关键词： 齿轮箱漏油检测   师生蒸馏   深度学习   计算机视觉  

摘要： 齿轮箱作为机械设备中的关键组件,对于整个系统的稳定性和效率至关重要。齿轮箱漏油导致维护成本增加,更有可能引发设备故障甚至事故,严重威胁生产安全。本文提出了一种基于深度特征融合和师生蒸馏模型的齿轮箱漏油检测方法,同时提取深度图与2D图像的特征并融合,以获得更优异的特征表示。在多个真实齿轮箱漏油数据集上进行了实验,实验结果表明,与现有的齿轮箱漏油检测技术相比,本文提出的方法在检测准确率和实时性方面均有显著提升,平均检出率达到94.5%,检测速度为每帧0.048s,具有良好的应用潜力。

关键词： Flexible couplings  

摘要： The flexible deformation of gear teeth induces the collision of gear pair, which affects its transmission quality and dynamic performance. This paper calculates the actual meshing contact ratio of gear pair by considering the gear teeth flexibility, the rigid-flexible coupling time-varying meshing stiffness, and load distribution coefficient of gear pair. The meshing-impact dynamic model and impact-collision energy dissipation model of spur gear system considering rigid-flexible coupling were established. The influence of gear teeth flexibility on contact ratio, time-varying meshing stiffness and dynamic meshing force was analyzed. Based on the multi-initial value bifurcation diagram, the bifurcation and evolution of the coexistence motion of the system with the change of load and the influence relationship with the energy dissipation were studied, and the maximum energy dissipation characteristics of the system when the two parameters change were revealed. It is found that the gear teeth flexibility affects the meshing area of single and double teeth and increases the contact ratio. The gear teeth flexibility reduces the dynamic meshing force and makes the time-varying meshing stiffness transit smoothly when the single and double teeth are engaged alternately. The impact of drive-side and back-side aggravates the impact energy dissipation of the coexistence motion. The change of load has a great influence on the bifurcation evolution of the coexistence motion of the system, and the change of the coexistence motion affects the impact energy dissipation characteristics of the system. Reasonable matching of the parameters and the initial values can effectively avoid the large impact energy dissipation and improve the reliability of the transmission system. © 2025 Chinese Vibration Engineering Society. All rights reserved.

关键词： 刀片   赤色   井然有序   腐蚀   齿轮   咀嚼   粉碎机  

摘要： 一机器人排队走进粉碎机。赤色的粉碎机张开血盆大口,齿轮和刀片在口腔里旋转,铁锈在腐蚀这些庞大的机械,减缓了吞咽和咀嚼的速度,可碾碎一个机器人,依旧不费吹灰之力。机器人排着长长的队,井然有序,稳步前进,在被吞咽之前还谈笑风生,就算一条手臂和半个脑袋被切掉,他们依旧在谈论难得的好天气。

关键词： 齿轮故障   小波阈值   一维卷积神经网络   脉冲神经网络   诊断分类   抗噪性能  

摘要： 针对提高齿轮在少训练集条件下故障检测的准确率和在复杂噪声环境中的抗噪性能,提出一种基于小波阈值、一维卷积神经网络(1DCNN)和脉冲神经网络(SNN)进行齿轮故障诊断分类的设计方案。首先,将齿轮故障信号通过小波阈值去噪处理;然后,利用1DCNN从处理过后的信号中提取特征;最后,利用多层脉冲神经网络对去噪后的数据进行训练得到诊断分类结果。为了检验该方案的诊断效果,利用美国康涅狄格大学齿轮数据集进行验证,并与其他方法进行对比分析。实验结果表明,该方法在少训练集和加入噪声的条件下具有较好的识别准确率和抗噪性能。

关键词： 参数化建模   纵向重合度   传动误差   NSGA-Ⅱ算法   多目标优化  

摘要： 针对弧齿锥齿轮目前存在传动误差较大、接触温度高、接触赫兹应力大等问题,提出一种基于参数化建模和非支配排序遗传算法的优化方法。首先,基于Kiss soft软件对弧齿锥齿轮进行参数化建模,以清晰描述其参数变化特征;其次,以弧齿锥齿轮的螺旋角、压力角、齿宽作为优化变量,传动误差、纵向重合度作为目标函数,构建基于第二代非支配排序遗传算法(NSGA-Ⅱ)的弧齿锥齿轮多目标参数优化方案。仿真结果表明,优化后的齿轮副纵向重合度提高至21.92%,同时传动误差、接触温度、接触赫兹应力分别减小了46.90%、23.69%、32.19%。该优化设计显著提高了齿轮副传动的平稳性,降低了振动和噪声,延长了齿轮寿命,提高了齿轮的承载能力、传动效率和可靠性。

