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双轴惯性振动筛力心概念的确立，发展了振动筛的设计理论。该理论已成功的应用在PTZS型平动椭圆振动筛的设计实践中。本文同时从解析法和几何法两方面对力心的确定性与唯一性进行了全面的进一步的理论论证。
The establishment of the concept of biaxial inertial vibrating screen center of gravity has developed the design theory of vibrating screen. This theory has been successfully applied in the design practice of PTZS type translational oval shale shaker. In the meantime, this paper carries out a comprehensive and further theoretical proof of the certainty and uniqueness of the effort in both the analytical and the geometric aspects.