Measurement and analysis of delivery van vibration levels to simulate package testing for parcel delivery in Hungary

Trunk transportation and terminal distribution are two important parts of express delivery in China. Heavy truck and medium truck are two main vehicles of trunk transportation. Mini van and two‐wheel electric bicycle are widely used for terminal distribution. Four vehicles mentioned previously and a sedan car were chosen for vibration level measurement and analysis in this paper. The results revealed that vibration levels were significantly higher in the vertical axis, and decreased with the increase of payload, and increased with the increase of speed again. Similar power spectral density peak frequencies were found in a comparison study with previous results in the low‐frequency region (1‐10 Hz), occurred at approximately 2 Hz in the van and sedan car and at 3 to 4 Hz in the truck and at 4 to 5 Hz in the two‐wheel electric bicycle. Except the two‐wheel electric bicycle, the second peak frequency occurred at approximately 20 to 30 Hz in the sedan car and at 10 to 20 Hz in the mini van and at 20 to 40 Hz in the heavy truck, which were also similar to the previous studies. Vibration levels of the sedan car were the lowest, and the trunk transportation vehicles (heavy truck, medium truck) were the highest. The terminal distribution vehicles (mini van, two‐wheel electric bicycle) were somewhere in the middle.

Section: Resultsmentioning

confidence: 96%

Section: Analysing Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement and analysis of vibration levels for express logistics transportation in South China

Zhou

Wang

2018

“…The unit of PD is G 2 /Hz, and the calculated data are presented from 1 to 200 Hz in this study. Here, it has to be noted that the noise floor of the SAVER 3X90 is around 0.02 G RMS at a 500‐Hz bandwidth, so the events below this limit were filtered out from the analysis, as previous research has already done . This is in addition to those events that happened during the handlings or transshipments to obtain pure vibration events.…”

Section: Design Of Experimentsmentioning

confidence: 99%

Vibration and acceleration levels of multimodal container shipping physical environment

Böröcz

2019

Self Cite

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.

“…These three representative vehicles were chosen for vibration signal measurements with different payload on the urban road of the Pearl River Delta Region in South China, as shown in Figure . As previous researchers, the undesirable events such as nonvibration featured movements with resultant G rms below 0.03 G were filtered out from the analysis. Table shows the detail information of each measurement.…”

Section: Data Measurementsmentioning

confidence: 99%

Comparison study on simulation effect of improved simulation methods for packaging random vibration test

Zhou

Wang

2018

In general, existing testing methods for packaging design employ Gaussian distributions to represent vibration induced by road profiles. However, the actual road vehicle vibration is non‐Gaussian. The key limitation is that the simulated Gaussian vibration cannot reconstruct the shock events buried in the vibration, which will result in inaccurate reliability evaluation of cushion packaging. A new simulation technique called shock extraction has been proposed and validated in our earlier study. This article is a further study of our previous research. The shock extraction method has been compared with other three representative simulation methods including the single‐level PSD, three‐way split spectral, and wavelet decomposition in terms of simulation effect. Signal simulated by the shock extraction method possesses the same vibration intensity, duration, approximate statistical characteristics, and PSD plots with the original signal. The results show that the simulation effect of the shock extraction method is the best, and the worst is the single‐level PSD. The wavelet decomposition and three‐way split spectral are somewhere in the middle.