<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jones, D L</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">740. Dynamic Balance Error Terms for Rotating Aerospace Vehicles</style></title><secondary-title><style face="normal" font="default" size="100%">28th Annual Conference, San Francisco, California, May 5-8</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">06. Inertia Measurements</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1969</style></year><pub-dates><date><style  face="normal" font="default" size="100%">5/5/69</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sawe.org/store/product_info.php?products_id=40109</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Society of Allied Weight Engineers, Inc.</style></publisher><pub-location><style face="normal" font="default" size="100%">San Francisco, California</style></pub-location><pages><style face="normal" font="default" size="100%">29</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Rotating aerospace vehicles are usually balanced as a rotor on a dynamic balance machine to determine the position of their principal axes.  This paper discusses the error terms in principal axis location that can exist between a rotor on the machine and a free body in space.

The mass properties of a rigid body are defined with respect to a reference system and with respect to a free body.  Methods for expressing principal axis location are presented.  Several sets of units that can be used are described.

 The error terms in using a balance machine to locate the principal axis are discussed.  Two types of vertical balance machines are included - two-transducer single-speed and single-transducer two-speed.  The machine related errors include machine residual unbalance, induced effects of residual static unbalance, and effects of test article vibration.  The effects of non-ideal structural reference systems are discussed.  The effects of ambient air are divided into velocity-dependent terms and acceleration-dependent terms.  The added mass of air is included in the acceleration-dependent terms. Elastic effects are caused by internal deflections under centrifugal loads.  These effects can be important for single-transducer two-speed machines.  Other error terms, including configuration changes, are briefly discussed.

The conclusion presents some guides for making error analyses and for selecting the type of balance machine.
</style></abstract><work-type><style face="normal" font="default" size="100%">6. INERTIA MEASUREMENTS</style></work-type><accession-num><style face="normal" font="default" size="100%">0740</style></accession-num><custom1><style face="normal" font="default" size="100%">Non-Member Price: $18.27. Members may download this paper for free. &lt;a href=&quot;http://www.sawe.org/dms&quot;&gt;Click here&lt;/a&gt;. (Login Required. See SAWE &lt;a href=&quot;http://www.sawe.org/faq&quot;&gt;Frequently Asked Questions&lt;/a&gt;.)</style></custom1></record></records></xml>