One of the most important issues for the helicopter pilots is the health risk due to the vibration transmitted to the pilot through the seat. In this article, a seat suspension based on negative stiffness structure is presented to decrease the vibration transmitted to the pilot in both vertical and lateral directions without losing the loading capacity of the system. Here, an integrated model of the suspension–cushion–occupant is derived. To generalize the results of system analysis and its usability in other applications, the impact of parameters on the system performance is studied in dimensionless form. Despite coupling between the lateral and vertical directions, the design parameters of the seat suspension are determined in such a way that the system responds simultaneously as a negative stiffness structure in both directions. The system efficiency in vibration damping is assessed by seat effective amplitude transmissibility and transmissibility criteria. In addition, the whole body vibration and impact of the vibration on the pilot body are evaluated using ISO-2631. To verify the system efficiency in more realistic situation, the simulations are performed using the measured vibration data of a Bell-412 helicopter. The results indicate that the vibration amplitude is decreased by about 45% and 48% in the lateral and vertical directions, respectively. The frequency spectrum comparison of the seat and cabin floor reveals 80% reduction of amplitude in fundamental frequency in the vertical direction, whereas it is about 93% in the lateral direction. Furthermore, the level of pilot’s comfort and perception is improved that demonstrates better riding quality and reduced vibration environment.

对于直升机飞行员来说，最重要的问题之一是由于振动通过座椅传递给飞行员的健康风险。在本文中，提出了一种基于负刚度结构的座椅悬架，以在不损失系统承载能力的情况下减少垂直和横向传递给飞行员的振动。在此，推导出悬架-坐垫-乘员的集成模型。为了概括系统分析的结果及其在其他应用中的可用性，以无量纲形式研究参数对系统性能的影响。尽管横向和垂直方向之间存在耦合，但座椅悬架的设计参数是以这样一种方式确定的，即系统在两个方向上作为负刚度结构同时响应。系统减振效率通过座椅有效振幅传递率和传递率标准进行评估。此外，使用ISO-2631评估全身振动和振动对飞行员身体的影响。为了在更现实的情况下验证系统效率，使用 Bell-412 直升机的实测振动数据进行了模拟。结果表明，振动幅度在横向和垂直方向上分别降低了约 45% 和 48%。座椅和客舱地板的频谱比较显示，垂直方向的基频幅度减少了 80%，而横向方向的幅度约为 93%。此外，