Thorax Sample Clauses

Thorax. 2.5.1. The thorax is shown as part No. 4 in Figure l of this annex. 2.5.2. The thorax consists of a rigid thoracic spine box and three identical rib modules. 2.5.3. The thoracic spine box (part No. 4a) is made of steel. On the rear surface a steel spacer and curved, polyurethane (PU)-resin, back plate is mounted (part No. 4b). 2.5.4. The top surface of the thoracic spine box is inclined 5° backwards. 2.5.5. At the lower side of the spine box a T12 load cell or load cell replacement (part No. 4j) is mounted. 2.5.6. A rib module (part No. 4c) consists of a steel rib bow covered by a flesh- simulating open-cell polyurethane (PU) foam (part No. 4d), a linear guide system assembly (part No. 4e) linking the rib and spine box together, a hydraulic damper (part No. 4f) and a stiff damper spring (part No. 4g). 2.5.7. The linear guide system (part No. 4e) allows the sensitive rib side of the rib bow (part No. 4d) to deflect with respect to the spine box (part No. 4a) and the non-sensitive side. The guide system assembly is equipped with linear needle bearings. 2.5.8. A tuning spring is located in the guide system assembly (part No. 4h). 2.5.9. A rib displacement transducer (part No. 4i) can be installed on the spine box mounted part of guide system (part No. 4e) and connected to the outer end of the guide system at the sensitive side of the rib.

Thorax. 2.5.1. The thorax is shown as part No. 5 in figure l of this annex. 2.5.2. The thorax consists of a rigid thoracic spine box and three identical rib modules. 2.5.3. The thoracic spine box (part No. 5a) is made of steel. On the rear surface a lead-filled plastic back plate is mounted (part No. 5b). 2.5.4. The top surface of the thoracic spine box is inclined 5 degrees backwards. 2.5.5. A rib module (part No. 5c) consists of a steel rib covered by a flesh-simulating polyurethane foam (part No. 5d), a piston-cylinder assembly (part No. 5e) linking the rib and spine box together, a hydraulic damper (part No. 5f) and a stiff damper spring (part No. 5g). 2.5.6. In the piston-cylinder assembly is a tuning spring (part No. 5h). 2.5.7. A displacement transducer (part No. 5i) can be mounted on the front face of the cylinder and connected to the inside of the rib.

Thorax. 5.9.1. Each rib module is certified separately. 5.9.2. The rib module is positioned vertically in a drop test rig and the rib cylinder is clamped rigidly onto the rig. 5.9.3. The impactor is a free fall mass of 7.8 + 0.0/-0.1 kg with a flat face and a diameter of 150 ± 2 mm. 5.9.4. The centre line of the impactor should be aligned with the centre line of the rib’s piston. 5.9.5. The impact velocity is 1.0, 2.0, 3.0 and 4.0 m/s respectively. Impact velocities should not vary from those specified by more than 2 per cent. 5.9.6. The rib displacement should be measured, for instance using the rib’s own displacement transducer. 5.9.7. The rib certification requirements are shown in table 4 of this annex. 5.9.8. The performance of the rib module can be adjusted by replacing the tuning spring inside the cylinder with one of a different stiffness. Table 4 - Certification requirements for the full rib module Impact velocity (m/s) Displacement (mm) Minimum Maximum 1.0 10.0 14.0 2.0 23.5 27.5 3.0 36.0 40.0 4.0 46.0 51.0

Thorax. 5.9.1. Each rib module is certified separately. 5.9.2. The rib module is positioned vertically in a drop test rig and the rib cylinder is clamped rigidly onto the rig. 5.9.3. The impactor is a free fall mass of 7.78 ± 0.01 kg with a flat face and a diameter of 150 ± 2 mm. 5.9.4. The centre line of the impactor should be aligned with the centre line of the rib's guide system. 5.9.5. The impact severity is specified by the drop heights of 815, 204 and 459 mm. These drop heights result in velocities of approximately 4, 2 and 3 m/s respectively. Impact drop heights should be applied with an accuracy of 1 per cent. 5.9.6. The rib displacement should be measured, for instance using the rib's own displacement transducer. 5.9.7. The rib certification requirements are given in Table 5 of this annex. 5.9.8. The performance of the rib module can be adjusted by replacing the tuning spring inside the cylinder with one of a different stiffness.