Development of Empirical Correlations Between Shear Wave Velocity and Standard Penetration Value: A Case Study of Rajshahi District, Bangladesh
Md Ashikuzzaman,
Md Shakil Ar Salan,
Md Ashikur Rahman,
Md Mahmudul Hasan
Issue:
Volume 6, Issue 1, January 2021
Pages:
1-6
Received:
15 August 2020
Accepted:
24 August 2020
Published:
4 March 2021
Abstract: In seismic response investigation, shear wave velocity, Vs shows a vigorous role as an input factor. Enormous methodologies have been developed and tested to directly determine this key factor. Direct measurement of Vs is time-consuming as well as highly expensive. As a result, researchers from different regions have tried to reduce the difficulties associated with the measurement and developed empirical relationships between VS and other geotechnical characteristics of the soil, such as SPT calculation, depth, vertical effective pressure, etc. In this paper, the empirical correlation between shear wave velocity and standard penetration number (SPT-N) has been investigated for several soil categories: all soils, sand, silt and clay-type soils. Study area selected for this analysis are Bagha, Bagmara, Charghat, Durgapur, Godagari, Paba, Puthia, Tanore and Rajshahi City Corporation (RCC) area consisting of 36 borehole dataset. Combining all the data, an approach is made to correlate the Vs with the SPT-N. The square value of the coefficient (R2) of correlation shows good agreement with the subsoil. Regression analysis is used to propose an empirical relation for this zone which would be helpful for foundation engineers to have the idea on earthquake response analysis of subsoil.
Abstract: In seismic response investigation, shear wave velocity, Vs shows a vigorous role as an input factor. Enormous methodologies have been developed and tested to directly determine this key factor. Direct measurement of Vs is time-consuming as well as highly expensive. As a result, researchers from different regions have tried to reduce the difficultie...
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Risk Assessment of Computer Numerical Control (CNC) Machine Service Quality
Issue:
Volume 6, Issue 1, January 2021
Pages:
7-16
Received:
25 February 2021
Accepted:
9 March 2021
Published:
22 March 2021
Abstract: The background of this paper stems from the uncertainties related to machine down time can have a very high cost to modern manufacturing organizations in the form of, productivity losses, product lead times, and poor-quality low product yields. The objective of this research is to review applicable risk management systems and identify the most suitable system for CNC maintenance service. Recurrent CNC machine malfunctions can result in major economic losses, poor customer service, and loss of business reputation. Many examples of the occurrences of down time disruption due to machine failure and or maintenance issues are prolific throughout modern organizations. These instances cause process volatility, disruptions to productivity, digital incidents throughout the Industrial Internet of things (known as IIoT) process, which are all contributors to CNC machine down time risk. While “just-in-time” and lean concepts may benefit the organization in general, these concepts may contribute to risk during process stoppages. The identification, assessment and management of risk is the focus of this article. A combination of modern methods and techniques are presented for comparison to identify the most relevant method to use in this research. The method identified in this case is the Analytical Hierarchical Process (AHP) which is then used as the as the method of choice for this research to successfully address and manage the consequences of risks associated with CNC machine down time. The results of this research utilize the selected risk management system of AHP analysis and priority matrix methods. This is then simulated in the model of potential occurrences of variable risks. The estimation of prospective risk factor effects is identified and analyzed for the CNC production process. The outcomes of this research have identified the most appropriate method and tailored it to the CNC maintenance service, therefore enabling the user to execute the quantifiable risk assessment and management techniques.
Abstract: The background of this paper stems from the uncertainties related to machine down time can have a very high cost to modern manufacturing organizations in the form of, productivity losses, product lead times, and poor-quality low product yields. The objective of this research is to review applicable risk management systems and identify the most suit...
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