ISO16750-3-2012

【实例简介】
ISO16750-3-2012 Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 3: Mechanical loads Contents Page Foreword.............................................................................................................................................
Iso16750-3:2012[E Contents Page Foreword Scope 1 2 Normative references 1 Terms and definitions 4 Tests and requirements 4.1 ibration 4.2 Mechanical shock 27 4.3 Free fall… 29 4.4 Surface strength/ scratch and abrasion resistance 29 4.5 Gravel bombardment Code letters for mechanical loads 29 Documentation…,…………1111111 30 Annex A (informative) Guideline for the development of test profiles for vibration tests.32 Annex B (informative) Recommended mechanical requirements for equipment depending on the mounting location 44 Bibliography 46 C ISO 2012-All rights reserved Iso16750-3:2012E Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Internationa organizations, governmental and non-governmental, in liaison with ISO, also take part in the work Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization International Standards are drafted in accordance with the rules given in the ISo/IEC Directives, Part 2 The main task of technical committees is to prepare lnternational standards. draft International Standards adopted by the technical committees are circulated to the member bodies for voting ublication as an International Standard requires approval by at least 75 of the member bodies casting a vote Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights Iso 16750-3 was prepared by Technical Committee ISO/TC 22, Road vehicle, Subcommittee SC 3, Electrical and electronical equipment. This third edition cancels and replaces the second edition (Iso 16750-3: 2007), which has been technically revised ISo 16750 consists of the following parts, under the general title road vehicles-Environmental conditions and testing for electrical and electronic equipment: Part 1: General Part 2: electrical loads Part 3: Mechanical loads Part 4: Climatic loads Part 5: chemical loads o ISO 2012-All rights reserved INTERNATIONAL STANDARD Iso16750-3:2012(E) Road vehicles- Environmental conditions and testing for electrical and electronic equipment Part 3 Mechanical loads 1 Scope This part of IS0 16750 applies to electric and electronic systems/components for road vehicles. It describes the potential environmental stresses and specifies tests and requirements recommended for the specific mounting location on/in the vehicle This part of iso 16750 describes mechanical loads 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments applies. Iso16750-1, Road vehicles- Environmental conditions and testing forelectrical andelectronicequipment- Part 1: General IEC 60068-2, 6, Environmental testing- Part 2-6: Testing, Test Fc: Vibration Sinusoidal IEC60068-2, 14, Basicenvironmental testing procedures- Part 2-14: Tests-Test Nb: Change oftemperature TEC 60068-2, 64, Environmental testing Part 2-64: Test methods -Test Fh -Vibration, broad-band random(digital control)and guidance IEC 60068-2, 80, Environmental testing- Part 2-80: Tests- Test Fi: Vibration - Mixed mode testing IEC 60068-2-31, Environmental testing procedures- Part 2: Tests; Test Ec: Free fall, Clause 5.2 3 Terms and definitions For the purposes of this document, the terms and definitions given in Iso 16750-1 app 4 Tests and requirements 4.1 Vibration 41.1 General The vibration test metho ds specified consider various levels of vibration severities applicable to on- board electrical and electronic equipment. It is recommended that the vehicle manufacturer and supplier choose the test method, the environmental temperature and vibration parameters depending on the specific mounting location Following the expressions in MIL-STD please notice C ISO 2012-All rights reserved Iso16750-3:2012E When applied properly, the environmental management and engineering processes described in this part of Iso 16750 can be of enormous value in generating confidence in the environmental worthiness and overall durability. However, it is important to recognize that there are limitations inherent in laboratory testing that make itimperative to use proper caution and engineering judgement when extrapolating these laboratory results to results that may be obtained under actual service conditions. In many cases, real world environmental stresses (singularly orin combination cannot be duplicated practically or reliably in testlaboratories. Therefore, users of this part of Iso 16750 should not assume that a system or component that passes laboratory tests of this part of Iso 16750 would also pass field/ fleet verification trials The specified values are the best estimation one can get up to the moment when results from measurements in the car are received - but they do not replace a car measurement! The specified values apply to direct mounting in defined mounting locations. Using a bracket for mounting can resultin higher or lower loads. If the device under test ( DUT)is used in the vehicle with a bracket then all vibration and mechanical shock test shall be done with this bracket Carry out the vibration with the dut suitably mounted on a vibration table. The mounting method (s used shall be noted in the test report. Carry out the frequency variation by logarithmic sweeping of 0,5 octave/minute for sinusoidal tests and the sinusoidal part of sine on random tests. The scope of the recommended vibration tests is to avoid malfunctions and breakage mainly due to fatigue in the field Testing for wear has special requirements and is not covered in this part of ISo 16750 Loads outside of the designated test frequency ranges are to be considered separatel NOTE Deviations from the load on the DUT can result, should vibration testing be carried out according to this part of Iso 16750 on a heavy and bulky dut, as