1、DEPARTMENT OF DEFENSEHANDBOOKMASS PROPERTIES CONTROL FOR SPACEVEHICLESThis handbook is for guidance only.Do not cite this document as a requirementAMSC N/A FSC 1810NOT MEASUREMENTSENSITIVEMIL-HDBK-181112 August 1998SUPERSEDINGMIL-STD-181102 April 1992Provided by IHSNot for ResaleNo reproduction or n
2、etworking permitted without license from IHS-,-,-MIL-HDBK-1811iiFOREWORDThis handbook is approved for use by all Departments and Agencies of the Departmentof Defense. This handbook replaces MIL-STD-1811, 02 April 92, Mass Properties Control ForSpace VehiclesThis handbook is for guidance only. This h
3、andbook should not be cited as arequirement. If it is cited as a requirement, the contractor is not compelled to comply.This handbook is intended for use in preparing acquisition and study contracts forselected space systems and space vehicles. The handbook should be used to determine massproperties
4、 control requirements to be cited in the contract statement of work as appropriate tothe acquisition. Additional guidance may be found in the Mass Properties CPAT and the GuideSpecification Space System documents.The handbook may also be used by the contractors mass properties managers andengineers
5、to provide guidance in developing and implementing a sound mass propertiescontrol program for space vehicles.Beneficial comments (recommendations, additions, deletions) and any pertinent datawhich may be of use in improving this document should be addressed to:SMC/AXMP160 Skynet Street Suite 2315Los
6、 Angeles Air Force BaseEl Segundo, CA 90245-4683by using the self-addressed Standardization Document Improvement Proposal (DD Form1426) appearing at the end of this document or by letter.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-1811ii
7、iCONTENTSPAGE1 SCOPE 11.1 Purpose 11.2 Application 12 APPLICABLE DOCUMENTS . 12.1 General 12.2 Government documents . 12.2.1 Specifications, standards, handbooks 12.3 Order of precedence 13 DEFINITIONS 23.1 Mass properties 23.2 Basic mass properties 23.3 Weight growth allowance . 23.3.1 In-scope Cha
8、nges 23.3.2 Out-of-scope Changes . 23.4 Predicted mass properties 24 GENERAL REQUIREMENTS 24.1 Control program . 24.2 Determination . 35 DETAIL REQUIREMENTS 35.1 Control program . 35.1.1 Mass Properties Control Plan . 35.1.2 Subcontractor Mass Properties Control 35.1.3 Associate Design Activity and
9、GFE Suppliers Interfaces . 35.1.4 Management Participation . 35.1.4 Management Participation . 35.1.5 Mass Properties Limits . 35.1.6 Weight Growth . 35.1.7 Basic Mass Properties 45.1.8 Limit Monitoring 45.1.9 Corrective Action. . 45.1.10 Document Release . 45.2 Determination . 45.2.1 Changes . 45.2
10、.2 Sequential Mass Properties 45.2.3 Ground Operations Support . 55.2.4 Postflight Analysis 55.2.5 Trade Studies . 55.2.6 Mass Properties Uncertainties Analyses 55.2.6.1 Requirements for Uncertainty Analyses . 55.2.6.2 Contents 55.2.7 Verification. 55.2.7.1 Requirements 55.2.7.2 Procedures 65.2.7.3
11、Notification of Measurement 65.2.7.4 Test Conditions 65.2.7.5 Data Records . 65.2.8 Data Organization 6Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-1811iv5.2.8.1 Functional Organizations . 65.2.8.3 Government Furnished Equipment 65.2.8.5
12、Basis of Mass Properties . 75.3 D ocumentation S ummary . 75.3.1 Mass Properties Control Plan . 75.3.2 Verification Plan . 75.3.3 Status Report . 75.3.3.1 Mass Properties Summary . 75.3.3.2 Mass Properties Limit Monitoring . 75.3.3.3 Changes 85.3.3.4 Potential Changes . 85.3.3.5 Sequential Mass Prop
13、erties . 85.3.3.6 Government Furnished Equipment 85.3.3.7 Reference Axes . 85.3.3.8 Weight Growth . 85.3.4 Detail Mass Properties . 85.3.4.1 Detail Weight Statement 85.3.5 Miscellaneous Mass Properties Report 86 NOTES 96.1 Intended use 96.2 Subject term (key word) listing . 96.3 Supersession data. 9
14、APPENDIX A -MASS PROPERTIES VERIFICATION PLAN 10APPENDIX B -FUNCTIONAL BREAKDOWN OF WEIGHT . 13TABLE B-I -SAMPLE (SATELLITE) . 15TABLE B-II -SAMPLE (LIQUID PROPULSION STAGE) . 16TABLE B-III -COMPREHENSIVE SAMPLE (REENTRY SYSTEM) 17APPENDIX C -DESIGN DATA 55APPENDIX D -WEIGHT CHANGE CODES 66APPENDIX
