Research on the Design Method and Vibration Reduction Performance of Dual-Mass Flywheel

2019 ◽  
pp. 499-512
Author(s):  
Haipeng Luo ◽  
Guangquan Wu ◽  
Qi Wu ◽  
Wenfeng Zhan ◽  
Jiang Yang ◽  
...  
Keyword(s):  
Design Method ◽  
Vibration Reduction

An Experimental Study on Dynamic Properties of Rubber Specimens for a Crankshaft Torsional Vibration Damper of Automobiles

1999 ◽  
Author(s):  
Yasuhiro Honda ◽  
Katsuhiko Wakabayashi ◽  
Tomoaki Kodama ◽  
Hiroshi Okamura
Keyword(s):  
Torsional Vibration ◽  
Design Method ◽  
Dynamic Properties ◽  
Torsional Oscillation ◽  
Vibration Reduction ◽  
Exciting Frequency ◽  
Exciting Vibration ◽  
Damper Design ◽  
Vibration Tests ◽  
Rubber Damper

Abstract Torsional vibration occurs at a crankshaft system of operating multi-cylinder reciprocating engine in mechanism. A torsional vibration rubber damper is generally used to control or reduce the torsional vibration appearing at the crankshaft system of small diesel engine for automobile. Since automotive diesel engines have recently become engine weight lightening and higher performance output, both the amplitudes and the frequencies of the torsional vibrations generate increasingly more than before. Therefore, the torsional rubber damper should be required as one of the most important engine vibration reduction devices. The torsional vibration rubber damper must be precisely designed to match with a crankshaft system of engine with which it is mounted in order to reduce sufficiently. However, the prediction difficulty of its dynamic characteristics gives damper designers the design of a torsional rubber damper with variable experiments. While this design method requires too much time for examination of the vibration reduction effects obtained from some torsional oscillation tests, it is doubt whether the designed torsional damper will be able to sufficiently reduce the torsional vibration in variable engine operations. This paper refers to influences of rubber shape and forced frequency on properties of test rubber specimens designed for contribution to damper design. Furthermore, some important subjects on properties of rubber are described for design of shear-type torsional rubber dampers by using a rheological model. The rubber properties can be obtained from exciting vibration tests of rubber specimens with the changes of exciting frequency, amplitude and temperature. It is confirmed that the shape factor should be reduced to suppress the influence on rubber dynamic properties of external factors such as amplitude and frequency.

scholarly journals Vibration Antiresonance Design for a Spacecraft Multifunctional Structure

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Dong-Xu Li ◽  
Wang Liu ◽  
Dong Hao
Keyword(s):  
Design Method ◽  
Structural Parameters ◽  
Vibration Reduction ◽  
Zero Point ◽  
Thermal Control ◽  
Structural Vibration ◽  
Load Bearing ◽  
Structural Vibration Control ◽  
Complex Zero ◽  
Noise Vibration

Spacecraft must withstand rigorous mechanical environment experiences such as acceleration, noise, vibration, and shock during the process of launching, satellite-vehicle separation, and so on. In this paper, a new spacecraft multifunctional structure concept designed by us is introduced. The multifunctional structure has the functions of not only load bearing, but also vibration reduction, energy source, thermal control, and so on, and we adopt a series of viscoelastic parts as connections between substructures. Especially in this paper, a vibration antiresonance design method is proposed to realize the vibration reduction. The complex zero-point equations of the vibration system are firstly established, and then the vibration antiresonance design for the system is achieved. For solving the difficulties due to viscoelastic characteristics of the connecting parts, we present the determining formulas to obtain the structural parameters, so that the complex zero-point equations can be satisfied. Numerical simulation and ground experiment demonstrate the correctness and effectiveness of the proposed method. This method can solve the structural vibration control problem under the function constraints of load bearing and energy supplying and will expand the performance of spacecraft functional modules.

scholarly journals Design Method of Lightweight Metamaterials with Arbitrary Poisson’s Ratio

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1574 ◽  
Author(s):  
Haoxing Qin ◽  
Deqing Yang ◽  
Chenhui Ren
Keyword(s):  
Poisson’S Ratio ◽  
Optimization Problem ◽  
Design Method ◽  
Vibration Reduction ◽  
Functional Element ◽  
Deformation Resistance ◽  
Poisson's Ratio ◽  
The Novel ◽  
Stiffness Analysis ◽  
Absolute Value

A heuristic approach to design lightweight metamaterials with novel configurations and arbitrary Poisson’s ratio is studied by using the functional element topology optimization (FETO) method. Mathematical model of the optimization problem is established, where the minimization of the mass is set as the objective, then a series of metamaterials with Poisson’s ratio ranging from −1.0 to +1.0 are designed by solving this model. The deformation resistance and vibration reduction performance of the novel metamaterials and conventional honeycomb are compared by numerical simulations. Specific stiffness analysis shows that the novel metamaterials are 5.6 to 21.0 times more resistant to deformation than that of the honeycomb, and frequency response shows about 60% improvement in vibration reduction performance. Finally, the lightweight effects of the novel metamaterials on deformation resistance and vibration reduction performance are analyzed, and further analysis reflects that the lightweight effects increase with the increase of the absolute value of the Poisson’s ratio.

scholarly journals Study on Design and Vibration Reduction Optimization of High Starting Torque Induction Motor

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1263 ◽  
Author(s):  
Ying Xie ◽  
Cheng Pi ◽  
Zhiwei Li
Keyword(s):  
Induction Motor ◽  
Electromagnetic Force ◽  
Design Method ◽  
Vibration Reduction ◽  
Displacement Curve ◽  
Transient Dynamic Analysis ◽  
Vibration Displacement ◽  
Electromagnetic Vibration ◽  
Before And After ◽  
Starting Torque

Induction motors are widely used in various applications. This study considers a Y2-200L2-6 three-phase induction motor. Its starting torque was improved by combining the characteristics and design method of a star-delta hybrid connection winding, which can meet the demand of the motor for oil fields. Meanwhile the electromagnetic vibration and optimization of vibration reduction were studied based on the improved motor. The electromagnetic performance of the improved motor was calculated, and the electromagnetic force distribution of the motor was obtained based on the results of the transient magnetic field. Based on the calculation results of the electromagnetic force, a transient dynamic analysis of the motor was performed, and the electromagnetic vibration displacement curve of the motor was obtained. The experimental results of the vibration were compared with the finite element simulation results to verify the validity of the calculation method. The optimal design scheme of the stator winding was proposed based on the characteristics of the winding connection. The radial electromagnetic force and electromagnetic vibration displacement of the motor before and after winding optimization were compared, and the feasibility of the optimization scheme in reducing electromagnetic vibration was verified.

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