Simulation and analysis on the ship energy efficiency operational indicator for bulk carriers by Monte Carlo simulation method

The ship energy efficiency management is an important topic in the field of the energy management onboard and the exhaust gases emission nowadays.The advanced model plays a vital role to improve the ship energy efficiency management when considering the variable factors.The establishment of the ship energy efficiency model through energy efficiency operational indicator(EEOI)index has been conducted through Monte Carlo simulation method along with using the operation data of a bulk carrier.A bulk carrier is chosen,namely,M/V NSU JUSTICE 250,000 DWT of VINIC Shipping Transportation Company in Vietnam.This research uses the real operational data to perform a statistical methodology which calculates the various factors used to calculate EEOI.This method is supported by Matlab program through the curve fitting tool.The normal distribution estimation and the kernel density estimation method are used for the parametric curve fitting and non-parametric curve fitting,respectively.The average weather condition(wind speed and wave height)and the fouling condition of hull have been investigated and compared with the research results.The validation of the proposed methods has been conducted through the study of the external factors influencing the research results.The research result shows the optimal operational data for the fuel consumption at each certain voyage.This paper is useful for the ship-owners and the ship-operators in the field of the ship energy efficiency management.

Design and experiment of automatic garlic seed directing device

Garlic planting requires a single seed with a scaly bud upward and vertically.In this study,an automatic garlic seed directing device was designed for auxiliary garlic seeding by utilizing a seed placed funnel,a correcting mechanism,and an automatic control system.Three factors influenced device performance:characteristics of garlic seeds,limited notch diameter of the seed placed funnel,and funnel taper of the seed placed funnel.The most optimal structural parameters of the seed placed funnel were determined via theoretical analysis.The research samples of Lanling and Jinxiang garlic were divided into three groups according to their respective sizes.3D design software(Solidworks)was used to simulate the above three factors and analyze their rules of action.The obtained simulation results demonstrated that the suitable range of funnel taper and limited notch diameter of seed placed funnel for the three groups of seed were from 40°to 60°and 6-8 mm,respectively.The bench test showed that when the funnel taper was 60°and the limited notch diameter was 10 mm,the success rates of the three groups’seeds in terms of scaly bud directing were 89.8%,91.6%and 96.6%respectively,which satisfied the agricultural requirements of garlic planting.Accordingly,the corresponding results may promote the study and improvement of garlic intelligent planting equipment.