共查询到19条相似文献,搜索用时 99 毫秒
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为控制滚筒洗衣机瞬态脱水振动,建立了带有磁流变阻尼器的滚筒洗衣机平面振动模型;通过数值求解,分析了脱水过程按指数规律启动时,系统最大振幅随加速时间常数的变化;讨论了不同稳态转速下,系统最大振幅平均值随衣物负载质量和阻尼器控制电流的变化,结果表明:磁流变阻尼器控制电流对系统最佳加速时间常数的影响不大,对于1~9 kg的衣物而言,采用0.7的加速时间常数可取得较好的综合控制效果。此外,为综合考虑悬挂系统的瞬态抑振与稳态隔振,提出一种简单的磁流变阻尼器控制策略:采用短时傅里叶变换追踪盛水桶振动频率,当该频率大于预设的基准频率后,将阻尼器控制电流从最大降为最小以取得较好的隔振效果,最后,通过仿真验证了该策略的有效性。 相似文献
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针对某型号滚筒洗衣机的滚筒结构特点,运用Pro/E软件和有限元软件ANSYS对洗衣机在高速脱水工况下进行结构动力分析,并进行离心载荷作用下的模态分析,得到受力和变形情况以及固有频率和振型。根据分析结果,得出危险位置和临界转速,并对滚筒组件提出了改进建议。 相似文献
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从滚筒洗衣机结构与运行过程的力学特性出发,结合滚筒洗衣机噪声测量的结果,发现了衣物随机形成的不平衡质量是滚筒洗衣机噪声测试结果具有不确定性的原因.这些随机的不平衡质量在洗衣机运行过程中产生了随转速变化的离心力激起洗衣机的随机振动,并引发随机的噪声.为此,提出了改进滚筒洗衣机噪声测量与评价方法的建议. 相似文献
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《中国新技术新产品》2021,(1)
为了解决滚筒洗衣机脱水时因负载分布不均匀带来振动大的问题,该文研究了平衡环减震原理,创造性地提出了2种平衡环技术并将其应用于实际产品中:1)钢球平衡环+液体平衡环混合技术。2)多腔多环平衡环技术。该技术可以在不增加配重(甚至可以减小配重)的情况下使滚筒洗衣机满足整机的脱水振动性能。该项技术的成功应用为今后滚筒洗衣机在减振降噪方面的研究提供了技术指导。 相似文献
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应用统计能量法对系统瞬态响应的研究 总被引:1,自引:0,他引:1
用统计能量法研究了脉冲激励下两自由度系统的瞬态响应,得出了响应的峰值能量和上升时间的解析式,并对其进行了数值分析。研究表明:减小振子间的耦合刚度和增大振子的内损耗因子,能够有效减小响应的峰值能量;通过增大内损耗因子和耦合刚度,可以减小振子之间的能量交换。这些结论与传统方法给出的结果一致,而瞬态统计能量法比传统方法更为简洁。 相似文献
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滚筒洗衣机硬界面视觉用户体验VUX系统设计研究 总被引:2,自引:2,他引:0
目的通过对视觉用户体验理论的研究,探究现有滚筒洗衣机硬界面设计的规范及原则与用户行为逻辑之间的关系。方法通过对用户行为、情感、逻辑与认知的深入研究以及视觉用户体验理论的探讨,结合类比、整合的方法以及对用户行为逻辑与使用习惯的剖析来研究滚筒洗衣机硬界面设计的规范与原则。结论在视觉用户体验的大潮流下,滚筒洗衣机硬界面设计需充分考虑用户的行为特征与使用逻辑,以用户的行为习惯以及信息的视觉逻辑来提出滚筒洗衣机硬界面定制的规范和原则,并以此来提出规范化和具有品牌延续性的交互设计和用户体验方法,从而提升用户对滚筒洗衣机硬界面操作的熟悉度以及对品牌的忠实度。 相似文献
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如果你挑选洗衣机还只是看搅拌能力或是浸泡效果,那你就out了.市面上出现了越来越多拥有智能化洗衣功能的产品,甚至一些洗衣机还具有USB插口以满足将来软件更新的需要。 相似文献
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Edward D. McDowell 《IIE Transactions》1987,19(3):289-295
Many authors have proposed models for the optimal design of control charts for the control of the defect rate for industrial processes. These models have limited the alternatives available subsequent to sampling to either rebuilding the process, or continuing to operate the process in its current state. Although the cost of rebuilding the process is treated as an adjustable parameter in these models, it can not be a negligible amount. If it were, the obvious optimal strategy would be to rebuild the process, possibly without samplings, after each batch or unit produced. This paper considers the determination of the optimal sample size and sample interval for the case where the process does not have to be rebuilt, but rather may be simply adjusted at a nominal cost after each sample. A model, which assumes a continuum of process fraction defectives, is developed and then used to explore the effect of fixed and variable sampling cost, specification limits and measurement errors on the optimal sampling policy and costs. 相似文献
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BTO的实施策略与流程设计 总被引:1,自引:1,他引:0
