Based on bond graph theory, the bond model of a road smoothness measuring equipment vibration has been set up, and the state equation and the dynamic simulation program established.
应用键合图理论建立了路面平整度仪振动系统的键合图模型，并推导出状态方程，编制了动态仿真程序。
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Caterpillar, the US-based manufacturer of earthmoving equipment, followed with a Rmb1bn bond in November.