These empirical formulae agree well with the test results so that the simplified design formulae are feasible.
这些经验公式与试验结果符合良好，设计式简便可行。
According to the measurement and analysis of natural vibration characteristics of tube heater, a simplified calculating method and empirical formulae were suggested.
根据管式加热炉结构和动力特征的实测结果，提出了简便的计算方法和经验公式。
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