随着计算机日益广泛地用于实验控制与数据处理,机械元件与电学元件直接耦合的数字型传感器开始取代传统的阻抗电桥式调幅型传感器,振弦式测力计是其代表之一。本文从数理方程与谐振电路两方面分析其特性;然后把机械元件等效为虚拟变压器次级的负载,与等效的初级(电子元件)耦合形成闭环反馈振荡系统;并分析了温度影响问题。 As computers are increasingly used for experimental control and data processing, digital sensors that are directly coupled to mechanical components and electrical components are beginning to replace traditional impedance bridge-type AM sensors. Vibrating-wire dynamometers are one of the representatives. In this paper, we analyze its characteristics from two aspects of the mathematical equation and the resonant circuit. Then, the mechanical components are equivalent to the secondary load of the virtual transformer, coupled with the equivalent primary (electronic components) to form the closed-loop feedback oscillation system, and the temperature influence is analyzed.