共查询到20条相似文献,搜索用时 31 毫秒
1.
目的 在常温下通过控制低气压和振动双危害因素,研究一种模拟运输的试验方法,用于评估物流包装对产品的保护性能.方法 研发一种低气压振动试验装置,将其与振动系统相结合,在实验室内模拟高原运输或飞机运输中的低气压环境条件.实现一种能够在特定的温湿度下控制低气压和振动综合环境因素的试验方法.结果 低气压振动试验系统能够满足ISTA 3A中的试验要求,根据国内外低气压试验标准和随机振动试验标准,制定了低气压振动综合试验方法.结论 对于评价高海拔卡车、铁路和航空运输包装件的模拟试验提供了可行性依据. 相似文献
2.
3.
目的 研究打印机物流包装方案在运输过程中对打印机的防护性能。方法 对打印机整体包装件进行模拟公路运输路况的随机振动试验,得到产品的响应加速度谱密度曲线;然后建立打印机物流包装的三维模型,通过运用有限元软件Ansys Workbench中的随机振动分析模块(Random Vibration)对整体进行随机振动仿真分析,得到打印机的响应加速度谱密度、总位移、各向应力、等效应力等。结果 由仿真得到的响应加速度谱密度与试验结果相对比,其变化趋势一致,验证了仿真的可靠性,同时验证了该打印机包装方案具有良好的保护性能。结论 该打印机整体包装方案满足公路物流运输的防护要求,同时提供了一种物流运输包装方案的可靠性验证方法。 相似文献
4.
5.
包装件中易损零件对随机振动环境的响应 总被引:1,自引:1,他引:1
简要地论述了随机振动的基本概念和振动量的均方值。根据实验得出的功率谱密度曲线,应用简谐振动理论求解易损零件对随机振动环境的响应,用简捷方法,导出了由激励到响应的功率谱密度公式和均值公式。为分析包装件的随机振动提供了简单而又科学的方法。 相似文献
6.
7.
包装件中易损零件的振动规律 总被引:1,自引:0,他引:1
根据包装件动力学模型,导出包装件受简谐激励时的易损零件振幅公式。先不考虑零件阻尼,分析衬垫阻尼比和刚度比对易损零件振动的影响,然后分析易损零件的质量比和阻尼比对自身振动的影响。在上述分析的基础上,总结了易损零件振动的基本规律。 相似文献
8.
目的使蝙蝠算法(BA)适应包装件配送车辆路径问题(VRP)的求解,并提高该算法的求解性能。方法在标准BA算法的基础上提出混合蝙蝠算法(HBA)。首先,设计改进的蝙蝠算法(IBA),使其能够适用于包装件配送VRP问题的求解。其次,引入混沌系统,对IBA算法进行混沌初始化。然后,设计裂变算子和变异算子。在IBA算法迭代前半段,将蝙蝠种群中较差的一半蝙蝠重新混沌初始化,以提高种群多样性。在IBA算法迭代后半段,对陷入局部最优解的蝙蝠进行鲶鱼扰动。最后,提出HBA算法并对企业实例进行仿真测试。结果 HBA算法求得的最优配送距离为773.01 km,相对于GA算法(781.25 km)和IBA算法(786.04 km)分别节约了8.24 km和13.03 km。结论与IBA算法和GA算法相比,HBA算法求解包装件配送VRP问题的全局优化能力更强、收敛速度更快。 相似文献
9.
果品物流运输包装件堆码振动传递性能的实验研究 总被引:2,自引:1,他引:1
以贵妃富士苹果为测试对象,模拟了其在实际运输过程中的振动载荷,进行了运输包装单件扫频振动实验,测出了其固有频率;对10层堆码进行扫频振动传递性能实验,分别测出了底层、中间层(第6层)和顶层运输包装件的固有频率、最大响应加速度和振动传递率。最后探讨了最大响应加速度、振动传递率随时间的变化规律,分析了固有频率和振动传递率峰值与堆码高度之间的关系,研究了其在模拟振动条件下的损伤规律,找出了现有包装的不足,提出了合理的包装设计方案。 相似文献
10.
