Concise Encyclopedia of System Safety: Definition of Terms by Clifton A. Ericson II

By Clifton A. Ericson II

The 1st finished reference paintings overlaying defense specialist terminologyA handy table reference designed to fill a major hole within the method security physique of information, the Concise Encyclopedia of approach safeguard: Definition of phrases and ideas is the 1st booklet explicitly dedicated to defining process protection phrases and ideas and designed to assist safeguard pros fast and simply find the definitions and data which they should remain abreast of study new and previous. Definitions for safety-related terminology presently vary among person books, directions, criteria, or even legislation. constructing a unmarried universal and entire set of definitions for the 1st time, with examples for every, the ebook revolutionizes the way safeguard pros may be able to comprehend their box. The definitive source dedicated to defining the entire significant phrases and ideas utilized in procedure defense and reliability in one quantity, Concise Encyclopedia of procedure defense is the go-to e-book for platforms safeguard engineers, analysts, and bosses as they come upon new phrases, or desire a precise, technical definition of universal phrases.

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ACTUATOR An actuator is an electromechanical device that is a mechanism used to effect or produce motion. It is a power mechanism that typically converts electrical, hydraulic, or pneumatic energy into longitudinal or rotary motion. Actuators are used for many purposes, such as moving flight control surfaces and opening/ closing valves. Whenever actuators are used in a system design, they should always be considered as potential hazard sources or hazard initiating mechanisms (IMs), which require further safety evaluation.

The two levels of autonomy are defined as follows: • • Fully autonomous—A mode of operation wherein the UMS is expected to accomplish its mission, within a defined scope, without human intervention. Semiautonomous—A mode of operation wherein the UMS accomplishes its mission with some level of human interaction. System safety is a prime consideration in the design and operation of autonomous systems. The autonomous mode of operation of a system can be safetycritical, should it fail to operate or operate incorrectly, particularly without detection or warning.

An accident is an unplanned event, or events, that results in an outcome culminating in death, injury, damage, harm, and/or loss. An accident is the event and associated outcome that results from an actualized hazard. There is a direct relationship between hazards and accidents. indd 19 4/6/2011 10:01:35 AM 20 SYSTEM SAFETY TERMS AND CONCEPTS aircraft the resulting outcome. This accident could be the result of a hazard such as insufficient fuel during flight to allow for a safe landing. In system safety, the terms accident and mishap are synonymous, and no distinction should be made between the two terms.

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