The acoustic radiation and acoustic power from a cylinder excited by a point force was estimated by employing the approximate Kirchhoff integration method. And the relationship between the sensor number requirement and estimation precision was investigated. Once the estimation precision of one field point's sound pressure level or sound power level was given, it was found that more sensors are needed to meet this estimation precision when frequency increases in general; however, near the peak frequency of field point's sound pressure level or sound power level, a valley of the required sensor number appears; the position of the excitation force has little effect on the sensor number requirement when the sound pressure of single field point is estimated. Then, the required sensor number of the whole space sound pressure estimation was investigated. It was shown that the curve of required sensor number of the whole space sound pressure estimation is smoother than that of a single field point sound pressure estimation, no valley appears near the peak frequency of the former.%使用近似Kirchhoff积分法估计点力源激励下圆柱壳体的辐射声压和声功率,研究壳体表面速度传感器均匀布放时传感器数目对估计精度的影响.单个场点声压估计和声功率估计误差给定的情况下,随着频率的升高,所需的传感器越来越多,但在场点声压级曲线或辐射声功率级曲线的峰值频率附近,需要的传感器数目会出现谷值；且激励源位置对单个场点声压估计时的传感器数目要求影响不大.进一步研究了全空间声压估计时的传感器数目需求,发现此时传感器需求数目曲线比单个场点声压估计时的传感器数目需求曲线平滑,不会在曲线峰值频率附近出现谷值.
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