scholarly journals Friction Coefficient Compensation Control in Synchronizer Synchronization Process for Transmission

2019 ◽  
Vol 9 (15) ◽  
pp. 3096 ◽  
Author(s):  
Hao Yan ◽  
Zhaoping Xu ◽  
Juntang Yuan ◽  
Meiyan Liu ◽  
Wenqing Ge
Keyword(s):  
Friction Coefficient ◽  
Sliding Friction ◽  
Control Method ◽  
Quantitative Relationship ◽  
Experimental Conditions ◽  
Synchronization Process ◽  
Shift Quality ◽  
Compensation Control ◽  
Simulation And Experiment ◽  
Synchronous Time

In the synchronization process of a synchronizer, the friction coefficient of the friction cone is changed because of friction heat. In this paper, the influence of a changing friction coefficient on shift quality was analyzed. The quantitative relationship between friction coefficient and its influencing factors was studied through a synchronizer synchronization process test bench. Based on the quantitative analysis and an optimal shift force control method, a compensation control strategy for friction coefficient was established. Moreover, the effectiveness of the compensation control was verified through simulation and experiment. The results showed that the friction coefficient was maintained near the expected value of 0.08 after the compensation control, the shifting speed difference the synchronous time was shortened by nearly 0.12 s, and the sliding friction was reduced by 4.64 J under the experimental conditions. The analysis and compensation of the friction coefficient provide a theoretical reference for improving shift quality.

scholarly journals Friction Characteristics of Synchronization Process Based on Tribo-Thermodynamics

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Hao Yan ◽  
Zhaoping Xu ◽  
Juntang Yuan ◽  
Liang Liu ◽  
Cao Tan ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Coupling Model ◽  
Maximum Temperature ◽  
Structural Coupling ◽  
Synchronization Process ◽  
Shift Quality ◽  
Compensation Control ◽  
Shift Control ◽  
Control Accuracy ◽  
Relevant Experiment

In order to improve the shift control accuracy and shift quality, the temperature and friction coefficient changing regularities of a friction cone during the synchronization process were investigated. The thermal-structural coupling model was established through tribo-thermodynamic analysis. The relevant experiment was carried out as well. The results show that the error between the experimental and simulated results is within 3%. Besides, the maximum temperature of the synchronous ring friction surface increases 1.8°C for every additional 50 N of shift force, while increases 1.1°C for every additional 200  r/min shift speed difference. Moreover, the friction coefficient declines rapidly first and then tends to be stable slowly during the synchronization process. The result of friction coefficient changing regularity lays a good theoretical basis for establishing an effective friction coefficient compensation control strategy.

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

Decoupling Control for Bearingless Synchronous Reluctance Motor Based on Neural Networks Inverse

2012 ◽  
Vol 150 ◽  
pp. 30-35
Author(s):  
Ze Bin Yang ◽  
Huang Qiu Zhu ◽  
Xiao Dong Sun ◽  
Tao Zhang
Keyword(s):  
Neural Networks ◽  
Control Method ◽  
Decoupling Control ◽  
Performance Simulation ◽  
Inverse Control ◽  
Linear Control Theory ◽  
Synchronous Reluctance Motor ◽  
Reluctance Motor ◽  
Static Performance ◽  
Simulation And Experiment

A novel decoupling control method based on neural networks inverse system is presented in this paper for a bearingless synchronous reluctance motor (BSRM) possessing the characteristics of multi-input-multi-output, nonlinearity, and strong coupling. The dynamic mathematical models are built, which are verified to be invertible. A controller based on neural network inverse is designed, which decouples the original nonlinear system to two linear position subsystems and an angular velocity subsystem. Furthermore, the linear control theory is applied to closed-loop synthesis to meet the desired performance. Simulation and experiment results show that the presented neural networks inverse control strategy can realize the dynamic decoupling of BSRM, and that the control system has fine dynamic and static performance.

scholarly journals Frictional properties of exhumed fault gouges in DFDP-1 cores, Alpine Fault, New Zealand

