The hydromatic machines， which are represented by blowers，ventilating fans， pumps etc.，usually consist of moters andblades. They sometimes ‘cause large amplitude of vibration，and then yield much dynamic stress on the roots of bladesexcited rotating unbalance forces， generated by sticked dirtson the blades， for example.Most undesirable case of operation for these machines isto the resonance phenomena between the natural frequencies ofsystem and exciting forces. Therefore it is necessary to providefor the calculated natural frequencies of them， so we tried tocalculate them assumed the system consist of a mass and springsof supporting structure using the flexibility matrix method.The results obtained from the calculation agree well with themeasurements and then guidelines for design of these machinesare required.
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