International Business Machines Corporation

Yasuyuki Ohki

Minoru Kida

According to the present invention, it is possible to reduce the fan noise taking the human sense into consideration. Specifically, it is possible to ergonomically mitigate the discomfort due to the short-term variation of the working rate of the CPU by increasing the rotational frequency gradually and by decreasing the rotational frequency with the temperature fall taking the human sense of noise into account. The present invention reduces noise produced by a cooling fan by controlling the fan rotation to a minimum rotational frequency in accordance with the specification and performance of the heat source. Additionally, an embodiment of the present invention controls a cooling fan to a minimum allowable rotational frequency within a rated temperature range of the object to be cooled, thereby controlling the internal temperature of a computer system in such a way to minimize noise generation.

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Sagamihara, Japan

Yasuyuki Ohki