SIMULATION OF A DUAL CLUTCH AUTOMATED TRANSMISSION GEAR SHIFT

2021 ◽  
Vol 2021 (3-4) ◽  
pp. 14-24
Author(s):  
Aleksandr Reutov
Keyword(s):  
Software Package ◽  
Friction Forces ◽  
Frictional Energy ◽  
Input Shaft ◽  
Maximum Value ◽  
Vehicle Motion ◽  
Dry Clutch ◽  
Engine Crankshaft ◽  
Universal Mechanism ◽  
Transmission Gear

A computer dynamic model of an automobile transmission with a double dry clutch, created using the "Universal Mechanism" software package, is presented. Work objective is to analyze the possibility of improving double dry clutch efficiency at various controls of compressive forces of clutch plates. The computer model contains 7 bodies: an engine crankshaft, two clutch plates, two gearbox input shafts for odd and even gears, an output shaft, a fly wheel. The simulation of gear shifting shows that pressing a clutch pedal or letting out the clutch simultaneously, cutoff time increment increases the rotational speed justification of the engine shaft and the input shaft of the actual gear, the total work of the friction forces of both clutches and does not affect the maximum value of clutch plates rotary sliding resistance. Frictional energy of the clutch when shifting gears from lower to higher is greater than when shifting gears from higher to lower. Sequential clutch on-off reduces the total frictional energy of both clutches by 1.17...1.31 times compared to simultaneous one. The model allows looking into different gearshift modes with uniform velocity or accelerated vehicle motion, optimize the gearshift strategy.

Impact of lubrication on the safety of cargo traffi c

Innotrans ◽  
2020 ◽  
pp. 43-45
Author(s):  
Inna L. Parahnenko ◽  
Keyword(s):  
Traffic Safety ◽  
Software Package ◽  
Classical Method ◽  
Side Surface ◽  
Transverse Force ◽  
Rolling Stock ◽  
Small Radius ◽  
Vertical Load ◽  
Curved Section ◽  
Universal Mechanism

The wear hardness of the wheel in the gauge when passing curved sections of the track is a primary factor for traffic safety. This parameter is determined by the ratio of the transverse force that increases when the crew passes the curved section to the dynamic vertical load from the rolling stock on the rail. Using mathematical modeling in the software package «Universal mechanism», it is proved that the use of lubrication on the tracks of both track rails reduces the longitudinal forces by up to 60% in curves of small radius and up to 30% at radius up to 1000 m. It is possible to reduce the transverse forces by at least 15% by applying a lubricant to the track of the inner track rails [1, 2]. The use of the classical method (lubrication of the side surface of the outer rail) did not reveal a significant reduction of the forces.

scholarly journals Designing a Tracked Running Gear of a Radio-Controlled Harvester

2020 ◽  
Vol 329 ◽  
pp. 05001
Author(s):  
Vladislav Klubnichkin ◽  
Evgeny Klubnichkin ◽  
Maxim Yakovlev ◽  
Vladimir Makarov ◽  
Vladimir Belyakov
Keyword(s):  
Software Package ◽  
Variable Parameters ◽  
Tracked Vehicles ◽  
Tractive Effort ◽  
Applied Software ◽  
Basic Characteristics ◽  
Universal Mechanism ◽  
Selection Of

This work describes a model of a running gear of the designed tracked radio-controlled harvester intended for clean cutting which has been developed in the applied software package “Universal Mechanism” with use of the “Tracked Vehicles” module. It offers basic characteristics, justifies selection of variable parameters of the model. It describes modelling options of a model travel over variable irregularities, presents the obtained tractive effort torques on sprockets and loads acting on the support rollers.

scholarly journals Features of the influence of intermediate rail fastenings on the operational durability of rails

2021 ◽  
Vol 80 (4) ◽  
pp. 201-208
Author(s):  
N. V. Kuznetsova ◽  
E. A. Sidorova
Keyword(s):  
Fatigue Damage ◽  
Software Package ◽  
Main Type ◽  
Contact Fatigue ◽  
Railway Network ◽  
Bench Tests ◽  
Study Results ◽  
Calculation Results ◽  
Current Content ◽  
Universal Mechanism

