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IEEE 750
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IEEE 750 1947 Edition, July 1, 1947 Report on AIRCRAFT ELECTRIC SYSTEM GUIDE
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Description / Abstract:
Scope of This Report
Material comprising this report is directed expressly at the attainment of improved application technique—the attainment of the highest possible quality of performance from a combination of particular devices to perform a given function. The performance qualities exhibited by a composite system composed of numerous devices will be influenced by the character of devices which are selected to work together and the manner in which they are interconnected or correlated. The extent to which such composite systems may be benefited by proper application technique is much greater than would be expected or imagined.
Realization of the stated objectives involves comprehensive treatment of the following character expressed quantitatively in simple compact form.
An explanation of the fundamental electrical problems involved.
Typical characteristic performance data of the various elements and devices of which the system is composed which shall define inherent limitations as well as meritorius qualities.
Methods of analysis or test by which the qualities and limitations of a particular compositedevice system may be evaluated.
Formulation of particular application practices which may be accepted with the assurance that good performance quality will be realized.
Formulation of a general analysis procedure (preferable in chronological order) which will outline the various factors which must be examined or checked.
While it will be the purpose of this report to refrain from defining or dictating specific characteristics of particular devices, it is quite possible that desirable features brought out by application considerations may be of considerable assistance to other groups in creating new devices or improving existing ones.
Electrical applications in aircraft assume many peculiar aspects. Weight and space in aircraft are of great importance, and reductions in these quantities deserve infinitely greater consideration than in equipment for land service. Equipment must be capable of successful operation in the presence of wide variations in ambient temperature, humidity, and altitude. In general, equipment must be capable of withstanding severe vibration in the member which supports it. Apart from these considerations which are peculiar to aircraft service, all knowledge accumulated through years of industrial experience should be used to the fullest advantage in bettering the performance of aircraft electric systems.
The electrical divisions of present aircraft manufacturing organizations are, for the most part, relatively young and include personnel who have not had extensive experience in electrical application. The electric system incorporated in a typical aircraft has grown from simple non-essential character (resembling that incorporated in an automobile) to an extensive general-purpose system incorporating vital functions, all in the span of a few years. It is apparent that immense benefits can result from a readily available summary of good application principles which are founded on sound engineering fundamentals.
The unprecedented expansion of size and number of aircraft with ever-increasing electric systems which has occurred since the beginning of the war, principally for military service, has resulted in the accumulation of much knowledge and experience relative to good electrical application practice. It is important that this vast reservoir of knowledge be tapped, coordinated, and compiled in the form of a permanent record.
In the final analysis, the resulting benefits will be measurable in terms of
1. Improved reliability; fewer outages; less maintenance.
2. Lighter weight.
3. Simplification of installation; operation; maintenance.
4. Greater safety to electric equipment; airplane; personnel.
5. Lower monetary cost of aircraft electrical service.
Material comprising this report is directed expressly at the attainment of improved application technique—the attainment of the highest possible quality of performance from a combination of particular devices to perform a given function. The performance qualities exhibited by a composite system composed of numerous devices will be influenced by the character of devices which are selected to work together and the manner in which they are interconnected or correlated. The extent to which such composite systems may be benefited by proper application technique is much greater than would be expected or imagined.
Realization of the stated objectives involves comprehensive treatment of the following character expressed quantitatively in simple compact form.
An explanation of the fundamental electrical problems involved.
Typical characteristic performance data of the various elements and devices of which the system is composed which shall define inherent limitations as well as meritorius qualities.
Methods of analysis or test by which the qualities and limitations of a particular compositedevice system may be evaluated.
Formulation of particular application practices which may be accepted with the assurance that good performance quality will be realized.
Formulation of a general analysis procedure (preferable in chronological order) which will outline the various factors which must be examined or checked.
While it will be the purpose of this report to refrain from defining or dictating specific characteristics of particular devices, it is quite possible that desirable features brought out by application considerations may be of considerable assistance to other groups in creating new devices or improving existing ones.
Electrical applications in aircraft assume many peculiar aspects. Weight and space in aircraft are of great importance, and reductions in these quantities deserve infinitely greater consideration than in equipment for land service. Equipment must be capable of successful operation in the presence of wide variations in ambient temperature, humidity, and altitude. In general, equipment must be capable of withstanding severe vibration in the member which supports it. Apart from these considerations which are peculiar to aircraft service, all knowledge accumulated through years of industrial experience should be used to the fullest advantage in bettering the performance of aircraft electric systems.
The electrical divisions of present aircraft manufacturing organizations are, for the most part, relatively young and include personnel who have not had extensive experience in electrical application. The electric system incorporated in a typical aircraft has grown from simple non-essential character (resembling that incorporated in an automobile) to an extensive general-purpose system incorporating vital functions, all in the span of a few years. It is apparent that immense benefits can result from a readily available summary of good application principles which are founded on sound engineering fundamentals.
The unprecedented expansion of size and number of aircraft with ever-increasing electric systems which has occurred since the beginning of the war, principally for military service, has resulted in the accumulation of much knowledge and experience relative to good electrical application practice. It is important that this vast reservoir of knowledge be tapped, coordinated, and compiled in the form of a permanent record.
In the final analysis, the resulting benefits will be measurable in terms of
1. Improved reliability; fewer outages; less maintenance.
2. Lighter weight.
3. Simplification of installation; operation; maintenance.
4. Greater safety to electric equipment; airplane; personnel.
5. Lower monetary cost of aircraft electrical service.