Previous studies were engrossed only in development of the performance and technology of automobiles. However, today‘s studies on automobiles also place a large importance in searching for methods that can maximize passengers’ structural safety and sensitivity, with relevant studies under way. In ad...
Previous studies were engrossed only in development of the performance and technology of automobiles. However, today‘s studies on automobiles also place a large importance in searching for methods that can maximize passengers’ structural safety and sensitivity, with relevant studies under way. In addition, with an increase in average life expectancy, this has also brought about an aging society. For such reasons, a large importance must also be placed on the studies of automobiles for the object of the elderly. Currently, most of the elderly are seated on the seat cushion with degradation of body structure and functions. So as to frequently drive with an unsatisfactory posture upon driving. Such unsatisfactory postures of the elderly induce blood circulatory disturbances and pain. Worsening of these can lead to diseases such as pressure sores, etc. Also, the seat cushion should ideally distribute body weight, and properly absorb impacts and vibrations. However, the elderly who are prone to poor seating postures, fail to obtain such condition so that comfort is remarkably degraded, sometimes accompanied by the appeal of pain upon driving for a long time. To solve such problems as above, various studies are being conducted where the seating posture types preferred by drivers and the characteristics of body pressure distribution are analyzed and standardized. However, accuracies of the results of the above studies have been determined somewhat insufficient. The reason is that measurements and analyses of body pressure distribution were conducted without identification of the characteristics of load and deflection, etc. of the seat itself which was most basic. Also, studies on automotive seat cushions have been conducted for objects of the general public thus far. However, studies on seat cushions for the elderly were identified to have not been conducted. Thus, in this load characteristic tests were conducted first to derive the seat-inherent characteristics such as deflection and stiffness, hysteresis curve etc of the seat cushion as a function of loads for the automotive seat, and then measurement tests for body pressure distribution were conducted to secure body pressure data of the elderly. Based on the data combining the above two test results, stiffness values and stiffness ratio were obtained through which seat cushion pattern models could be derived. Based on this, we analyzed the pattern of the stiffness distribution of the subject, selected and classified the patterns, and 11 different stiffness pattern models were derived and the characteristics of each pattern were analyzed. The 1st hardness measurement experiments were carried out using four types of seat cushion samples belonging to the hardness range of a commercial seat cushion prior to the production of the prototype. The regression equation was derived by regression analysis of the results, and the hardness value was predicted inversely through the regression equation, and it was made possible to utilize it in the production of prototype of the actual prototype seat cushion. In the next step of the 1st hardness measurement experiment, the derived stiffness pattern model is manufactured as a prototype. In order to produce the stiffness pattern model as a prototype, the size distribution of the stiffness value should be converted to the size distribution of the hardness value in accordance with the hardness range when manufacturing the commercial seat cushion. Therefore, the hardness pattern model having the same distribution of the stiffness pattern model and the same size distribution is derived through the conversion of the stiffness value, and the characteristics of each pattern are also the same because the distribution of the sizes is the same. Finally, the hardness value of the seat cushion was measured through the secondary hardness measurement test and the regression equation was generated by regression analysis of the result. This process is to predict the hardness value required in the production of the seat cushion through the regression equation. Based on this, the final 11 types of seat cushion prototypes were manufactured. When the seat cushions are produced on the basis of the above pattern models, it is considered possible to more ideally distribute the body weight and to improve comfort upon seating compared with the existing commercial cushions.
Previous studies were engrossed only in development of the performance and technology of automobiles. However, today‘s studies on automobiles also place a large importance in searching for methods that can maximize passengers’ structural safety and sensitivity, with relevant studies under way. In addition, with an increase in average life expectancy, this has also brought about an aging society. For such reasons, a large importance must also be placed on the studies of automobiles for the object of the elderly. Currently, most of the elderly are seated on the seat cushion with degradation of body structure and functions. So as to frequently drive with an unsatisfactory posture upon driving. Such unsatisfactory postures of the elderly induce blood circulatory disturbances and pain. Worsening of these can lead to diseases such as pressure sores, etc. Also, the seat cushion should ideally distribute body weight, and properly absorb impacts and vibrations. However, the elderly who are prone to poor seating postures, fail to obtain such condition so that comfort is remarkably degraded, sometimes accompanied by the appeal of pain upon driving for a long time. To solve such problems as above, various studies are being conducted where the seating posture types preferred by drivers and the characteristics of body pressure distribution are analyzed and standardized. However, accuracies of the results of the above studies have been determined somewhat insufficient. The reason is that measurements and analyses of body pressure distribution were conducted without identification of the characteristics of load and deflection, etc. of the seat itself which was most basic. Also, studies on automotive seat cushions have been conducted for objects of the general public thus far. However, studies on seat cushions for the elderly were identified to have not been conducted. Thus, in this load characteristic tests were conducted first to derive the seat-inherent characteristics such as deflection and stiffness, hysteresis curve etc of the seat cushion as a function of loads for the automotive seat, and then measurement tests for body pressure distribution were conducted to secure body pressure data of the elderly. Based on the data combining the above two test results, stiffness values and stiffness ratio were obtained through which seat cushion pattern models could be derived. Based on this, we analyzed the pattern of the stiffness distribution of the subject, selected and classified the patterns, and 11 different stiffness pattern models were derived and the characteristics of each pattern were analyzed. The 1st hardness measurement experiments were carried out using four types of seat cushion samples belonging to the hardness range of a commercial seat cushion prior to the production of the prototype. The regression equation was derived by regression analysis of the results, and the hardness value was predicted inversely through the regression equation, and it was made possible to utilize it in the production of prototype of the actual prototype seat cushion. In the next step of the 1st hardness measurement experiment, the derived stiffness pattern model is manufactured as a prototype. In order to produce the stiffness pattern model as a prototype, the size distribution of the stiffness value should be converted to the size distribution of the hardness value in accordance with the hardness range when manufacturing the commercial seat cushion. Therefore, the hardness pattern model having the same distribution of the stiffness pattern model and the same size distribution is derived through the conversion of the stiffness value, and the characteristics of each pattern are also the same because the distribution of the sizes is the same. Finally, the hardness value of the seat cushion was measured through the secondary hardness measurement test and the regression equation was generated by regression analysis of the result. This process is to predict the hardness value required in the production of the seat cushion through the regression equation. Based on this, the final 11 types of seat cushion prototypes were manufactured. When the seat cushions are produced on the basis of the above pattern models, it is considered possible to more ideally distribute the body weight and to improve comfort upon seating compared with the existing commercial cushions.
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