After building closed-loop model, we can analyze and evaluate the performances of IFOG in theory, and improve it, which provide evidences for designing system and choosing optical components.
闭环模型建立后，能从理论上分析、评价、改善IFOG性能，为系统设计和选择光学器件提供了依据。
A predication model of grey system theory was proposed for observation of building settlement. With the model, the ground settlement and its variation speed could be predicated.
应用灰色系统理论建立建筑物沉降观测的预测模型，对建筑物的沉降量及相应沉速作出预测。
Then, the virtual prototype of crawler running device is established based on multi-body system dynamics theory. The most complex part is to exert contact force in the model building process.
接着，以多体系统动力学理论为基础，建立了连续采煤机履带行走装置的虚拟样机模型，在建立模型过程中，最为复杂的可谓施加接触力。
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