scholarly journals Mean value first principle engine model for predicting dynamic behaviour of two-stroke marine diesel engine in various ship propulsion operations

2021 ◽  
pp. 100432
Author(s):  
Congbiao Sui ◽  
Peter de Vos ◽  
Douwe Stapersma ◽  
Klaas Visser ◽  
Hans Hopman ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Dynamic Behaviour ◽  
Mean Value ◽  
Marine Diesel Engine ◽  
First Principle ◽  
Ship Propulsion ◽  
Engine Model ◽  
Marine Diesel

scholarly journals Multiple Model Predictive Functional Control for Marine Diesel Engine

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Runzhi Wang ◽  
Xuemin Li ◽  
Yufei Liu ◽  
Wenjie Fu ◽  
Shuang Liu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Mean Value ◽  
Open Loop ◽  
Marine Diesel Engine ◽  
Multiple Model ◽  
Pid Algorithm ◽  
Engine Model ◽  
Predictive Functional Control ◽  
Marine Diesel ◽  
Functional Control

A novel control scheme based on multiple model predictive functional control (MMPFC) is proposed to solve the cumbersome and time-consuming parameters tuning of the speed controller for a marine diesel engine. It combines the MMPFC with traditional PID algorithm. In each local linearization, a first-order plus time delay (FOPTD) model is adopted to be the approximate submodel. To overcome the model mismatches under the load disturbance conditions, we introduce a method to estimate the open-loop gain of the speed control model, by which the predictive multimodels are modified online. Thus, the adaptation and robustness of the proposed controller can be improved. A cycle-detailed hybrid nonlinear engine model rather than a common used mean value engine model (MVEM) is developed to evaluate the control performance. In such model, the marine engine is treated as a whole system, and the discreteness in torque generation, the working imbalance among different cylinders, and the cycle delays are considered. As a result, more reliable and practical validation can be achieved. Finally, numerical simulation of both steady and dynamic performances of the proposed controller is carried out based on the aforementioned engine model. A conventional well-tuned PID with integral windup scheme is adopted to make a comparison. The results emphasize that the proposed controller is with stable and adaptive ability but without needing complex and tough parameters regulation. Moreover, it has excellent disturbance rejection ability by modifying the predictive multimodels online.

Numerical investigation of interaction between propulsion system behaviour and manoeuvrability of a large containership

2021 ◽  
pp. 147509022110442
Author(s):  
Huan Tu ◽  
Hui Chen
Keyword(s):  
Diesel Engine ◽  
Coupled Model ◽  
Propulsion System ◽  
Marine Diesel Engine ◽  
Large Power ◽  
Engine Model ◽  
Ship Manoeuvring ◽  
System Behaviour ◽  
Marine Diesel ◽  
Actual Operation

In actual operation process of a ship, the engine-propeller-hull is an integrated system with internal coupling effects, and thus there is a close interaction between the diesel engine propulsion system operation conditions and the ship manoeuvring motions. The propulsion system can experience large power fluctuation during manoeuvring, with considerable torque increase with regard to the stabilized value in straight course. However, the diesel engine propulsion system behaviour and ship manoeuvrability are usually studied separately as they are considered to belong to different disciplines. Thus, it is difficult to reflect the actual operating characteristics of the propulsion system and ship manoeuvring motion under coupled conditions in actual operation. To investigate the interaction between the propulsion system behaviour and the manoeuvrability of a large containership, this paper proposed a multi-disciplinary ship mobility model capable of coupling the marine diesel engine model and the ship manoeuvring model. In the engine model, the mean value modelling approach was adopted to simulate the two-stroke marine diesel engine considering the fact that it can capture the performance of the engine sub-systems including scavenging receiver, exhaust gas receiver, turbocharger, etc. In the manoeuvring model, the MMG-based method was used to simulate the ship manoeuvring motion with three degrees-of-freedom. The engine model and manoeuvring model were coupled through the propeller model that transferring propeller speed and torque between the two models. The coupled model was validated against the engine shop test data and the sea trial results. By applying this coupled model, a series of simulations of turning circle manoeuvres under various scenarios were performed. The simulation results presented the dynamic response of engine internal sub-systems during turning circle manoeuvring, explained the effect of the torque limiter on engine performance and ship manoeuvring motion, and analyse the influence of different propulsion system control strategies on the ship turning circle manoeuvrability. Although the presented case study has been validated on a specific ship, most of the discussed models have a general application.