mounting rigidity and dynamic reaction on the vibrator table excitation are different compared to the situation in the vehicle. This deviation can be minimized by applying the average control method(see Annex A) Application of the weighted average control method according to IEC 60068-2, 64 is to be agreed upon Subject the dut during the vibration test to the temperature cycle according to iEC 60068-2, 14, with electric operation according to diagram 1. Alternatively, a test at constant temperature may be agreed on Operate the dutelectrically as indicatedin Figure l at Tmin(Short functional testafterthe dUT completely reached Tmin). This functional test shall be as short as possible- only long enough to check the proper performance of the dUt. This minimizes self-heating of the dUT. Additional electrical operation of the DUT between 210 min and 410 min of the cycle (see Figure 1) Additional drying of test chamber air is not permitted In the vehicle, vibration stress can occur together with extremely low or high temperatures; for this reason, this interaction between mechanical and temperature stress is simulated in the test, too. a failure mechanism is, for example, a plastic part of a system/component, which mellows due to the high temperature and cannot withstand the acceleration under this condition 2 o ISO 2012-All rights reserved Iso16750-3:2012[E Y max 20 a burditt 0 100 200 300 400 500 600 y Y temperature[°C] x time [ minI a Operating mode 3.2 according to ISo 16750-1. b Operating mode 2. 1 according to ISo 16750-1 One cycle Figure 1-Temperature profile for the vibration test Table 1- Temperature versus time for the vibration test Time Temperature min °C 0 20 60 40 150 -40 210 20 300 max 410 480 20 See Is016750-4 4.1.2 Tests 4.1.2.1 Test I- Passenger car, engine 4.1.2.1.1 Purpose This test checks the dUt for malfunctions and breakage caused by vibration The vibrations of a piston engine can be split up into two kinds: Sinusoidal vibration which results from the unbalanced mass forces in the cylinders and random noise due to all other vibration-schemes of an engine, C ISO 2012-All rights reserved 3 Iso16750-3:2012E e.g. closing of valves. In the lowest frequency range from 10 Hz to 100 Hz the influence of rough-road conditions is taken into account. The main failure to be identified by this test is breakage due to fatigue NOTE 1 Road profile usually has negligible impact on engine-mounted components. Shock inputs are effectively solated by suspension, and engine-mounting systems The test profiles specified in the following clauses apply to loads generated by(four stroke reciprocating engines NotE 2 If the dut is to be tested for a specific resonance effect, then a resonance dwell test according to 8.3.2 of IEC 60068-2, 6: 2007 can also be applied 4.12.1.2Test 4.1.2.1.2.1 General It is required to perform this test as a mixed mode vibration test according to IEC 60068-2, 80 NOTE The test duration is based on A 4. The temperature in the chamher is above room temperature (rt)at the end of the test (2 3/4 temperature cycles 4.1.2.1.2.2 Sinusoidal vibration Perform the test according to IEC 60068-2, 6, but using a sweep rate of s 0,5 octave/minute. Use a test duration of 22 h for each plane of the dUT Use curve l in Table 2/ Figure 2 for DUT intended for mounting on engines with 5 cylinders or fewer Use curve 2 in Table 2/Figure 2 for dUT test intended for mounting on engines with 6 cylinders or more Both curves may be combined to cover all engine types in one test 250 200 150 100 50 50100150200250300350400450500Ⅹ Key amplitude of acceleration [m/s2I X frequency [Hz curve1(≤5 cylinders) curve 2(5 cylinders Figure 2- Vibration severity curves 4 o ISO 2012-All rights reserved Iso16750-3:2012[E Table 2- values for max acceleration versus frequency Curve 1(see Figure 2 Frequency Amplitude of acceleration Hz 100 100 200 200 240 200 270 100 440 100 Curve 2(see Figure 2) Frequency Amplitude of acceleration H m/s2 100 100 150 150 440 150 Combination Frequency Amplitude of acceleration H 100 100 150 150 200 200 240 200 255 150 440 150 4,1.21.2.3 Random vibration Perform the test according to IEC 60068-2, 64. Use a test duration of 22 h for each plane of the DUT The r.m.s. acceleration value shall be 181 m/s2 The psd versus frequency are referred to in Figure 3 and Table 3 NoTE The Power Spectral Density(PSD)values (random vibration] are reduced in the frequency range of the sinusoidal vibration test C ISO 2012-All rights reserved 5 Iso16750-3:2012E Y 100 10 0,1 10 100 1000 10000 Key Y PSD [(m/s2)2/Hz X frequency [Hz] Figure 3- PSD of acceleration versus frequency Table 3- Values for frequency and PsD Frequency PSD H: (m/s2)2/Hz 10 10 100 10 300 0,51 500 20 2000 2 4.1.2.1.3 Requirement Breakage shall not occur. Functional status a see iso 16750-1) is required during operating mode 3.2 as defined in ISo 16750-1 and functional status C during periods with other operating modes 4.1.2.2 Test II-Passenger car, gearbox 4.1.2.2.1 Purpose This test checks the dut for malfunctions and breakage caused by vibration The vibrations of a gearbox can be split up into two kinds which result partly from sinusoidal vibration from unbalanced mass forces of the engine(e. g dominating orders) in the frequency range from 100 Hz to 440 Hz and vibration from the friction of the gear wheels and other schemes, which are tested in the random part. In the lowest frequency range from 10 Hz to 100 Hz the influence of rough-road conditions is taken into account The main failure to be identified by this test is breakage due to fatigue Changing the gears can create additional mechanical shock and shall be considered separatey brations The test profiles specified in the following subclauses apply to loads generated by gearbox vib o ISO 2012-All rights reserved 【实例截图】
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