of millions of runs to cover the full design space which result in extremely large computational burden, reducing the effectiveness of the design process. The obj...
Conference Paper
The drive for more efficient flying vehicles in all categories may necessitate a significant departure from the tube-and-wing or rotary-wing norms that have been the mainstay of aviation for many decades. This poses challenges for predicting the aerodynamic characteristics and the weight build-up of such unconventional vehicles in early design phas...
Conference Paper
This paper presents a methodology for the sizing and synthesis of power generation and distribution (PG&D) subsystems. The PG&D subsystem models developed in a previous work done by the authors were applied within a parallel hybrid electric propulsion architecture using the Dornier 328 as the baseline aircraft. The hybridization took place only dur...
Conference Paper
The ongoing efforts to reduce aviation related greenhouse gas emissions and fuel burn have led to advancements in power generation and distribution (PG&D) subsystem technology. Due to the absence of historical data, PG&D subsystem models must be created from first-order analysis without compromising crucial information on their characteristics.This...
Conference Paper
Traditionally, interactions between aircraft and their subsystems are estimated by empirical relationships based on historical data. However, in the case of unconventional designs or implementation of recent technologies, these estimations cannot fully capture the interactions between system and subsystem levels. This paper lays out a methodology f...
Conference Paper
This paper lays out a methodology for evaluating system-level requirements feasibility during System-of-Systems (SoS) conceptual design, especially in the absence of historical data, and simultaneously documents the methodology’s application to the design of small aerial vehicles. Developed as part of a larger effort to set requirements for autonom...
Article
When Cassini passes through Saturn's inner magnetosphere, the Radio and Plasma Wave Science (RPWS) instrument occasionally observes a series of whistler mode emissions that each rise in frequency over a period of five to ten minutes and repeat every five to ten minutes. These waves are present in the RPWS data set from 2005 through the present date...
Article
In Saturn's magnetosphere, the electron density inside of 5-6 RS has been shown to vary with longitude. When Cassini passes through this space, the Radio and Plasma Wave Science (RPWS) instrument occasionally observes a series of whistler mode emissions that each rise in frequency over a period of five to ten minutes and repeat every five to ten mi...

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