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首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >THE MECHANISMS WHEREBY DOUBLE HELICAL OFFSET-TOOTHED SYNCHRONOUS BELT PRODUCES LOWER NOISE THAN STRAIGHT-TOOTHED SYNCHRONOUS BELT - A THEORETICAL INVESTIGATION
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THE MECHANISMS WHEREBY DOUBLE HELICAL OFFSET-TOOTHED SYNCHRONOUS BELT PRODUCES LOWER NOISE THAN STRAIGHT-TOOTHED SYNCHRONOUS BELT - A THEORETICAL INVESTIGATION

机译：双螺旋偏离齿形同步带产生较低的噪声的机构比直齿同步带 - 一种理论研究

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Recent experimental investigations demonstrate that the level of noise generated by double helical synchronous belt (DHSB) is lower than that by straight-toothed synchronous belt (STSB). The present study is to theoretically elucidate the mechanisms whereby DHSB produces lower noise. In the theoretical analysis, a model DHSB is divided into several parallel narrow DHSBs with equal width. Let each narrow DHSB's helical angle be 0° so each narrow DHSB becomes a narrow STSB. The theory of the one-dimensional sound field is then applied to obtain the standing wave solution of impact sound pressure. The sum of impact sound pressures by the narrow STSBs derived from one pair (left- and right-handed) of helical teeth of the model DHSB represents transmission impact noise. Computational results reveal that the power of impact sound at the damping-frequency decreases as the helical tooth's angle increases. In addition, the impact sound power decreases as the degree of tooth's offset of a double helical offset-toothed synchronous belt (DHOTSB) increases. Impact sound power is in the following order from high to low: STSB DHSB > DHOTSB. In experimental investigations, the noise was in the following order from high to low: STSB DHSB > DHOTSB, consistent with theoretical prediction. Also, the sound power at high frequency was markedly attenuated in DHSB or DHOTSB, the impact noise is the major sources of noise. Thus, the reduced noise in DHSB and DHOTSB can be explained by the one-dimensional standing wave sound field theory.
机译：最近的实验研究表明，双螺旋同步带（DHSB）产生的噪声水平低于直齿同步带（STSB）。本研究是理论上阐明DHSB产生较低噪声的机制。在理论分析中，模型DHSB被分成几个具有相同宽度的并联窄DHSB。让每个窄的DHSB的螺旋角度为0°，因此每个窄的DHSB变为窄的STSB。然后应用一维声场的理论以获得冲击声压的驻波溶液。窄STSB的冲击声压力总和来自模型DHSB的螺旋齿的一对（左右）表示传输冲击噪声。计算结果表明，随着螺旋齿的角度增加，阻尼频率的冲击声的功率降低。另外，随着双螺旋偏移齿的同步带（DHOTSB）的齿状的增加，冲击声功率降低。冲击声功率按以下顺序从高到低：STSB DHSB> DHOTSB。在实验研究中，噪声从高到低电平到低：STSB DHSB> DHOTSB，与理论预测一致。此外，在DHSB或DHOTSB中，高频处的声功率显着衰减，冲击噪声是主要噪声的主要源。因此，可以通过一维站立波声场理论解释DHSB和DHOTSB中的降低噪声。

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