AFSC PAMPHLET 800 27 PDF

In this pamphlet, derating is defined as the practice of limiiing electrical, thermal, and mechanical stresses on parts devices to levels below their specified or proven capabilities in order to enhance reliability. Even the best parts, when operated at maximum rated stress levels, will have above average failure rates. Therefore, if a system is expected to be reliable, it will need to have a conservative design approach with realistic derating of parts. Derating increases the margin between the operating stress level and the maximum stress level, thus protecting the system from unexpected design anomalies. Realizing a need for derating electronic and electromechanical parts, many manufacturers have created design guidelines. These derating levels should not be considered absolute values.

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In this pamphlet, derating is defined as the practice of limiiing electrical, thermal, and mechanical stresses on parts devices to levels below their specified or proven capabilities in order to enhance reliability. Even the best parts, when operated at maximum rated stress levels, will have above average failure rates. Therefore, if a system is expected to be reliable, it will need to have a conservative design approach with realistic derating of parts.

Derating increases the margin between the operating stress level and the maximum stress level, thus protecting the system from unexpected design anomalies. Realizing a need for derating electronic and electromechanical parts, many manufacturers have created design guidelines.

These derating levels should not be considered absolute values. Derating is always a compromise between size, weight, and cost and failure rate. Excessive derating can result in unnecessary increases in part count, thereby increasing the overall circuit predicted failure rate; therefore, engineering judgment is necessary in choosing the most effective level of derating.

For most applications, these guidelines are minimum derating for stated levels and will not result in significant size, weight, or cost penalties. A careful analysis of the design to evaluate all the trade-offs should be performed for those cases in which it may be advisable to exceed the guidelines. Minor deviations from these guidelines may have small effect on the predicted failure rate. If derating requirements are to be implemented in a system or equipment specification, a method of verifying the requirements through analysis and testing must be specified.

An approach for verifying derating requirements, called thermal and stress verification, is in chapter 3. This section covers the percentage of measurements to be performed, categorization of part types, procedures for conducting the test, when to start testing, and what should be done for overstressed parts.

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AFSC PAMPHLET 800 27 PDF

E signal combining network which is dedicated to the receive function. The seeker must have a multispectral capability in order to successfully engage advanced Low Observable aircraft and missiles. In both cases only the matching networks were made of HTS material. Advanced Technology Component Derating by Timothy A Jennings 1 edition published pamphoet in English and held by 1 WorldCat member library worldwide This report has been prepared to summarize the technical study performed to determine the derating criteria of advanced technology components. An electrically small superdirective monopole array with superconducting matching networks is a candidate for use in an air-to-air missile as part of a multispectral seeker. The air-to-air missile guidance is initially provided by a surveillance and control aircraft.

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AFSCP 800-27

Kazrabei The electrically small monopole antenna and the electrically small element monopole antenna array were operated in the UHF band because the need exists for a high efficiency afdc small array operating in the UHF range as part of a multispectral seeker of an air-to-air missile. Project Page Feedback Known Problems. The air-to-air missile guidance is initially provided by a surveillance and control aircraft. Advanced Technology Component Derating by Timothy A Jennings 1 edition published in in English and held by 1 WorldCat member library worldwide This report has been prepared to summarize the technical study performed to determine the derating criteria of advanced technology components. Superconducting Matching Networks in Monopole Antennas 1 edition published in in English and held by 1 WorldCat member library worldwide The goals of this program were to demonstrate the performance advantages of UHF Super Directive Array using a monopole antenna matching network made of high temperature superconducting HTS material over a monopole antenna matching network made of gold and to demonstrate the feasibility of using HTS material matching networks to feed a two element electrically small superdirective monopole array. In both cases only the matching networks were made of HTS material.

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