Theoretical analysis of the static forces and torque transmission by a class of spatial systems of rigid bodies for constant velocity transmission

1975 ◽  
Vol 2 (5-6) ◽  
pp. 249-254 ◽  
Author(s):  
N. Bellomo
Keyword(s):  
Theoretical Analysis ◽  
Constant Velocity ◽  
Rigid Bodies ◽  
Spatial Systems ◽  
Torque Transmission ◽  
Velocity Transmission

A Parameter Investigation Into the Thompson Constant-Velocity Coupling

2011 ◽  
Vol 133 (12) ◽  
Author(s):  
I. T. Watson ◽  
B. Gangadhara Prusty ◽  
J. Olsen ◽  
D. Farrell
Keyword(s):  
Design Optimization ◽  
Closed Form ◽  
Dynamic Model ◽  
Conceptual Design ◽  
Constant Velocity ◽  
Spherical Geometry ◽  
Technical Note ◽  
Intermediate Shaft ◽  
Torque Transmission ◽  
Dynamic Forces

The Thompson coupling is a relatively recent design of constant-velocity coupling, that is, principally based on the double Cardan mechanism. An extra mechanism comprising a spherical pantograph serves to align the intermediate shaft of this coupling and so maintains the constant velocity of the double Cardan mechanism, in a modular fashion. This technical note serves to introduce basic closed form expressions for the coupling’s geometry—which may then be used to derive linkage accelerations and dynamic forces. The expressions are derived using standard identities in spherical geometry. The resulting dynamic model then informs a basic conceptual design optimization, which object is intended to reduce induced driveline vibrations, when the coupling is articulated at nonzero angles of torque transmission.

Numerical Analysis of Impact Loads on Subsea Structures During Water Entry in Presence of Waves

2020 ◽  
Author(s):  
Gustavo Garcia Momm ◽  
Ivan Fábio Mota de Menezes
Keyword(s):  
Constant Velocity ◽  
Oil And Gas ◽  
Free Fall ◽  
Water Entry ◽  
Gas Production ◽  
Rigid Bodies ◽  
Bottom Surface ◽  
Impact Loads ◽  
Flat Bottom ◽  
The Impact

Abstract Subsea structures employed on offshore oil and gas production systems are likely to be subject to severe loads during deployment. Lowering these structures through the wave zone is a critical operation and the prediction of the loads associated is complex as it involves accelerations of these bodies induced by the vessel motion and the sea surface displacements. This work presents a numerical approach to assessment of the effect of waves on the impact loads that subsea structures are subject to during water entry. A 2D one degree of freedom model using the SPH method was developed to estimate slamming loads on rigid bodies during water entry considering both calm and wavy surfaces. Initially the model was employed to simulate the water entry of wedge considering both free fall and constant velocity cases, obtaining loads profile similar to experiments and numerical simulations from the literature. Later, the constant velocity model was configured to a flat bottom surface rigid body in order to represent a subsea manifold. A regular waves generator provided different wavelength, height and phase enabling slamming load assessment in various situations.

scholarly journals The assessment of the integration methods for the rail vehicle ride dynamics solution

2018 ◽  
Vol 157 ◽  
pp. 03013 ◽  
Author(s):  
Tomáš Lack ◽  
Juraj Gerlici
Keyword(s):  
Theoretical Analysis ◽  
Mechanical System ◽  
Dynamic Characteristics ◽  
Rigid Bodies ◽  
Similar Type ◽  
Integration Methods ◽  
Distributed Software ◽  
Rail Vehicle ◽  
Software Packages

The article is devoted to the analysis of the dynamic characteristics of the mechanical system composed of rigid bodies mutually connected with flexible bindings that represent springs and dampers. The analysed system represents the rail vehicle, which is distinguished by the contact link between the wheel and rail, or wheelsets and the track. Currently, analyses of similar type are carried out basically by using commercially distributed software packages, where you enter inputs (which the input forms allow) and the user may achieve results respecting the handling procedures. In accordance with the different approaches to solutions of partial solutions of the issue, the results of the simulations can differ. In the article the theoretical analysis is conducted the parameters of calculation are set out and the results are compared with the results obtained from the calculation by SIMPACK.

