Itis not intended to test equipment which forms part of the main structure. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply.
However, parties to agreements based on this International Standard are encouraged to investigate the possibil of applying the most recent editions of the normative documents indicated below.
For undated references, the latest edition of the normative document referred to applies. This is not intended to represent a full life test. However, the test conditions are sufficient to provide some reasonable degree of confidence that the equipment will survive the specified lite under service conditions.
Compliance with this standard is achieved providing no mechanical damage or deterioration in performance occurs as a result of these tests. The test levels quoted in this standard have been derived from environmental test data, as referred to in annex A. This information was submitted by organizations responsible for collecting environmental vibration levels under service conditions. The following tests are mandatory for compliance with this standard: Functional random These are the minimum test levels to be appli test levels to demonstrate that the equipment under test is capable of functioning when subjected to conditions which are likely to occur in service, on railway vehicles.
The degree of functioning shall be agreed between the manufacturer and the end user prior to tests commencing see 6. Functional test requirements are detailed in clause 8.
Simulated long life test levels This test is aimed at establishing the mechanical integrity of the equipment at increased service levels. It is not necessary to demonstrate ability to function under these conditions. Simulated long life testing requirements are detailed in clauses 9 and Shock testing Shock testing is aimed at simulating rare service events.
It is not necessary to demonstrate functionality during this test. These points shall be clearly demonstrated in the final test report. NOTE - Transportation and handling tests are not a requirement of this standard, and are therefore not included in this standard. The order of testing may be altered to minimize re-jigging.
The order of testing shall be recorded in the report. Performance tests in accordance with 6. The orientation and direction of excitation shall be stated in the test specification and included in the report.
Unless otherwise agreed itis preferred that the equipment shall be tested in its normal working orientation with no special precautions taken for the effects of magnetic interference, heat or any other factors, upon the operation and performance of the equipment under test.
Wherever possible, the fixture shall not have a resonance within the test frequency range. When resonances are unavoidable, the influence of the resonance on the performance of the equipment under test shall be studied and identified in the report.
If a part of the mounting structure is used as the fixture, the fixing points shall be taken as those of the mounting structure and not of the equipment under test. If four or less fixing points exist, each cone is defined as a control point.
The vibration at thse points shall not fail below the specified minimum limits. All control points shall be identified in the test report. In the case of small items of equipment where the size, weight and complexity of the mechanical structure do not merit multipoint control, the report shall identify how many control points were used and their locations. It may be a control point or a fictitious point created by manual or automatic processing of the signals from the control points.
For random vibration if a fictitious point is used, the spectrum of the reference signal is defined as the arithmetic mean at each frequency of the acceleration spectral density ASD values of the signals from all control points.
In this case, the total r. Total r. It is recommended that for large jous point is used. NOTE - Aviomatic processing of the signals trom the control points using a scanning technique to create the ficthious. However, it is not permitted for Confirmation of the ASD level without correcting for such sources of error as analyzer bandwidth, sampling time etc. This is done before commencing the tests detailed in this standard see clause 7. When more than one state exists, the equipment under test shall spend equal time in both states selected during vibration and shock testing; the levels of which are as specified ii clauses 8 and 10 respectively.
Functional tests are aimed to verify the operational capabili performance tests. They are only intended to demonstrat equipment under test will perform in service. Functional tests will not be conducted during shock testing unless previously agreed between the manufacturer and end user. NOTE 2 -In he case where the functional teste are modified, then these have to be detailed in the report.
The performance test specification shall be defined by the manufacturer and shall include tolerance limits. Nevertheless it is possible to make statements about the similarity of two random signals and set tolerance bands on their characteristics.
It is necessary to define a random signal in a way that ensures that, should the test be repeated at a later date, by a different test house or on a different item of equipment, then the excitation is of a similar severity.
