scholarly journals ROTATION JOINTS FRICTION IN A TRANSVERSAL MOBILE COUPLING

2021 ◽  
Vol 13 (3) ◽  
pp. 54-58
Author(s):  
Cornel Catalin Gavrila ◽  
◽  
Mihai Lates ◽  
Keyword(s):  
Friction Coefficient ◽  
Dynamic Behaviour ◽  
Important Influence ◽  
Final Part ◽  
Relative Movement ◽  
Torque Transmission ◽  
Transversal Plane ◽  
Parallel Axis

The transversal mobile couplings are used in movement and torque transmission between two main shafts having parallel axis, with the possibility to undertake misalignments in the transversal plane. These shaft misalignments are usually named transversal movements. The paper presents, starting from some kinematic aspects regarding relative movements between the coupling parts, the kinematic equations useful in determining position of the intermediary elements, depending by the transversal misalignments. Following this, using the inside relative movement in rotation joints between parts and corresponding adequate materials, the friction coefficient is studied. The friction which appears in coupling’s rotation joints between the involved parts has an important influence on their dynamic behaviour, wear and lifetime. The most significant friction and also wear is given by the alternant rotation movements in joints between parts, at the ends of their angular stroke. Due to this, the study of the friction between some materials to be used in coupling manufacturing is required, but also difficult because of some particularities, as reduced rotation in joints, for reduced transversal misalignments between the main shafts. There are presented, in the paper final part, the results and conclusions.

Design on Disc Cam Mechanism of Roller Follower

2010 ◽  
Vol 33 ◽  
pp. 631-635
Author(s):  
A.P. Hu ◽  
D.J. Kong ◽  
W. Zhu
Keyword(s):  
Friction Coefficient ◽  
Rolling Friction ◽  
Rolling Motion ◽  
Relative Movement ◽  
Cam Mechanism ◽  
Base Circle ◽  
The Common ◽  
Roller Radius ◽  
Rolling Friction Coefficient ◽  
Inappropriate Choice

The requirements on the movement law of the follower imposed by disc cam mechanism of roller follower are considered, and the influencing factors of the relative motion between the roller and the cam contour are investigated. The requirements on the roller radius for the rolling motion of the roller that is relative to the cam contour are analyzed. It can be found that the constant speed movement, one of the common follower motion laws, cannot be applied alone to roller follower disc cam mechanism; otherwise movement distortion for the follower will happen. The movement distortion caused by inappropriate choice of the movement law can not be avoided by increasing cam base circle radius or by decreasing roller radius. There is a required minimum roller radius for the relative movement between the roller and the cam contour to be rolling movement. The minimum radius is inversely proportional to the rolling friction coefficient between the roller and the cam contour, proportional to the radius of the friction circle of the revolute pair between the roller and the follower lever, and independent of the load of the cam mechanism, pressure angle and other dimension parameters.

scholarly journals Tire/wheel torsional dynamic behaviour and road friction coefficient estimation

2016 ◽  
Vol 18 (4) ◽  
pp. 2359-2371
Author(s):  
Xiao-bin Fan ◽  
Bing-xu Fan ◽  
Feng Wang ◽  
Qun-sheng Xia ◽  
Ping-an Wang
Keyword(s):  
Friction Coefficient ◽  
Dynamic Behaviour ◽  
Coefficient Estimation ◽  
Road Friction ◽  
Road Friction Coefficient

scholarly journals USING THE DISCRETE ELEMENT METHOD TO ANALYZE AND CALIBRATE A MODEL FOR THE INTERACTION BETWEEN A PLANTING DEVICE AND SOIL PARTICLES

2021 ◽  
pp. 413-424
Author(s):  
Fandi Zeng ◽  
Xuying Li ◽  
Yongzhi Zhang ◽  
Zhiwei Zhao ◽  
Cheng Cheng
Keyword(s):  
Friction Coefficient ◽  
Mass Flow ◽  
Dynamic Behaviour ◽  
Static Friction ◽  
Discrete Element ◽  
Soil Restoration ◽  
Contact Interface ◽  
Steel Rolling ◽  
Soil Particles ◽  
Static Friction Coefficient

Dynamic soil behaviour at the contact interface during transplanting makes it difficult to ensure transplanting quality. To solve this problem, the Hertz-Mindlin with bonding contact model was used to calibrate the parameters of soils in Inner Mongolia. Based on the response surface design principle, four-factor and three-level tests were performed using the repose angle as an evaluation index, and the following influence factors were considered: the soil-soil restoration coefficient, the soil-steel restoration coeficient, the soil-steel static friction coefficient and the soil-steel static friction coefficient. A regression model was analysed, and an optimization procedure yielded the following optimum combination of parameters: a soil-soil restoration coefficient of 0.45, a soil-steel restoration coefficient of 0.35, a soil-steel static friction coefficient of 0.85 and a soil-steel rolling friction coefficient of 0.13. This optimal combination was used to simulate the soil at the contact interface. The particle dynamic behaviour and soil particle mass flow were used to analyse the soil dynamic behaviour, showing that the average mass flow during the gradual opening of the duckbilled planter tends to increase over time; when the duckbilled planter gradually leaves soil, the contact interface of soil particles in the corner of the duckbilled planter unit causes a reduction in the fluctuation range of the soil mass flow, which exhibits a wave-like change. After the duckbilled planter has left soil, the contact interface of the soil changes tends to stabilize. The duckbilled planter-soil discrete element simulation model was verified. The results of this study provide a reference for the optimal design of a duckbilled planter structure.

