研究表明,遗传算法由于具备良好的进化搜索机制,其寻优效果显著优于蒙特卡洛法。在主激振频率(180阶次)对应的典型工况下,经遗传算法优化修形后,一级齿轮副的传动误差降低51.1%,最大接触应力减小12.8%;动力学仿真中系统最大振动加速度由347.26 m/s
2
骤降至137.98 m/s
2
,降幅达60.26%;试验测得箱体最大振动加速度由997.4 m/s
2
降至581.4 m/s
2
,有效抑制了时变工况下的偏载与异常高频噪声,验证了所提微观修形方案的工程应用价值。
Abstract
Objective
2
To address the prominent dynamic excitation and severe structural vibration issues of an NW‑type planetary gearbox under high‑speed and varying load conditions
a multi-objective micro-geometry tooth modification optimization methodology was investigated.
Methods
2
Firstly
a coupled system dynamic model incorporating a flexible housing
bearing stiffness
and non-linear gear meshing features was formulated using finite element sub-structuring techniques. Secondly
based on the extracted operational load profiles
multi-node steady-state contact characteristics and dynamic transmission errors (DTEs) were resolved via tooth contact analysis (TCA) to identify the baseline misalignments. Thirdly
parametric optimization swings utilizing a linear-weighted comprehensive fitness function were executed via a genetic algorithm (GA) to determine the optimized combination of helix crown
helix slope
and profile modification variables across the sun and planetary gears
the search efficiency of which was comparatively verified against the Monte Carlo random sampling strategy. Finally
test verifications were subsequently conducted on a variable-speed order analysis drivetrain platform to record the chassis vibration accelerations before and after micro-geometry implementation.
Results
2
Parameter sweeps indicate that the evolutionary GA scheme exhibits superior convergence stability and searching accuracy over the statistical Monte Carlo routine. Under the dominant 180th meshing order frequency
implementing the GA-optimized modifications trims the DTE of the first-stage gear pair by 51.1% and minimizes the peak contact stress by 12.8%. Dynamic simulations demonstrate that the peak vibration acceleration of the housing drops from 347.26 m/s
2
to 137.98 m/s
2
yielding a 60.26% reduction. Laboratory order tracking matching the numerical trajectories confirms that the maximum measured vibration acceleration drops from 997.4 m/s
2
to 581.4 m/s
2
which successfully suppresses tooth flank corner contact and substantiates the outstanding engineering applicability for noise
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