Analysis of driveline loads in an automotive powertrain with multiple Cardan joints

2000 ◽  
Vol 214 (5) ◽  
pp. 509-522 ◽  
Author(s):  
V Krishna ◽  
N. G. Naganathan ◽  
R Phadnis ◽  
R. V. Dukkipati
Keyword(s):  
Time Domain Analysis ◽  
Angular Speed ◽  
Output Shaft ◽  
Equilibrium Analysis ◽  
Equilibrium Conditions ◽  
Angular Rotation ◽  
General Behaviour ◽  
Numerical Example ◽  
Contact Points ◽  
Automotive Powertrain

A general equilibrium analysis of automotive drivelines with multiple universal joints and numerous supporting conditions is presented. For the analysis, components of the driveline in terms of their angular rotation, angular velocity and acceleration are defined. Using kinematic conditions and a known torque and speed, the angular speed of the axle output shaft and all intermediate shafts and forces at contact points are computed using software developed to perform the analysis. To perform a time domain analysis, the quasi-static equilibrium conditions are imposed on the system at an instant. The instantaneous behaviour of the system is determined as a function of the transmission output shaft rotation. Finally, a numerical example is provided to illustrate the analysis. The results of the numerical example are plotted with respect to time. The general behaviour of the forces is found to be oscillatory and harmonic in nature.

Interaction of a Whirling Rotor with a Vibrating Stator across a Clearance Annulus

1968 ◽  
Vol 10 (1) ◽  
pp. 1-12 ◽  
Author(s):  
H. F. Black
Keyword(s):  
Dry Friction ◽  
Ball Bearing ◽  
Radial Symmetry ◽  
Experimental Results ◽  
Equilibrium Conditions ◽  
General Behaviour ◽  
Mass Unbalance ◽  
Jump Phenomena ◽  
Rotor Stator Interaction ◽  
Rotor Mass

Where a rotor runs within a clearance space, the clearance being comparable with rotor mass unbalance, the synchronous whirling behaviour of the rotor may be considerably affected by intermittent interaction with the stator at the clearance position. Discontinuity and jump phenomena may occur: in general, behaviour will be different with increasing speed from that with decreasing speed, and in either case zones may exist in which rotor-stator interaction is possible but not certain. In the analysis here presented, rotor and stator are regarded as linear multi-degree-of-freedom systems including damping; dry friction at the clearance space is taken into account. Discussion is limited to cases with radial symmetry, and interaction is assumed limited to the position of the clearance space. Polar receptances are used to establish equilibrium conditions with interaction, and speed zones are defined within which interaction may occur. Some hypothetical cases are fully explored, demonstrating that rotor-stator interactions may occur in a variety of forms and circumstances. Interactions with dry friction counterwhirling are also considered. Some experimental results on counterwhirl within a ball bearing are given and qualitatively compared with theory.

Time Domain Analysis on Ship Maneuvering in Adverse Sea State

2016 ◽  
Author(s):  
Bingjie Guo ◽  
Ruth Eivind ◽  
Håvard Austefjord ◽  
Elzbieta M. Bitner-Gregersen ◽  
Olav Rognebakke
Keyword(s):  
Time Domain ◽  
Ghg Emissions ◽  
Weather Conditions ◽  
Time Domain Analysis ◽  
Equilibrium Analysis ◽  
Future Research ◽  
Ship Maneuvering ◽  
Ship Maneuverability ◽  
Adverse Weather ◽  
The Time Domain

Energy Efficiency Design Index (EEDI) introduced by the IMO Resolution MEPC.203 (62) has been the first initiative to regulate the greenhouse gas (GHG) emissions from ships. However, it has raised serious concerns that some ship designers might choose to lower the installed power to achieve EEDI requirements not accounting satisfactorily for ship safety. This has encouraged investigations addressing the ability of ship to maintain maneuverability in adverse sea states. The Interim Guidelines proposed in 2013, in IMO Res. MEPC.232 (65), recommend minimum propulsion power to maintain ship maneuvering ability in adverse weather conditions for bulk carriers and tankers. These guidelines are mainly based on statistical analysis and equilibrium analysis in a steady state. Today, most of the available tools and methods handle ship responses in waves by separating it into seakeeping and maneuvering. The present study investigates ship maneuverability by use of a recently developed time domain code which combines the sea-keeping and maneuvering equation to predict ship responses in waves. In this way, better insight into ship responses in adverse conditions is obtained. The numerical results presented in the study are validated by model tests. The limitations of the time-domain code are discussed and future research needs are pointed out.

scholarly journals Cam based Infinitely Variable Transmission Theoretic Modelling

2022 ◽  
Vol 961 (1) ◽  
pp. 012091
Author(s):  
Muhaimen Faleh ◽  
Amjad Al-Hamood ◽  
Mahir H. Majeed
Keyword(s):  
Transmission Rate ◽  
Angular Speed ◽  
Output Shaft ◽  
Current Investigation ◽  
Discrete Variation ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Performance Research ◽  
Grooved Wheel ◽  
Theoretical Results

