Calculation and design of adaptive friction second-generation couplings (first version)

2020 ◽  
Author(s):  
M.P. Shishkarev ◽  
Keyword(s):  
Second Generation ◽  
Load Capacity ◽  
Control Device ◽  
Load Characteristic ◽  
Friction Clutch ◽  
Nominal Load ◽  
Clutch Control

The method of calculating an adaptive friction clutch with a separate power closure (the first option) is given.The features of calculating the values of the clutch control device parameters to ensure the highest accuracy of operation at a given nominal load capacity are shown. Explanations are given when calculating the values of the control device parameters depending on the shape of the load characteristic of the coupling.

DEVELOPMENT OF A METHOD FOR SELECTING THE SHAPE OF THE LOAD CHARACTERISTIC THE ADAPTIVE FRICTION CLUTCH WITH A SEPARATE POWER CIRCUIT

2020 ◽  
Author(s):  
D.A. Ramazanov ◽  
Keyword(s):  
Total Mass ◽  
Load Capacity ◽  
Power Circuit ◽  
Load Characteristic ◽  
Design Version ◽  
Friction Clutch ◽  
Load Characteristics ◽  
Nominal Load

The main provisions of the method for selecting the form of the load characteristic of the AFM with a separate power circuit are formulated. The method involves taking into account the nominal load, the total mass of the drive, the value of the gain of the adaptive friction clutch with a separate power circuit and the accuracy of its operation, as well as recommendations for the choice of the second design version of the clutch. The choice of the type of adaptive friction clutch, taking into account the load characteristics, is based on the different load capacity and accuracy of operation, which correspond to these forms.

PROTECTION EFFICIENCY OF PROCESS EQUIPMENT DRIVES ADAPTIVE FRICTION CLUTCHES

2020 ◽  
Author(s):  
M.D. Gavrilenko ◽  
Keyword(s):  
Load Capacity ◽  
Control Device ◽  
Operating Conditions ◽  
Process Equipment ◽  
Kinematic Scheme ◽  
Friction Materials ◽  
Protection Efficiency ◽  
High Coefficient ◽  
Machine Type ◽  
Friction Clutch

The authors show that the adaptive friction clutch, which is optimal for a particular drive depends on the type of technological machines, formulated in the process of calculation and design of drive requirements for the level of protection of its elements and components against overload, the degree of responsibility of the machine operating conditions of the clutch, the transmission and the whole machine, type, and Kinematic scheme of the drive, and the techno-economic requirements and drive the car. The accuracy of the selected type of clutch, set in its calculations and design, depends on the predicted dispersion of the friction coefficient during operation, the location of the clutch in the drive (if there are other conditions than minimizing the total weight, dimensions and cost of the drive) and the requirements for the overall dimensions, weight and cost of the drive. The use of new friction materials with a high coefficient of friction in adaptive friction clutches with combined, positive-negative and positive feedback, as well as in clutches with a bifunctional control device is optimal, which will significantly increase the rated load capacity of the clutches.

TECHNOLOGICAL APPLICATIONS OF ADAPTIVE FRICTION CLUTCHES

2020 ◽  
Author(s):  
N.V. Moiseeva ◽  
Keyword(s):  
Load Capacity ◽  
Kinematic Chain ◽  
Loading Capacity ◽  
Appropriate Use ◽  
Friction Clutch ◽  
Nominal Load ◽  
Executive Body

It is shown that the largest part of the existing adaptive friction clutches is suitable for use only in light and medium-loaded drives of machines, and their smallest part can be used in drives of machines operating at highly stabilized load on the Executive body. It is proven that short drives with a single-threaded kinematic chain it is advisable to use the adaptive friction clutch having relatively low accuracy and limited nominal loading capacity, in drives with long single-threaded kinematic chain, appropriate use of adaptive friction couplings with relatively low accuracy and with a higher nominal load capacity.