11.
This paper describes a method to predict the vertical vibrations of road vehicles from measured pavement profiles. It discusses the limitations of current methods used for analysing and simulating vehicle vibrations and shows that more accurate characterization and simulation of the transport environment must take into account the non‐stationary nature of road vehicle vibrations. Vertical vibrations for typical transport vehicles under various operating conditions and pavement profiles are predicted using a computer model of the vehicle characteristics and analysed to produce the spectral and statistical characteristics. The paper also presents an improved method to compute the vibration intensity by using a dynamic segmentation data reduction technique. The effectiveness of the procedure to characterize the non‐stationarity of random vehicle vibrations is demonstrated. Finally, the paper deals with the statistical distribution of the vibration intensity and demonstrates how it can be adapted to a technique for the simulation the non‐stationary nature of random vehicle vibrations. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
12.
Transport packaging of products is a complex structural system, having a variety of modes for vibration damage failure under the action of random vibration in logistics. In order to evaluate the packaging performance effectively, the accelerated random vibration testing becomes one of important tools. This paper develops a more general and practical method for accelerated random vibration testing of transport packaging in the framework of linear random vibration of discrete packaged product. The suggested method is based on the response acceleration power spectral density (PSD) of component which is easy to measure, and suitable for the different fatigue models more than Basquin fatigue model. It is confirmed by the experiments of a packaged desk computer that exerted two types of acceleration PSDs. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
13.
目的采用改进包装的方式降低乘客安全气囊(PAB)工厂包装件的运输危险性。方法依据乘客安全气囊在联合国外部火烧试验(UN6c试验)的结果,结合LS-DYNA动力有限元软件的分析,先后采用网格式和条栅式金属丝网笼包装控制金属迸射物的产生。结果条栅式金属丝网笼包装成功束缚了所有动能大于8 J和动能大于20 J的金属迸射物,使乘客安全气囊工厂包装件成功通过了联合国外部火烧试验。结论改进后的包装符合联合国关于危险货物运输的建议书(TDG)中对危险品包装的有关要求,将原分类为第1类(爆炸品)的乘客安全气囊工厂包装件降低为第9类(杂项危险品),使乘客安全气囊(PAB)工厂包装件适合更多形式的运输。 相似文献
14.
S. Paul Singh Gary J. Burgess Jorge A Marcondes John R. Antle 《Packaging Technology and Science》1993,6(4):175-181
The dynamic and climatic environments inside the cargo holds of regrigerated ships carrying bananas from Central America to destinations in Europe and the United States were measured. The same environments inside individual packages of bananas were also measured for comparison. Among the variables studied were shock and vibration G-levels, temperature, humidity, and air velocity. Three different types of shipments were monitored: break-bulk, palletized, and containerized. The results show that the average G-levels are similar to those found on trailers and railcars and that the vibration levels in the packages themselves were amplified by up to as much as eight times. 相似文献
15.
一种多维振动测量系统 总被引:2,自引:1,他引:1
目的 对枪炮管口的多维振动的线位移和角位移进行测量 .方法 采用光电探测的方式 ,进行多参量同步测量 .结果 对数学模型进行了仿真 ,得到了较为精确的结果 .结论 验证了数学模型的正确性 .这种多维测系统有待进一步用硬件实现 相似文献
16.
Harri Mostyn 《Packaging Technology and Science》1988,1(2):99-103
The principle of uniformity in national and international transport regulations has now been widely recognized and implemented. Most features of the regulations are now fully operational e.g. in respect of classification, permitted packagings and maximum quantities, labelling etc. So far as packaging standards are concerned, 1990 is scheduled as the end of the transitional period. The major problem anticipated, that of the vast numbers of combination packagings needing testing and certifying, has hopefully been reduced to a level consistent with safety by the development of the UN limited quantity provisions, their adoption in the IMDG Code and the similar provisions in RID/ADR. The outstanding questions relate to air transport. Non-specification packagings have been acceptable in air transport under the transitional packaging arrangements since the ICAO Technical Instructions came into effect in 1983/84: these are often far larger in size than those covered in Chapter 15 of the UN Recommendations. As far as is known, the use of these non-specification packagings has not given rise to problems in air transport. It is hoped that the ICAO Dangerous Goods Panel will adopt practical limited quantity provisions from 31 December 1990. 相似文献
17.
