在各種作戰情境下，軍盔皆是軍人不可或缺的個人防護具之一，通常會在盔內貼附內襯墊以增加配戴時的舒適性、穩定性及安全性，但是目前國內外對於頭盔內襯墊厚度與頭盔合適性之相關研究鮮少，因此缺乏配戴建議與標準。有鑒於此，本研究以我國新型軍盔做為研究標的，招募30位20～30歲男性研究參與者，蒐集並比較配戴三種不同厚度內襯墊（10 mm、15 mm及20 mm）下的頭盔基準距離（Standoff distance, SOD，合頭程度的依據）、頭部壓力、頭盔穩定性（前後、左右、上下方向的頭盔移動量與縱軸、橫軸方向的偏移角度）以及主觀評量做為合適性指標，以找出最佳的襯墊厚度配置建議。
　　首先，本研究分別以三維疊合與游標卡尺方法量測靜態坐姿時的頭盔基準距離以評估合頭程度，並比較兩種方法的量測結果以相互驗證；過程中要求研究參與者配戴頭盔站立2分鐘，並分別於內襯墊與頭部表面間放置壓力感測器以量測頭部4個區域（前額、頭頂、側頭、後頭）的壓力情形，以評估其舒適性；隨後再要求參與者於跑步機上以時速8公里進行3分鐘的快走，除了蒐集頭部壓力，亦藉由三軸加速規估算頭盔的移動量，並在執行動作完成後使用坡度角度儀量測頭盔偏移角度，以評估穿戴穩定性；此外，將分別在執行站立動作前與快走動作後調查研究參與者對於合頭程度、頭部壓力、頭盔穩定性以及整體偏好等的主觀感受。
　　綜觀本研究實驗結果，兩種頭盔基準距離量測方法僅在後頭部位存在差異，並以三維疊合量測法有較高的精確度；合頭程度部分，厚度15 mm內襯墊符合軍盔安全標準並有最佳的合頭程度；頭部壓力部分，厚度20 mm內襯墊雖在靜態動作時有較均勻的頭部壓力，但於動態動作中則是以15 mm內襯墊有較佳的舒適性；穩定性部分，15 mm 內襯墊有最小的頭盔移動量及偏移角度，最為穩定；主觀偏好則是以15 mm內襯墊有最好的表現。同時本研究亦發現合頭程度、穩定性及主觀偏好之間具有正相關（Pearson相關係數介於0.67至0.79）。根據本研究結果，建議使用的內襯墊厚度為15 mm，以提升我國軍盔合適性，使得軍人在配戴時有更良好的合頭程度、穩定性及舒適感受，同時本研究可做為未來相關頭戴式產品進行合適性評估之考量準則，有助於頭盔開發設計之參考。

Military helmets are designed specifically to protect soldier’s head during combat. Poor helmet fitting has been reported to decrease its comfort, stability, and safety. To enhance the usability of military helmets, it is necessary to take head size and pad design into consideration. However, there are limited studies examining the correlation between pad thickness design and military helmet fitting. Thus, this study aims to identify the proper pad thickness design for stability and comfort of new military helmet from both static and dynamic perspectives.
Thirty male participants were recruited in this study. In the static experiment, two approaches (caliper measurement and 3D scanning for fitting test) were used to measure participants’ helmet standoff distance (SOD; the distance between inside of the helmet and the skull) with three pad thickness combinations (10 mm, 15 mm, and 20 mm) placed in the same helmet. In the dynamic experiment, participants performed two tasks including standing and walking on treadmill for 3 minutes with the speed of 8 km/hr. for all participants, contact pressure in four regions (front, top, sides, and occipital areas), displacement of helmet, and helmet tilt angle were collected. In addition, subjective responses including level of fit, head pressure, helmet stability, and overall preference were also collected after performing each of the two tasks.
The results showed that the difference of SOD measurements between the two approaches are significantly only in the occipital area. Besides, the 3D scanning method had higher precision than caliper measurement. Considering the level of fit, the pad with the thickness of 15 mm had the best performance and met the safety requirement. As for contact pressure, the pad with the thickness of 20 mm had better performance in the static posture, whereas the pad with the thickness of 15 mm outperformed in the dynamic postures. In addition, the pad with the thickness of 15 mm had less displacement and tilt angle of helmet, indicating the best stability. Further, subjective responses showed that participants prefer the pad with the thickness of 15 mm in terms of stability, comfort, and overall performance. Moreover, stability and comfort of helmet were found to be have high positive correlations (with Pearson’s correlation coefficient between 0.67 and 0.79).
Overall, the pad with the thickness of 15 mm are recommended to provide better fit, stability, and comfort for the new military helmet. The findings of this study also provides useful information for designing and developing related products in the future.

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