Scholarlink

<p>The accurate evaluation of static pressure plays a vital role in subsonic applications within the realm of aerodynamics. The spatial distribution of static pressure critically influences the lift generation efficiency of wings in the subsonic regimes. In the present work, we study the micro-electromechanical system (MEMS)-based piezoresistive pressure sensor, precisely employed to measure static pressure on a scaled-down aircraft model. The analysis begins with modelling three distinct designs based on square, circular, and octahedral geometries. This provides valuable insights into the dynamic pressure distribution across the wing surfaces. Considering the subsonic pressure of 2&#xa0;bar, the sensor is robustly designed with attention to diaphragm flexural rigidity, ensuring accurate pressure measurements under varying aerodynamic loads<i>.</i> Finite element simulations demonstrate that, for all three diaphragm geometries analyzed, the maximum induced stresses are concentrated along the edges, while the peak deflection consistently occurs at the center, guiding the optimal placement of piezoresistor in high-stress concentration zones. Additionally, temperature effects are examined, revealing that as temperature decreases, displacement increases despite the rise in silicon stiffness. This behavior is attributed to thermal effects, such as contraction and bending, which dominate over the increased stiffness. The reduction in stress and increase in displacement are driven by thermal mismatch and the partial freedom of the diaphragm to deform. Thinner diaphragms exhibit greater sensitivity, highlighting the need for thermal considerations in high-accuracy sensor design.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancing pressure sensor performance through diaphragm geometry optimization for subsonic applications

  • 期刊论文

  • 发表日期：

    2025年8月1日

查看全文
  • Rahul Kumar Singh,
  • Pallavi Patel,
  • Neela Chattoraj,
  • Vinod Belwanshi,
  • Richa Mishra

摘要

The accurate evaluation of static pressure plays a vital role in subsonic applications within the realm of aerodynamics. The spatial distribution of static pressure critically influences the lift generation efficiency of wings in the subsonic regimes. In the present work, we study the micro-electromechanical system (MEMS)-based piezoresistive pressure sensor, precisely employed to measure static pressure on a scaled-down aircraft model. The analysis begins with modelling three distinct designs based on square, circular, and octahedral geometries. This provides valuable insights into the dynamic pressure distribution across the wing surfaces. Considering the subsonic pressure of 2 bar, the sensor is robustly designed with attention to diaphragm flexural rigidity, ensuring accurate pressure measurements under varying aerodynamic loads. Finite element simulations demonstrate that, for all three diaphragm geometries analyzed, the maximum induced stresses are concentrated along the edges, while the peak deflection consistently occurs at the center, guiding the optimal placement of piezoresistor in high-stress concentration zones. Additionally, temperature effects are examined, revealing that as temperature decreases, displacement increases despite the rise in silicon stiffness. This behavior is attributed to thermal effects, such as contraction and bending, which dominate over the increased stiffness. The reduction in stress and increase in displacement are driven by thermal mismatch and the partial freedom of the diaphragm to deform. Thinner diaphragms exhibit greater sensitivity, highlighting the need for thermal considerations in high-accuracy sensor design.