关键词： 方向   黄黄   转圈圈   齿轮   红红   箭头  

摘要： 齿轮红红和黄黄经常在一起玩转圈圈的游戏。今天,它们又抱在一起玩了起来。这次,红红先转圈圈,它会推着黄黄往哪边转呢?请你给标示正确方向的箭头涂上喜欢的颜色吧!

关键词： 折叠车   产业革新者   森地客   洛克兄弟  

摘要： 从大行折叠车颠覆城市通勤模式,到洛克兄弟打破装备“过度专业化”壁垒,再到森地客把“中国风”带入巴黎博物馆——这群破风者证明:中国骑行的进化,始于对产业基因的重写。他们用技术专利代替价格战,用设计语言解构功能主义,在看似固化的制造业里凿出一条新赛道。在这里,每项创新都在追问:骑行领域的未来是什么?

关键词： 齿轮箱   润滑   机械传动系统   计算流体动力学  

摘要： 齿轮箱润滑系统是机械传动系统不可或缺的部分，面对高速、高负载等工况时，如若润滑措施不当，极易发生润滑不良问题，直接影响齿轮传动系统的效率。因此，采用计算流体动力学（Computational Fluid Dynamics, CFD）对齿轮箱润滑技术进行研究有重要的意义。在分析总结国内外研究成果的基础上，介绍了齿轮箱润滑模型的研究进展，分别从CFD方法及网格处理技术、湍流模型、考虑振动及温度影响、试验研究等方面描述了齿轮箱润滑技术的研究现状，探讨了齿轮箱润滑技术的未来发展方向。旨在为后期全面研究齿轮箱润滑体系，改善齿轮传动系统寿命、提高齿轮传动系统综合性能提供参考。

关键词： Modal analysis  

摘要： The contact stiffness has an important influence on the intrinsic properties of a structure. In order to accurately establish the dynamic model of the contact surface between the spiral bevel gear and the connector, the modal frequencies and modal vibration shapes of the gear and connector assembly were extracted through modal experiments. A finite element model of the gear and connector assembly was established, the distribution of the contact pressure under different preload was analyzed, the contact main region and contact subregion were divided, and 3-way equivalent stiffness spring units were established respectively. The comparison between the analysis and experimental results shows that the stiffnesses of the contact main region and the contact subregion have a great influence on the modal frequency of the structure as a whole. The spring stiffnesses were analyzed by using the technique of modal frequency sensitivity analysis, and the main spring stiffnesses affecting the modal frequency of the structure were identified. With the experimental modal frequency as the target to modify the main spring stiffness, the maximum relative error of the corrected modal frequency is reduced from 4. 25% to 1. 83%, which significantly improves the accuracy of the model. The research method lays a foundation for the accurate dynamic characteristic analysis of spiral bevel gears and its further structural optimization and vibration reduction. © 2025 Chinese Vibration Engineering Society. All rights reserved.

关键词： Bending (deformation)  

摘要： The deformation of helical gear teeth will make the paired gears enter into meshing in advance or secede laggingly, lead the meshing point of gear to deviate from the theoretical position and produce the impact of approach or recess. The impact phenomenon of entering or exiting meshing in helical gear transmission can be reduced or avoided by using the modified tooth profiles. A calculation model for gear meshing stiffness, length of tooth contact line and load distribution coefficient was established based on the mechanism of gear contact and the slice method, considering the contact stiffness of tooth surface and the extended meshing phenomenon caused by tooth bending deformation. The proposed method was used to study the meshing stiffness and fluctuation characteristics of helical gears under different modification parameters and external loads. Compared with the results in the literature, it is shown that the proposed method can calculate the meshing stiffness of helical gears more efficiently and accurately, and obtain the internal relationship between the meshing stiffness fluctuation coefficient and the tooth tip modification parameters and the transferred load. © 2025 Chinese Vibration Engineering Society. All rights reserved.