Abstract:Theoretical modeling and experimental research are carried out on the dynamic torsional characteristics of a dual-mass flywheel (DMF) in this paper. Firstly, the structure and working principle of the DMF are analyzed. Secondly, the arc spring is analyzed by the discrete element method. For the different frictional torques in the working process, the linear fitting and equivalent energy methods are used to model the frictional torque under the dynamic condition of the arc spring. The fractional derivative mode… Show more
“…Mathematical analysis method has been widely employed in flywheel dynamic characteristics [10], flywheel energy capacity [11], flywheel rotor control [12], flywheel dynamic modeling [13], and other related topics [14], [15]. These studies demonstrate the credibility of the method to high-potentially predicts the real condition of an engineering problem related to the Automotive Experiences 48 flywheel as an energy storage system.…”
Section: Mathematical Description and Calculation Approachmentioning
The proper design of the flywheel undeniably determines in tuning the engine to confirm the better output engine performance. The aim of this study is to mathematically investigate the effect of various values of the compression ratio on some essential parameters to determine the appropriate value for the flywheel dimension. A numerical calculation approach was proposed to eventually determine the dimension of the engine flywheel on a five-cylinder four-stroke Spark Ignition (SI) engine. The various compression ratios of 8.5, 9, 9.5, 10, 10.5, and 11 were selected to perform the calculations. The effects of compression ratio on effective pressure, indicated mean effective pressure (IMEP), dynamic irregularity value of the crankshaft, and the diameter of the flywheel was clearly investigated. The study found that 2.5 increment value of the compression ratio significantly increases the effective pressure of about 41.53% on the starting of the expansion stroke. While at the end of the compression stroke, the rise of effective pressure is about 76.67%, and the changes in dynamic irregularity merely increase by about 1.79%. The same trend applies to the flywheel diameter and width, which increases 2.08% for both.
“…Mathematical analysis method has been widely employed in flywheel dynamic characteristics [10], flywheel energy capacity [11], flywheel rotor control [12], flywheel dynamic modeling [13], and other related topics [14], [15]. These studies demonstrate the credibility of the method to high-potentially predicts the real condition of an engineering problem related to the Automotive Experiences 48 flywheel as an energy storage system.…”
Section: Mathematical Description and Calculation Approachmentioning
The proper design of the flywheel undeniably determines in tuning the engine to confirm the better output engine performance. The aim of this study is to mathematically investigate the effect of various values of the compression ratio on some essential parameters to determine the appropriate value for the flywheel dimension. A numerical calculation approach was proposed to eventually determine the dimension of the engine flywheel on a five-cylinder four-stroke Spark Ignition (SI) engine. The various compression ratios of 8.5, 9, 9.5, 10, 10.5, and 11 were selected to perform the calculations. The effects of compression ratio on effective pressure, indicated mean effective pressure (IMEP), dynamic irregularity value of the crankshaft, and the diameter of the flywheel was clearly investigated. The study found that 2.5 increment value of the compression ratio significantly increases the effective pressure of about 41.53% on the starting of the expansion stroke. While at the end of the compression stroke, the rise of effective pressure is about 76.67%, and the changes in dynamic irregularity merely increase by about 1.79%. The same trend applies to the flywheel diameter and width, which increases 2.08% for both.
“…Furthermore, the NSGA-II algorithm was modified to allow its higher accuracy and efficiency in handling the multiobjective optimization problem for vehicle transmission systems. He et al [5] and Chen et al [6] developed a 19-DOF equivalent system model for a vehicle powertrain under driving conditions and experimentally verified the model validity. To avoid the excitation speed of engine torsional vibration, the model was simplified into a 6-DOF model with an engine, gearbox, transmission shaft, drive axle, wheel, and body.…”
A dual-mass flywheel is an important part of an automobile transmission system whose function is to ensure the smooth transmission of engine power to a gearbox. Vehicle vibration and noise are major indicators of vehicle comfort, while dual-mass flywheel technology can preferably solve the comfort problem. Based on the created torsional vibration model, this paper describes the testing of the torsional characteristics under various conditions with an LMS AMESim simulation. The results show that the noise in the cab is fundamentally below 60 dB. The computational formula for the angular stiffness of an arc coil spring is derived, and then the spring angular stiffness is optimized with arithmetic averaging, which reveals an adjusted angular stiffness of 12.8 Nm/°. Additionally, the requirement for the angular acceleration of the WOT input shaft (i.e., being less than 500 rad/s2) is satisfied for various gears. The test results show that the double-mass flywheel can attain a vibration isolation efficiency of around 85%, which more effectively reduces the transmission vibration and noise and improves the vehicle comfort.
“…The first mass assembly is connected to the second mass assembly by low rigidity arc spring and can rotate relative to each other. When the crankshaft of the engine is rotated, the first mass is driven to compress the arc spring through the boss, and the other end of the arc spring pushes the side ears on both sides of the force transfer flange, to drive the second mass to rotate and realize the powertrain of power from the engine to the gearbox (Chen et al, 2019; Zu et al, 2015). Figure 1.Structure of dual mass flywheel (a) schematic diagram of parts of dual mass flywheel, (b) two-stage stiffness arc spring structure, and (c) angular clearance diagram.…”
Section: Structure Principle Of Dmfmentioning
confidence: 99%
“…At present, the research of DMF mainly focuses on dynamic modeling (Chen et al, 2019; Kim et al, 2006; Schaper et al, 2009; Szpica, 2018), parameter matching (He et al, 2019; Wang et al, 2016), and structure improvement (Song et al, 2014; Zeng et al, 2015; Zu et al, 2015). However, there are many nonlinear factors in DMF.…”
The influence of nonlinear factors on the dynamic behavior of the powertrain torsional damper is studied by using the average method. First, the structure and working principle of dual mass flywheel are analyzed, and the nonlinear dynamic model of dual mass flywheel is established. Then the frequency response curve is obtained by the average method, and the accuracy of the solution is verified by the RK4 method. Finally, the effect of the parameters of dual mass flywheel on the amplitude–frequency characteristics is studied. The results show that the average method is suitable for the nonlinear vibration analysis of the dual mass flywheel, and the amplitude–frequency characteristic curve of the system has the characteristics of turning to the high frequency at the segment. Reducing the excitation amplitude, increasing the viscous damping, or increasing the Coulomb friction damping can effectively reduce the resonance peak value of the dual mass flywheel, and increasing the angular clearance is beneficial to further reduce the resonance frequency of the dual mass flywheel.
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