1、 Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandardsnavy.mil, with the subject line “Document Comment”. Since contact
2、 information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 5340 INCH-POUND MIL-PRF-32407 14 February 2012 SUPERSEDING MIL-M-17185A 27 August 1956 PERFORMANCE SPECIFICATION MOUNTS, RESILIENT (SU
3、RFACE SHIP APPLICATION) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope 6.4.8. This specification covers resilient mounts (see ) used to support mechanical or electrical equipment for use in surface ship applications internal to
4、 the hull. Mounts in accordance with this specification are considered only when mounts contained in S9073-A2-HBK-010, Installation and Inspection Information; Resilient Mount Handbook, cannot meet the requirements of a particular application. This specification is not approved for resilient mounts
5、used on submarines. For submarine applications, see 6.3. 1.2 Classification 6.2. The mounts covered by this specification are of the following types, as specified (see .b): a. Type I - This mount type has an elastomeric resilient element (see 6.4.11) designed primarily to support shipboard equipment
6、 and isolate vibration. Integral and/or auxiliary snubbers (see 6.4.12) are supplied as part of the mount to limit excursion of the resilient element due to shock or ship motion. Type I mounts rely on elastomers (see 6.4.4) in compression against metal to provide the strength necessary to restrain s
7、upported equipment. The resilient element and snubber encounter very little (if any) tension during shock or ship motion. The 5B5000H and EES series mounts are examples of Type I mounts; refer to S9073-A2-HBK-010. b. Type II - This mount type has a metallic resilient element and is primarily designe
8、d to support shipboard equipment and isolate shock. Type II mounts rely on the strength of a metallic resilient element to restrain mounted equipment during shock or ship motion. Elastomers are sometimes bonded to the metal of this mount type to fine-tune stiffness and provide damping. A high perfor
9、mance cable mount is an example of a Type II mount. c. Type III - This mount type integrates a Type I in series with a Type II mount to form a single Type III mount. Typically the Type I mount provides vibration isolation which snubs during shock allowing the Type II mount to provided. Type IV - Thi
10、s mount type has an elastomeric resilient element that is designed to support mounted equipment and primarily isolate shock and sometimes vibration. This mount type relies on the strength of the elastomeric resilient element to restrain mounted equipment during shock and ship motion. Typically the r
11、esilient element experiences a considerable amount of stress due to tension during shock. Type IV mounts are commonly referred to as elastomeric shock mounts. An arch mount is an example of a Type IV mount. shock isolation. Type III mounts incorporate all the inherent restraining features of Type I
12、and II mounts. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32407 2 2. APPLICABLE DOCUMENTS 2.1 General 3. The documents listed in this section are specified in sections , 4, or 5 of this specification. This section does not include docume
13、nts cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5
14、of this specification, whether or not they are listed. 2.2 Government documents2.2.1 . Specifications, standards, and handbooksDEPARTMENT OF DEFENSE SPECIFICATIONS . The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise s
15、pecified, the issues of these documents are those cited in the solicitation or contract. MIL-S-901 - Shock Tests, H. I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for MIL-DTL-1222 - Studs, Bolts, Screws and Nuts for Applications Where a High Degree of Reliability Is Requ
16、ired; General Specification for MIL-S-22698 - Steel Plate, Shapes and Bars, Weldable Ordinary Strength and Higher Strength: Structural MIL-PRF-23236 - Coating Systems for Ship Structures DEPARTMENT OF DEFENSE STANDARDS MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I Environmenta
17、l and Type II Internally Excited) MIL-STD-407 - Visual Inspection Guide for Rubber Molded Items (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or https:/assist.daps.dla.mil.) 2.3 Non-Government publicationsASTM INTERNATIONAL . The following documents form
18、a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM A36/A36M - Standard Specification for Carbon Structural Steel ASTM A105/A105M - Standard Specification for Carbon Steel Forgings for
19、 Piping Applications ASTM A515/A515M - Standard Specification for Pressure Vessel Plates, Carbon Steel, for Intermediate- and Higher-Temperature Service ASTM A516/A516M - Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service ASTM A675/A675M - St
20、andard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Properties ASTM B117 - Standard Practice for Operating Salt Spray (Fog) Apparatus ASTM B138/B138M - Standard Specification for Manganese Bronze Rod, Bar, and Shapes ASTM D395 - Standard Test Methods for Rubber Prop
21、erty - Compression Set Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32407 3 ASTM D412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers - Tension ASTM D429 - Standard Test Methods for Rubber Property - Adhesion to
22、Rigid Substrates ASTM D471 - Standard Test Method for Rubber Property - Effect of Liquids ASTM D573 - Standard Test Method for Rubber - Deterioration in an Air Oven ASTM D792 - Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement ASTM D1005 - Standard
23、 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers ASTM D1141 - Standard Practice for the Preparation of Substitute Ocean Water ASTM D1149 - Standard Test Methods for Rubber Deterioration - Cracking in an Ozone Controlled Environment ASTM D2240 - Standard Test M
24、ethod for Rubber Property - Durometer Hardness ASTM D2632 - Standard Test Method for Rubber Property - Resilience by Vertical Rebound ASTM D5992 - Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods ASTM D7091 - Standard Practice for Nondestructi
25、ve Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals (Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., P.O. Box C700, West Conshohocken, PA 19428-2959 or onlin
26、e at www.astm.org.) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 10846-1 - Acoustics and Vibration Laboratory Measurement of Vibro-Acoustic Transfer Properties of Resilient Elements - Part 1: Principles and Guidelines ISO 10846-2 - Acoustics and Vibration Laboratory Measurement of Vibro-
