scholarly journals Optimization of PID Governor Coefficient for Turbocharged Diesel Engine

2020 ◽  
Vol 8 (6) ◽  
pp. 1073-1076
Keyword(s):  
Objective Function ◽  
Error Function ◽  
Stability Diagram ◽  
Third Order ◽  
Turbocharged Diesel Engine ◽  
Engine Model ◽  
Time Period ◽  
Speed Fluctuation ◽  
Turbo Charger ◽  
Dimensional Parameters

The objective of this study is to find optimum governor coefficient for which fluctuation of engine speed is minimum, for given value of engine, turbo-charger, inlet and exhaust manifold characteristics. Current study uses the Wishnegradski Stability Diagram as suggested by V. I. Krutov [1], which graphically represents the dynamic response of governor based on the engine differential equation which is of the third order. For the load type of L = B cos (wt): The objective function is designed to minimize the integral squared error over a time period T, which is taken as 5seconds. The constraints are formed using Wishnegradski Stability Curves which are mathematically represented as x > 0 and xy – 1 > 0 y > 0, where x, y are non-dimensional parameters depending on engine characteristics and Ne is the error function. From the experimental data obtained by test on a marine turbo-charged, 6 cylinder engine model KTA-1150C-600 of the Kirloskar make, the optimized values of Kp, Ki and Kd were obtained as 798.94, 41.50 and 1137.4 respectively and corresponding objective function is 2.2202e-07 and amplitude of speed fluctuation is 2.6642e-04 rpm.

A More Effective Formulation of the Path Generation Mechanism Synthesis Problem

1994 ◽  
Author(s):  
Irfan Ullah ◽  
Sridhar Kota
Keyword(s):  
Objective Function ◽  
Error Function ◽  
Mathematical Optimization ◽  
Optimization Methods ◽  
Complex Nature ◽  
Mechanism Synthesis ◽  
Structural Error ◽  
Crank Angle ◽  
The Common ◽  
Selection Of

Abstract Use of mathematical optimization methods for synthesis of path-generating mechanisms has had only limited success due to the very complex nature of the commonly used Structural Error objective function. The complexity arises, in part, because the objective function represents not only the error in the shape of the coupler curve, but also the error in location, orientation and size of the curve. Furthermore, the common introduction of timing (or crank angle), done generally to facilitate selection of corresponding points on the curve for calculating structural error, has little practical value and unnecessarily limits possible solutions. This paper proposes a new objective function, based on Fourier Descriptors, which allows search for coupler curve of the desired shape without reference to location, orientation, or size. The proposed objective function compares overall shape properties of curves rather than making point-by-point comparison and therefore does not requires prescription of timing. Experimental evidence is provided to show that it is much easier to search the space of the proposed objective function compared to the structural error function.

scholarly journals Balancing and Simulation of a Double Crank-Rocker Engine Model for Optimum Reduction of Shaking Forces and Shaking Moments

2021 ◽  
Vol 8 (2) ◽  
pp. 237-245
Author(s):  
Anwr M. Albaghdadi ◽  
Masri B. Baharom ◽  
Shaharin A. Sualiman
Keyword(s):  
Dynamic Analysis ◽  
Objective Function ◽  
Conventional Method ◽  
Optimization Process ◽  
New Model ◽  
Engine Model ◽  
Design Variables ◽  
Driving Torque ◽  
Related Design ◽  
Shaking Moment

In this paper, a new configuration of Crank-Rocker (CR) model has been proposed by duplicating its mechanism. The method has been implemented to overcome vibration problem on a single-piston Crank-Rocker engine caused by system unbalance. The new method suggests combining conventional method of adding counterweights to reduce shaking forces and eliminating the inertial moments on system by implementing the new layout. A dynamic study of the new model is presented, then the objective function is derived and implemented to perform the optimization process. Related design variables and system constraints are introduced to determine attached counterweights optimized characteristics. For results validation, the simulation, dynamic analysis, and optimization process were conducted using ADAMS VIEW® software. The output results were presented and discussed to verify the validity of the suggested method. It was noticed that the method was very effective and has managed to reduce the total shaking forces by about 91%, shaking moment by about 66%; and the driving torque by 27%.

A least third-order cumulants objective function

1996 ◽  
Vol 3 (2) ◽  
pp. 91-99 ◽  
Author(s):  
Chi-Tat Leung ◽  
Tommy W. S. Chow ◽  
Y. F. Yam
Keyword(s):  
Objective Function ◽  
Third Order

Prediction and Analysis of Combustion Chamber Thermal Load of Heavy Vehicle at Different Altitudes

2013 ◽  
Vol 706-708 ◽  
pp. 1492-1495
Author(s):  
Xian Cheng Wang ◽  
Jun Biao Hu ◽  
Xing He ◽  
Meng Chao Guo
Keyword(s):  
Combustion Chamber ◽  
Thermal Load ◽  
Predictive Ability ◽  
Combustion Model ◽  
Heavy Vehicle ◽  
Turbocharged Diesel Engine ◽  
Engine Model ◽  
Chamber Temperature ◽  
Relative Errors ◽  
Different Altitudes

For the thermal load of a heavy vehicle is too high in plateau environment, based on Hiroyasu spray model and predictive combustion model, a turbocharged diesel engine model with environmental adaptive predictive ability was established. The experimental results of 3700m revealed that the simulation result relative errors were less than 5%. The research of combustion chamber temperature field was made. This method provides a fundamental basis for further design of the combustion chamber.