Abstract Infinitely variable transmission (IVT) is a system which delivers the ratio between two turning elements to a continuous (non-discrete) variation (including zero). This article uses Solidworks software to build and simulate a cam-based IVT system. There are two identical units in the system under examination. Each unit comprises a cam with an oscillating slot connection that swings on a hinge and can be vertically shifted by changing the transmission rate. This modifier can be a power screw or a hydraulic ram. In addition, a grooved wheel and followers or an actuator are included in the system units. The raised wheels swing rotating movement, such that they are coupled by a single-way clutch to the output shaft (ratchet) to move the output shaft one way. During the performance research, cam shapes are considered and examined inside the mechanism. a mixture of the unchanging speed and 1-5 polynomial shapes, used for the current investigation and tailored for The results produced from the simulation generally reveal the theoretical results expected in accordance with the layout of the current IVT system. For all parts in these units, the findings imply a uniform velocity while each unit is powered. In this investigation, nevertheless, the ratchets used cause remarkable fluctuations in the angular speed of the output axis. Further research is therefore urgently needed in the choice and investigation of more efficient ratchets.

Parameter Identification of a Grasp by a Planar Two-Fingered Robot Hand

1993 ◽  
Vol 5 (1) ◽  
pp. 12-18 ◽  
Author(s):  
Nobuharu Mimura ◽  
◽  
Yasuyuki Funahashi ◽  
Keyword(s):  
Parameter Identification ◽  
Robot Hand ◽  
Joint Angles ◽  
Unknown Parameters ◽  
Numerical Example ◽  
Contact Points ◽  
Unknown Object

Unknown forced and unknown contact points for the case in which a planar two-fingered robot hand achieves a stable grasp on an unknown object are identified in this paper. It is shown that the unknown parameters of the grasping system can be identified by detection of joint angles and torques while the object is manipulated slightly. Finally, it is illustrated by a numerical example that the algorithm of the grasp parameter identification is valid.

scholarly journals Mathematical modeling of mechanical properties of vibro-centrifuged fiber-reinforced concrete of variatropic structure

2021 ◽  
Vol 2131 (3) ◽  
pp. 032090
Author(s):  
E Shcherban’ ◽  
A Beskopylny ◽  
L Mailyan ◽  
S Stel’makh ◽  
D El’shaeva
Keyword(s):  
Reinforced Concrete ◽  
Technology Development ◽  
Technological Development ◽  
Experimental Studies ◽  
Angular Speed ◽  
Fiber Reinforced Concrete ◽  
Strength Characteristics ◽  
Design Parameters ◽  
Angular Rotation ◽  
Fiber Concrete

Abstract Today, one of the most relevant areas in the construction industry, linked to the requirements and provisions of the Strategy of Scientific and Technological Development, and in accordance with the priority areas of science and technology development, is the development and improvement of low-material, low-energy and low - resource-intensive technologies for the manufacture of concrete and reinforced concrete products and structures. In this regard, the technology of vibrocentrifugation, which allows to obtain concrete with an improved variatropic structure, is quite promising. In this work, the influence of the design parameters of the technological equipment and the parameters of the centrifugation modes on the integral strength characteristics of vibrocentrifugated fiber concrete was evaluated. In total, 13 samples of the annular section were manufactured and tested. Calculations of the integral strength characteristics of vibrocentrifugated fiber concrete depending on the height of the technological protrusions of the clamps and the angular rotation speed were performed by the method of orthogonal composite planning of the 2nd order using the MathCAD program. The mathematical method of planning the experiment is aimed at creating mathematical empirical models that determine the influence of the incoming variable factors on the strength characteristics. Thus, according to the results of experimental studies, the optimal height of the technological protrusions and the angular speed of rotation were determined. Thus, further regulation of technological factors in the manufacture of vibrocentrifugated products and structures will allow us to obtain the most effective ring-section structures with enhanced variatropy.

Synthesis of Planar Linkages That Contain Guiding Tracks

1987 ◽  
Vol 109 (2) ◽  
pp. 155-162
Author(s):  
Yesh P. Singh
Keyword(s):  
Complex Number ◽  
Parametric Form ◽  
Loop Closure ◽  
Numerical Example ◽  
Contact Points ◽  
Planar Linkages ◽  
Closure Method ◽  
Envelope Theory

In this paper synthesis procedures are developed for planar cam-link mechanisms for exact generation of arbitrary specified motion and arbitrary specified path with coordinated crank rotation specifications. Complex-number loop-closure method is used for determining the position of links and tracks. Equations of the tracks are derived in general and parametric form. Then the envelope theory is used for determining the follower contact points on the tracks. A numerical example, Table 1, is also presented for illustration.

