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Title: Simulation
of distortion induced in assemblies by spot welding
Author(s): X Fan, I Masters, R Roy, D Williams
Source: Proceedings of the I MECH E Part B Journal of Engineering
Manufacture
Volume: 221 Page: 1317-1326. August 2007
DOI: 10.1243/09544054JEM782
Publisher: Professional Engineering Publishing
Abstract: Maintaining dimensional tolerances during the
manufacture of vehicle bodies is important to the automotive sector.
With the industry's drive towards continuous improvement there is
increasing focus on the effect of the joining process on the final
assembly. A simulation tool that can predict the distortion resulting
from assembly offers potential time- and cost-savings throughout
design and manufacture. Although individual spot welds have been
studied in detail, to-date methods to predict the distortion of
a final assembly have concentrated on the variation of the constituent
components. In the current paper simulation is used to predict the
distortion of an assembly owing to spot welding using a local/global
approach where the local distortion occurring around a single spot
weld is projected onto a global assembly at each of the weld locations.
The comparisons of the simulations of the assemblies with coordinate
measuring machine (CMM) data under different clamping conditions
suggest sufficient agreement with experimental data to be of value
to engineers. A number of possible enhancements are suggested to
improve the accuracy of final shape prediction.
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Title: Fault
detection in internal combustion engines using fuzzy logic
Author(s): M B Çelik, R Bayir
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 221 Page: 579-587. May 2007
DOI: 10.1243/09544070JAUTO366
Publisher: Professional Engineering Publishing
Abstract: In this study, a complementary fuzzy-logic-based
fault diagnosis system was developed to diagnose the faults of an
internal combustion engine (ICE) and the system incorporated with
an engine test stand. The input variables of the fuzzy logic classifier
were acquired via a data acquisition card and RS-232 port. The rule
base of this system was developed by considering the theoretical
knowledge, the expert knowledge, and the experiment results. The
accuracy of the fuzzy logic classifier was tested by experimental
studies which were performed under different fault conditions. Using
the developed fault diagnosis system, ten general faults which were
observed in the internal combustion engine were successfully diagnosed
in real time. With these characteristics, the system could easily
be used for fault diagnosis in test laboratories and in service
workshops.
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Title: Standard
multi-body system software in the vehicle development process
Author(s): E. Fischer
Source: Proceedings of the I MECH E Part K Journal
of Multi-Body Dynamics
Volume: 221, Number 1 / 2007 Pages 13-20
DOI: 10.1243/1464419JMBD59
Publisher: Professional Engineering Publishing
Abstract: In the developmental processes of a complex
product, such as a passenger car, simulation software tools are
used today to such an extent that the notion of a ‘virtual
development process’ is justified, paralleling the hardware-based
development process. In conjunction with several other software
tools, a multi-body software system (MBS) can be an integral part
of the virtual process, covering the area of suspension analysis
and vehicle dynamics, provided it is tailored to the specific needs
of the product, the software users, and the industrial organization.
This article describes these needs by showing the context in which
MBS is used, its interface with other tools, and the expectations
of the users and concludes with an assessment of the current state.
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Title: Modelling
and Control of An Electromechanical Steering System in Full Vehicle
Models
Author(s): Y Du, A Lion, P Maißer
Source: Proceedings of the I MECH E Part I Journal
of Systems and Control Engineering
Volume: 220 Page: 239-249. 2006
DOI: 10.1243/09596518JSCE96a
Publisher: Professional Engineering Publishing
Abstract: In the automotive industry, electrical
and electromechanical components and systems become more and more
important. In comparison with commonly used mechanical and hydraulic
systems they offer a large number of advantages with respect to
efficiency and flexibility, for example. Therefore, conventional
hydraulic steering systems are increasingly being replaced with
electromechanical ones. Currently, different concepts of electromechanical
steering systems are being developed. In this work an electromechanical
steering system with double pinions is modelled based on a uniform
theory for discrete electromechanical systems. This steering system
is implemented into a multi-body full vehicle model and a control
scheme has been developed. Subsequently, the performance of the
whole electromechanical system, and especially the behaviour of
the controller, has been tested with different handling manoeuvres.
