Experimental study on grain failure of lightweight expanded clay aggregate under uniaxial and biaxial load conditions

2021 ◽  
Vol 383 ◽  
pp. 542-553
Author(s):  
Elías A. Roces-Alonso ◽  
Jesús González-Galindo ◽  
José Estaire
Keyword(s):  
Experimental Study ◽  
Biaxial Load ◽  
Load Conditions

scholarly journals Experimental study on vibration transmissibility of Pre-loaded XPE and PE packaging cushioning material

2021 ◽  
Vol 49 (4) ◽  
pp. 962-968
Author(s):  
Péter Csavajda ◽  
Péter Böröcz
Keyword(s):  
Experimental Study ◽  
Static Load ◽  
Damping Ratio ◽  
Packaging System ◽  
Static Loads ◽  
Resonance Frequencies ◽  
Vibration Transmissibility ◽  
Protective Packaging ◽  
Load Conditions ◽  
Cushioning Material

Most of the shipped products are sensitive against shock and vibration events during the distribution. Various cushioning materials are usually used to prevent the product damages. During the design process the protective packaging system is developed by the engineers based on the cushion and vibration transmissibility features (ie. cushion curve) of the material used. However, after the assembly of the packaged-product, these are stored for various long periods in warehouse. During this time the products pre-load the cushioning material and its parameters can be changed. The main goal of this study is to evaluate the vibration transmissibility of PE and XPE cushioning material at varied storage (pre-loaded) time and static load conditions. Four different kinds of duration (1 hour, 10 hours, 100 hours and 1000 hours) were used for the pre-loading period at three different static loads (3.488 kPa, 4.651 kPa, and 6.976 kPa), and then at 0.5 oct/min sine sweep vibration the peak frequencies of response and vibration transmissibility, and damping ratio were determined. The results show that the effect of pre-loading is minimal by PE material, but can influence the resonance frequencies by XPE cushioning material. The findings of this study help the packaging engineers to understand better the mechanism of these cushioning materials and to design suitable protective packaging systems.

The Study of the Flexural Capacity of Old and New Prestressed Concrete Hollow Slab Strengthened with CFRP

2013 ◽  
Vol 482 ◽  
pp. 66-69
Author(s):  
Bin Jia ◽  
Lei Fu ◽  
Yu Zhang ◽  
Yi Lu
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Engineering Design ◽  
Prestressed Concrete ◽  
Reinforcement Effect ◽  
Flexural Capacity ◽  
Design Specifications ◽  
Secondary Load ◽  
Contrast Analysis ◽  
Load Conditions

Prestressed hollow slab strengthened with CFRP is a new reinforcement method. To study the effect on reinforcement through different carbon fiber paste volume and paste manner, we did the experimental study on flexural capacity under the secondary load conditions with prestressed concrete hollow slab commonly used in engineering. Meanwhile, we also did the contrast analysis of reinforcement effect on the old and new prestressed concrete hollow slab. The results showed that prestressed concrete hollow slab strengthened with CFRP could effectively improve the flexural capacity of the specimen, besides the capacity increasing of the old and new prestressed hollow slab is a little difference, but both of the new and old can meet the engineering design specifications.

Effect of the Ignition Time on the Turbocharged Lean-Burned CNG Engine

2013 ◽  
Vol 712-715 ◽  
pp. 1320-1324
Author(s):  
Xiao Lu ◽  
Da Wei Qu ◽  
Jian Xi Pang ◽  
Ji Fei Lu
Keyword(s):  
Experimental Study ◽  
Boundary Conditions ◽  
Ignition Time ◽  
Nox Emissions ◽  
Emission Performance ◽  
Low Speed ◽  
Output Torque ◽  
Cng Engine ◽  
Load Conditions

Experimental study on the combustion and emission performance of turbocharged lean-burned CNG engine by the ignition time. Speed of the engine is 1340r/min,1615r/min,1890r/min,with 25%, 50%,75%,100% load. Results show that when keeping other combustion boundary conditions unchanged, the effect of the ignition time on engine output torque and CH4 is little,the effect changes as speed varies from low speed and load conditions to higher level.However,the effects of ignition time on NOx emissions are huge.With the backward changes of the ignition time,NOx emissions has decreased significantly.

Selected simulation and experimental study of the CWR track

2019 ◽  
Vol 126 ◽  
pp. 97-110
Author(s):  
Jacek Kukulski ◽  
Jacek Makowski ◽  
Kazimierz Towpik
Keyword(s):  
Experimental Study ◽  
Temperature Change ◽  
Thermal Stresses ◽  
Numerical Models ◽  
Experimental Tests ◽  
Railway Line ◽  
Load Conditions ◽  
Made In

The article presents issues related to the CWR (continuous welded track) and discusses the problems associated with its operation. An important part of the article is the results of simulation tests carried out for the developed model of a CWR track loaded with various values of longitudinal forces that may occur during operation. The forces act in the rail due to the occurrence of thermal stresses with values depending on the temperature change of the rail. In addition to simulation tests, the concept of experimental tests that will be performed on a selected section of the railway line is also presented. The MS-02 device will be used to measure longitudinal forces under various load conditions and to maintain the contactless path. The results of measurements made in the exploited track will be used in the long term to verify and further improve the numerical models.

Theoretical and Experimental Study of the Effect of Varying Load on the Dynamics of a P, MRC or P + PID/x Controlled Electrohydraulic Position Servo System

1989 ◽  
Vol 203 (4) ◽  
pp. 267-274 ◽  
Author(s):  
M T Pietola ◽  
M J Vilenius
Keyword(s):  
Experimental Study ◽  
Position Control ◽  
Servo System ◽  
Good Method ◽  
Load Flow ◽  
Control Methods ◽  
Static Properties ◽  
Model Reference Control ◽  
Develop System ◽  
Load Conditions

The effect of varying load conditions on dynamic and static properties of a flexible electrohydraulic position control servo system is investigated theoretically and experimentally in this paper. Three different control methods were used. P control was taken into the research as a reference. P + PID/x; was used because it is a good method of damping the oscillations of flexible servos. Model reference control (MRC) was included as a new possible method of getting good dynamic results. In the mathematic analysis the aim was to develop system models that are not too complicated but still describe well this kind of heavily loaded flexible servo system. The non-linearities included were the dead band and saturation of the valve and the non-linearity of the load flow.

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