BS EN ISO 7096:2000 pdf – Earth-moving machinery — Laboratory evaluation of operator seat vibration.
1? Scope 1.1? This International Standard specifies, in accordance with ISO 1 0326-1 , a laboratory method for measuring and evaluating the effectiveness of the seat suspension in reducing the vertical whole-body vibration transmitted to the operator of earth-moving machines at frequencies between 1 Hz and 20 Hz. It also specifies acceptance criteria for application to seats on different machines. 1.2? This International Standard is applicable to operator seats used on earth-moving machines as defined in ISO 61 65. 1.3? This International Standard defines the input spectral classes required for the following earth-moving machines. Each class defines a group of machines having similar vibration characteristics: ?? rigid frame dumpers > 4 500 kg operating mass 1 ? ?? articulated frame dumpers ?? scrapers without axle or frame suspension 2? ?? wheel-loaders > 4 500 kg operating mass 1 ) ?? graders ?? wheel-dozers ?? soil compactors (wheel type) ?? backhoe-loaders ?? crawler loaders ?? crawler-dozers u 50 000 kg operating mass 1 ), 3? ?? compact dumpers u 4 500 kg operating mass 1 ) ?? compact loaders u 4 500 kg operating mass 1 ) ?? skid-steer loaders u 4 500 kg operating mass 1 )
1.4? The following machines impart sufficiently low vertical vibration inputs at frequencies between 1 Hz and 20 Hz to the seat during operation that these seats do not require suspension for the attenuation of transmitted vibration: ?? excavators, including walking excavators and cable excavators 4? ?? trenchers ?? landfill compactors ?? non-vibratory rollers ?? milling machines ?? pipelayers ?? finishers ?? vibratory rollers 1.5? The tests and criteria defined in this International Standard are intended for operator seats used in earth- moving machines of conventional design. NOTE? Other tests may be appropriate for machines with design features that result in significantly different vibration characteristics. 1.6? Vibration which reaches the operator other than through his seat, for example that sensed by his feet on the platform or control pedals or by his hands on the steering-wheel, is not covered. 2? Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. 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 possibility 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. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 2041 :1 990, Vibration and shock — Vocabulary. ISO 2631 -1 :1 997, Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration — Part 1 : General requirements. ISO 601 6:1 998, Earth-moving machinery — Methods of measuring the masses of whole machines, their equipment and components. ISO 61 65:1 997, Earth-moving machinery — Basic types — Vocabulary.
3? Terms, definitions, symbols and abbreviations 3.1? Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 2041 and the following apply. 3.1.1 whole-body vibration vibration transmitted to the body as a whole through the buttocks of a seated operator 3.1.2 input spectral class machines having similar ride vibration characteristics at the seat attachment point, grouped by virtue of various mechanical characteristics 3.1.3 operating mass mass of the base machine with equipment and empty attachment as specified by the manufacturer, and with the operator (75 kg), full fuel tank and all fluid systems at the levels specified by the manufacturer [ISO 601 6:1 998, 3.2.1 ] 3.1.4 operator seat that portion of the machine provided for the purpose of supporting the buttocks and back of the seated operator, including any suspension system and other mechanisms provided (for example, for adjusting the seat position) 3.1.5 frequency analysis process of arriving at a quantitative description of a vibration amplitude as a function of frequency 3.1.6 measuring period time duration in which vibration data for analysis is obtained