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Title: Computer
simulation of piston-piston ring-cylinder liner coactions in combustion
engines
Author(s): A Kamierczak
Source: Proceedings of the I MECH E Part D Journal
of Automobile Engineering
Volume: 218 Page: 1491 - 1501. December 2004
DOI: 10.1243/0954407042707678
Publisher: Professional Engineering Publishing
Abstract: The aim of the numerical simulations
presented in this paper was the calculation of the loads of the
work process between elements of the ring seal components of the
diesel engine. In this engine a sealing piston ring with an antiwear
ceramic cover was developed. A computer simulation, which as model
loads uses program KIVA3 for combustion engine work process computations,
has been developed in this paper. This makes it possible to compute
the pressure and temperature distributions and the motion of the
charge in the combustion chamber at a particular point in the work
cycle. The computer models render the design material features of
the ring seal components. The models were discretized using EDS's
Unigraphix software (UG Scenario, see Appendix) and tetranodal,
tetrahedral elements. The piston ring coating (TiN-titanium nitride;
PAPVD method) was modelled using quadrilateral plane elements. For
the first time a coaction has been described between a ring seal
of changing properties of piston ring outside layers and other elements,
which is a unique achievement of the author. The finite element
method (FEM) analysis (MSC/NASTRAN was used as the solver in UG
Scenario, see Appendix) allowed us to calculate the distribution
of temperature range, heat flow, loads, reduced stresses, displacements,
and reaction forces in a ring with coating and cylinder liner in
the seal. Positive results of numerical calculation constitute the
basis for further research on a real object.
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Title: Finite element simulation of the tyre burst test
Author(s): E O Bolarinwa; O A Olatunbosun
Source: Proceedings of the I MECH E Part D Journal of Automobile Engineering
Volume: 218 Page: 1251 - 1258. November 2004
DOI: 10.1243/0954407042580075Title: A contact finite element algorithm for the multileaf spring of vehicle suspension systems
Author(s): Qing Li1; Wei Li2
Source: Proceedings of the I MECH E Part D Journal of Automobile Engineering Volume: 218 Page: 305 -- 314
DOI: 10.1243/095440704322955821
Publisher: Professional Engineering Publishing
Abstract: This paper presents an innovative finite element (FE) algorithm for the contact problem of the multileaf spring in vehicles. The well-established classic beam theory is adopted to construct the complementary strain energy variational. A piecewise contact stress pattern is approximated to the real contact state between two layered beams. The vector of nodal contact stresses is taken to represent primary state variables. To implement the principle of the least complementary energy, a quadratic programming (QP) problem with equality and unilateral constraints is formulated. The corresponding Kuhn-Tucker condition is equivalent to the linear complementary problem. In this study, Lemke's algorithm is applied to solve for the nodal stress vector and subsequently to determine the contact stress distribution over the contact surfaces between the layered beams. The algorithm is verified against experimental stress analysis, and it is found that the computation and test correlate well.
Publisher: Professional Engineering Publishing
Abstract: The use of predictive finite element (FE ) models in tyre design and analysis has become widely popular in recent times. This is largely due to the introduction of high-performance computers in addition to the enhancement in the capabilities of existing proprietary finite element software, thus enabling the efficient use of such tyre models in solving the challenging problems of pneumatic tyre behaviour as an alternative to experimental tests routinely carried out on tyre prototypes. This present work investigates tyre burst behaviour when the tyre is inflated well beyond the manufacturer's recommended maximum pressure. This will help to predict the extent to which a tyre can be loaded before failing catastrophically, thus simulating one of the mandatory tyre qualification tests. Consequently, an axisymmetric finite element tyre model has been developed using the improved capabilities in ABAQUS FE code, which allows the modelling of the tyre burst phenomenon, based on the ultimate strengths of the constituent reinforcement materials. A summary of the results obtained from this model for a passenger car tyre P195/65R15 H91 is presented together with a study of the effect of some tyre design parameters on the tyre burst pressure. Also some recommendations are made for enhancing the functionality of the model.
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Title: A contact finite element algorithm for the multileaf spring of vehicle suspension systems
Author(s): Qing Li; Wei Li
Source: Proceedings of the I MECH E Part D Journal of Automobile Engineering
Volume: 218 Page: 305 - 314. March 2004
DOI: 10.1243/095440704322955821
Publisher: Professional Engineering Publishing
Abstract: This paper presents an innovative finite element (FE) algorithm for the contact problem of the multileaf spring in vehicles. The well-established classic beam theory is adopted to construct the complementary strain energy variational. A piecewise contact stress pattern is approximated to the real contact state between two layered beams. The vector of nodal contact stresses is taken to represent primary state variables. To implement the principle of the least complementary energy, a quadratic programming (QP) problem with equality and unilateral constraints is formulated. The corresponding Kuhn-Tucker condition is equivalent to the linear complementary problem. In this study, Lemke's algorithm is applied to solve for the nodal stress vector and subsequently to determine the contact stress distribution over the contact surfaces between the layered beams. The algorithm is verified against experimental stress analysis, and it is found that the computation and test correlate well.
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