Heat-strengthened rails of the R65 type are the main type of rails used on the railway network of Russian Railways. Reducing the number of cropped and acutely defective rails is possible due to the rational use of the design features of intermediate rail fasteners and their current content.The article presents study results of the stiffness influence of intermediate fasteners on the operational durability of rails. The general statistics of the use of various types of intermediate rail fastenings on the network of Russian railways is considered. The main results of previously published studies on the effect of the stiffness of intermediate rail fasteners on the accumulation of contact fatigue damage in rails are briefly presented.Calculations of the accumulation of contact-fatigue damages in rails, carried out by the authors, are based on the data on the vertical and horizontal transverse stiffness of intermediate rail fastenings obtained from the results of bench tests. Calculations of the accumulation of contact-fatigue damage were carried out using the “Universal Mechanism” software package. In the process of modeling, four types of intermediate rail fasteners were considered: ARS-4, ZhBR-65Sh, ZhBR-65PShM and W-30. Calculation results were obtained for a curve with a radius of 650 m on a continuous welded track section.

Assessment of the wear of wheels of freight cars under the existing standards for releasing three-piece bogies with an axle load of 23,5 tf from repair

2021 ◽  
Vol 18 (1) ◽  
pp. 52-61
Author(s):  
A. V. Saidova ◽  
◽  
V. I. Fedorova ◽  
Yu. B. Zhitkov ◽  
I. V. Fedorov ◽  
...  
Keyword(s):  
Computer Modeling ◽  
Software Package ◽  
Practical Importance ◽  
Optimal Parameters ◽  
Wheel Wear ◽  
Rail System ◽  
Freight Car ◽  
Universal Mechanism

Objective: To assess the effect of the dimensions and tolerances of three-piece bogies of freight cars with a maximum static axle load of 23,5 tf when they are released from scheduled repair on the wheel flange wear in operation. Methods: For this purpose, drawing on a review and analysis of the literature in the field of wheel-rail system wear and the current requirements of guidelines for the repair of freight cars and their parts, design cases were formed to simulate a railway crew movement along a track of various designs with operating speeds, and the processes of wheel flange wear were studied using simulation computer modeling in the environment of the “Universal Mechanism” software package. Results: The parameters of freight car bogies which have the greatest impact on wheel wear have been determined. The quantitative values of the indicators of wheel wear for various cases of crew movement have been determined. The ways of reducing the wear of car wheels in operation by changing the dimensions and tolerances of bogies when they are released from scheduled types of repair are shown. Practical importance: The obtained results of the work commissioned by JSC “First Freight Company”are currently used to formulate requirements for the dimensions and tolerances of bogies when they are released from repair in order to establish the optimal parameters that would help to reduce the wheel flange wear in operation. In addition, they can be used in the developing new designs of freight car bogies.

Nonlinear Stability Analysis of Vehicle Lateral Motion With a Hybrid Physical/Dynamic Tire/Road Friction Model

2009 ◽  
Author(s):  
Jingang Yi ◽  
Eric H. Tseng
Keyword(s):  
Friction Model ◽  
Lateral Motion ◽  
Nonlinear Stability Analysis ◽  
Friction Forces ◽  
Motion Stability ◽  
Road Friction ◽  
Vehicle Motion ◽  
Longitudinal Slip ◽  
Estimation And Control ◽  
And Control

We present a nonlinear analysis of vehicle motion using a hybrid physical/dynamic tire/road friction model. The advantage of the proposed LuGre dynamic tire/road friction model is the simple and attractive structural properties for real-time friction estimation and control. Moreover, the model provides a property of capturing coupling effects between the longitudinal and lateral friction forces. We take advantages of these properties and analyze the vehicle lateral motion stability. We have shown that the existence of longitudinal slip affects the lateral motion stability. The quantitative analysis and relationship are also demonstrated through numerical simulation examples.

Simulation Analysis on Hobbing Process and Heat Treatment of Automotive Transmission Gear Based on the MASTA Software

2014 ◽  
Vol 1037 ◽  
pp. 66-70
Author(s):  
Hui Mei Liu ◽  
Li Li Wan ◽  
Xiao Hong Zhang
Keyword(s):  
Heat Treatment ◽  
Thermal Deformation ◽  
Simulation Analysis ◽  
Cylindrical Gear ◽  
Software Simulation ◽  
Process Characteristics ◽  
Automotive Transmission ◽  
Maximum Value ◽  
Gear Manufacturing ◽  
Transmission Gear

Based on the MASTA cylindrical gear manufacturing module, the hobbing process and heat treatment of automotive transmission gear were simulated. The simulation results show that the hobbing process has a lot of excellent process characteristics, such as good adaptability, continuous cutting, no extra stroke, higher productivity. By the MASTA software simulation the maximum value of the gear heat treatment deformation is about 70 um. The trend of thermal deformation first increases, then decreases, and then increases.

