35 research outputs found
Modelling a novel orbital IC engine to aid further design.
Engine DesignThis project was aimed at developing an orbital internal combustion engine (ICE)
technology that is able to combust a wide range of fuels that can be converted into
useable energy that currently are not being utilized. The key difference that sets
this engine apart from all other internal combustion engine’s is that the combustion
chambers themselves rotate with the output shaft around a fixed cam.
Similar orbital engine’s were used earlier in the 20th century predominantly in
aircrafts. These engine’s faded out of production in the 1950’s due to high
maintenance demands due to worn cams and lubrication issues. With the today’s
technologic improvements, the shortfalls of the engine can now be mitigated with
advances in material science lubricants and manufacturing. These engine’s offer
comparatively high outputs and never before have they been modeled to explore
their true potential.
The concept engine being investigated operates at a very slow speed and has the
advantage of being able to alter the piston trajectory by altering the cam geometry.
This level of customization is impossible in traditional crank slider configurations.
The slower rpm allows the combustion of very low grade fuels that are currently
not being utilized commercially as an energy source while producing good output
when compared to current internal combustion technologies.
Conventional engine simulation software was used to explore the performance
potential for this engine configuration. An initial simulation model was verified
against an existing prototype and a second model was created to aid in a second
generation engine that is currently being developed. These models were used to
explore the engine’s capability and optimal configuration.
The results of a multitude of simulations were used to create a calculator for
industry that uses Microsoft excel to access and interpolate from the data to
predict performance for possible variants and to aid in future prototype designs
without the need for the software package.
The primary focus of the research was to investigate how engine performance was
affected by manipulating the piston trajectory, velocity and dwell time near TDC
and BDC by adjusting the cam profile. This has proven to have very large
implications concerning the engine’s output.
It was discovered that by prolonging the time the piston spent at the extremities of
its stroke (relative to crank rotation, or in this case, engine rotation) greatly
improved combustion and engine performance. Prolonging the time the piston
spends near bottom dead centre (BDC) allowed more time for air and fuel to enter
the combustion chamber. With the addition of a highly pressurized crankcase, this
proved to highly successful in improving performance at higher RPM.
Prolonging the time the piston spends near top dead centre (TDC) after ignition
lead too much higher pressure being developed during the power stroke, which is
advantageous for volumetric efficiency and combusting slower burning fuels.
Increasing the dwell time at TDC had the most benefit to performance
predominantly at lower RPM. These tuning capabilities make the engine very
versatile and highly desirable.
The results of tuning the piston trajectories using Ricardo Wave software has lead
to a potential 60% increase in peak torque on the engine as well as raising the
torque delivery over the entire RPM spectrum. This analysis also provided critical
information to aid in the development of the 2nd generation engine in respect to
breathing and the forces acting on each of the engine components.
This research into the influence of dwell and how it can be manipulated to improve
the efficiency of combustion is likely to have influences in other ICE applications
and development and help push the envelope for better efficiencies and the use of
alternative fuels
Военный химик Крамида
Рассказано о последнем периоде краткой, но по-своему яркой жизни заведующего спецлабораторией Сибирского химико-технологического института (ныне ТПУ) Константина Павловича Крамида
Einseitige Nähtechnik für die Herstellung von dreidimensionalen Faserverbundbauteilen
The objective of this work is the development of a new sewing technique, which allows the sewing of textile structures with access from one side. An industrial prototype is built in this work. Based on the existing ITA-sewing principle, a completely new machine is developed and used for the manufacturing of technical preforms for lightweight fibre reinforced plastic “FRP” products. For the fundamental design approaches of the machine development, all relevant machine and sewing features are identified and analysed. Additionally the influence of machine parameters on the sewing quality is tested and the effects of the sewing thread on the mechanical properties of FRP-parts are investigated in details. The economic potential of the developed sewing technique considering especially the production of FRP-parts is also analysed and presented
Einseitige Nähtechnik für die Herstellung von dreidimensionalen Faserverbundbauteilen
The objective of this work is the development of a new sewing technique, which allows the sewing of textile structures with access from one side. An industrial prototype is built in this work. Based on the existing ITA-sewing principle, a completely new machine is developed and used for the manufacturing of technical preforms for lightweight fibre reinforced plastic “FRP” products. For the fundamental design approaches of the machine development, all relevant machine and sewing features are identified and analysed. Additionally the influence of machine parameters on the sewing quality is tested and the effects of the sewing thread on the mechanical properties of FRP-parts are investigated in details. The economic potential of the developed sewing technique considering especially the production of FRP-parts is also analysed and presented