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Design and Analysis on Load Cell of Weighing Machines
Yan Shi, Chang
|關鍵字:||Load Cell;負荷元;FEM;Optimal Design;有限元素法;最佳化設計||出版社:||生物產業機電工程學系||摘要:||
結果，製作負荷元實體模型，於負荷範圍9.8-490 N 進行承受負載試
輕、重負荷分別為4.62 %與0.75 %，並配合LabVIEW 與資料擷取裝
In this study, a G-typed load cell had been designed for a two-stage weight measurement. It depends on the contact condition to distinguish light and heavy loadings. In the contact analysis with Lagrange multiplier method, constraints of displacements are applied at contact boundaries, which may result in contact forces. In the shape optimization process, the objective is to improve measurement sensitivity; therefore displacements at certain points are maximized and stress constraints are satisfied. The coefficients of elliptical curve functions at design boundaries are treated as design variables, and the final shape is then obtained. The mass of the model has been reduced by 6.91%. Finally, an actual load cell had been made according to optimization results. The loading test had been undertaken with loadings from 9.8 to 490 N. The relation between voltage and weight can be found according to the experimental data. The maximum relative errors in light and heavy loadings are 4.62% and 0.75%, respectively. Accordingly, a weighing system with the load cell developed in this study as well as LabVIEW programs and DAQ card can then be constructed.
|Appears in Collections:||生物產業機電工程學系|
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