| With the improvement of people’s living standards,cars have become an essential travel tool for people,and the ride comfort of cars is getting more and more attention.At present,some passengers report that when riding a domestic car,the ears are obviously uncomfortable during the closing process.During the process of closing the door,a large amount of gas is instantaneously squeezed into the passenger compartment,and the resulting steep pressure acts on the eardrum of the human ear,which causes deformation of the eardrum,thereby causes the occupant to feel uncomfortable such as ear tingling and even tinnitus and headache.The research results of this phenomenon at home and abroad are scarce.Therefore,this paper studies the factors affecting the pressure change in the passenger compartment during the door closing process,and proposes effective solutions.Firstly,the Mira car model is taken as the research object,the interior of the model is optimized and the human body model is added.The flow field of the driver’s side door was closed at angular velocities of 2 rad/s,2.5 rad/s,3 rad/s,3.5 rad/s and 4 rad/s.The simulation results showed that the door was closed at 2 rad/s.When the door is closed at other speeds,it will cause occupant discomfort.And as the closing speed increases,the pressure at the occupant’s ear increases almost linearly.Secondly,the factors affecting the pressure in the passenger compartment during the door closing process are studied.The effects of the number of members and the opening of the sunroof on the pressure in the passenger compartment were studied separately.In the fifth chapter of this paper,when the driver’s side door is closed at an angular velocity of 4 rad/s,the number of occupants is from 1 to 5 respectively.The simulation results show that the change in the number of occupants does not change positively with the pressure in the passenger compartment.When the number of occupants in the passenger compartment is an odd number,the pressure at the monitoring point of each occupant’s ear in the passenger compartment is small.When the number of occupants is 5,the pressure peak at each monitoring point in thepassenger compartment is the smallest.There is no feeling of discomfort in the ears.When the sunroof is opened,the gas in the passenger compartment is exhausted through the sunroof during the closing of the door,and as the opening of the sunroof increases,the pressure peak in the passenger compartment is smaller.Finally,based on the above research results,the control strategy of the pressure relief hole is proposed.Numerical simulations were carried out on the diameters of the relief holes of 50 mm,60mm,70 mm,80mm and 90 mm.The simulation results show that when the pressure relief hole diameter is 90 mm,the pressure relief hole can effectively take the passenger compartment during the door closing process.The pressure inside is reduced.Based on the simulation results,the corresponding pressure relief hole control method is proposed. |