按顾客订单生产(Build-to-Order,BTO)是破除大量生产弊端、提高顾客服务水平的新型运作战略,但其成功推行尚缺乏理论指导和成熟经验供借鉴.以一家大型客车制造企业为对象,通过现场实证调查方法,深入研究了采用按订单生产模式所需要的实施策略和流程设计要点,并阐述了相应的管理涵义.调查结果和分析结论有助于企业运作模式转型与订单履行策略的选择决策. 相似文献
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以研究操作者的技能水平为目的,对操作者状态进行测定。应用多元回归分析,从测定中推定操作者的技能水平。其结果表明操作者的状态与技能水平有着极为密切的关系,从而得出操作者的技能水平可由其状态来推定这一结论。 相似文献
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干式复合机张力控制的研究 总被引:3,自引:1,他引:3
论述了溶剂型干式复合的工艺及其张力控制的内容和特点,通过现场测量和验证得到满足生产要求的张力控制曲线,实现了生产过程中张力的有效控制. 相似文献
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1引言 有源噪声控制分为有源声控制和有源力控制两种,前者指的是利用声源作为"反"声源产生次级声场,控制原噪声场;后者指的是直接在振动结构(初级结构)上施加作用力(次级力源),改变结构响应,从而拟制声辐射功率.虽然这两种控制方式在特定的场合能够取得良好的控制效果,但它们共同的缺点是需要位于远场的声学传感器检测声学量作为误差信号,构成控制系统的目标函数,同时系统配置强烈依赖于初级源和声空间的具体形式,使得建立的有源控制系统通用性很差,这给该技术的推广应用带来严重限制. 相似文献
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This paper presents strategies for an automated control of distortion at the operational level of a production process chain, as well as first steps towards a combined implementation in heat‐treatment processes. In order to minimise the loss of production due to quality defects, the first quality control loop will be implemented on an in‐process level. The second control loop within the reach of operational control includes the feedback of post‐process measurements of quality features. As such, the post‐process control loop optimises the set‐values of the in‐process control loop. 相似文献
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In the present study, three dimensional (3D) numerical modeling strategies of a thermosetting pultrusion process are investigated considering both transient and steady state approaches. For the transient solution, an unconditionally stable alternating direction implicit Douglas-Gunn (ADI-DG) scheme is implemented as a first contribution of its kind in this specific field of application. The corresponding results are compared with the results obtained from the transient fully implicit scheme, the straightforward extension of the 2D ADI and the steady state approach. The implementation of the proposed approach is described in detail. The calculated temperature and cure degree profiles at steady state are found to agree well with results obtained from similar analyses in the literature. Detailed case studies are carried out investigating the computational accuracy and the efficiency of the 3D ADI-DG solver. It is found that the steady state approach is much faster than the transient approach in terms of the computational time and the number of iteration loops to obtain converged results for reaching the steady state. Hence, it is highly suitable for automatic process optimization which often involves many design evaluations. On the other hand sometimes the transient regime may be of interest and here the proposed ADI-DG method shows to be considerably faster than the transient fully implicit method which is generally used by the general purpose commercial finite element solvers. Finally, using the proposed steady-state approach, a design of experiments is carried out for the curing characteristic of the product based on pulling speed and part thickness. 相似文献