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Das exzentrische schubkurbelgetriebe eine analytische betrachtung ...Schreiter, Karl Otto, January 1914 (has links)
Inaug.-diss.--Rostock. / Lebenslauf.
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Das exzentrische schubkurbelgetriebe eine analytische betrachtung ...Schreiter, Karl Otto, January 1914 (has links)
Inaug.-diss.--Rostock. / Lebenslauf.
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Behavior of a cracked shaft during passage through a critical speed /Andruet, Raul Horacio, January 1991 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 143-145). Also available via the Internet.
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The development of a process for the radius hardening of diesel engine crankshaft journalsKlos, Gerhard P. J. January 1992 (has links)
Thesis (M. Diploma (Mechanical Engineering))--Cape Technikon, 1992. / Radius hardening on journals of forged steel Diesel
engine crankshafts is performed in order to increase
fatigue life characteristics. This requirement may
be necessary if the demands for engine power are to
be increased, but where the existing crankshaft
design is close to its fatigue limit, such that an
increase in loading will cause it to'fail.
Induction hardening of journal radii changes the
make-up of the material from a coarse to a fine
crystalline structure which alters the features of
crack propagation. As a consequence of this higher
loads can be applied onto the crankshaft without
ultimately resulting in catastrophic material
failure. Extending the induction hardened zone from
the bearing surfaces into the radii of journals,
culminates in process difficulties which are not
experienced in non-radius hardened
Hardening of journal radii induces
crankshafts.
as well as
releases stresses in the crankshaft webs. This
results in a deformation of the crankshaft which can
be measured in the form of journal runout. Such a
problem cannot be overcome by straightening the
crankshafts in order to reduce runout, since this
will cause
Straightening
hand induces
the radii to crack once hardened.
in the unhardened state on the other
stresses which will be released again
after hardening. This results in an increase in
runout. High runout indicates that stresses have
been induced into the crankshaft material. This is
undesirable since this will make critical
manufacturing processes such as grinding, governing
of journal lengths, uncontrollable. It can furthermore
result in creep of the crankshaft long
after the manufacturing date. This results in
crankshaft deformation, noticeable through an
increase in runout. Since the crankshaft cannot be
straightened after hardening, the consequence is
that it will be unusable. The process must
therefore be developed in such a manner, that all
variables which can contribute towards stress
induction resulting in journal 'runout, must be
investigated and resolved.
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Variable stroke crank shaft for an internal combustion engineIsmail, Fareed January 2012 (has links)
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2012. / Our planet is continuously being depleted of its natural resources leading to a need to
conserve energy and the environment. One of the major energy consumers is the
conventional internal combustion engine. Many attempts have been made to make these
conventional internal combustion engines more efficient focusing mostly on the combustion
side of the engine.
The focus of this study is on the modification of the reciprocating and rotating components of
the sub-assembly of a conventional internal combustion engine. An in-depth review was
carried out on the fundamentals of spark ignition internal combustion engines and savings on
fuel consumptions.
A prototype single piston internal combustion engine was developed that can adjust its stroke
length. Lengthening or shortening the stroke and simultaneously extending or retracting the
connecting rod's travel distance, allows the internal combustion engine to function very
efficiently consequently reducing the free space between the piston and cylinder head at
TDC position. This allows the internal combustion engine to alter its power capability on
demand whilst maintaining relatively high compression efficiency. The method of altering the stroke length is achieved by manipulating gears situated internally
and externally of the engine sub-assembly. The control of these eccentric gears lowers or
lifts the crankshaft in a radial motion. The eccentrics also control the automatic extension or
retraction of the connecting rod's travel distance.
The externally concentric gears control the mechanism that allows the internal combustion
engine to change its capacity easily as adapted for automation. This study does not extend
into the automation issues of the external mechanism.
The prototype engine that was built could not endure vigorous testing and it failed after
running for a short while. The primary focus had been on the kinematics of the engine
mechanism - and to show whether the idea was feasible. The engine passed the kinematics
test but failed possibly due to dynamic loads. Investigating this requires measuring
instantaneous temperatures from which peak pressures can be deduced. This was not done
because it was outside the scope of the project.
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Investigation of cranking motionsHorst, Cecil Albert January 1951 (has links)
Progress in Industrial Engineering has consistently been closely associated with progress in measurement. The accuracy required for interchangeable parts in modern precision equipment became a reality only after years of development, refinement, and research in the field of measurement. The Standard Units for linear dimensions were at one period in history such inaccurate measures as “width of a man's hand", "the length of a man's foot", or "the normal reach of a man’s arm", When accurate standards based on the Standard Yard were comparatively recently accepted universally, there remained a serious problem in developing instruments that would measure small divisions accurately.
Mass production has emphasised the paramount importance of human relations in industry. Understanding and agreement between individuals demand an accurate measure of human effort and accomplishment. Time Study with primary emphasis on Work Simplification has proven so near the answer that it has been subject to unwarranted claims and therefore unjust criticism. Instruments for measuring the accomplishment of individuals have been developed to securities beyond ordinary demand. However, the level of performance of the individual remains purely a matter of human judgement, unless supported by extensive data taken from the measurement of a large number of individuals representing a true cross section of industrial workers.
Industrial Engineers have developed remarkable skill in judging the performance of individuals in relation to that which can be expected from the average worker who has been reasonably selected and reasonably trained, but similar skill might have been developed in judging the ”width of the average man's hand" or "the length of the average man's arm". An equitable measure of the time required to perform specific tasks demands a generally accepted standard that can be applied directly to the motions used in performing the task. We would then have a unit of measure with no more reason for objection than there might be today by someone who thought the yard should be somewhat longer or somewhat shorter than the accepted standard. / Master of Science
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An investigation of the effect of varying diameters on the time required for cranking motionsCantor, Jacob D. January 1951 (has links)
The original objectives of this thesis were two: 1.) to investigate the accuracy of standard time values for cranking motions determined by other persons and groups, and, 2.) to establish standard time values for cranking motions of diameters 11, 13, 15, 17, 19, 21, 22, 23, and 24 inches respectively. / Master of Science
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Effect of service on automobile crankcase oilsChiles, Walter Douglas January 1935 (has links)
Master of Science
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Untersuchung und Modellierung eines Dieselmotors zur Bestimmung von Verbrennungsmerkmalen aus der Motordrehzahl /Schmidt, Thorsten, January 1900 (has links)
Originally presented as the author's Thesis--Universität Karlsruhe. / Includes bibliographical references.
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Behavior of a cracked shaft during passage through a critical speedAndruet, Raul Horacio 24 November 2009 (has links)
The detection of cracks in structural components and the evaluation of their sizes without the need of removing them from the machine in which they are placed is very important for preventing failures. The objective of this thesis is to study the effects of cracks on the dynamic behavior of shafts under acceleration or deceleration, in order to find methods or procedures capable of detecting the presence of cracks prior to failure.
The equations of motion for a simply supported Bernoulli-Euler shaft are developed following Wauer's formulation. Galerkin's Method is used to obtain five-term approximate solutions. The first two natural frequencies are found for both the uncracked and cracked shaft. A computer program is written to perform the numerical integration of the equations. The shaft is subjected to several constant accelerations and decelerations. Tables and figures showing the results are presented along with discussions and comments related to the different runs made and the results obtained. The effect of the initial position angle of the eccentricity is studied to find the influence of this parameter. The effects of crack position and crack depth on the dynamic behavior of the shaft are also included in this work. Time histories and summary graphs are presented to make easier the interpretation of the results.
Final conclusions and future research proposals complete the work done in this thesis. / Master of Science
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