固定结构下的两向力及弯矩传感器设计

On the Transducer Design for Two-Component Force and Bending Moment Measurement in a Fixed Structure

为了刀板切削过程中的受力满足最合理的设计准则,专用传感器设计须基于固定总体结构,对局部结构优化,以达到设计合理的目的。刀板切削时受到土体的阻力可分解为水平力和垂直力,多维力传感器测量了两个力的大小和对传感器产生的弯矩。刀板工作中,弯矩引起的正应力比垂直力引起的拉应力及水平力引起的切应力要大得多,因此特别设计了弹性体的局部结构使得三个应力值接近于同一量级。传感器的标定结果显示,输入输出有良好的线性关系,并且很好地消除了耦合效果。最终,将该传感器应用于土体切削测试并验证了其可靠性。

In order to satisfy the most reasonable design criteria for stress acted on cutting board in cutting process,special transducer design must be based on a fixed overall structure,and local structure optimization to achieve the purpose of reasonable design.In cutting process,the resistance from soil body can be decomposed into horizontal component and vertical component,these two component and bending moment values were measured by multi-dimensional force transducer.In cutting process,the normal stress produced by bending moment is far larger than the tension stress produced by vertical component and the shearing stress produced by horizontal component.In particular,the local structure of elastic body was redesigned,so that three stress values are close to the same order of magnitude.Transducer calibration results show that its input and output present good linear relationship and the coupling effect is eliminated effectively.Finally this transducer was applied to soil body cutting measurement,its reliability was verified.