基于模态误差贡献率的应变传感器优化布置

Optimal Placement of Strain Sensors Based on Modal Error Contribution Ratio

针对已经存在的ROC准则、模态累加准则等模态选取方法进行了研究,针对这些方法在复杂、对称的空间大型桁架结构中无法有效地选取关键模态信息的问题进行了深入的探讨,并提出了解决此类问题的模态误差贡献率法(MER)。通过以8 m天线背架为研究对象,在有效独立法的基础上,对既有的ROC法、模态叠加法和MER法进行了对比,结果表明:MER法有效地解决了复杂、对称的大型空间桁架结构的模态选取困难问题,有效地保留了能够更好反映结构信息的模态。

This paper studies the existed ROC criteria,modal accumulate criteria and other modal select methods.The problem of choosing critical modal information in complex and symmetrical space large truss structures is discussed on these methods,and then the modal error contribution ratio method(MER)is proposed to solve such problems.Finally,by taking the 8m antenna back frame as the object of study,the existing ROC method,modal superposition method and MER method are compared based on effective independent method.The result show that:the MER method effectively solves the difficult problem of modal selection of complex and symmetrical large space truss structures and preserves modes that respond better to structural information.