The Torque on the Input Shaft of an Axial-Piston Swash-Plate Type Hydrostatic Pump

1998 ◽  
Vol 120 (1) ◽  
pp. 57-62 ◽  
Author(s):  
N. D. Manring
Keyword(s):  
Traditional Method ◽  
Traditional Approach ◽  
Time Varying ◽  
Resonant Frequencies ◽  
Input Shaft ◽  
Maximum Value ◽  
Swash Plate ◽  
Axial Piston ◽  
Integral Average ◽  
Plate Type

Traditionally, the theoretical torque on the input shaft of a hydrostatic pump has been determined using a macroscopic “power-in, power-out” approach that neglects the time-varying aspects of this quantity and the compressibility of the hydraulic fluid within the circuit. In contrast to the traditional approach, this research analyzes and sums the basic forces within the machine to compute the instantaneous torque exerted on the shaft. It is shown that the instantaneous torque repeatedly varies by 1.5 percent of its maximum value and that resonant frequencies of the pump occur at even multiples of the “piston-pass” frequency. Furthermore, an integral average of the instantaneous torque is performed and shown to deviate by a maximum of 3 percent from the traditional method of computing this quantity.

Application of a Mechanical Filter to an Artificial Heart

1996 ◽  
Vol 118 (2) ◽  
pp. 187-192
Author(s):  
M. Arabia ◽  
F. Pistella
Keyword(s):  
Resonant Frequency ◽  
Artificial Heart ◽  
Mechanical Load ◽  
Reciprocating Motion ◽  
Friction Forces ◽  
Maximum Value ◽  
Mechanical Filter ◽  
Inertial Component ◽  
Order Of Magnitude

A mechanical filter developed to improve the performances of an artificial heart whose electrical motor has a reciprocating motion is presented. The filter phases the mechanical load strongly reducing its inertial component (which is of the same order of magnitude as the useful load). The analysis reported for a prototype developed by us shows that when its rate is equal to the first resonant frequency of the filter, a reduction of about 50 percent for the maximum value of the torque due to inertial and friction forces is obtained.

scholarly journals Experimental Characterization of the Coupling Stage of a Two-Stage Planetary Gearbox in Variable Operational Conditions

Machines ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 45 ◽  
Author(s):  
Claudia Aide González-Cruz ◽  
Marco Ceccarelli
Keyword(s):  
Internal Friction ◽  
Experimental Characterization ◽  
Two Stage ◽  
Friction Forces ◽  
Operational Conditions ◽  
Planetary Gearbox ◽  
Input Shaft ◽  
University Of Rome ◽  
The University

This paper presents an experimental characterization of a two-stage planetary gearbox (TSPG) designed at the Laboratory of Robot Mechatronics (LARM2) in the University of Rome Tor Vergata. The TSPG operates differentially as function of the attached load and the internal friction forces caused for the contact between gears. Experiments under varying load conditions are developed in order to analyze the usefulness of the gearbox to avoid excessive torques on its internal elements. The analysis of the dynamic torques is presented as an indicator of stability in the gearbox operation. The results show that the actuation of the second operation stage reduces the torques 57% in the output shaft and 65% in the input shaft. The efficiency of the gearbox is estimated as 40% in presence of high internal friction forces.

scholarly journals Automotive dry clutch fully coupled transient tribodynamics

2021 ◽  
Author(s):  
I. Minas ◽  
N. Morris ◽  
S. Theodossiades ◽  
M. O’Mahony ◽  
J. Voveris
Keyword(s):  
Transient Dynamics ◽  
Dynamics Model ◽  
Input Shaft ◽  
Frictional Properties ◽  
Clutch System ◽  
Numerical Tool ◽  
Dry Clutch ◽  
Noise Vibration ◽  
The Stability ◽  
Fully Coupled

AbstractDetermining the root causes of Noise, Vibration and Harshness (NVH) phenomena in modern automotive drivetrains is a task of critical importance. This research investigates the stability of dry clutch systems vibrational behaviour during engagement. A fully coupled dry clutch numerical model including the influence of friction is presented and validated using vehicle measurements. The clutch component frictional properties are measured using parts that exhibit aggressive NVH behaviour using representative tribometric experiments. The validated numerical tool highlights the occurrence of instabilities which are caused by modal couplings, particularly between the input shaft bending and clutch disc radial motions. Such a validated transient dynamics model of a dry clutch system has not hitherto been presented in the open literature.

Sign in / Sign up

Export Citation Format

Share Document