CAN CSA-M7096-2000 Earth-moving machinery - Laboratory evaluation of operator seat vibration (Second Edition General Instruction No 1 March 2000).pdf

1、National Standard of Canada CAN/CSA-M7096-00 CSA t N T E R N AT IO N A1 1 International Standard IS0 7096:1994 (second edition, 199410-01) has been adopted with Canadian deviations as CSA Standard CAN/CSA-M7096-00, which has been approved as a National Standard of Canada by the Standards Council of

2、Canada. ISBN 1-55324-049-9 March 2000 Earth-moving machinery - Laboratory evaluation of operator seat vibration Engins de terrassement - Evaluation en laboratoire des vibrations du siege de loperateur Reference number IS0 7096:1994(E) The Canadian Standards Association, which operates under the name

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17、e et anglaise. Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users to judge its suitability for their particular purpose. General Insfruction No. 1 CAN/CSA-M7096- 00 March 2000 Title: Operator seat

18、 - Trunsrnitted vibration - Mobile machinery (FM) Pagination: 13 pages (CSA/l, CSA/2, i, ii, and 9 text) For information aboui updates to this CSA publication, please complete and return the attached curd. Name Organization Add res Provi nce/State Country Postal/Zip Code CAN/CSA-M7096-00 Aff ranchir

19、 suff isa m men t Place Stamp Here /G, and the weighted rms acceleration measured on the platform (see tables 1 and 2, and figure2). The seats for all machines except wheel-loaders are tested according to one spectral class. Wheel-loaders generally perform two specific tasks (load and carry correspo

20、nding to driving, and short cycle correspond- ing to loading). Therefore, testing according to two spectral classes, II and Ill, shall be performed. See tables 2 and 3. 2 IS0 IS0 7096: 1994( E) 5.4.2 Damping test The seat shall be loaded with an inert mass of 75 kg and then be excited by a sinusoida

21、l vibration in the range from 0,5 Hz to 3 Hz. The inert mass shall if necessary be secured to the seat to prevent it from moving on the seat or falling off. The frequency range shall be investigated with either a constant frequency sweep from 0,5 Hz to 3 Hz and back again to 0,5 Hz or in steps of ma

22、ximum 0,05 Hz. The frequency sweeping shall be made dur- ing at least 80 s. The damping test and the calculation of the transmissibility at resonance shall be performed ac- cording to IS0 10326-1:1992, subclause 9.2. The frequency weighted root-mean-square (rrns) ac- celeration, LI,) for a vertical

23、input excitation corre- sponding to a constant displacement amplitude is defined as follows: for classes I, II and Ill: for class IV and for longitudinal excitation: 5.5 Tolerances on input vibration The input excitations applied to the seat, as defined in 5.4, can be produced on a simulator only wi

24、th a certain degree of approximation. The test shall satisfy the conditions in 5.5.1 to 5.5.3 in order to be accept- able. 5.5.1 Distribution function Use should be made of procedures having a Gaussian cumulative probability density, truncated at 3,5 times the standard deviation. 5.5.2 Normalized po

25、wer spectral density The power spectral density of the acceleration measured on the platform is considered to be representative of Gicf) if, and only if: ,n b) forff2: 0,08 for - - corrected magnitude on the seat surface; model of seat, product and serial number; date of test; h) transmissibility at

26、 the resonance during the damping test and the resonance frequency, or al- ternatively the transfer function with sinusoidal vibration input; time duration of run-in period, in hours; type of measuring disc used: semi-rigid, rigid; characteristics of the simulated input vibration test; i) j) identif

27、ication of test laboratory. the name of the person responsible for the test; 1 LP - 6- 1-f-s 1 1 +1,414S+S2 LP12 = S2 HP,2 = 1 + 1.414s + Sz 1 1 + 2,613s + 3,414s + 2,61 3S3 + S4 LP, = s4 HPz4 = 1 +- 2,613s + 3,41 4S2 + 2.61 3S3 + S4 where NOTE - HP and LP designate high-pass and low-pass filters of

28、 the Butterworth type. The subscripts state the filter slope in decibels per octave. This table defines band-pass filters completely in terms of cut-off frequencies and slopes. 4 1SO 7096:1994(E) Input vibration Go Class ( rn/s2)z/Hr I 4,155 3 II 2,410 2 II 2,410 2 Ill 0,764 6 Ill 0,764 6 IV 0,341 4

29、 Table 2 - Characteri! rms Weighted rms Frequency range to acceleration on acceleration on calculate a is the value corresponding to the short cycle type test. 6 Q IS0 IS0 7096:1994(E) Table 4 - Report form for damping test Machine on test: Axis of vibration: . . a;f) = . m/s2 . m/s2 aslfl) = . m/s2

30、 . Hz . NOTE - A graph of the frequency transfer function may also be provided. P tat form z Figure 1 - Posture of test person 7 IS0 7036:1934(E) 0 - 21 Y- - -n CJ 0,75 0,s 0,25 I 0 1 2 3 4 5 f.Hz 0 1 2 3 4 5 f,Hz fz = 4 HZ fl = 1 HZ f2 = 4 HZ fi = 1 HZ a) Class I b) CLass II 0 21 Q. - *P b 0.75 0.5

31、 0.25 20 f.Hz 0 5 10 15 20 f,Hz 0 5 10 15 fi = 1 HZ fz = 16 HZ fq = 3 Hz t2 = 18 HZ NOTE - The rms value is defined between the frequencies6 andf, (see 5.5.3). Figure 2 - Normalized power spectral density for classes I and II 8 Q IS0 IS0 7096:1994(E) 1 0.8 0.6 0.4 0.2 0.08 0 fl f2 Frequency, Hz Freq

32、uency at which G;If) = G,l Tolerance zone Figure 3 - Illustration of tolerances for normalized power spectral density of input vibration 9 Proposition de nuodifkation Nhesitez pas 2 nous faire part de vos suggestions et de vos commentaires. Prikre dutiliser le formulaire qui suit pour formuler les p

33、ropositions de modification aux normes CSA et autres publications CSA. I1 est recommand6 dinclure e numero de Ia norme/publication le num6ro de Iarticle, du tableau ou de la figure vise la formulation proposee la raison de cette modification. ProposaZ for change CSA welcomes your suggestions and com

34、ments. Please use the following form to submit your proposals for changes to CSA Standards and other CSA publications. Be sure to include the Standard/publication number relevant Clause, Table, and/or figure nu m ber(s) wording of the proposed change rationale for the change. Nom/Name: Affiliation: Adresse/Address: Ville/City: itat/Province/State: Pays/Coun t ry: Tel 53.100.00 Descriptors: earth-moving equipment, ergonomics, cabs, seats, operator seats, vibration, tests, laboratory tests, vibration tests, damping tests, test dummies. ISBN 1-55324-049-9