TAILIEUCHUNG - Mechatronics for Safety, Security and Dependability in a New Era - Arai and Arai Part 4

Tham khảo tài liệu 'mechatronics for safety, security and dependability in a new era - arai and arai part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 74 Figure 1 Measuring device SWELL for lower leg swelling the volume of the lower leg by means of water displacement volumetry WDV has also been reported 8 . This method is attended with practical difficulties particularly in the workshop. The purpose of this study is to develop a measuring device utilized for the worker s lower leg swelling in the workplaces and to perform the characteristic tests of the device. Finally experiments were carried out to apply the device to standing work tasks for thirteen subjects. 2. MEASURING DEVICE Figure 1 shows a measuring device of the leg swelling developed in this study. It is named as SWELL Sensoring Wire for Edema of Lower Leg . The device mainly consists of a flexible wire a coil spring a flat spring and a strain gauge T44-FA2-350-ll-VS015C . The wire and the flat spring are made of stainless steel. The both ends of the flat spring are bent at 90 degrees. The coil spring and the wire 220 X Ộ are connected to the one end of the flat spring. The other end of the flat spring is fastened to the hard belt. When the wire is wound around the lower leg with proper tension the flat spring produces strain as the leg swelling develops. The magnitude of the leg swelling is estimated by measuring the strain of the flat spring. Here the leg swelling is defined as follows The magnitude of the leg swelling is expansion of the maximum circumference length of the lower leg. The unit is mm . The ball chain is used to fix the wire to the other end of the flat spring adjusting the length of the wire. The wire refrains from digging into the skin of the leg due to the smooth paper belt in the figure. And the smooth paper makes the wfre move smoothly when the circumference length increases. A linear relationship was found between the strain and the expansion of the coil spring after repetitions of the measurements. The spring constant of the coil spring is mm. It is considered that the value is too small to inhibit the .

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