The aspect ratio is one of the important factors that impact the corrugated box compression strength. In this paper, the three most commonly method that can be used to obtain the corrugated boxes’ compression strength, namely testing method, classic formula method and computer simulation method were compared. Selecting some 0201 BC flute corrugated boxes as the object, on the condition that the cardboard materials, carton height and circumference of the corrugated box is at the same, the compression strength of corrugated boxes which aspect range from 1 to 3 were tested and calculated respectively by compression strength testing method and classical formula. The results show that when the aspect ratio changes from 1 to 3, the compression strength increase at first, and then decrease; the compression strength reach maximum when the aspect ratio at 1.6 or so. The results show that the classic formula calculation data are large deviate from the testing ones. Research shows that due to not fully take into account the influence of corrugated cardboard quality, box forming process, temperature and humidity and other factors, the currently classic compression strength formula are more conservative.
This paper presents the design, modeling, and simulation of an energy-regenerative shock absorber based on dual overrunning clutches for transportation vehicles, to enable energy harvesting from suspension vibration. The energy-regenerative shock absorber consists of three main components: the suspension vibration input, the transmission module, and the generator module. The innovative design of the shock absorber uses dual overrunning clutches, which can convert oscillatory vibration into unidirectional rotation of the generator. The dynamic modeling of the shock absorber is presented to analyze damping characteristics. Simulations were performed to demonstrate the performance of the proposed energy-regenerative shock absorber. A peak output power of 44.73 W and an average power of 22.34 W were attained from this proposed shock absorber at a vibrational input of 2-Hz frequency and 20-mm amplitude. The prototype can achieve 69.19% efficiency at 1-Hz frequency and 15-mm amplitude. The results show that variable damping coefficients are achieved by changing the external load of the shock absorber. As a result, the energy-regenerative shock absorber can be applied to different types of transportation vehicles.
Concrete pump truck is a kind of mobile construction machinery, with the characteristic of complex structure, poor working condition and difficult to maintenance. Therefore, adopting appropriate health monitoring methods, and accurate grasping the running status information of the pump truck is significant to the pump truck’s safety use and pre-judgment maintenance plan arrangement. In this paper, the traditional structural health monitoring methods was studied. And the structure, load and work environment characteristics of concrete pump truck were analyzed. Taking into account the economy and reliability of the structural health monitoring system, the technical route of the concrete pump truck structural health monitoring system and health evaluation criteria were proposed. The evaluation criteria takes into account both the cumulative health effect and timely health status of concrete pump truck structure.
C-flute corrugated paperboards with length of 100mm were combined side by side with/without water soluble glue to study the static edgewise crush property. Combinations with different height (20, 25, 40, 60, 80, and 100mm), different number of layers, with or without glue were tested to obtain mechanical property and buffering property data of C-flute corrugated paperboard. The result indicates that the deformation of paperboard combinations can be divided into three stages as elastic-like deform stage, yield-like stage and high plastic deformation stage. The mechanical model of the elastic-like deform stage was built according to numerical fitting, which shows that the relationship between the stress and the quadratic function of strain is exponential.
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