NF EN ISO 7096

Dans la série des normes relatives aux engins de terrassement, le présent document aborde un aspect lié à la sécurité et à la santé des conducteurs. Il s'adresse particulièrement aux concepteurs des engins de terrassement et de sièges, ainsi qu'aux laboratoires susceptibles de contrôler le comportement dynamique des sièges.

<p><b>1.1</b> This document specifies, in accordance with ISO 10326‑1:2016, 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.</p> <p><b>1.2</b> This document is applicable to operator seats used on earth-moving machines as defined in ISO 6165.</p> <p><b>1.3</b> This document defines the input spectral classes required for the following earth-moving machines. Each class defines a group of machines having similar vibration characteristics:</p> <p>— rigid-frame dumpers &gt;4 500 kg operating mass;</p> <p>— articulated-frame dumpers;</p> <p>— scrapers without axle or frame suspension[1];</p> <p>— wheeled loaders &gt;4 500 kg operating mass;</p> <p>— graders;</p> <p>— wheeled dozers;</p> <p>— soil compactors;</p> <p>— backhoe loaders;</p> <p>— crawler dumpers;</p> <p>— crawler loaders;</p> <p>— crawler-dozers ≤50 000 kg operating mass[2];</p> <p>— compact dumpers ≤4 500 kg operating mass;</p> <p>— wheeled compact loaders ≤4 500 kg operating mass;</p> <p>— skid-steer loaders, wheeled ≤4 500 kg and tracked ≤6 000 kg operating mass.</p> <p><b>1.4</b> 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:</p> <p>— excavators, including walking excavators and cable excavators[3];</p> <p>— trenchers;</p> <p>— landfill compactors;</p> <p>— non-vibratory rollers, except soil compactors;</p> <p>— vibratory rollers, except soil compactors;</p> <p>— pipelayers;</p> <p>— horizontal directional drills (HDD).</p> <p><b>1.5</b> The tests and criteria defined in this document are intended for operator seats used in earth-moving machines of conventional design.</p> <p>NOTE Other tests can be appropriate for machines with design features that result in significantly different vibration characteristics.</p> <p><b>1.6</b> Vibration which reaches the operator other than through the seat, for example that sensed by the operator's feet on the platform or control pedals or by the operator´s hands on the steering-wheel, is not covered.</p> <p>[1] For scrapers with suspension, either a seat with no suspension can be used, or one having a suspension with high damping.</p> <p>[2] For crawler dozers greater than 50 000 kg, the seat performance requirements are suitably provided by a cushion type seat.</p> <p>[3] For excavators, the predominant vibration is generally in the fore and aft (X) axis.</p>