15、E -EDITED MIL-M-38310 FOR HANDBOOK . 67.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-181111 SCOPE - This handbook provides guidance for establishing uniform procedures for thecontrol, determination, and documentation of mass properties of
16、 space vehicles and theirsubsystems and components.1.1 Purpose . The general purpose of this handbook is to describe terminology,processes and procedures for developing sound mass properties engineering practices. Thishandbook is derived from the applicable documents Reference s 1 and 2 . Reference
17、1 hasbeen incorporated into the main body of this handbook. Reference 2 was modified andincorporated as Appendix E. As such, the handbook contains some sections which areapplicable primarily to United States Government space vehicle development and acquisitionprograms. Other sections are more genera
18、l in nature, describing terminology, processes, andprocedures which are generally accepted in the industry, and reflect sound mass propertiesengineering practices in the development and production of space vehicles. Its applicabilitymay therefore be extended to commercial contracts and company inter
19、nal space vehicledevelopment programs as deemed appropriate. An industry standard, incorporating the intentof Reference 1,has been developed and maintained by the Society of Allied Weight Engineers(S.A.W.E.) as a recommended practice (Reference 4 of applicable documents).1.2 Application . This handb
20、ook is intended for use in acquisition and study contractsfor selected space systems and space vehicles. This handbook may also be used as areference document to specify mass properties control requirements for upper stage vehicles,injection stages, satellite payloads, reentry vehicles, launch vehic
21、les, ballistic vehicles, or forother vehicles. For these applications the term “space vehicle” is to be interpreted as theapplicable vehicle.2 APPLICABLE DOCUMENTS2.1 General . The documents listed below are not necessarily all of the documentsreferenced herein, but are the ones that are needed in o
22、rder to fully understand theinformation provided in this handbook.1. MIL-STD-1811 (USAF) “Military Standard - Mass Properties Control for SpaceVehicles”, 12 August 1991 .2. MIL-M-38310B (USAF), Amendment 2 “Military Specification - Mass PropertiesControl Requirements for Missile and Space Vehicles”,
23、 15 June 1974 .3. SAWE Recommended Practice No. 6 Issue No. 1 dated 3 January 1995 .4. SAWE Recommended Practice No. 11 Revision A, dated 20 May 1997.2.2 Government documents .2.2.1 Specifications, standards, handbooks . The following specifications, standards,and handbooks form a part of this docum
24、ent to the extent specified herein. Unless otherwisespecified, the issues of these documents are those listed in the issue of the Department ofDefense Index of Specifications and Standards (DoDISS) and supplements thereto, cited inthe solicitation.2.3 Order of precedence . In the event of a conflict
25、 between the text of this documentand the references cited herein, the text of this document takes precedence. Nothing in thisProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-18112document, however, supersedes applicable laws and regulations
26、unless a specific exemptionhas been obtained.3 DEFINITIONS3.1 Mass properties . The mass properties of an item include the items weight (ormass), center of gravity (or center of mass), mass moments of inertia, and mass products ofinertia.3.2 Basic mass properties . The basic mass properties of an it
27、em are the massproperties data based on an assessment of the most recent baseline design. This designassessment includes the estimated, calculated, or measured mass properties, and alsoincludes an estimate for undefined design details. The weight growth allowance anduncertainties are not included.3.