Geometrical Similarity Error Function-Innovative Adaptive Algorithm methodology in path generation synthesis of the four-bar mechanism using metaheuristic algorithms

2021 ◽  
pp. 095440622110157
Author(s):  
A Sardashti ◽  
HM Daniali ◽  
SM Varedi-Koulaei
Keyword(s):  
Objective Function ◽  
Adaptive Algorithm ◽  
Error Function ◽  
The Other ◽  
Synthesis Methods ◽  
Computer Memory ◽  
Path Generation ◽  
Cpu Time ◽  
Geometrical Similarity ◽  
Design Variables

This paper presents a novel methodology for path generation synthesis of the four-bar mechanism. A new objective function for the path generation synthesis problem, namely, the Geometrical Similarity Error Function (GSEF), is introduced. Indeed, GSEF assesses the similarity between generated and desired paths, and its number of design variables is less than those in the other synthesis methods. Then, using an Innovative Adaptive Algorithm (IAA), some operators are utilized for matching two similar paths. GSEF-IAA methodology has some significant advantages over the reported synthesis methods. The method is fast, takes much less CPU time, and saves a large amount of computer memory. Four path generation problems are solved using GSEF-IAA, and the results are compared with those of previous methods using some well-known optimization algorithms to demonstrate the efficiency of GSEF-IAA methodology.

Inverse kinematics solution of a new circumferential drilling machine for aircraft assembly

Robotica ◽  
2014 ◽  
Vol 34 (1) ◽  
pp. 98-117 ◽  
Author(s):  
Weidong Zhu ◽  
Biao Mei ◽  
Yinglin Ke
Keyword(s):  
Objective Function ◽  
Nonlinear Optimization ◽  
Inverse Kinematics ◽  
Geodesic Distance ◽  
Error Function ◽  
Optimization Method ◽  
Distance Functions ◽  
Drilling Machine ◽  
Orientation Error ◽  
Joint Coordinates

SUMMARYInverse kinematics solutions are the basis for position and orientation control of automated machines in their Cartesian workspace. This paper presents an efficient and robust inverse kinematics algorithm for a new circumferential drilling machine for aircraft fuselage assembly. After a brief introduction to the circumferential drilling machine and its forward kinematics, the paper discusses the nonlinear optimization method for solving inverse kinematics problems. The objective function is defined as a weighted combination of a position error function and an orientation error function. By representing orientation error as the geodesic distance between two points on a unit sphere, the paper proposes to define the orientation error function by using faithful geodesic distance functions, which are accurate approximations to the geodesic distance when it is small. For increased efficiency, robustness, and easy setting of initial values, the inverse kinematics problem is decomposed into two subproblems. The revolute joint coordinates are obtained by nonlinear optimization, and the prismatic joint coordinates are calculated with closed-form formulas. Numerical experiments show that the objective function defined with faithful geodesic distance functions is effective, and the proposed algorithm is efficient, robust, and accurate. The algorithm has been successfully integrated into the control system of the circumferential drilling machine. Preliminary drilling experiments show that the position accuracy of drilled holes is within ±0.5 mm, which is acceptable for the assembly of large aircrafts.

Unsteady Vortex Breakdown Phenomena in an Enclosed Cylindrical Container With a Rotating Endwall Disk

2019 ◽  
Author(s):  
Yuki Nakatsuka ◽  
Reima Iwatsu ◽  
Jae Min Hyun ◽  
Hide S. Koyama
Keyword(s):  
Unsteady Flow ◽  
Steady Flow ◽  
Vortex Breakdown ◽  
Polar Angle ◽  
Injection Technique ◽  
Cylindrical Container ◽  
Stagnation Points ◽  
Axial Oscillation ◽  
Time Period ◽  
Dimensional Parameters

Abstract A high-quality precision-controlled turntable apparatus was fabricated to probe the dynamic behavior of a viscous fluid contained in a cylindrical container. Vortex breakdown(s) produced by a rotating endwall disk was visualized by using a fluorescent dye injection technique, and its flow field was measured by using a particle image velocimetry. This flow is characterized by two non-dimensional parameters, i.e., the height-to-radius ratio H/R and the rotating Reynolds number Re = Ω2/v. Limiting boundaries for single, double and triple vortex breakdowns in steady flow were re-plotted to compare with the previous visualization studies of Escudier. The locations of stagnation points of the vortex breakdown bubble(s) in steady flow were measured quantitatively. The overall experimental results in the steady flow were in excellent agreement with Escudier’s data. In unsteady flow, the amplitude and time period of periodic axial oscillation, and the polar angle and time period of precession, were measured. The domains for periodic axial oscillation and for precession in unsteady flow were delineated.

MODULATION STABILITY OF WAVE PACKETS IN A THREE-LAYER HYDRODYNAMIC SYSTEM

2019 ◽  
pp. 30-35
Author(s):  
O. Avramenko ◽  
M. Lunyova
Keyword(s):  
Order Approximation ◽  
Wave Packets ◽  
Stability Diagram ◽  
Third Order ◽  
Weakly Nonlinear ◽  
The Third ◽  
Hydrodynamic System ◽  
Contact Surfaces ◽  
The Stability ◽  
Third Order Approximation

The article is devoted to the problem of propagation of weakly nonlinear wave-packets along contact surfaces in a three-layer hydrodynamic system "half space – layer – layer with rigid lid". The condition of solvability of the problem in the third-order approximation is obtained, the evolution equation is derived in the form of a nonlinear Schrodinger equation and the modulation stability condition for its solutions is obtained. The stability diagram and its analysis are presented for the solution which takes place in the case of the balance between dispersion and non-linearity.

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