A review of the mechanisms of cambering and valley bulging

1991 ◽  
Vol 7 (1) ◽  
pp. 373-380 ◽  
Author(s):  
C. D. Parks
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Cold Period ◽  
Frost Heave ◽  
Primary Mechanism ◽  
Field Evidence ◽  
Cap Rock ◽  
Rock Load

AbstractA study has been undertaken to investigate the mechanism of cambering and valley bulging. Previously proposed primary mechanisms are critically reviewed and discussed. The primary mechanism proposed here is that of frost heave and creep of valley slopes, enhanced by slope erosion and cap rock load during a period of periglaciation, partly at the onset of the cold period but predominantly whilst the ground was in frozen and thawing states. The mechanism is supported by experimental study, a mathematical model and field evidence.

scholarly journals Experimental research method when developing a mathematical model for calculating cutting speed in the course of turning steels with a coated tool

2019 ◽  
Vol 298 ◽  
pp. 00134
Author(s):  
Zhanna Tikhonova ◽  
Evgeniy Frolov ◽  
Dmitriy Krainev ◽  
Alexander Plotnikov
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Experimental Research ◽  
Research Method ◽  
Cutting Speed ◽  
Coated Tools ◽  
Coated Tool ◽  
Cutting Zone

The article is devoted to the description of the experimental research method when developing a mathematical model for calculating the cutting speed based on information from the cutting zone obtained during the test run in the process of turning using steel coated tools as an example. This paper also presents the results of an experimental study which prove the effectiveness of applying the obtained mathematical dependence.

scholarly journals Optimizing air velocity for the underfloor forced ventilation to protect a refrigerated warehouse from frost heaving

2018 ◽  
Vol 38 (3) ◽  
pp. 321-327
Author(s):  
Jingfu Jia ◽  
Manjin Hao ◽  
Jianhua Zhao
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Three Dimensional ◽  
Temperature Fields ◽  
Frost Heave ◽  
Forced Ventilation ◽  
Air Velocity ◽  
Set Up

Forced or natural ventilation is the most common measure of frost heave protection for refrigerated warehouse floor. To optimize air velocity for the underfloor forced ventilation system of refrigerated warehouse, a steady state three-dimensional mathematical model of heat transfer is set up in this paper. The temperature fields of this system are simulated and calculated by CFD software PHOENICS under different air velocity, 1.5m/s, 2.5m/s or 3.5m/s. The results show that the optimized air velocity is 1.5m/s when the tube spacing is 1.5m.

Experimental Study on GH3536 Surface Discharge Mark Diameter of EDG

2013 ◽  
Vol 664 ◽  
pp. 817-820 ◽  
Author(s):  
Ji Gao ◽  
Di Wang ◽  
Yao Sun
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Empirical Formula ◽  
Pulse Width ◽  
Orthogonal Test ◽  
Regression Equation ◽  
Surface Discharge ◽  
Test Analysis ◽  
Peak Current ◽  
The Impact

This article using the method of orthogonal test analysis the law of honeycomb ring part in aero-engineer surface discharge mark diameter by EDG. In the impulse voltage under certain conditions,by changing the peak current and pulse width in the interelectrode study both of the impact of the largest diameter of GH3536 surface discharge mark, and build a mathematical model of the regression equation, derive relatively accurate empirical formula. Provide a good reference and guidance for the actual production of the EDG.

Design and experimental study of the self-adaptive splitting technology of lotus seeds

2020 ◽  
pp. 1-11
Author(s):  
Ange Lu ◽  
Qiucheng Ma ◽  
Jie Ma
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Firefly Algorithm ◽  
Test Bench ◽  
The Self ◽  
Linkage Mechanism ◽  
Lotus Seed ◽  
Medicinal Value ◽  
Splitting Process ◽  
Self Adaptive

The lotus plumule has high medicinal value and is an important part of the lotus seed. Usually, the lotus seed must be split symmetrically into two halves through a splitting process to obtain an intact lotus plumule. However, this process is difficult to mechanize and automate, as different lotus seeds are of different sizes. In this study, a novel automatic self-adaptive splitting technology (SAST) is proposed for lotus seeds, based on a specially designed combined linkage mechanism and a roller pair centering mechanism. The technology can automatically adjust the position of the splitting point taper punch according to the size of the lotus seed and ensure that the tip of the punch is on the axis of the lotus seed. First, the centering deviation of the centering mechanism was analyzed. A mathematical model for the SAST was developed, and the key parameters were optimized using the firefly algorithm. An automatic splitting machine and a test bench were designed for centering deviation measurements, and both centering and splitting experiments were conducted. The generated maximum centering deviation of the SAST was <0.176 mm; the highest accurate splitting rates of 95% and 93.05% were achieved for unclassified and graded lotus seeds, respectively.

scholarly journals Theoretical and experimental study of scour depth by submerged water jet

2016 ◽  
Vol 8 (12) ◽  
pp. 168781401668239 ◽  
Author(s):  
Jiaoyi Hou ◽  
Lishan Zhang ◽  
Yongjun Gong ◽  
Dayong Ning ◽  
Zengmeng Zhang
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Working Conditions ◽  
Curve Fitting ◽  
Functional Relationship ◽  
Water Jet ◽  
Scour Depth ◽  
Experiment Data ◽  
Fitting Method ◽  
Curve Fitting Method

The characteristics and working principles of the impinging by submerged water jet are analyzed, and the relevant mathematical model is optimized based on Rajaratnam’s theoretical and experimental study. A new mathematical model is constructed by adding an important parameter called impinging angle. A new experiment is designed according to the working conditions of various impinging distances and angles. In combination with the experiment data and with the use of the curve fitting method, the functional relationship between the impinging distance and angle as well as the coefficient C4 is obtained. The experiment results show that the scour depth decreases as impinging distance increases, followed by a trend from decline to rise before falling again; those two turning points occur within the range of 20d–25d. The scour depth constantly increases with rising impinging angle, and the maximum and minimum increasing ranges can reach 180% and 50%, respectively, with the impinging angle increasing from 40° to 90°.

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