Design And Research Of The H-Bahn Vehicle Bogie

H-bahn(hanging railway)refers to the suspended and unmanned mass transit monorail system stemmed from Germany with traits of light weight,middling speed,medium capacity,etc.The bogie of H-bahn vehicle,arranged in the box-type slotting track beam,takes the responsibility for driving,braking,guiding,damping,and hanging in the running process.In consideration of the technology import background in China,further researches on H-bahn vehicle bogie structure,operational mechanism and dynamics performance evaluation are required.On the basis of functional requirements of bogie and geometric construction of track beam,the bogie subsystems are designed explicitly.Through the statics and dynamics analysis on the foundation of vehicle structure,the stiffness-damping parameters of suspension systems are optimized to ameliorate the vehicle dynamics performance.Specific researches are implemented from the following several aspects.Initially,the detailed designing scheme is manifested explicitly about bogie frame,primary suspension system,secondary suspension system,trapezoidal hanging mechanism,motor mounting mode,etc.Furthermore,according to related theories involving Newton’s second law,law of fixed-axis rotation and particle motion in non-inertial system,the mathematical analysis models are established involving the statics,10-DOF(ten degrees of freedom)vertical dynamics,and lateral dynamics with transverse-rolling vibrations on the basis of structure geometric analysis.Additionally,through solving nonlinear equations of statics model,the parameters evaluating curve negotiation performance can be calculated,including vehicle body rolling angle,radical forces of guiding wheels,and load reduction rate of walking wheels.Then,the accelerations solved by the dynamics equations described by S-function require to be converted to Sperling index for evaluating running stability.Finally,after studying the impacts of stiffness-damping parameters of suspension system on vehicle running stability,the parameters are optimized to ensure the running stability index below 2.5.Meanwhile,the optimized parameters ensure vehicle with the minimum radial force exceeding zero and rolling angle under five degrees can satisfy the evaluation index of curve negotiation performance.Two innovation points can be refined in this thesis.From the system requirements of the structure design,the design of the lateral shock absorber in the secondary suspension system,cooling system of the electrical motor and controller,and vertical shock absorber and spiral spring in the primary suspension system can respectively improve the lateral running stability and heat dissipation potential,and reduce the space occupancy.From the theoretical point of view,the impact factors of the guiding wheels are analyzed through the aligning torque of air spring,cornering force of walking wheel,lateral force of vehicle body,and rolling moment of bogie.Simultaneously,the mathematical-mechanics analysis model of the radial force of the guide wheel is established.