A Computationally Efficient Algorithm for Simulating the Dynamic Train-Track Interaction

2020 ◽  
Author(s):  
Arya Datta ◽  
Dimitris Rizos ◽  
Yu Qian ◽  
Robert Mullen
Keyword(s):  
Contact Forces ◽  
Dynamic Force ◽  
Train Track ◽  
Computationally Efficient ◽  
Equilibrium Equations ◽  
Time Step ◽  
Equilibrium Conditions ◽  
Contact Points ◽  
Interface Contact ◽  
Force Equilibrium

Abstract A new method to determine the dynamic interaction between the train and track has been presented. The train and the track are considered as different subsystems. The subsystems are solved independently assuming no contact force exists, and the overall solution of the system is obtained enforcing displacement compatibility and dynamic force equilibrium equations. The proposed method solves the interface contact forces and the displacements of the contact points explicitly. The method proposed avoids iterative methods to enforce compatibility and equilibrium conditions as devised by other authors. The proposed method is also computationally efficient to the methods devised by different authors when the system is solved as one system since smaller systems are solved at a time and there is no need to update structural matrices at every time step. The numerical examples presented show the accuracy and efficiency of the proposed algorithm.

Flexible Manipulator Control Based on Inverse Dynamics Model and Joint Feedback

1996 ◽  
Vol 8 (3) ◽  
pp. 278-285
Author(s):  
Joško Petrić ◽  
◽  
Joško Deur
Keyword(s):  
Feedback Control ◽  
Inverse Dynamics ◽  
Feedforward Control ◽  
Angular Speed ◽  
Flexible Manipulator ◽  
Laboratory Model ◽  
Flexible Robot ◽  
Angular Rotation ◽  
Ac Motor ◽  
Manipulator Arm

In this paper a problem of precise positioning and precise trajectory tracking during fast motions of flexible manipulator's tip is solved by using feedforward and feedback control. Feedforward control acting is the inverse dynamics of the flexible robot, and feedback control acting is a function of the joint variables (angular rotation and angular speed). Inversion of linearized mathematical model of the manipulator dynamics is calculated in the frequency domain, using Fourier transformation. The research presented is theoretical and experimental. Experimental verification of developed control algorithm is performed on the self-made one axis laboratory model of the flexible manipulator arm driven by the permanent magnet AC motor.

scholarly journals Effect of the vertical relative motion of stock/switch rails on wheel–rail contact mechanics in switch panel of railway turnout

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401879065 ◽  
Author(s):  
Xiaochuan Ma ◽  
Ping Wang ◽  
Jingmang Xu ◽  
Rong Chen
Keyword(s):  
Contact Mechanics ◽  
Relative Motion ◽  
Contact Forces ◽  
Actual Contact ◽  
Numerical Example ◽  
Line Method ◽  
Contact Points ◽  
Trace Line ◽  
Railway Turnout

In order to enable the vehicle to change among the tracks, the stock and switch rails are separated and provided with different rail resilience levels on the baseplate in the railway turnout switch panel. Therefore, there will be vertical relative motion between stock/switch rails under wheel loads, and the relative motion will change the combined profile of stock/switch rails and consequently affect the wheel–rail contact mechanics. A method is developed in this article to investigate the effect of the relative motion of stock/switch rails on the wheel–rail contact mechanics along the railway turnout switch panel. First, the possible rigid wheel–rail contact points, called primary and secondary stock/switch rail contact points, are calculated based on the trace line method; second, the actual contact points are determined by the presented equations; finally, the distribution of wheel–rail contact forces on the stock/switch rails is obtained based on the continuity of interface displacements and forces. A numerical example is presented in order to investigate the effect of the relative motion of stock/switch rails on the wheel–rail contact points, stresses, and forces, and the results are presented and discussed.

scholarly journals ASPECTS OF FINANCIAL EQUILIBRIUM ANALYSIS AND ITS IMPLICATIONS IN MANAGEMENT DECISIONS

2013 ◽  
Author(s):  
Daniela Cristina Solomon ◽  
Iulia Andreea Bucur
Keyword(s):  
Financial Analysis ◽  
Balance Sheet ◽  
Equilibrium Analysis ◽  
Special Importance ◽  
Business Growth ◽  
Equilibrium Conditions ◽  
Financial Equilibrium ◽  
Scientific Analysis ◽  
Future Work ◽  
The Impact

Considering the impact of risk factors in the economic environment, this study provides to all users of financial information a possible pattern for analyzing the financial equilibrium, designed to clarify the importance of dynamic analysis of indicators characterizing the financial equilibrium of an enterprise, expressed on absolute values, especially for managers in decision-making on future work, aimed at achieving pre-established strategic and tactical objectives. Practice has shown that the management cannot be based on intuition and routine but on a scientific analysis, on a thorough knowledge of the existing situation, as well as on the identification of vulnerabilities and opportunities for development. In order to promote a rational policy concerning business growth and achieving economic and financial satisfactory results, the company’s management grants a special importance to the financial diagnosis. The support of financial analysis is the balance sheet that allows developing financial diagnosis on the financial equilibrium conditions and creditworthiness, objectives that allow the evaluation of the independence of the firm and its market value.

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