scholarly journals Dynamic Properties and Wear Analysis of a Rail Vehicle with Wheels’ Self-Lubricating Coatings

2020 ◽  
Vol 23 (1) ◽  
pp. B22-B32
Author(s):  
Rafał Melnik ◽  
Andrzej Chudzikiewicz ◽  
Seweryn Koziak ◽  
Michał Opala ◽  
Ján Dižo
Keyword(s):  
Friction Coefficient ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Dynamic Properties ◽  
Railway Transport ◽  
Wheel Wear ◽  
Multibody Model ◽  
Rail Vehicle ◽  
Wear Analysis ◽  
Rail Wear

The problem of wheel and rail wear in railway transport generates costs of reprofiling and availability of vehicles and infrastructure. One of the possibilities of wear minimizing is decreasing of the friction coefficient in wheel-rail contact by means of lubricants. Such a solution has drawbacks from which the most crucial are: decrease of tractive/braking forces and difficulties with the precise spreading of the lubricant. These disadvantages may be avoided by modern, innovative self-lubricating coatings, applied at the production stage on the wheel flanges. The aim of the study is to investigate the effect of self-lubricating coatings on a rail vehicle's dynamic behaviour, safety against derailment and predicted wheel wear. The numerical study was performed using the wagon multibody model with simulated self-lubricating coating on wheel flanges.

Dynamic Behaviour of Rotary Vane Engines With One, Two and Four Work Units

Volume 2 ◽  
2004 ◽  
Author(s):  
B. V. Librovich ◽  
A. F. Nowakowski
Keyword(s):  
Mathematical Model ◽  
Simple Structure ◽  
Dynamic Behaviour ◽  
Geometrical Structure ◽  
Dynamical Behaviour ◽  
Reciprocating Engine ◽  
Torque Transmission ◽  
Work Units ◽  
Moving Parts

A mathematical model to analyse the dynamic behaviour of a novel rotary vane engine (RVE) is introduced in this paper. The RVE have a number of advantages compare to a majority of other reciprocating engine types. The main advantages are a simple structure and the small number of moving parts. The geometrical structure and dynamical behaviour of engines with a different number of work units is considered in detail. This has been examined through a study of torque transmission with a particular reference to how this is affected by the non-circular geometry of gear pitch curves. A possible method for balancing of asymmetric cogwheels have been proposed as well. The analysis concludes that by using an appropriate design and arrangement of cogwheels and all moving parts, vibration due to impulsive gas torque can be attenuated.

Investigation of fused silica dynamic behaviour

2006 ◽  
Vol 134 ◽  
pp. 929-934 ◽  
Author(s):  
F. Malaise ◽  
J.-M. Chevalier ◽  
I. Bertron ◽  
F. Malka
Keyword(s):  
Dynamic Behaviour ◽  
Fused Silica

A MODEL FOR THE FATIGUE SATURATION RANGE OF ALUMINIUM FROM DYNAMIC BEHAVIOUR AND INTERACTIONS OF DISLOCATIONS

1987 ◽  
Vol 48 (C8) ◽  
pp. C8-155-C8-160
Author(s):  
R. FOUGERES ◽  
J. CHICOIS ◽  
A. HAMEL ◽  
A. VINCENT
Keyword(s):  
Dynamic Behaviour

Analysis of the Multi-Channel Epileptiform EEG Using the Markov Chains Formalism

1989 ◽  
Vol 28 (03) ◽  
pp. 160-167 ◽  
Author(s):  
P. Penczek ◽  
W. Grochulski
Keyword(s):  
Dynamic Behaviour ◽  
Joint Probability ◽  
Drug Effects ◽  
Anticonvulsant Drug ◽  
Channel System ◽  
Markov Network ◽  
Eeg Data ◽  
Multi Level ◽  
Joint Probability Functions ◽  
Dependent State

Abstract:A multi-level scheme of syntactic reduction of the epileptiform EEG data is briefly discussed and the possibilities it opens up in describing the dynamic behaviour of a multi-channel system are indicated. A new algorithm for the inference of a Markov network from finite sets of sample symbol strings is introduced. Formulae for the time-dependent state occupation probabilities, as well as joint probability functions for pairs of channels, are given. An exemplary case of analysis in these terms, taken from an investigation of anticonvulsant drug effects on EEG seizure patterns, is presented.

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