The Research On Cab Environmental Comfort Of Large-tonnage Mining Dump Truck

In order to promote the development of China's self-owned brand,and accelerate the enterprises to strengthen their research and development,the State Council published sixteen major key areas of technical equipment during the 12 th Five-Year-Plan period,in where the mining dump truck was included.A lot of work on the structure and performance of mining dump truck have been done by the researchers at home and abroad.But the research of its cabin environmental comfort has not been paid much attention.With the improvement of people's environmental and healthy consciousness,the environmental comfort of working place gets more and more attention.Mining dump truck cab is a relatively closed and narrow space,and the driver has been in such a space for a long time.If there is not a good thermal comfort in the cab,the spirit trance and concentration problems of the driver will be easy to appear,which may result in safety loophole.Because of the bad working condition,the high concentration of dust particles can easily get in the cab from the outside.If the dust concentration indoor exceeds the bid,there will be a strong impact on the people's health,even cause respiratory and lung diseases.Therefore,the research of mining dump truck cabin environmental comfort is of great significance.This article based on a large tonnage mining dump truck as the research object.At first,based on the analysis of thermal comfort,its required air conditioning refrigeration power was calculated.Meanwhile,combined Computational Fluid Dynamics method with the visualization of the PMV-PPD thermal comfort evaluation index,the cabin thermal comfort about the air conditioning performance parameters under multiple working conditions were evaluated and analyzed.Then the driving indoor dust concentration distribution and migration regularity were researched based on Euler-Lagrange method.Finally,the air conditioning pipe structure was optimized.This article mainly focuses on:1.The definition of the environmental comfort based on the cabin thermal comfort and dust pollution was proposed.And some research related to the two aspects has been done,such as the influence factors,evaluation standard,and the numerical calculation method.2.The analysis about heat transfer characteristics of the cab was analyzed,and the car air conditioning refrigeration power was calculated to verify whether therefrigerating capacity satisfy the thermal comfort requirements.Afterwards,the calculation of transient temperature field balance in the cab was made through FLUENT to analyze the change regulation of the inner temperature over time in different conditions.Then it analyzed the cabin internal air distribution,the researches of the thermal comfort about different fan air volume and air supply temperature conditions by using the UDF programming of PMV-PPD.Ultimately,the optimum matching scheme was acquired.3.The DPM model of the flow of dust particles is described by FLUEN.Through the flow of the transient simulation of the cabin internal airflow and dust,the article obtained the migration law of dust.Based on this law,a fast dust removal mode is designed.Finally,the dust concentration distribution in the cab was analyzed in the steady state calculation,the rationality of dust concentration distribution in the area of occupant breathing area was studied.4.On the basis of the above research,with the comprehensive consideration of the cab thermal comfort and dust concentration distribution,the air conditioning duct has been optimized,and a design scheme combined CFD simulation analysis with numerical optimization algorithm was proposed.The environmental comfort of the driver had a substantial improvement.