Vibration analysis and acoustic identification for a power-split planetary gear set

Vibration and acoustic characteristics of a new power-split hybrid transmission with a four-shaft planetary for passenger car are investigated in this research. A dynamic model with three degrees of freedom for the new compound planetary is established in pure electric driving mode. The numerical analysis for distinctive natural frequencies and corresponding vibration modes of this system are produced. Furthermore, in order to identify the noise source, acoustic and vibration experiments are carried out. Moreover, the finite element model for the shell cover is studied for verification of structure vibration resonant frequencies. It is demonstrated by comparison between numerical results and test data that the noise at frequency of 692 Hz is evidently related to the transverse vibration of motor E1 shaft, and the structure vibration of shell cover at frequency of 2930 Hz is exactly contributed to noise source at frequency near 3029 Hz.

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Vibration and acoustic investigation for a deep hybrid transmission with power-split compound planetary gear set

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406216639345 ◽

2016 ◽

Vol 230 (7-8) ◽

pp. 1331-1349 ◽

Cited By ~ 3

Author(s):

Liang Zou ◽

Jianwu Zhang ◽

Haisheng Yu

Keyword(s):

Degrees Of Freedom ◽

Planetary Gear ◽

Market Demand ◽

Noise And Vibration ◽

Driving Mode ◽

Electric Driving ◽

Power Split ◽

Rotational Vibration ◽

Hybrid Transmission ◽

The Impact

A new compound planetary gear set was produced for hybrid transmission with advantages superior to classical Ravigneaux planetary gears. However, vibration and noise problems need more attention in order to meet the market demand. Vibration characteristics of the new power-split hybrid transmission with a four-shaft compound planetary gear set are investigated. An equivalent method for stepped shaft is proposed to simplify the motor E1 shaft. Based on six degrees of freedom of helical gear pair model and shaft-bearing model, a dynamic model for the planetary mechanism is established in pure electric driving mode. The numerical analysis of the distinctive natural frequencies and corresponding vibration modes is produced. Moreover, in order to identify the noise source, noise and vibration experiments are carried out on test rig. By comparing the numerical results and test data, the noise and vibration at a frequency of 696 Hz are evidently caused by the transverse vibration of motor E1 shaft, and the rotational vibration of ring gear exacerbates the vibration and noise. Not only the impact of torques from motors E1, E2 and semi-shaft but also the influences of carrier speed and preload on differential bearings are investigated.

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Robust optimisation of dynamic and NVH characteristics for compound power-split hybrid transmission

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1177/1464419319856774 ◽

2019 ◽

Vol 233 (4) ◽

pp. 817-826

Author(s):

Han Guo ◽

Jianwu Zhang ◽

Haisheng Yu

Keyword(s):

Acoustic Radiation ◽

Radiation Power ◽

Numerical Procedure ◽

Planetary Gear ◽

Gear Train ◽

Optimal Control Strategy ◽

Numerical Predictions ◽

Power Split ◽

Hybrid Transmission ◽

Noise Vibration

In this paper, vibro-acoustic characteristics of a power-split hybrid transmission including a compound planetary gear set are investigated by numerical procedure and refined system dynamics modelling. For validation of the numerical predictions, bench tests are performed for dynamic and acoustic responses of the hybrid transmission, contribution rates of acoustic radiation power induced due to the planetary gears, support bearings, transmission shafts and the gearbox housing are estimated. In improving the noise, vibration and harshness (NVH) performance of the transmission during hybrid vehicle acceleration, traction torques of the motors against the planetary gear parametric resonance are formulated and an optimal control strategy is proposed. By real road NVH test results acquired on board of the midsize hybrid car, it is demonstrated that a significant reduction of the planetary gear whine noise is achieved. As a result, numerical approaches applied to establish relationships between torques of the two traction motors and parametric excitations of the compound planetary gear train are experimentally validated.

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Modeling and computer simulation of a novel hybrid transmission

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407018803010 ◽

2018 ◽

Vol 233 (10) ◽

pp. 2599-2609 ◽

Cited By ~ 1

Author(s):

Guan-Huei Wu ◽

Hong-Sen Yan

Keyword(s):

Computer Simulation ◽

Control Strategy ◽

Hybrid Electric Vehicle ◽

Planetary Gear ◽

Gear Train ◽

Planetary Gear Train ◽

Driving Mode ◽

Driving Cycles ◽

Equivalent Fuel ◽

Hybrid Transmission

This work presents the modeling and computer simulation of a novel hybrid transmission with a mechanical reverse driving mode, including an engine, a motor, a simple planetary gear train, and a Ravigneaux planetary gear train. Based on the given teeth number, the reduction ratios of all the clutching condition are acquired. The feasibilities of mode shifts among the clutching conditions are analyzed. Then, a modified rule-based control strategy is introduced. Subject to the vehicle condition, speed command, and predicted equivalent fuel consumptions, the most fuel economy clutching condition is selected by the control strategy. And, a computer model is developed using SIMULINK. Two popular driving cycles are applied to the simulation model, and the simulation results of the novel hybrid transmission are competitive with the existing hybrid electric vehicle models.

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A New Power Train for Electric Hybrid Vehicle

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.694-697.1587 ◽

2013 ◽

Vol 694-697 ◽

pp. 1587-1590 ◽

Cited By ~ 2

Author(s):

Zhen Lin Yang ◽

Ren Guang Wang ◽

Lin Tao Zhang ◽

Chao Yu ◽

Guang Kui Shi

Keyword(s):

Mode Selection ◽

Operation Mode ◽

Planetary Gear ◽

Hybrid Vehicle ◽

Selection Mechanism ◽

Power Train ◽

Driving Mode ◽

Vehicle Load ◽

Electric Driving ◽

Power Mode

A new kind of power train was developed for electric hybrid vehicle, which is mainly consisted of engine, two generator/motors, two sets of planetary gear, power mode selection mechanism. The power mode selection mechanism has three positions, it make the power train have three different operation modes which are pure electric driving mode, pure engine driving mode and hybrid driving mode. Different operation mode is corresponding to different vehicle load conditions for economy and dynamics requirements.

