The possibilities of testing real constructions are often limited, especially in case of large constructions. The idea of model testing is to create a sub-scaled model in order to anticipate the behavior of the real construction, regarding the behavior of the model, with sufficient accuracy. The aim of this paper is to demonstrate that model testing of bucket wheel excavator structure, from the aspect of the strength of the constructions, is possible. In order to prove this assumption, firstly, numerical calculations of a real construction and its sub-scaled model were performed using the Finite Element Method. Sub-scaled structure is 10 times scaled real structure (in size and plates thickness). Within the static calculation, the analysis of the stress mapping from sub-scaled model to real structure was carried out, by partial groups of construction. The coefficients connecting stresses of sub-scaled model and stresses of real construction were formulated. Dynamic calculations of sub-scaled model and real structure were also performed. Then, a physical model was produced and subjected to experimental testing. Experimental testing was performed in order to verify the numerical models. A parallel testing of the model with strain gauges and a system for non-contact measurement of displacement and deformation was performed. High matching results were obtained of two experimental methods on one side, and numerical calculation on the other side. The physical model and the successful experiments carried out on it confirmed that these structures can be subjected to model testing, without important constraints and with sufficient accuracy.

中文翻译：

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斗轮挖掘机SchRs 630强度模型分析

测试实际结构的可能性通常是有限的，特别是在大型结构的情况下。模型测试的想法是创建一个小比例模型，以便以足够的精度预测实际结构的行为（关于模型的行为）。本文的目的是从结构强度方面证明斗轮挖掘机结构的模型试验是可能的。为了证明这一假设，首先使用有限元法对实际结构及其小比例模型进行了数值计算。缩小比例的结构是真实结构的 10 倍比例（尺寸和板厚度）。在静力计算中，按部分施工组进行了从缩尺模型到实际结构的应力映射分析。制定了连接缩尺模型应力和实际结构应力的系数。还进行了缩尺模型和真实结构的动态计算。然后，制作物理模型并进行实验测试。进行实验测试是为了验证数值模型。使用应变仪和非接触式位移和变形测量系统对模型进行了并行测试。一方面两种实验方法和另一方面数值计算得到了高度匹配的结果。物理模型和对其进行的成功实验证实，这些结构可以进行模型测试，没有重要的约束并且具有足够的精度。