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本文对振动采种机振动参数的选择和计算进行了研究。找出了成熟杉木种子和马尾松球果振落最佳时的频率和加速度范围。测定了杉木、马尾松立木的自振频率、弹性模量、阻尼系数。提出了力学简化模型,推导了振动计算方法,进行了计算并和实测值作了比较。其主要结果如下: 1.频率范围5～100赫兹。杉木最佳在70～80赫兹,马尾松在50～60赫兹。加速度范围在5g以上。 2.杉木立木的弹性模量为58900公斤/厘米~2,马尾松为51600公斤/厘米~2。阻尼系数为0.23～0.36。 3.树干振动是一种无限多自由度的悬臂梁的横向振动。其一阶基频的计算值和实测值相差在10％左右。 4.对于树径在10～25厘米、树高在6～15米的杉木,在80赫兹下激振,产生10g的加速度所需激振力基本在50～500公斤。 5.振动消耗的功率小,节约能源。
In this paper, the vibration parameters of vibrating machine selection and calculation were studied. Find out the frequency and acceleration range when the mature Chinese fir seed and Pinus massoniana shake off the best. The natural frequency, elastic modulus and damping coefficient of Chinese fir and Pinus massoniana were measured. A mechanistic simplified model is proposed, the vibration calculation method is deduced, calculated and compared with the measured value. The main results are as follows: 1. Frequency range of 5 to 100 Hz. The best fir is 70 ~ 80 hertz, Masson pine is 50 ~ 60 hertz. Acceleration in the range of 5g or more. Cunninghamia lanceolata elastic modulus of 58,900 kg / cm ~ 2, masson pine to 51600 kg / cm ~ 2. The damping coefficient is 0.23 ~ 0.36. 3. Trunk vibration is an infinite degree of freedom lateral cantilever vibration. The difference between the calculated value of the first-order fundamental frequency and the measured value is about 10%. 4. For Chinese fir with trees of 10-25 cm in height and tree height of 6-15 meters, exciting at 80 Hertz, the excitation force needed to generate 10 g of acceleration is about 50 to 500 kg. Vibration power consumption is small, save energy.