摘要:交通系统引起周边环境振动,其观测数据中往往含有本底成分。针对本底成分对真实振动的干扰问题,提出对观测功率谱修正的方法以去除本底振动。假设真实振动与本底振动为互不相关的随机过程,推导了功率谱修正法计算公式,并通过算例考查了方法的有效性。首先,取一条振动记录设定为真实振动曲线,与本底振动记录叠加合成振动数据以模拟现场观测记录。然后假设真实振动未知,分别采用振动级修正法、谱幅值修正法及功率谱修正法估计真实振动曲线。比较计算曲线与设定曲线,判断方法的可行性与准确性。算例显示,功率谱修正法计算的时程、功率谱与设定曲线符合良好,误差低于谱幅值修正法;功率谱修正法、振动级修正法计算的振动级与设定值基本一致,谱幅值修正法计算值略低于设定值。结果说明功率谱修正法克服了振级修正法不能计算时程和功率谱的不足,并且计算结果优于谱幅值修正法。 相似文献
18.
Pter Brcz 《Packaging Technology and Science》2019,32(6):269-277
In global supply chains, multimodal transportation plays a dominant role in worldwide shipping. The rail, truck, and vessel combination is the most commonly used mode for non‐time sensitive shipments between continents. This study focused on measuring the transportation environment effects (vibration and acceleration levels) in 40‐foot ISO container shipments using multiple modes of transport, originating in Hungary and destined for Mexico, India, and China over several weeks. The study also measured multimodal shipping routes without vessel transportation to China over Trans‐Siberian and Trans‐Manchurian railway lines. The transshipments and handling events in container hubs and terminals were separately analyzed. The results show the comparison of vibration intensity (in PSD) of different route conditions between various continents, and the possibility of acceleration levels during transshipments and handling events. The measured data show that extreme acceleration levels in vertical direction (9.37 G) occur while containers are handled in a seaport, and in lateral (4.45 G) and longitudinal (5.55 G) directions while they are transshipped by truck to rail container terminals. The rail vibration levels in Russia and China showed a lower intensity in the frequency range of 1 to 15 Hz, and higher between 15 and 200 Hz than in Europe; the lowest vibration levels occurred when the containers traveled on the sea, and truck vibration levels were very similar to previous research and ISTA protocols. 相似文献
19.
20.
目的研究三自由度半正定系统在随机振动条件下的加速度动态响应以及加速度功率谱密度。方法以运输包装中常见的三自由度半正定系统为原型,建立了三自由度半正定系统的质量-弹簧-阻尼系统。依据美国ASTM-D4728随机振动标准,利用Matlab/Simulink仿真平台,建立仿真模型,并输入模型参数,得到了三自由度半正定系统随机振动下的动态响应。基于相同试验标准进行试验,对比分析试验结果与仿真结果的差异。结果在低频段内(小于80 Hz),Simulink仿真模拟随机振动的加速度功率谱密度值与随机振动试验的加速度功率谱密度值的相关性系数达到0.983,加速度功率谱密度值最大处仅相差8.8%。在高频段内(大于80Hz),Simulink仿真模拟随机振动的加速度功率谱密度值与随机振动试验的加速度功率谱密度值的相关性系数只达到0.745,加速度功率谱密度值最大处相差13.1%。结论利用Matlab/Simulink仿真平台分析包装系统的低频随机振动是一种简单可行的方法,一定程度上可以作为随机振动试验的代替手段。 相似文献