scholarly journals Model tests of a marine diesel engine powered by a fuel-alcohol mixture

2021 ◽  
Author(s):  
Marcin Zacharewicz ◽  
Tomasz Kniaziewicz
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Diesel Oil ◽  
Marine Diesel Engine ◽  
Engine Model ◽  
Marine Engines ◽  
Marine Diesel ◽  
The Mathematical Model

The paper presents the results of model and empirical tests conducted for a marine diesel engine fueled by a blend of n-butanol and diesel oil. The research were aimed at assessing the usefulness of the proprietary diesel engine model in conducting research on marine engines powered by alternative fuels to fossil fuels. The authors defined the measures of adequacy. On their basis, they assessed the adequacy of the mathematical model used. The analysis of the results of the conducted research showed that the developed mathematical model is sufficiently adequate. Therefore, both the mathematical model and the computer program based on it will be used in further work on supplying marine engines with mixtures of diesel oil and biocomponents.

scholarly journals Development and Validation of 4 Stroke Marine Diesel Engine Numerical Model

2020 ◽  
Vol 3 (3) ◽  
pp. 359-372
Author(s):  
Vladimir Pelić ◽  
Tomislav Mrakovčić ◽  
Ozren Bukovac ◽  
Marko Valčić
Keyword(s):  
Diesel Engine ◽  
Numerical Model ◽  
Zone Model ◽  
Marine Diesel Engine ◽  
Test Bed ◽  
Conservation Of Energy ◽  
Engine Model ◽  
Marine Propulsion ◽  
Marine Diesel ◽  
Development And Validation

Increasing demands on energy efficiency and environmental acceptance are being imposed on marine propulsion plants. The fulfilment of the conditions set by the MARPOL Convention, Annex VI, regarding the emissions from exhaust gases of marine diesel engines is of particular interest. This paper presents the development and validation of a zero-dimensional, single-zone diesel engine numerical model. Presented numerical model is based on the law of conservation of energy and mass and solving the resulting differential equations. The single-zone model will serve as the basis for a model where the cylinder space is divided into two or three zones during combustion. In this way, the multi-zone model will allow the modelling of nitrogen oxide emissions with satisfactory accuracy. Validation of the diesel engine model was carried out for the Wärtsilä 12V50DF 11700 kW motor designed to drive a synchronous alternator. Obtained results and deviations of certain parameters in the operation of the engine with respect to the data obtained from the measurements on the test bed, are more than satisfactory regarding complexity of the numerical model. This confirmed the usability of the model for research purposes to optimize the marine diesel engine.

Modelling of the propulsion plant of a large container ship by the partition of the cycle of the main diesel engine

2019 ◽  
Vol 234 (2) ◽  
pp. 475-489 ◽  
Author(s):  
Kamal Kharroubi ◽  
Oğuz Salim Söğüt
Keyword(s):  
Diesel Engine ◽  
Input Data ◽  
Model Building ◽  
Fine Tuning ◽  
Container Ship ◽  
Ship Propulsion ◽  
Engine Model ◽  
Simulink Model ◽  
Marine Diesel ◽  
Large Container

