Correlation Study Using Scuffing Damage to Investigate Improved Simulation Techniques for Packaging Vibration Testing

Transport vibration levels in trucks were measured as a function of truck speed, road conditions and load level. The trucks consisted of one normally loaded truck and one overloaded truck with leaf-spring suspensions. Truck speeds were divided into three groups: 0-30 km/h, 31-60 km/h and 61-90 km/h. Traffic roads consisted of highways, arterial roads (ARs), secondary roads (SRs) and tertiary roads (TRs). The results revealed that transport vibration levels increased with truck speed; TRs contributed to the highest transport vibration levels, followed by SRs, ARs and highways. The power spectral density peaks were at 3 or 3.5 Hz. Overloading probably suppressed transport vibration levels especially at low speeds.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Measurement of Truck Transport Vibration Levels in China as a Function of Road Conditions, Truck Speed and Load Level

Zhou

Li-ping

et al. 2015

“…Theoretically, signal simulated by the three-way split spectral method has a more approximated statistical characteristics to the original signal comparing to the two-way split spectral method. The wavelet decomposition method gives a best correlation with the benchmark time replication method in a scuffing damage comparison study, 14 and which is also a recently proposed method. Therefore, three representative simulation methods including the single-level PSD, three-way split spectral, and wavelet decomposition are chosen for a comparison study with the proposed shock extraction method in terms of simulation effect.…”

Section: Simulation Methods Chosen For Comparisonmentioning

confidence: 99%

“…• Modulated RMS distribution 9,10 • Wavelet decomposition 11,12 Shires et al 13 established a device to measure scuffing as a response to vibration input, which has been validated and shown to generate repeatable results in laboratory-based studies. Griffiths et al 11,14 investigated the correlation of several improved simulation techniques based on this scuff measuring device. Furthermore, a new simulation method called shock extraction for short has been proposed and validated in our earlier research.…”

Section: • Time Replicationmentioning

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.

“…Shires and White designed a special scuffing device to measure scuffing as a response to vibrational input. Griffiths et al applied the scuffing device to simulate the mechanism of scuffing progression and to make a comparison among different signal simulation methods. In his article, at a degree of scuffing, the relation of test intensities versus time showed a good fitting with exponential function and a good fitting with a power law if the results less than 0.2 G rms was omitted.…”

Section: Introductionmentioning

confidence: 99%

Investigation on vibration scuffing life curves

Wang

Rouillard

2018

The printing images on products and packaging play an important role in increasing the business value, adding artistic quality, and sending information. During transportation, scuffing of the printing images will emerge due to vibrations and impacts induced by rough roads and vehicles. This paper investigates experimentally the vibration scuffing through an ink transfer device. The scuffing value–time curves are obtained. Then the scuffing life curves Grms,e‐Na,e based on excitation acceleration root‐mean‐square (RMS) and Grms,r‐Na,r based on relative acceleration RMS are developed. Both Basquin‐type and exponential‐type curves may be applied to describe the scuffing life in this case. The excitation frequency width covering the resonance frequency has a significant effect on the scuffing life curve Grms,e‐Na,e based on excitation acceleration RMS; however, it is not obvious on the scuffing life curve Grms,r‐Na,r based on relative acceleration RMS. The vibration system filters out the broadband excitation vibration frequencies away from the resonance zone and makes the relative acceleration signal a narrow one. The scuffing life curve in the resonance scuffing state is very different from that in the nonresonance scuffing state, and they should be distinguished in practical application. The scuffing life equations and curves obtained in this paper may provide a reference to the further research on packaging scuffing and its test evaluation and accelerated vibration test in laboratory.