Wear behavior of filled polymers for ultrasonic motor in vacuum environments

Shao

Duan

et al. 2018

In this article, the relationship of complexity, diversity, and uncertainty between components and tribological properties of friction materials based on a Monte Carlo-based artificial neural network (MC-ANN) model was predicted precisely. Meanwhile, the grey relational analysis was applied to figure out weight of factors, optimize formulation design, and calculate nonlinear dependency of ingredients. The accuracy of model was studied by comparing experimental and simulated values on the basis of statistical methods (root-mean-squared error). It was found that the model exhibited an excellent performance in predicting and fitting effect. Moreover, comprehensive analysis of weight indicated that nano-SiO 2 and mica exerted a significant role in improving the friction stability and wear resistance. According to different contents of each ingredient, the corresponding friction coefficient and specific wear rate could be obtained by virtue of a well-trained MC-ANN model without experiments, which saved a lot of time and money. It can be expected that the results of this work will extend the current research and pave a route for further in-depth studies of friction materials.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribological behavior prediction of friction materials for ultrasonic motors using Monte Carlo‐based artificial neural network

Shao

Duan

et al. 2018

“…The motors convert the ultrasonic vibration of the stator into the motion of the rotor, and the motors are characterized by self‐lock without power, high torque at low speed, fast response, etc. which have received enormous attention in applications of medical, automation, robotics, aerospace engineering, and various other fields . But at present, the USMs show poor performance in driving efficiency and service lifetime, which limit its applications.…”

Section: Introductionmentioning

confidence: 99%

“…But at present, the USMs show poor performance in driving efficiency and service lifetime, which limit its applications. Friction material, the heart of USMs, is one of the most important parts of USMs, which directly affects output characteristics and service lifetime of the motor . Thus it is especially important to have high antiwear property for the friction materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of fillers and counterface topography on wear behavior of PTFE polymers for ultrasonic motor

Wang

Zhang

et al. 2017

Aimed to study the effects of reinforcing or functional fillers on mechanical and tribological properties of PTFE-based friction materials of ultrasonic motor, carbon fibers reinforced PTFE composites modified with different functional fillers with differences in dimension, size, and hardness are fabricated. The tribological performances of PTFE-based friction materials are comparatively investigated under different sliding velocities and normal loads on different surface morphologies, respectively. The experimental results reveal that nano-SiO 2 shows excellent performance in improving friction stabilities and wear resistance in different operating conditions. It is believed the silica-based tribofilms, higher deformation resistance, and bearing capacity play a key role in improving friction stabilities. Furthermore, the results also show that the surface topography plays an important role in wear properties. The lower wear rate (sliding against with the disordered surface) is believed to be attributed to wear debris easy-store characteristic of the topography, which promotes transfer films formation and decreases the wear rate effectively. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44835.

Tribological performance of filled PTFE‐based friction material for ultrasonic motor under different temperature and vacuum degrees

Yang

Zhao

et al. 2017

In this work, a glass fiber reinforced polytetrafluoroethylene (PTFE)-based friction material with good properties for ultrasonic motor was fabricated. The effects of temperature and vacuum degree on the tribological behavior of the PTFE-based friction material were investigated; the evolutions of friction-wear modes and mechanisms were also discussed as function of temperature and vacuum degree. The results show that the delamination and fatigue wear are predominant under the effects of repeated shearing and dynamic contact under atmospheric environment. While wear mechanisms change from adhesive to abrasive and fatigue wear as it is cooled from 30 to 260 8C at vacuum environment. Under high vacuum, adhesive wear was prone to taking place at room temperature for high frictional heat which increased the wear rate and extended the running-in period. Experiment shows that the highest no-load speed, output power, and holding torque of ultrasonic motor at room temperature under atmospheric environment are 220 rpm, 9.9 W, and 1.21 N m, respectively.