6267 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION-MEXAYHAPOAHAR OPrAHW3AUWR nO CTAHAAPTW3AUNW-ORGANISATION INTE RNATIONALE DE NORMALISATION Alpine skis - Measurement of bending vibrations iSkis alpins -- Mesurage des vibrations en flexion First edition -- 1980-05-15 UDC 685.363.2 : 620.174.2 : 534.11 ISO 6267-1980 (E) Ref. No. 1SO 6267-1980 (E) Descriptors : sport equipment, alpine skis, tests, mechanical tests, bend tests, vibrations, measurement, test results. Price based on 2 pages ted without license from IHS Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 6267 was developed by Technical Committee ISO/TC 83, Sports and recreational equipment, and was circulated to the member bodies in March 1979. It has been approved by the member bodies of the following countries : Austria Italy Switzerland New Zealand USA Czechoslovakia Poland USSR France Germany, F. R. Romania South Africa, Rep. of India No member body expressed disapprovai of the document. @ International Organization for Standardization, 1980 Printed in Switzerland tted without license from IHS Not for Resale ISO 6267-1980 (E) INTERNATIONAL STANDARD Alpine skis - Measurement of bending vibrations 1 Scope and field of application 2.3 half life, t1/2: The time, in seconds, required for reduc- tion of the initial amplitude of vibration to half its value while This International Standard specifies a method for the deter- the ski vibrates. mination of the natural frequency and the half life of the bending vibrations of an alpine ski which is clamped in the 2.4 initial deflection : The deflection imposed on the ski at binding mounting area and can vibrate in the ski forebody. the start of test (i.e. 2,5 + g,5 mm), corresponding to amplitude ao on the vibration chart (see figure 2). It is applicable to skis having nominal lengths of 150 cm or more. 2.5 initial amplitude, a1 : The first amplitude which most closely corresponds to a 2 mm deflection of the ski at the measurement point. (The thirty succeeding vibrations are used 2 Definitions for the evaluation). For the purpose of this International Standard, the following definitions apply : Test apparatus 3 2.1 vibration period, T : The time, in seconds, between The test apparatus shall consist of a clamping device, a release two successive phases, for example vibration peaks, of a and an inductive displacement transducer (see figure 1). vibrating ski. Clamping device 3.1 2.2 natural frequency, : The number of vibrations per unit time of a vibrating ski. The clamping device shall have a mass of at least 100 kg, in order to avoid resonance effects, and shall comprise a vice hav NOTE -- The relationship between the natural frequency and the ing a flat jaw and three clamps, each of width 30 mm and vibration period is given by the formula covering the width of the ski, spaced at intervals of at least J= 1/T 150 mm. Dimensions in millimetres LN Release 2 ≥ 150 ≥ 150 300 > 30 200 max. 0 Measurement point Figure 1 - Test apparatus Copyright International Organization for Standardization Not for Resale e from IHS