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Sundararajan V.,AIAA - American Institute of Aeronautics and Astronautics
AIAA SPACE 2013 Conference and Exposition | Year: 2013

India's space program has evolved from an Earth observation orientation to a multidimensional space program that includes several space exploration missions to the Moon, Mars and space observatories. The successful launch of the Chandrayaan-1 mission to the Moon in 2008 is a harbinger for the emerging Indian Space Exploration Program (ISEP). Indian Space Research Organization (ISRO) is scheduled to launch a Mars Orbiter ("Mangalyaan") mission in October-November 2013 and a multi-wavelength astronomical observatory (Astrosat-1) mission to be launched in 2014. The design, development and operation of a spacecraft for an interplanetary mission or for an astronomical observatory are a complex technical project endeavor. Systems engineering tools are utilized to analyze project architectures and technology choices during the project planning phase. Design Structure Matrix (DSM) is a network modeling tool used for designing, developing and managing complex systems. This paper presents a component based interface-technology risk design structure matrix (TR-DSM) analytical framework for evaluating project risk assessment of three of India's space exploration missions - Chandrayaan-1 orbiter mission to the Moon, Mangalyaan orbiter mission to the Mars and the Astrosat-1 multi-wavelength astronomical observatory. Source


Meng T.,Zhejiang University | Matunaga S.,Tokyo Institute of Technology | Matunaga S.,AIAA - American Institute of Aeronautics and Astronautics
Journal of Guidance, Control, and Dynamics | Year: 2011

The article presents a simple modified singular-direction avoidance steering (SDA) method while achieving similar performance with current, more complicated, methods. Based on the principle of singular-value decomposition (SVD), the SDA steering logic is augmented with a geometric principal rotation of singular vectors. This rotation introduces additional torque direction error to prevent zero gimbal-rate output when commanded torque is nonzero. When the commanded torque lies in the plane orthogonal to the direction of the smallest singular value, the SDA steering law can obtain an exact solution. The torque error is determined by both the torque projection change and the singular-value redistribution of the smallest singular value. It is equivalent to add a torque error to change the direction of the commanded torque. Meanwhile, a singularity avoidance parameter on the smallest singular value is used to adjust the singular-value redistribution of the Jacobian matrix. Source


Gruntman M.,AIAA - American Institute of Aeronautics and Astronautics
Proceedings of the IEEE | Year: 2016

This article tells a little known story of the first anti-aircraft system SA-1 in the Soviet Union, the first nonnuclear intercept of a long-range ballistic missile, and emergence of missile defense. © 2016 IEEE. Source


Sundararajan V.,AIAA - American Institute of Aeronautics and Astronautics
AIAA SPACE 2013 Conference and Exposition | Year: 2013

On August 15, 2012, the 66th Independence Day of India, Prime Minister Dr. Manmohan Singh formally announced Mangalyaan, the nation's first interplanetary mission to Mars. The Mars Orbiter mission was initiated by the Indian Space Research Organization (ISRO) to study the upper atmosphere of the most Earth like planet in the Solar System. Mangalyaan orbiter is planned to be launched to an initial Earth orbit in October 2013 by a PSLV-XL rocket. The spacecraft will begin the Mars Transfer Trajectory (MTT) on November 26, 2013. By September 22, 2014, the spacecraft will be placed in a highly elliptical orbit after the crucial Mars Orbit Insertion (MOI) maneuver by firing the 440 N Liquid Apogee Motor (LAM). The Indian Mars Orbiter mission is being developed as a technology demonstration mission with five experimental science payloads. One of the main objectives of the first Indian mission to Mars is to develop the technologies required for the design, planning, management and operations of an interplanetary mission. This paper presents an overview of the technology and science objectives of India's first interplanetary mission to Mars, launch vehicle, spacecraft architecture, science instruments, mission design and program management. Source


Sundararajan V.,AIAA - American Institute of Aeronautics and Astronautics
2013 Aviation Technology, Integration, and Operations Conference | Year: 2013

General Aviation (GA) plays a significant role in the national economy and is the primary training ground for most commercial pilots. Single-engine piston airplanes comprise about 60% of GA fleet in the United States. The introduction of the Light Sport Aircraft (LSA) category and the Sport Pilot certificate regulations by the Federal Aviation Administration (FAA) in 2004 provided impetus in access to sport and recreational aviation. The design and development of modern GA piston airplanes utilizes several systems engineering management tools for sustainable product development (SPD). This paper presents case studies on piston airplane design using engineering management tools such as stakeholder analysis, design structure matrix (DSM), domain mapping matrix (DMM) and modularity. Source

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