航行中螺旋桨产生鸣音是由于在桨叶()以外的部位产生有规律的涡流,在某些转速下涡流引起的振动频率与桨叶固有频率接近而产生共振所致。A、随边0.4RB、随边0.7RC、导边0.4RD、导边0.7R

题目
航行中螺旋桨产生鸣音是由于在桨叶()以外的部位产生有规律的涡流,在某些转速下涡流引起的振动频率与桨叶固有频率接近而产生共振所致。

A、随边0.4R

B、随边0.7R

C、导边0.4R

D、导边0.7R


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  • 第1题:

    关于螺旋桨鸣音,下列不正确的说法是()。

    A、在螺旋桨工作时发出的“嗡嗡”的响声

    B、导边涡流激振力引起的桨叶振动

    C、实质上是共振

    D、随边0.4R以外部位的涡流引起的振动频率与桨叶固有频率接近所致


    参考答案:B

  • 第2题:

    使用激振器使结构产生连续的周期性强迫振动,在激振器振动频率与结构固有频率一致时,结构出现共振现象。( )


    答案:对
    解析:

  • 第3题:

    在鱼洗实验中,下列哪个说法是正确的? In the fish washing experiment, which of the following statements is true?

    A.当鱼洗器壁的振动频率越来越接近于鱼洗固有频率时,产生共振现象; Resonance phenomenon occurs when the vibration frequency of the wall of the fish washer is closer and closer to the natural frequency of the fish washer;#B.当鱼洗器壁的振动频率大于鱼洗固有频率时,产生共振现象; Resonance phenomenon occurs when the vibration frequency of the wall of the fish washer is greater than the natural frequency of the fish washer;#C.当鱼洗器壁的振动频率小于鱼洗固有频率时,产生共振现象; When the vibration frequency of the fish
    B

  • 第4题:

    直升机诱导旋转阻力产生的原因是()

    A.旋翼向下排压空气使空气加速向下流动

    B.空气与旋产生摩擦

    C.桨叶前缘阻挡空气和后缘涡流区的影响


    正确答案:A

  • 第5题:

    66、在鱼洗实验中,下列哪个说法是正确的? In the fish washing experiment, which of the following statements is true?

    A.当鱼洗器壁的振动频率越来越接近于鱼洗固有频率时,产生共振现象; Resonance phenomenon occurs when the vibration frequency of the wall of the fish washer is closer and closer to the natural frequency of the fish washer;###SXB###B.当鱼洗器壁的振动频率大于鱼洗固有频率时,产生共振现象; Resonance phenomenon occurs when the vibration frequency of the wall of the fish washer is greater than the natural frequency of the fish washer;###SXB###C.当鱼洗器壁的振动频率小于鱼洗固有频率时,产生共振现象; When the vibration frequency of the fish
    AD