39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
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# 计算直线塔不平衡张力
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# 新版输电线路大手册 P328
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import math
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# 架线时的状态
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t_m = 100 # 导线架设时的气温。单位°C
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sigma_m = 10 # 架线时，初伸长未释放前的最低点水平应力。单位N/mm2
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lambda_m = 10 # 导线比载 N/(m.mm)
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t_e = 25 # 架线时考虑初伸长的降温，取正值。单位°C
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# h_i 悬点高差
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# l_i 悬点档距
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# alpha 导线膨胀系数 1/°C
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# E 弹性系数 N/mm2
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# lambda_i 计算不平衡张力时导线比载 N/(m.mm)
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# sigma_i 计算不平衡张力时最低点水平应力 单位N/mm2
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# t_i 计算不平衡张力时导线温度 单位°C
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# lambda_m 导线架线时时导线比载 N/(m.mm)
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# sigma_m 导线架线时时最低点水平应力 单位N/mm2
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# t_m 导线架线时时导线温度 单位°C
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def delta_li(h_i, l_i, lambda_i, alpha, E, t_i, sigma_i, lambda_m, t_m, sigma_m):
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beta_i = math.atan(h_i / l_i)
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t = (
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l_i
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/ ((math.cos(beta_i) ** 2) * (1 + (lambda_i * l_i / sigma_i) ** 2 / 8))
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* (
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(l_i * math.cos(beta_i)) ** 2
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/ 24
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* ((lambda_m / sigma_m) ** 2 - (lambda_i / sigma_i) ** 2)
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+ ((sigma_i - sigma_m) / E / math.cos(beta_i))
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+ alpha * (t_i + t_e - t_m)
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)
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)
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print("Finished.")
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