It should be noted that all the following tolerance boundaries include instrumentation errors but exclude other errors, specifically random statistical errors and bias errors. The initial and final slope should not be less than those shown in figures 1 to 4. The r. In such cases it is only important forthe test value to be noted in the report. The 66 Recovery The initial and final measurements shall be taken under the same conditions for example, temperature. If necessary a period of time after testing and before the final measurements shall be allowed, in order to enable the equipment under test to attain the same conditions as existed for the initial measurements.
Where the nature of such testing is outside the physical capability of the test house, the tests shall be conducted by the manufacturer who shall provide a statement that the item under test conformed with the performance tests prior to the vibration and shock testing identified in this standard. It is the responsibility of the manufacturer to define the location of the response points which shall be clearly identified in the report. Transfer functions shall be calculated from the random signals taken from the reference point and response points, which shall be defined by the manufacturer.
Where panels are removed for examination or instrumentation, they shall be replaced during the testing. The transfer functions shall be taken under the test conditions specified in clause 8 for categories 2 and 3 equipment and in clause 9 for category 1 equipment. The measurement shall aim to achieve a coherence of at least 0,9. When the application orientation of equipment is unclear or unknown then the test shall bbe carried out in the three planes with the r. Table 1 - Test severity and frequency range for functional random vibration tests.
If during the course of testing over heating of equipment is felt to be a problem, i. However, it must be noted that the total duration of 5 h vibration shall be achieved. If tests are stopped then this shall be stated in the report. NOTE 1 - Itis not necessary for equipment to function during thi tes. Jement to reduce the amplitude of vibration. This is not a preferred ry 3 axle mounted equipment. Where the velocity change is determined by integration of the actual pulse shown, it shall be evaluated over the integration time interval shown in figure 6.
This test shall be repeated for each mechanical state as identified in 6. Transportation and handling Where transportation and handling tests are specifically requested by the end user, they shall be in accordance with IEC Owing to the nature of such testing, it may be outside the capability of the test house. In such cases, the tests will be conducted by the manufacturer who shall provide a statement that the item under test conformed with the performance tests after the vibration and shock testing identified in this standard.
Acceptance criteria On completion of ail the tests the equipment shall be considered acceptable for attestation of testing when the foliowing applies: a performance according to 6. The report shall describe the execution of the tests and their effect on the equipment together with: a the summary which shall identify changes which have occurred during the tests. The report shall contain all the control point graphs which shall be in the format of figures 1 to 6. NOTE - Whore special tests have boon carried out which exceed the requ included in tha report.
This attestation shall be signed by authorized representatives of the test house and the manufacturer. AMS value mv? NOTE 3 If frequencies above fare known to exist they may be included, the amplitude being estabished by extending ine 6 dBvoctave decayine unt Intreects the maximum irequency required. In such eases Mom. Long 20 ae ov 18 19 08 2s6 v. The third term is a quantity proportional to the integrated weight of all cycles participating in the fatigue process, assuming Rayleigh distribution of the SDOF system response amplitudes.
The second term represents the r. These normative references are cited at the appropriate places in the text and the publications are listed hereafter.
For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies including amendments.
It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. A Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical conumittee responsible, the identity of which can be found on the inside front cover.
This standard applies to single axis testing. However multi-axis testing may be used with prior agreement between the manufacturer and the customer. Class A Cubicles, subassemblies, equipment and components mounted directly on or under the car body. Class B Anything mounted inside an equipment case which is in turn mounted directly on or under the car body. Cubicles, subassemblies, equipment and components which are to be mounted on the bogie of a railway vehicle. Sub-assemblies, equipment and components or assemblies which are to be mounted on the wheel set assembly of a railway vehicle.
Please contact us for more information on how Keystone Compliance can assist you with identifying and fulfilling your EN needs. Request a Quote. Search for:. EN Testing EN specifies the requirements for testing items of equipment intended for use on railway vehicles which are subsequently subjected to vibrations and shock owing to the nature of railway operational environment.
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