Research On Lightweight Of Cryogenic Liquid Transport Semi Trailer Tank

Liquefied Liquefied natural gas is widely used in machinery manufacturing,medicine,metallurgy,chemical industry,aerospace and other industries.As one of the world’s three energy pillars,natural gas is an important force to achieve the "double carbon" goal and "beautiful China",and will play an important role in the global green and low-carbon energy transition.Cryogenic liquid carrier,as the main platform and tool of highway LNG transportation,acts as the link between the filling station and the large storage tank,and is an important carrier of LNG transportation.Up to now,the lightening of pressure vessel(cryogenic liquid transport truck tank)is still one of the current research focuses.In the design and manufacture of the traditional cryogenic liquid transport semi-trailer tank,the design and calculation are carried out according to the GB150 pressure vessel and other standard formulas,and the JB4732 analysis standard is checked.The lightweight calculation of tank body is not carried out according to the actual transport conditions of the tank car.Therefore,a boundary condition was proposed,which took TSG R0005 moving gauge,JB4732 analysis and design standard and the actual working condition as the boundary condition.Through the cross iteration variation of genetic algorithm,the optimization of lightweight calculation was studied.Then,the vibration frequency of lightweight calculation was compared with the experiment to verify.From the perspective of practical engineering application,the main research contents are as follows:Firstly,several main ways to realize the lightweight of pressure vessel at home and abroad are discussed.The research progress in light materials,light body structure,strain strengthening technology,selection of different design standards and reduction of safety factor are reviewed.Secondly,the general situation of cryogenic liquid transport semi-trailer is expounded.According to TSG R0005-2011 "Mobile Pressure Vessel Safety Technical Supervision Regulations",NB/T 47058-2017 "Frozen Liquefied Gas Vehicle Tank Truck" and other types of low-temperature liquid transport semi-trailer in the transport process of unstable transport loads(braking,starting,bumpy,etc.),The failure of the structure of the LNG transport tank car may be caused by various working conditions.The stress linearization results on each path of each part of the tank are studied.In this Thesis,quadratic regression fitting was carried out by orthogonal design combined with response surface method,and the lightweight mathematical model of the parameters and mass of the tank parts and the stress intensity of each path of the tank was fitted.The iterative solution was carried out by MOGA multi-objective genetic algorithm,and it was found that the mass of the tank was reduced by about 236.56 kg,and the thickness of the inner head was reduced by 1.50 mm.The width of the long side and short side of the inner container reinforcing ring are reduced by 4.66 mm and 6.40 mm,and the thickness is reduced by 0.55 mm,which is an innovation point of this thesis.Compared with the traditional optimization method,the reverse development takes the practical working conditions and industry standards as the benchmark,maximally obtains the optimal solution under the range of multi-parameter and multi-constraint conditions,and calculates the optimal matching of tank parts parameters under the specified conditions.In this Thesis,the accuracy of simulation is verified by comparing the CAE simulation calculation of the static strain analysis of the tank inertia impact force under the unstable transport load borne in the actual transport process with the experimental results of the driving regularity of the prototype vehicle of the same type on the platform,and the sixth order mode mode analysis of different vibration frequencies is carried out on the lightweight tank model.Combined with the influence of the dynamic analysis results of the vibration and strain signals of the tank car driving on the specific road surface,the road dynamic characteristic parameter test test is analyzed comprehensively.The results are consistent with the simulation results,and the expected goal is achieved.