2021 ◽  
Author(s):  
Carolyn Boulton ◽  
D Moore ◽  
D Lockner ◽  
V Toy ◽  
John Townend ◽  
...  
Keyword(s):  
New Zealand ◽  
Friction Coefficient ◽  
White Mica ◽  
Rate Dependence ◽  
Experimental Conditions ◽  
Alpine Fault ◽  
Negative Rate ◽  
Sample Depth ◽  
Fault Gouges ◽  
Increasing Temperature

Principal slip zone gouges recovered during the Deep Fault Drilling Project (DFDP-1), Alpine Fault, New Zealand, were deformed in triaxial friction experiments at temperatures, T, of up to 350°C, effective normal stresses, σn′, of up to 156 MPa, and velocities between 0.01 and 3 μm/s. Chlorite/white mica-bearing DFDP-1A blue gouge, 90.62 m sample depth, is frictionally strong (friction coefficient, μ, 0.61-0.76) across all experimental conditions tested (T = 70-350°C, σn′ = 31.2-156 MPa); it undergoes a transition from positive to negative rate dependence as T increases past 210°C. The friction coefficient of smectite-bearing DFDP-1B brown gouge, 128.42 m sample depth, increases from 0.49 to 0.74 with increasing temperature and pressure (T = 70-210°C, σn′ = 31.2-93.6 MPa); the positive to negative rate dependence transition occurs as T increases past 140°C. These measurements indicate that, in the absence of elevated pore fluid pressures, DFDP-1 gouges are frictionally strong under conditions representative of the seismogenic crust.

Wave-Based Control of a Crane System With Complex Loads

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Jiao Zhou ◽  
Kai Zhang ◽  
Gengkai Hu
Keyword(s):  
Wave Scattering ◽  
Control Method ◽  
Model Simulation ◽  
Double Pendulum ◽  
Time Varying ◽  
Pendulum Model ◽  
Simulation And Experiment ◽  
Special Case ◽  
Transmission And Reflection ◽  
Load Mass

In the framework of wave-based method, we have examined swing motion control for double-pendulum and load-hoist models. Emphases are placed on wave scattering by the middle load mass in the double-pendulum model and on time-varying configuration in the load-hoist model. By analyzing wave transmission and reflection, trolley's motion to alleviate swing is designed by absorbing reflected wave through adjusting the velocity of trolley. Simulation and experiment are also conducted to validate the proposed control method. The results show that with the designed trolley's motion swings of load can be significantly reduced for both double-pendulum model, suspended rod model which is demonstrated a special case of double-pendulum model, and load-hoist model. Simulation results agree well with the experimental measurement. Launch velocity profiles may have important impact on motion design, especially on force necessary to displace trolley. Finally, a wave-based feedback control is also discussed to demonstrate the flexibility of method.

Vibration Control of Moving Flexible Structure by Repetitive Control

1995 ◽  
Author(s):  
Shinji Mitsuta ◽  
Hideki Tsuji ◽  
Hiroyuki Itoh ◽  
Yasushi Ogasawara ◽  
Kazuto Seto
Keyword(s):  
Feedback Control ◽  
Control Method ◽  
Repetitive Control ◽  
Model Identification ◽  
Step Response ◽  
Flexible Structure ◽  
Hydraulic Actuator ◽  
Residual Vibration ◽  
Vibration Displacement ◽  
Simulation And Experiment

Abstract The purpose of this study is to move a flexible structure, such as conveyance equipment that moves periodically, quickly and accurately by controlling its vibration. In order to reduce the vibration of a flexible structure actively, a hydraulic actuator is arranged on the motion transmission path between a drive system and a flexible structure. Generally, it is possible to obtain good effects for reducing a residual vibration by using feedback control. However, the vibration displacement in motion is mainly forced vibration which is caused by motion acceleration, so it is difficult to reduce the vibration displacement by using feedback control. Thus, by considering that the flexible structure is driven periodically, we use the repetitive control method to reduce the vibration displacement in motion. In this study, the repetitive control method with the step response, which does not need model identification, is shown. Furthermore, the validity of this method is examined by simulation and experiment.

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