電路板楔型夾持器之勁度估算

Stiffness Estimation of Wedge-Lock Retainers for PC Boards

本文利用Seireg經驗公式探討楔型夾持器（wedge-lock retainer）夾持平板工件之邊界勁度，並以有限元素法計算其振頻與模態，及利用試件進行模態測試驗證。平板受楔型夾持器夾持後，實驗與有限元素法證明其振頻介於邊界條件為固定支持與簡支撐之間。以Seireg公式之旋轉勁度值計算平板之前2振頻精確度為7.18%與-2.31%，以最小平方差法求得之振頻精確度為4.38%與-4.09%，可知本文利用Seireg經驗公式之推導過程相當可行。本文之方法可用於概念設計過程之勁度估算，及建立一套應用於楔型夾持器完整的設計規範，極具實用性。

The boundary stiffness effects of the plates clamped by wedge-lock retainers are studied in this paper. The natural frequencies of the plates estimated by a procedure using Seireg's empirical formula for rotational stiffness are compared with those from modal testing and finite element modeling. When a rectangular plate is clamped by wedge-lock retainers, it is verified that its natural frequencies are between those of plates with clamped boundary conditions and those of plates with simply supported boundary conditions. Based on Seireg's empirical formula, the errors of natural frequency for the first two modes are 7.18% and-2.31%, while the errors of natural frequency, based on the least square error criteria, are 4.38% and -4.09%. The comparison reveals the practicability of our estimation procedure for the boundary rotational stiffness of wedge lock retainers.