In this article, a mathematical replica of the propulsive installation of a large container ship is presented. The ship propulsion is accomplished by a large two-stroke marine diesel engine driving a marine propeller. The main new idea introduced by this research consists in using the Subsystem-Enabling feature available in the MATLAB Simulink® environment to control the execution of the working sequences of the main propulsion two-stroke diesel engine. The benefits brought by this model implementation approach are its simplicity and its applicability to all the blocks of the diesel engine model, these blocks can be created to represent one engine working sequence and then duplicated to represent the remaining engine sequences, and finally, the blocks related to each sequence can be grouped in subsystems and controlled by a single subsystem monitoring the engine events according to the value of the crankshaft angle; consequently, the overall Simulink model building and execution processes are much faster. The results generated by the simulation using the Simulink model of this diesel ship propulsion plant show that, for the production of acceptable results, only a small portion of the input data of the model needs to be exactly provided by the manufacturers of the components of the propulsion plant, whereas the rest of the data can be given reasonable initial values and adjusted during the model’s fine-tuning process. Finally, it is worth noting that the considerable amount of simulator-input-data available in this article can be used in any other simulation work to develop an identical simulator to the simulator of this article or to build a different one from scratch.

Two-part modelling approach for ship engine simulations

2015 ◽  
Author(s):  
M. Godjevac ◽  
P. de Vos ◽  
H. Zhou ◽  
C. Thiem
Keyword(s):  
Mean Value ◽  
Propulsion System ◽  
Component Model ◽  
First Principle ◽  
Transient Conditions ◽  
Ship Propulsion ◽  
Engine Model ◽  
Component Models ◽  
Modelling Approach

When simulating a ship propulsion system, it is often required to evaluate various characteristics of a ship propulsion system and the selected modelling approach changes according to the goal of the simulation. For example, data-based models are sufficient for simulations of steady state conditions while first principle models are more suitable for transient conditions. Additionally, it is often necessary to compare different propulsion configurations. For component models, this might require different modelling approaches to describe various performances and/or different sets of parameters used to describe different propulsion configurations. Even though there are various databases of ship component models, none of them allows the user to change the modelling approach or pre-set values of parameters used to describe the component models. In order to allow the changing of the modelling approach together with the parameters of the component models, a novel two-part modelling approach is proposed in this paper. The proposed approach separates the component model into two parts: process and parametric part. By adjusting the process part of the component model, the modelling approach can easily be changed. And by adjusting the parametric part of the component model, it is possible to adjust the component’s characteristics and accommodate different configurations. In this investigation, a mean value first principle diesel engine model has been selected as a case study to demonstrate the flexibility of the proposed approach. As shown in the paper, the proposed approach allows the user to combine the benefits of a first principle model with the accuracy of the data based models. Additionally, the functional mock-up interface (FMI) standard has been used in the investigation to show that the proposed approach can be used in different software environments.

Development of a real-time two-stroke marine diesel engine model with in-cylinder pressure prediction capability

2017 ◽  
Vol 194 ◽  
pp. 55-70 ◽  
Author(s):  
Yuanyuan Tang ◽  
Jundong Zhang ◽  
Huibing Gan ◽  
Baozhu Jia ◽  
Yu Xia
Keyword(s):  
Diesel Engine ◽  
Real Time ◽  
Marine Diesel Engine ◽  
Cylinder Pressure ◽  
Engine Model ◽  
Marine Diesel ◽  
Prediction Capability

The Application of Analytic Hierarchy Process in the Evaluation of Simulation Models of Marine Diesel Engine

2014 ◽  
Vol 525 ◽  
pp. 203-209
Author(s):  
Yuan Qing Wang ◽  
Guang Ren ◽  
Zeng Yan ◽  
Yang Hui Tan
Keyword(s):  
Diesel Engine ◽  
Analytic Hierarchy Process ◽  
Large Scale ◽  
Simulation Models ◽  
Mean Value ◽  
Marine Diesel Engine ◽  
Analytic Hierarchy ◽  
Engine Simulation ◽  
Marine Diesel ◽  
Hierarchy Process

Facing to the problem of hierarchical structure decision analysis which is made of scheme level + factor level + target level, the analytic hierarchy process gives a whole set of solution and process. This method is used to evaluate diesel engine simulation model. Evaluate original mean value model of large-scale low-speed marine diesel engine and the new one by this method. Calculated results prove this method is applicable.

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