1、 ISO 2017 Quasi-static calibration procedure for belt force transducers AMENDMENT 1 Procdure dtalonnage quasi-statique pour capteurs defforts pour ceintures AMENDEMENT 1 Reference number ISO/TS 17242:2014/Amd.1:2017(E) First edition 2014-05-01 AMENDMENT 1 2017-04 TECHNICAL SPECIFICATION ISO/TS 17242
2、 ISO/TS 17242:2014/Amd.1:2017(E)ii ISO 2017 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
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4、and Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/TS 17242:2014/Amd.1:2017(E) 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 n
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10、 information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: w w w . i s o .org/ iso/ foreword .html. Amendment 1 to ISO/TS 17242:2014 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3
11、6, Safety and impact tests. ISO 2017 All rights reserved iii Quasi-static calibration procedure for belt force transducers AMENDMENT 1 5.2 Replace the first sentence with the following: The sensor offset should be measured under no load condition. A new belt strap shall be inserted and mounted in th
12、e fixture 8) .5.3 Replace the third sentence with the following: Only one loading sequence with one belt strap per test transducer up to a force level at least at 100 % of the transducers calibration range shall be performed within the given velocity range.5.6 Replace the last item of the list with
13、the following: non-linearity as a percentage in % of the transducers calibration range (for linear regression only).Annex B Replace the entire Annex B with the following: Annex B (normative) Evaluation method B.1 Linear regression For the software linearization a least-squares fit method applied thr
14、ough the point of origin is used: The starting point of the linearized line is identical with the starting point of the measurement. This point is set to zero (point of origin). This measurement is independent of the defined evaluation interval (see 4.7). The resulting linear equation is (B.1) where
15、S 0 = 0;D = 0. ISO/TS 17242:2014/Amd.1:2017(E) ISO 2017 All rights reserved 1 ISO/TS 17242:2014/Amd.1:2017(E) For the linearization, the square sum of the difference between measured value and linearized value must be minimal: (B.2) where S i , F i= measured. The differentiation is equated to zero:
16、(B.3) From this will follow: (B.4) whereF is the actual force, in kN;S is the sensor output reading, in mV/V;D is the calculated offset (linear regression), in kN;a is the sensitivity, in mV/kN/V;b is the inverse sensitivity, in kN/mV/V; is the deviation. B.2 Polynomial regression For the polynomial
17、 approximation, a least-squares fit method shall be utilized to determine the polynomial coefficients A, B, C, and M. With mesh points (S i ; F i ) the third degree polynomial will acquire the general form: F i= AS i 3+ BS i 2+ CS i+ M (B.5) The function values F iare complemented by residues r i(co
18、rrections) F i+ r i= AS i 3+ BS i 2+ CS i+ M (B.6) Applied on the mesh points the observation formulae follow: (B.7) The observation formulae are squared and then pooled:2 ISO 2017 All rights reserved ISO/TS 17242:2014/Amd.1:2017(E) . . . T o determine the minimum of the residues r i , the observati
19、on formulas sum of squares are differentiated and equated to zero. . . . . A linear system of formulae results from putting in the mesh points (x i ; y i ). Coefficients A, B, C, and M, and therefore the equalization polynomial through the point of origin, can be calculated, whereF is the actual for
20、ce, in kN;S is the sensor output reading, in mV/V;M is the physical offset prior to the test (polynomial regression), in kN;A, B, C are the calibration coefficients.B is the inverse sensitivity, in kN/mV/V;C is the deviation.Annex C Replace the entire Annex C with the following: Annex C (informative
21、) Belt strap characteristics C . 1 S p e c i f i c a t i o n s f o r t h e s t a n d a r d i z e d c a l i b r a t i o n b e l t s t r a p For the calibration of the belt force transducers, a test belt strap with the specifications shown below should be utilized C.1.1 Construction ISO 2017 All right
22、s reserved 3 ISO/TS 17242:2014/Amd.1:2017(E) Normal band equal on both sides, bonding K2/2, double shot. C.1.2 Width 47 mm to 49 mm C.1.3 Thickness 1,25 mm to 1,35 mm C.1.4 Weight 64 g/m to 68 g/m C.1.5 Minimum breaking load 30 kN C.1.6 Strain 14 % to 16 % at 10 kN C.1.7 Colouring/Finishing Spin dyi
23、ng C.1.8 Number of chaining threads 300 10 C . 1. 9 N u m b e r o f f i l l i n g t h r e a d s 66 5 (1/100 mm) The belt strap shall be stored in a packed condition. Furthermore it should be protected from sunlight. NOTE If the recommended belt strap is not used, then the test belt strap which is in
24、 accordance with customer requirements is chosen. C.2 Measurement of test belt strap thickness For verification of significant belt strap characteristics, and to ensure traceability, the average thickness of the utilized belt strap lot should be identified. The average and the classification of the
25、belt strap shall be noted in the calibration report. Measurements of the test belt strap thickness are taken as follows. The test gauge should have a resolution of 0,01 mm and a maximum indication error of 3 %. The belt strap shall be measured between a planar overlay and a flat transceiver with a c
26、alibre of 10 mm within a test load of less than 2 N. The averaged belt strap thickness is calculated by three measurements on different points in the medium range of the belt strap. The minimum distance between these points should be 25 % of the overall tested belt strap length. If a belt strap char
27、ge is longer than 10 m, the average belt strap thickness should be identified once per each 10 m section.4 ISO 2017 All rights reserved ISO/TS 17242:2014/Amd.1:2017(E) Key 1 test gauge (0,01 mm resolution; 3 % error of indication) 2 overlay 3 transceiver (10 mm) 4 test belt strap a 25 % of width b medium range c minimum 25 % of test belt strap length d test belt strap length e point 3 f point 2 Figure C.2 Schematic measurement setup for the belt strap thickness ISO 2017 All rights reserved 5 ISO/TS 17242:2014/Amd.1:2017(E) ISO 2017 All rights reserved IC S 43.040.80 Price based on 5 pages
