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SEAT coefficient for instantaneous peak accelerations on selected segments for individual axes at 10-second segments and at the highest point
| Segment number | X Axis | Y Axis | Z Axis | |
|---|---|---|---|---|
| SEAT factor (10 second segment) | Segment 1 | 1,5 | 1,0 | 1,2 |
| Segment 2 | 1,1 | 1,2 | 1,1 | |
| SEAT ratio at the highest point | Segment 1 | 1,6 | 1,0 | 1,1 |
| Segment 2 | 1,3 | 0,8 | 1,3 |
Physical and mechanical parameters of distance knitted fabrics
| Thickness, mm | Areal density, g/m2 | Stiffness compression module, kPa | Material | |
|---|---|---|---|---|
| W1 | 16.94 | 642 | 31.54 | polyester |
| W2 | 15.22 | 786 | 56.37 | polyester |
| W3 | 14.43 | 661 | 41.57 | polyester |
| W4 | 7.98 | 743 | 111.34 | polyester |
| W5 | 8.18 | 489 | 29.46 | polyester |
| W6 | 6.30 | 446 | 83.42 | polyester |
| W7 | 5.30 | 400 | 117.82 | polyester |
Anthropometric measurements of the human body
| Nr. | Body Measurements | Measurement, 10−3m |
|---|---|---|
| 1 | Hip Circumference | 346 |
| 2 | Thigh length from rise to knee level | 472 |
| 3 | Sciatic bone length finishing at buttock level | 134.3 |
| 4 | Length from the middle of knee to the end of the buttock | 606.3 |
| 5 | Length from the knee level to the end of the buttock | 646 |
| 6 | Length from the middle of the knee to the end of the knee | 39.7 |
| 7 | Length from the floor to hip level (hip height) | 99.4 |
| 8 | Length from the floor to knee level (knee height) | 52,2 |
| 9 | Knee height; middle of knee height | 108; 54 |
| 10 | Tibia length from ankle to knee level | 429 |
| 11 | Length from the floor to the knee bentat 95° | 466 |
Average RMS values and the calculated SEAT damping coefficient for individual components X, Y, Z
| Average value RMS (X) | Average value RMS (Y) | Average value RMS (Z) | |
|---|---|---|---|
| Sample Zero - Mean | 1.146 m/s2 | 0.625 m/s2 | 2.130 m/s2 |
| Medium sample | 0.765 m/s2 | 0.626 m/s2 | 2.053 m/s2 |
| SEAT coefficient for the prototype seat | 1.499 | 1.000 | 1.000 |
The type of disease depends on the frequency of vibrations [1]
| Activity | Disease | Frequency, Hz |
|---|---|---|
| All | Labyrinth disorders | 5 – 15 |
| Operator of a construction machine | Bone lesions, vascular neurosis | 70 – 200 |
| Driver of an agricultural tractor | Changes along the spine within the intervertebral joints | 6 – 12 |
| Operator of a manual mechanical tool, e.g. a hammer drill | Osteoarticular changes | 10 – 130 |
| Truck driver | Nerve vascular disease | 40 – 260 |
| Operator of a machine for whipping the ground | Abnormalities in the circulatory system | above 30 |
| Operator of an orbital sander | Disorders in the muscular system | 50 |
| Operator of a pneumatic hammer | Paroxysmal finger skin whitening | above 30 |
| Helicopter pilot | Weakness of vision, blurred vision | 18 |
| Machine operator for excavation and drilling | Angioneurotic problems Raynaud syndrome Keratosis of the skin Sensation problem | 40 – 300 |
List of detailed dimensions of the Melex test vehicle
| Parameter | Dimension in, 10−3m | |
|---|---|---|
| MELEX vehicle dimensions | Length of melex | 2500 |
| Width of melex | 1600 | |
| Height of melex | 1280 | |
| Length of seat | 1100 –for 2 people; 530 –for 1 person | |
| Distance from floor to the seat (seat height) | 360 | |
| Distance from seat to the inside back of seat | 250 | |
| Seat dimensions | Width of seat | 530 |
| Length of inside back of seat | 490 | |
| Width of inside back of seat | 460 |
List of standards for testing vibrations transmitted by the chair onto the human body in real conditions [23,24]
| Norm | Norm name |
|---|---|
| ISO 2631 – 1:1997 | Mechanical vibrations and shocks - assessment of human exposure to whole body vibration - part 1: General requirements |
| ISO 8041 - 2005 | Human reaction to vibrations - measuring instrumentation |
Linear density of component yarns of spacer knitted fabrics
| Code of yarn | Yarn 1 | Yarn 2 | Yarn 3 | Yarn 4 | Yarn 5 | Yarn 6 |
|---|---|---|---|---|---|---|
| linear density of mass | tex | tex | tex | tex | tex | tex |
| W1 | 167 | 167 | 434 | 434 | 167 | 167 |
| W2 | 167 | 167 | 677 | 677 | 167 | 167 |
| W3 | 167 | 167 | 677 | 677 | 167 | 167 |
| W4 | 111 | 111 | 50 | 50 | 111 | 111 |
| W5 | 111 | 111 | 50 | 50 | 111 | 111 |
| W6 | 111 | 111 | 50 | 50 | 111 | 111 |
| W7 | 111 | 111 | 50 | 50 | 111 | 111 |