27、Acoustic Transfer Properties of Resilient Elements - Part 2: Direct Method for Determination of the Dynamic Stiffness of Resilient Supports for Translatory Motion ISO 10846-3 - Acoustics and Vibration Laboratory Measurement of Vibro-Acoustic Transfer Properties of Resilient Elements - Part 3: Indire
28、ct Method for Determination of the Dynamic Stiffness of Resilient Supports for Translatory Motion (Copies of these documents are available from ISO, 1, rue de Varemb, CH-1211 Geneva 20, Switzerland or online at www.iso.org.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract,
29、in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo repro
30、duction or networking permitted without license from IHS-,-,-MIL-PRF-32407 4 3. REQUIREMENTS 3.1 First article 6.2. When specified (see .c), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 General design requirements3.2.1 . Service life 6.2. Unless otherwise speci
31、fied (see .d), mounts shall be designed to provide a minimum service life of 18 years for mount Types I, II, and III and 12 years for mount Type IV. Mount service life shall be determined from the time the mount is installed and loaded onboard ship and shall include any effects from a prior minimum
32、storage of 7 years for mount Types I, II, and III and 5 years for mount Type IV (see 5.1). In-service environment and age-related changes in the physical properties of mount materials shall be considered. Worst-case manufacturing tolerance (dimensions and performance) shall be taken into considerati
33、on when determining service life. In addition to manufacturer analysis of in-house design data, such as fatigue life of the resilient element, results from first article tests shall be used to support a service life determination. Failure to meet any of the following criteria denotes end-of-service
34、life: a. For all mount types required to isolate vibration (see 6.2.b), dynamic stiffness shall not increase by more than 2 times the initial stiffness while in-service or by more than 30 percent during the first 5 years of service. Compliance shall be determined by evaluating changes in elastomer p
35、roperties and mount geometry with time. Include an assessment of the change in dynamic stiffness due to mount drift (see 3.2.5, 3.4.5.4, and 6.4.1). b. Mount Types II, III, and IV shall provide sufficient shock isolation during their service life, allowing no more than the maximum acceleration speci
36、fied (see 3.4.8.1) to be experienced on mounted equipment during shock. If a maximum acceleration is not specified, no more than a nominal 20 percent increase in acceleration levels is permitted on mounted equipment during shock. Compliance shall be determined by evaluating the time required for an
37、unacceptable decrease in shock isolation capability due to changes in material properties and mount height with time. Include an evaluation of available shock excursion in the compressive normal (see 6.4.10) direction due to mount drift (see 3.2.5 and 3.4.8). c. Snubber gaps for mount Types I and II
38、I shall remain within their required clearance throughout the mount service life. Compliance shall be determined by evaluating the time required for snubber gaps to drift outside their required clearance. Include an assessment of in-service snubber gap clearance using extrapolated drift data (see 3.
39、2.5 and 3.2.6). d. All mount types shall not have age-related deterioration that may permit damage leading to failure during shock or ship motion during their service life. In addition, mounts shall not have a loss of stiffness which permits the maximum design excursion (see 6.4.7) or maximum permis
40、sible mount deflection (when specified, see 3.4.7.2 and 3.4.8.1) to be exceeded during shock or ship motion. Compliance shall be determined by evaluating changes in the resilient element properties over time with regard to endurance and shock requirements (see 3.4.7 and 3.4.8). e. For mount Types II
41、, III, and IV, the maximum permissible drift (when specified, see 3.2.5) shall not be exceeded during the mounts service life. Compliance shall be determined by evaluating drift data (see 3.2.5). 3.2.2 Captive feature requirements3.2.2.1 . Shipboard mounting systems shall have captive features that
42、limit the excursion of mounted equipment and prevent the equipment from becoming adrift in any direction should the elastomeric resilient element of the mount fail during normal operation or non-routine event. Type I mounts 3.2.2. Type I mounts shall incorporate in their design captive features that
43、 comply with . The captive feature can include auxiliary snubbers supplied as part of the mount. Captive feature components shall be constructed of metal and only use elastomeric elements in compression to cushion impact due to shock and ship motion. The required strength of the captive feature shal
44、l be dictated by the shock, static strength, and endurance requirements contained in this specification (see 3.4.3, 3.4.7.2, and 3.4.8). 3.2.2.2 Type II mounts3.4.3. Type II mounts are inherently captive since they utilize a metallic resilient element to support shipboard equipment. The required str
45、ength of the mount shall be dictated by the shock, static strength, and endurance requirements contained in this specification (see , 3.4.7, and 3.4.8). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-32407 5 3.2.2.3 Type III mounts3.4.3. Typ
46、e III mounts shall incorporate all the captive features of a Type I mount integrated with the inherently captive Type II mount. The required strength of the mounts captive feature shall be dictated by the shock, static strength, and endurance requirements contained in this specification (see , 3.4.7
47、, and 3.4.8). 3.2.2.4 Type IV mounts3.2.2. These mounts typically do not have captive features as part of their design. It is the responsibility of the mounting system designer to incorporate captive features that comply with as part of the shipboard mounting system (see 6.7). Requirements allowing
48、for mounts to interface with captive feature components shall be as specified see 6.2.e.(1). 3.2.3 Component parts4.3.3.1. Mounts shall be serviceable and designed for easy inspection. The use of internal load bearing elements such as pins or dowels should be avoided in mount construction. Mounts sh
49、ould be designed so they do not collect liquids or debris (as practical). Compliance shall be verified by inspection (see ). 3.2.4 Metal-to-metal contact4.3.3.1. Mounts shall be designed so there is no rigid metal-to-metal contact between components when captive features are engaged. Compliance shall be verified by inspection (see ) and to the satisfaction of examination requirements (3.4.1.4.1) when testing finished mounts. 3.2.5 Drift4.4.2.6. The mount design
