Lightweight design of accessory transmission based on heuristic algorithm
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摘要:
为解决因航空发动机功率密度、轻量化水平的不断提高所带来的常规设计方法难以满足附件传动系统高可靠、轻量化、低成本等综合性能设计需求的问题,提出了一种采用基于启发式搜索的非支配排序算法(HS-NSGA Ⅱ)的传动系统结构轻量化设计方法,开展了某航发附件机匣传动系统结构参数的优化设计,发现优化齿轮齿宽和腹板结构对传动系统轻量化程度最为显著,而引入喷丸强化等表面强化工艺可进一步提高传动系统服役性能,实现相比初始方案,齿轮组质量最大降低了21.0%,系统最大相对滑动率降低11.4%,为航空发动机附件齿轮传动系统轻量化设计提供了方法支撑。
Abstract:To solve the problem that conventional design methods are unable to meet the comprehensive performance design requirements of accessory transmission systems, such as high reliability, lightweight, and low cost, due to the continuous improvement of power density and lightweight level of aero-engines, a lightweight design method of transmission structure based on the heuristic search non-dominated sorting genetic algorithm Ⅱ (HS-NSGA Ⅱ) was proposed, and the optimal design of structural parameters of an aero-engine accessory gearbox transmission was launched. It was found that the optimization of gear tooth number and displacement had the most significant effect on the lightweight degree of transmission. The introduction of surface hardening processes, such as shot peening, can further improve the service performance of the transmission. Compared with the initial design, the maximum weight of the gear set was reduced by 21.0%, and the maximum relative slip rate of the system was reduced by 11.4%. This can provide a methodological support for the lightweight design of the aero-engine accessory gear transmission.
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Key words:
- accessory gearbox /
- transmission /
- multi-objective optimization /
- lightweight /
- heuristic algorithm
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表 1 该航发附件机匣运转工况
Table 1. Operating conditions of the aero-engine accessory gearbox
工况参数 数值 输入转速n/(r/min) 40000 输出转速/(r/min) 输出轴A 14000 输出轴B 18200 输出轴C 14600 输出功率/kW 输出轴A左端 14 输出轴A右端 4 输出轴B 2 输出轴C 5 表 2 齿轮传动系统初始设计方案
Table 2. Initial design scheme of gear transmission
参数 齿轮1 齿轮2 齿轮3 齿轮4 齿轮5 模数m/mm 1.5 1.5 1.5 1.5 1.5 齿数z 48 37 27 35 46 齿宽b/mm 4 5 6 5 4 压力角α/(°) 25 25 25 25 25 变位系数x /mm 0 0 0 0 0 接触安全系数Sh 1.58 1.44 1.39 2.63 2.75 弯曲安全系数Sf 4.29 4.67 5.43 14.42 12.19 胶合安全系数Sins 3.81 3.16 3.16 4.38 4.58 轴系角度安装角度αshaft/(°) 5 10 3 30 选用材料 一代航空齿轮钢 表 3 材料疲劳极限值(99%可靠度下)
Table 3. Material fatigue limit value (under 99% reliability)
材料 弯曲疲劳
极限σflim/MPa接触疲劳
极限σhlim/MPa胶合极限
温度/℃一代航空
齿轮钢500 1500 296 喷丸强化
一代齿轮钢600 1600 296 二代航空
齿轮钢650 1700 表 4 结构优化方案
Table 4. Structural optimization scheme
参数 齿轮1 齿轮2 齿轮3 齿轮4 齿轮5 模数m/mm 1.5 1.5 1.5 1.5 1.5 齿数z 48 37 27 37 43 齿宽b/mm 3 4 5 4 3 压力角α/(°) 25 25 25 25 25 变位系数x/mm 0.026 −0.026 0.026 −0.026 0.026 接触安全系数Sh 1.42 1.30 1.26 2.34 2.38 弯曲安全系数Sf 3.48 3.77 4.74 11.39 9.28 胶合安全系数Sins 3.53 2.80 2.80 4.23 4.48 轴系角度安装角度αshaft/(°) 5 10 3 30 表 5 结构优化方案优化效果
Table 5. Optimization effect of structural optimization scheme
参数 初始设计方案 结构优化方案 变化率/% 最小重合度ε 1.476 1.479 0.2 最大相对
滑动率η1.054 0.998 −5.3 齿轮组
质量M/kg0.781 0.698 −10.6 表 6 腹板优化方案减重效果
Table 6. Lightweight effect of web optimization scheme
齿轮/方案 质量/kg 减重率/% 结构优化方案 腹板优化方案 齿轮1 0.228 0.213 6.8 齿轮2 0.117 0.097 14.9 齿轮3 0.059 0.059 0 齿轮4 0.087 0.065 25.3 齿轮5 0.209 0.200 4.3 齿轮组 0.698 0.635 9.0 表 7 工艺优化方案优化效果
Table 7. Optimization effect of process optimization scheme
参数 腹板优化方案 工艺优化方案 变化率/% 齿宽b/mm 5 4.5 −10 齿轮组
质量M/kg0.635 0.617 −2.8 最大相对
滑动率η0.998 0.934 −6.4 最小接触
安全系数Sh1.26 1.26 0 最小弯曲
安全系数Sf3.48 3.59 3.2 最小胶合
安全系数Sins2.80 2.58 −7.9 -
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