Aerospace, 9 systems

S. A. Moses, "Explosive Components for Aerospace Systems," in Behaviour and Utilisation ofiExplosives in Engineering Design,... 

The only a-ahoy of commercial importance is Ti—5A1—2.5Sn. This ahoy is weldable, has good elevated temperature stabhity and good oxidation resistance to about 600°C, and is used for forgings and sheet-metal parts, such as aircraft engine compressor cases because of its weldabhity. The ELI version of this ahoy is used in the cryogenic area of rocket engines. However, the ahoy is difficult to produce and has not been designed into more recent aerospace systems. 

The practical needs of military and aerospace systems tended to focus interest on human-machine interfaces (e.g., aircraft cockpits), with particular emphasis on information displays and the design of controls to minimize error. The predominant model of the human prevalent at that time (called behaviorism) concentrated exclusively on the inputs and outputs to an individual and ignored any consideration of thinking processes, volition, and other... 

Large reservoirs are desirable for cooling. A large reservoir also reduces re-circulation, which helps settle contamination, and separates entrained air. As a mle of thumb, the ideal reservoir should be two to three times the pump outlet per minute. However, due to space limitations in mobile and aerospace systems, the benefits of a large reservoir may have to be sacrificed. But they must be large enough to accommodate thermal expansion of the fluid and changes in fluid level due to system operation. 

This type of controller design has been around for many years. The pole-placcmcnt methods that are used in aerospace systems use the same basic idea the controller is designed so as to position the poles of the closedloop transfer function at the desired location in the s plane. This is exactly what we do when we specify the closedloop time constant in Eq. (11.63). 

A pre-production contract was started in Sept 1977, with full production following in 1978. Deliveries will continue from 1979 until 1983. The manufacturer is the Bendix Corp, Aerospace Systems Division, Mishawaka, Indiana, USA... 

Current address Aerospace Systems Division, Harris Corporation, Box 37, Melbourne, FL 32901... 

Catalytic electrode development has involved the identification of a ternary oxygen evolution catalyst which offer both reduced cost and improved performance in comparison to the current state-of-the-art for aerospace systems. 

Polymers and composites are finding ever-increasing use as structural components in aerospace systems because of their attractive strength/weight characteristics. During the past 20 years, their use in military aircraft has increased from essentially zero in F-4 jets to over 25% in the advanced AV8-B Harrier II. Thermosetting resins, particularly epoxies and polyimides, are of prime interest for use in structural applications. 

The tests are again useful and have permitted the development of sophisticated fuzes for advanced military and aerospace systems. For limited-production items success may always be achieved by overdesign mass production tolerates a certain dud rate, and quality assurance may often be based on no more than the subjective assessment of whether or not a component goes bang at a customary level. 

Research and development in the aerospace industry have revitalized interest in structural metals with high specific properties. Specific strength and stiffness are two mechanical characteristics, which are the most important for nearly each structural component of aerospace systems. 

D. D. Carlson and R. H. Underwood, Design of an Aerospace Systems Environmental Chamber, AEDC-TR-61-10 (July 1961). 

Tomizuka M et al. (eds) (2007) Sensors and smart structures technologies for civil, mechanical and aerospace systems 2007, San Diego, California, USA, 19-22 March 2007 (sponsored and published by SPIE - The International Society for Optical Engineering et al.)... 

AEROSPACE SYSTEMS DIV BOEING COMP SEATTLE WASHINGTON... 

An introduction to control theory, with sample applications in biological, electronic, quantmn, information, mechanical, and aerospace systems and robotics, and a discussirm of the modeling that is necessary for control algorithm design can be foimd in Astrom and Murray [2]. A more limited discussion of implementing control for systems well described by linear dynamics can be foimd in [4]. Modem and future high-impact applications for control theory are discussed in the report [5]. Directions for and challenges in control of micro- and nanoscale systems are... 

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