Design of Constant-Velocity Transmission Devices Using Parallel Kinematics Principle

2014 ◽  
Author(s):  
Jingjun Yu ◽  
Jiazhu Yu ◽  
Kang Wu ◽  
Xianwen Kong
Keyword(s):  
Constant Velocity ◽  
Parallel Mechanisms ◽  
Parallel Kinematics ◽  
Pure Rolling ◽  
Motion Range ◽  
New Type ◽  
Moving Coordinate ◽  
Instant Screw Axis ◽  
Velocity Transmission ◽  
Spherical Gear

This paper presents a new type of constant-velocity transmission devices based on parallel mechanisms with properties of equal-diameter spherical pure rolling. The method we used is essentially an extension of the planar ellipse gear to the spherical one. Both the fixed and moving axodes of a specified parallel mechanism are obtained, as traced by the spatial instant screw axis (ISA) with respect to the fixed and moving coordinate systems. Based on Poinsot’s theorem and achievements, a series of these parallel mechanisms which satisfy constant-velocity condition have been disclosed correspondingly. Their motion range and transmission performances are also explored by taking the 3-4R mechanism as an instance. As the main part of this paper, two important applications for this type of constant-velocity transmission devices are also explored. One is used as a gearless spherical gear, and the other is used as a constant-velocity universal joint (CVJ). Simulations were fulfilled on ADAMS to verify the transmission performance in terms of different applications.

Effect of the Deformation of the Supporting Structure on the Measurement of the Inertia Properties of Vehicles

2016 ◽  
Author(s):  
Giorgio Previati ◽  
Massimiliano Gobbi ◽  
Federico Ballo
Keyword(s):  
Mathematical Model ◽  
Theoretical Analysis ◽  
Rigid Bodies ◽  
The Body ◽  
Measuring System ◽  
Test Rig ◽  
Fem Model ◽  
Mathematical Procedure ◽  
Centre Of Gravity ◽  
Inertia Properties

In the measurement of the inertia properties of rigid bodies (mass, centre of gravity location and inertia tensor) the structures carrying the body under test are usually considered to be rigid. This assumption is less and less satisfied as the dimensions of the body grow. Consequently, the forces exchanged between the body and the structures can be large enough to deform the structure and affect the measurement, especially the location of the centre of gravity. In this paper, with special reference to the InTenso+ Measuring System of the Politecnico di Milano, the effects of the deformation of the test rig structure when measuring large bodies is investigated. A theoretical analysis is performed by using a flexible multibody mathematical model of the test rig. The deformation of the test rig is deeply investigated by a dedicated FEM model. The results of the theoretical analysis are then validated by measuring the inertia properties of a light truck. It turns out that the deformation of the test rig can actually affect the measurement. This deformation can be compensated by a proper mathematical procedure. The method can, consequently, be employed also for very large bodies for which the construction of a sufficiently rigid structure as to neglect its deformation is practically impossible.

Displacement Analysis of Spatial 7R Mechanisms Suitable for Constant-Velocity Transmission Between Parallel Shafts

1979 ◽  
Vol 101 (4) ◽  
pp. 604-613 ◽  
Author(s):  
M. J. Gilmartin ◽  
J. Duffy
Keyword(s):  
Constant Velocity ◽  
Velocity Ratio ◽  
Numerical Results ◽  
Theory Method ◽  
Unified Theory ◽  
Displacement Analysis ◽  
Loop Method ◽  
Joint Coupling ◽  
Velocity Transmission ◽  
Special Case

Three types of spatial 7R mechanisms are identified as being suitable for transmitting motion with a constant velocity ratio between two parallel shafts. A displacement analysis of each type is made using a vector loop method in conjunction with the Unified Theory method. Numerical results are presented for an example of each type. It is also shown how the double Hooke joint coupling for parallel shafts is a special case of one of these three types.

scholarly journals Numerical Analysis Based on a Multi-Body Simulation for a Plunging Type Constant Velocity Joint

2020 ◽  
Vol 10 (11) ◽  
pp. 3715
Author(s):  
Paul Marter ◽  
Christian Daniel ◽  
Fabian Duvigneau ◽  
Elmar Woschke
Keyword(s):  
Numerical Analysis ◽  
Simulation Model ◽  
Constant Velocity ◽  
Rigid Bodies ◽  
Operating Conditions ◽  
Hertzian Contact ◽  
Joint Analysis ◽  
Track Geometry ◽  
Frictional Forces ◽  
Multi Body

In early design phases of ball typed constant velocity joints (CVJ), which are widely used for the uniform transmission of rotational movement in driveshafts, the knowledge of the interactions between the components is essential. Therefore, a simulation model for a multi-body analysis is developed to consider general, transient operating conditions of the joint in the development process. The model is derived using the example of a plunging joint of the rear prop shaft, which has a straight track geometry and two track angles. On this basis, a two-dimensional, analytical contact determination between balls and tracks can be carried out, which reduces the required computation times compared to a general contact determination. Although rigid bodies are used for numerical analysis, local elastic deformations between the contact bodies are possible on the basis of Hertzian contact theory. For a higher level of detail, frictional forces are also taken into account via the Coulomb friction law, which is adapted for numerical use. To validate the simulation model, the influences of the numerical parameters are discussed and the numerical results are compared with the analytical results of the statically undeflected joint condition. Finally, the created simulation model is utilised to present the numerical joint analysis using two examples of joint kinematics analysis.

Sign in / Sign up

Export Citation Format

Share Document