Dynamics Optimization of Yawing Mechanism in Wind Tunnel Test
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摘要: 为了提高风洞试验偏航机构的驱动能力、传力性能及平稳性，对偏航机构的参数进行了灵敏度分析和优化。针对影响性能的因子，通过运动学和动力学求解，提出了偏航机构动力学性能的评判指标。以Isight软件为平台，结合MATLAB，对偏航机构压力角、旋转部件转动惯量和直线滑块加速度等因子进行灵敏度分析。在此基础上，建立多目标优化模型，对影响因子进行了优化计算。结果表明：偏航机构压力角最大值降低了12.47%，旋转部件转动惯量减少了6.7%，直线滑块加速度均方根值减少了43.72%。Abstract: In order to improve the driving capability, the load-transferring property and the smooth performance of the yawing mechanism which is used in the wind tunnel experiment, sensitivity analysis and optimization of parameters to the yawing mechanism were carried out. Based on the factors which affect the performances of yawing mechanism, the judging indexes of dynamics optimization were proposed through solving kinematic and dynamic equations. Taking the Isight software as a platform, based on MATLAB, sensitivities of pressure angle of yawing mechanism, rotary inertia of the rotating part and acceleration of linear slider were analyzed. On this basis, the multiobjective optimization model was established; the influence factors above were optimized in Isight. The results show that the maximum pressure angle of yawing mechanism is reduced by 12.47%, the rotary inertia of the rotating part is lowered by 6.70% and the root mean square acceleration of linear slider is reduced by 43.72% after optimization.
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Key words:
- wind tunnel experiment /
- yaw mechanism /
- dynamics /
- Isight /
- sensitivity analysis /
- multiobjective optimization
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表 1 变量参数取值范围
参数名 初始值 取值范围 弧形导轨半径R/mm 1 420 [1 380, 1 460] 驱动连杆长度L/mm 320 [300, 340] OB与x轴夹角θ/(°) 0 [-3, 3] 直线导轨位置xo/mm 1 600 [1 550, 1 650] 
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表 2 优化前后偏航机构参数
参数 初始值 优化值 圆整值 R/mm 1 420 1 381.2 1 381 L/mm 320 335.83 336 θ/(°) 0 2.143 2.1 xo/mm 1 600 1 550.7 1 551
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表 3 响应参数优化前后计算结果
响应参数 初始值 优化后 增幅/% 偏航机构压力角最大值αmax/(°) 37.28 32.63 -12.47 旋转部件转动惯量J/(kg·m2) 183.12 170.85 -6.70 直线滑块加速度均方根σa/(mm·s-2) 4.62 2.60 -43.72
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