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Dynamic Characteristics of Double Helical Planetary Gear Train With Tooth Friction

Volume 10: ASME 2015 Power Transmission and Gearing Conference; 23rd Reliability, Stress Analysis, and Failure Prevention Conference ◽

10.1115/detc2015-48022 ◽

2015 ◽

Cited By ~ 1

Author(s):

Fengxia Lu ◽

Rupeng Zhu ◽

Haofei Wang ◽

Heyun Bao ◽

Miaomiao Li

Keyword(s):

Degrees Of Freedom ◽

Sliding Friction ◽

Planetary Gear ◽

Gear Train ◽

Variable Step Size ◽

Step Size ◽

Planetary Gear Train ◽

Gear Mesh ◽

Meshing Stiffness ◽

Nonlinear Dynamics Model

A new nonlinear dynamics model of the double helical planetary gear train with 44 degrees of freedom is developed, and the coupling effects of the sliding friction, time-varying meshing stiffness, gear backlashes, axial stagger as well as gear mesh errors, are taken into consideration. The solution of the differential governing equation of motion is solved by variable step-size Runge-Kutta numerical integration method. The influence of tooth friction on the periodic vibration and nonlinear vibration are investigated. The results show that tooth friction makes the system motion become stable by the effects of the periodic attractor under the specific meshing frequency and leads to the frequency delay for the bifurcation behavior and jump phenomenon in the system.

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Mechanical Structural Interference Detection for Dedicated Hybrid Transmissions

Journal of Mechanical Design ◽

10.1115/1.4050304 ◽

2021 ◽

Vol 143 (9) ◽

Author(s):

Hanqiao Sun ◽

Xiangyang Xu ◽

Yanfang Liu ◽

Peng Dong ◽

Shuhan Wang ◽

...

Keyword(s):

Graph Theory ◽

Graph Model ◽

Planetary Gear ◽

Modeling Method ◽

Structural Synthesis ◽

Original Graph ◽

Power Sources ◽

Detection Approach ◽

Hybrid Transmission ◽

Planetary Gear System

Abstract Planetary gear set (PGS) has been one of the best components to constitute a transmission configuration, including the dedicated hybrid transmission (DHT). Using different synthesis approaches, the DHT configurations can be obtained through algorithms. However, different synthesis results correspond to different connection states of the planetary gear system. There are a certain number of results that violate the motion requirements of the mechanical principal need to be detected and removed. Therefore, this paper presents a novel modeling method to systematically remove the interference structures, with graph theory in structural synthesis. Based on the original graph theory, this paper proposes an equivalent replacement modeling method to convert the motor graph model into a brake-like graph model. Based on the conversion, avoid the appearance of the hanging points in the graph model. By applying the proposed approach, a DHT structure proves the feasibility of the method. The proposed detection approach can systematically detect all the PGS-based transmission with multi-PGSs, multi-shifting elements, and multi-power sources.

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Free Vibration Analysis of Two-Stage Planetary Gear With Friction

ASME 2018 Noise Control and Acoustics Division Session presented at INTERNOISE 2018 ◽

10.1115/ncad2018-6133 ◽

2018 ◽

Author(s):

Wei Liu ◽

Yunbo Yuan ◽

Tao He ◽

Donghua Wang

Keyword(s):

Free Vibration ◽

Degrees Of Freedom ◽

Sliding Friction ◽

Free Vibration Analysis ◽

Planetary Gear ◽

Two Stage ◽

Second Stage ◽

Torsional Coupling ◽

Coupling Dynamic ◽

First Time

Considering the effect of teeth surface sliding friction, free vibration of two-stage planetary gears (TPG) is studied theoretically for the first time. The lateral-torsional coupling dynamic model and equation are established with three degrees of freedom: two translations and one rotation. The change rule of natural frequency is discussed with the case of first stage planetary gear’s number 4 and second stage planetary gear’s number 3, 4 and 5. Afterwards three vibration modes are summarized by calculating the free vibration. In order to understand the behavior of friction, the effect of friction on natural frequencies is analyzed for the case of considering friction and not considering friction. Furthermore, the ‘self-coupling’ phenomenon is obtained from the vibration of center component of TPG Meanwhile, the ‘mutual coupling’ is obtained between the first-stage planetary gear (FPG) and the second-stage planetary gear (SPG).

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Conceptual Design of Gear Differentials for Automotive Vehicles

Journal of Mechanical Design ◽

10.1115/1.2919415 ◽

1994 ◽

Vol 116 (2) ◽

pp. 565-570 ◽

Cited By ~ 16

Author(s):

Hong-Sen Yan ◽

Long-Chang Hsieh

Keyword(s):

Conceptual Design ◽

Degrees Of Freedom ◽

Planetary Gear ◽

Gear Train ◽

Design Constraints ◽

Two Degrees Of Freedom ◽

Design Concepts ◽

Planetary Gear Trains ◽

Gear Trains ◽

Gear Differential

An automotive gear differential is a joint-fractionated planetary gear train with two degrees-of-freedom. We summarize the characteristics of planetary gear trains and the design constraints of noncoupled automotive gear differentials to synthesize their corresponding kinematic graphs. Based on these graphs and the proposed respecializing process, we generate the atlas of design concepts for automotive gear differentials with any types of gear pairs. As a result, there are 4, 25, and 156 design concepts for five-, six-, and seven-bar automotive gear differentials, respectively.

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