THE IMPLEMENTATION OF THE PRINCIPLE OF SEPARATION OF POWER CIRCUIT IN THE ADAPTIVE FRICTION CLUTCHES

2020 ◽  
Author(s):  
V. E Zinoviev ◽  
Keyword(s):  
Friction Coefficient ◽  
Feedback Gain ◽  
Power Circuit ◽  
Load Characteristic ◽  
The Third ◽  
Force Closure ◽  
Friction Clutch

For the third variant of the adaptive friction clutch with a separate force closure, the boundaries of the change in the value of the feedback gain are determined, within which the clutch has the highest accuracy of operation, if its load characteristic is realized in the form of a curve monotonically increasing in the range of the friction coefficient values. A variant of separate power closure is developed, which provides for the introduction of an additional spring into the clutch design in the closure node of the thorn pairs of the main friction group.

Paper 10: A Hydrodynamic Pocket Journal Bearing

1969 ◽  
Vol 184 (12) ◽  
pp. 70-74
Author(s):  
D. F. Sheldon ◽  
J. P. O'Donoghue ◽  
C. J. Hooke
Keyword(s):  
High Pressure ◽  
Journal Bearing ◽  
Load Capacity ◽  
Control Device ◽  
Experimental Results ◽  
Alternative Mode ◽  
Hydrostatic Bearing ◽  
Operating Range ◽  
Mode Of Operation ◽  
Return Valve

The authors present theoretical and experimental results for a hydrodynamic pocket bearing. The bearing has a geometry similar to that of a conventional hydrostatic bearing, but no control device is incorporated in the supply line other than a non-return valve which prevents the leakage of fluid from those pockets where a pressure is generated. The load capacity of such bearings is greater than that of a circumferentially grooved hydrostatic bearing over the operating range of eccentricity tested by the authors, and is much greater than that of two short hydrodynamic bearings equal to the side sealing lands. Because of this the bearing offers a useful alternative mode of operation for a bearing (externally pressurized) which suffers a loss of its high-pressure oil supply.

scholarly journals Feedback in Automated Clutch Control Circuit for Truck Start-Up Process

2018 ◽  
Vol 17 (5) ◽  
pp. 421-431 ◽  
Author(s):  
Le Van Nghia
Keyword(s):  
Control System ◽  
Power Unit ◽  
Intelligent Systems ◽  
Mechanical Transmission ◽  
Feedback Parameter ◽  
Start Up ◽  
Control Threshold ◽  
Friction Clutch ◽  
Multidisciplinary Model ◽  
Clutch Control

The paper presents description of a mechatronic control system for mechanical transmission of a 20-ton truck, as well as its adaptive start-up algorithm, transient process behavior which significantly affects durability of automated power unit elements, vehicle movement smoothness and driver’s comfort when driving. A multidisciplinary model of the mechatronic control system has been developed in the software package Imagine Lab AMESim because its power unit including a diesel engine, a dry frictional two-disc clutch, a main mechanical stepped gearbox and an additional gearbox has electrical components besides mechanical and pneumatic ones. The given model allows to test complex control algorithms and analyze the behavior of intelligent systems in the early designing stages. The research has been carried out on the basis of the test complex at Department “Automobiles”, Automotive and Tractor Faculty, Belarusian National Technical University. Research results confirm an adequacy of the AMESim developed multidisciplinary model. Feedback on the increment of an angular velocity difference between driving and driven parts of the friction clutch has been introduced for precise friction clutch control. Threshold values of a feedback parameter have been determined on the basis of the developed computer model and these values will be used for programming a microprocessor unit when implementing an adaptive algorithm for a truck start-up process

MODERNIZATION OF ADAPTIVE FRICTION CLUTCHES OF THE SECOND GENERATION

2020 ◽  
Author(s):  
V. E. Zinoviev ◽  
Keyword(s):  
Second Generation ◽  
Feedback Gain ◽  
Maximum Value ◽  
Friction Clutch

The possibility of implementing variants of adaptive friction clutch of the second generation with separate power closure of friction pairs of friction groups is shown. It is established that the choice of a variant of the circuit of separate power closure in the adaptive friction clutch of the second generation affects the limitation of the maximum value of the feedback gain.

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