28、3 Weight growth allowance . The weight growth allowance is the predicted change tothe mass properties of an item based on an assessment of the design and fabrication status ofthe item, and an estimate of the design changes that may still occur. The design changes thatmay occur can be both in-scope a
29、nd out-of-scope.3.3.1 In-scope Changes . In-scope design changes are changes that may beimplemented by the contractor to meet design requirements. The weight growth allowanceassociated with in-scope design changes provides for the lack of design maturity.3.3.2 Out-of-scope Changes . Out-of-scope des
30、ign changes are changes that areout-of-scope with respect to the current contract baseline, but for any number of reasons maybe considered in the future. The weight growth allowance associated with undefinitized out-of-scope design changes are based entirely on past program experience and are very d
31、ifficult topredict. At the direction of the customer, the weight growth allowance for undefinitized out-of-scope design changes may be omitted. Definitized proposed changes are out-of-scope untilthe changes are authorized by an official contract change. The weight growth associated witha definitized
32、 proposed change is based on the proposed change.3.4 Predicted mass properties . The predicted mass properties of an item are thecurrent mass properties plus the weight growth allowance.4 GENERAL REQUIREMENTS4.1 Control program . The mass properties control program for space vehicles shouldbe in acc
33、ordance with the requirements of this handbook. The contractor should implementand maintain the mass properties control program with the objective of meeting the spacevehicle mass properties requirements. Qualified personnel should be assigned theresponsibility and authority to assure the establishm
34、ent and maintenance of mass propertiesobjectives and the effective planning and execution of mass properties control functions. Theprogram level of effort should be adequate to determine, control, and document the massproperties of the space vehicle , subsystems, and components. The mass properties
35、controlprogram includes all subcontractor items, associate contractor items, Government FurnishedEquipment (GFE) items, as well as contractor furnished items. Additional guidance can befound in Appendix E.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
36、-,-MIL-HDBK-181134.2 Determination . The space vehicle mass properties should be determined asrequired for all analyses requiring mass properties data such as performance analyses,stability and control analyses, and structural dynamic and loads analyses.5 DETAIL REQUIREMENTS5.1 Control program .5.1.
37、1 Mass Properties Control Plan . The contractor should develop and implement amass properties control plan. The objective of this plan should be to formulate an organizedweight control program that can be effectively implemented early in the contract period to meetthe space vehicle mass properties r
38、equirements.5.1.2 Subcontractor Mass Properties Control . The contractor should be responsiblefor the mass properties control of each subcontractor and vendor. In each procurementdocument for items which may significantly affect the space vehicle mass properties, a massproperties control section sho
39、uld be included to impose the applicable requirements on thesubcontractor or vendor.5.1.3 Associate Design Activity and GFE Suppliers Interfaces . Associate DesignActivities and Government Furnished Equipment (GFE) Suppliers should be responsible for theinterchange of sufficient mass properties data
40、 to support the integration of sub-unit massproperties into the complete unit mass properties. They should respond promptly to requestsfrom the interfacing and integrating contractors for information required by the contractors insatisfaction of contractual requirements.5.1.4 Management Participatio
41、n . High-level management should participate in thedevelopment and maintenance of the mass properties control program. Effectiveness of massproperties control efforts has historically been found to be proportional to the directparticipation of high-level management. High-level management emphasis on
42、 weight controlencourages designers to consider the trade-off of light weight design and design and/orperformance margins.5.1.5 Mass Properties Limits . The contractor should determine and document themass properties limits . The mass properties limits should include those established by system,subs
43、ystem, and component performance, as well as design requirements and the massproperties limits established by contract.5.1.6 Weight Growth . The contractor should include in the weight data an allowancefor the expected weight growth . The weight growth allowance may be depleted from thebeginning to
44、the end of the contract according to an approved plan. Weight growthallowances should be identified in the contractors mass properties records.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-181145.1.7 Basic Mass Properties . The contractors
45、 space vehicle mass propertiesdatabase should be kept current by periodic updating using the most recent information fromdesign data, drawings, mass properties measurements, GFE data, associate contractors,subcontractors, and vendors. These data should be updated frequently in the earlydevelopments
46、phase; once per week is recommended. Less frequent updating is acceptablelate in the development phase when mass properties changes are small; once per month is arecommended minimum. More frequent updating may be required during launch preparation.The contractors selection of updating frequency is s
47、ubject to the approval of the contractingofficer. The updating frequency is not necessarily related to the frequency of submittingcontractually required mass properties reports.5.1.8 Limit Monitoring . The contractor should maintain a documented comparison ofthe predicted mass properties (See 3.4) a
48、nd the limits discussed in 5.1.5. The comparisonshould identify the current weight growth allowance. Mass properties uncertainties should alsobe included and identified.5.1.9 Corrective Action . The contracting officer should be notified immediately whenthe mass properties limits described in paragraph 5.1.5 are equaled or exceeded. Thecontractor should advise the contracting officer of the resulting effects on system performanceand recommend corrective action.5.1.10 Document Release . Documents controlling the design, manufacture, andprocur
