Taiwan Association of Engineering and Technology Innovation: E-Journals
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Numerical Evaluation of the Performance of a Compression Ignition CNG Engine for Heavy Duty Trucks with an Optimum Speed Power Turbine
Full text linkThe turbocharged direct injection lean burn Diesel engine is the most efficient engine now in production fortransport applications. CNG is an alternative fuel with a better carbon to hydrogen ratio therefore permitting reducedcarbon dioxide emissions. It is injected in gaseous form for a much cleaner combustion almost cancelling some ofthe emissions of the Diesel and it permits a much better energy security within Australia. The paper discusses thebest options currently available to convert Diesel engine platforms to CNG, with particular emphasis to the use ofthese CNG engines within Australia where the refuelling network is scarce. This option is determined in the dual fueloperation with a double injector design that couples a second CNG injector to the Diesel injector. This configurationpermits the operation Diesel only or Diesel pilot and CNG main depending on the availability of refuelling stationswhere the vehicle operates. Results of engine performance simulations are performed for a straight six cylinder 13litres truck engine with a novel power turbine connected to the crankshaft through a constant variable transmissionthat may be by-passed when non helpful to increase the fuel economy of the vehicle or when damaging theperformances of the after treatment system
Innovative Design of Cam-Controlled Planetary Gear Trains
Full text linkThe objective of this paper is to perform the innovation design for the new structures of cam-controlled planetary gear trains (CCPGTs), based on the creative mechanism design methodology. Firstly, the design requirements and design constraints are summarized according to the kinematics characteristics of existing CCPGTs. Then, the (4, 5) and (5, 7) graphs are generated by the theory of number synthesis. After that, the atlas of feasible specialized graphs is obtained. Finally, the atlas of new designs is obtained through the particularization process. In addition, an illustrated example is given, and the feasibility of the design is verified by computer simulation using ADAMS software. The result indicates that news design can produce a more wide range of non-uniform motion than the existing design, therefore they are better alternatives for driving a variable speed input mechanism
Identification of Structural Parameters Using Combined Power Flow and Acceleration Approach in a Substructure
Full text linkThis paper presents the application of a power flow parameter to improve system identification results when used along with conventional acceleration matching techniques. In this paper the power balance concept is implemented in a substructure to estimate the stiffness and damping coefficients from time domain responses. Power flows are calculated using the time averaged product of force and velocity at the input and substructure interfaces of a substructure. The concept of power flow balance through the substructures is to equate the input power against the dissipated and transmitted powers and by reducing any imbalance to zero using optimization methods. No extra sensors are needed to include criteria of power flow balance along with acceleration matching. Numerical simulations are performed for substructures from a 10 degree-of-freedom (DOF) lumped mass system, a planar truss of 55 elements with 44 DOF and a cantilever beam of 20 elements to evaluate the feasibility of the proposed method. In numerical simulations, noise free and noise contaminated response measurements are considered. The Particle Swarm approach is used as the Optimization algorithm, and the fitness function is defined to minimize the error with weighted aggregation multi-objective optimization (MO) technique. The results demonstrate that the proposed combined method is more accurate in identifying the structural parameters of a system compared to conventional acceleration based matching methods
Introduction to the First Issue
Full text linkOn behalf of the Editorial Board, I am delighted to announce the publication of the inaugural issue of the International Journal of Engineering and Technology Innovation (IJETI), published by the Taiwan Association of Engineering and Technology Innovation (TAETI). IJETI is an international, multidiscipline, peer-reviewed scholarly journal, published quarterly for researchers, developers, technical managers, and educators in the field of engineering and technology innovation. The journal is intended as an outlet for scientists and academicians all over the world to promote, share, and discuss various new issues and developments with the community.
It is a great pleasure and honor to include in the first issue of IJETI, six papers written by leading researchers in the field. We would like to thank all these authors for their wonderful papers that we have selected for the first issue, and we also believe that they will make this into a valuable source for researchers and practitioners.
IJETI is now accepting submissions from perspective authors to be considered for publication and included in the future issues of the journal. Articles of original research, reports, reviews, and commentaries are welcomed by IJETI. For more information about the journal or the submission process, please visit the Journals page.
The efforts of many people have made this journal possible. First, I must acknowledge the assistance of the editorial board. They have helped to define the role of the journal, the review process, the format, and, in many cases, the content of the journal. Next, special thanks are given to the reviewers who are doing an amazing job by their timely and comprehensive reviews. Finally, I must acknowledge the staffs of the editorial office, who have worked for so many months to compile this first issue and complete the website
Quaternion and Its Application in Rotation Using Sets of Regions
Full text linkThis paper is written to aid the readers to understand application of Euler angles and quaternion in representing rotation of a body in 3-dimensional Euclidean space,3ℜ. Application of quaternion would later require conversion of the quaternion to Euler angles. This is to enable quaternion to be compatible with other applications which use Euler rotation sequence to represent rotation. Thus, a framework to convert a quaternion, which is produced from a random rotation sequence to Euler angles with any specified rotation sequence is proposed and demonstrated here, to aid practitioners to use quaternion in their applications. This will also enable quaternion to be applied in arbitrary sequence onto applications developed using certain rotation sequence of Euler angles. Finally, a program is developed using Matlab-simulink software to demonstrate application of quaternion in maneuvering orientation of a missile flying in 3D space. Six degree of freedom (6DoF) block, which employs Euler rotation sequence of XYZ, is used to aid users to graphically see the maneuvering of the missile’s orientation as it flies in 3-dimensional Euclidean space. Quaternion, which is produced from random rotation sequence keyed in by the user, is converted to Euler angles with rotation sequence XYZ by using the proposed method.Keywords
Optical Design of Full View Lens based on Energy Luminance Analysis Chart of Stray Light
Full text linkThis paper presented optical design software (CODE V) in combination with stray light simulation software (Light Tools) to develop and analyze the influence of 360 degree lens stray light on MTF. We study the pupil entrance position of 2P3G lens group, set the pupil entrance position of the same inside-aperture lens which locates in the Lens 2(S2) or Lens 3(S1) surface. After simulation and analysis of ray tracing software, we get the best pupil entrance position of the lens to achieve the best efficiency and resolution. In addition, through the energy luminance analysis chart of stray light, comparison between this simulation and the actual test verifies that this design is consistent with the fact, so this method provides a reference for the future optical design and manufacture
Integral Backstepping Control for a PMLSM Using Adaptive RNNUO
Full text linkDue to uncertainties exist in the applications of the a permanent magnet linear synchronous motor (PMLSM) servo drive which seriously influence the control performance, thus, an integral backstepping control system using adaptive recurrent neural network uncertainty observer (RNNUO) is proposed to increase the robustness of the PMLSM drive. First, the field-oriented mechanism is applied to formulate the dynamic equation of the PMLSM servo drive. Then, an integral backstepping approach is proposed to control the motion of PMLSM drive system. With proposed integral backstepping control system, the mover position of the PMLSM drive possesses the advantages of good transient control performance and robustness to uncertainties for the tracking of periodic reference trajectories. Moreover, to further increase the robustness of the PMLSM drive, an adaptive RNN uncertainty observer is proposed to estimate the required lumped uncertainty. The effectiveness of the proposed control scheme is verified by experimental results