Emulation of an Electric Naval Propulsion System Based on a Multiphase Machine Under Healthy and Faulty Operating Conditions

2018 ◽  
Vol 67 (8) ◽  
pp. 6895-6905 ◽  
Author(s):  
Kamal Nounou ◽  
Jean Frederic Charpentier ◽  
Khoudir Marouani ◽  
Mohamed Benbouzid ◽  
Abdelaziz Kheloui
Keyword(s):  
Propulsion System ◽  
Operating Conditions ◽  
Multiphase Machine

Inlet Duct-Engine Exhaust Nozzle Airflow Matching for the Supersonic Transport

1968 ◽  
Vol 72 (690) ◽  
pp. 490-497
Author(s):  
J. B. Taylor
Keyword(s):  
Propulsion System ◽  
Operating Conditions ◽  
Design Parameters ◽  
Gas Generator ◽  
Propulsion Systems ◽  
Engine Exhaust ◽  
Supersonic Transport ◽  
Reliable Performance ◽  
Jet Nozzle ◽  
Secondary Air

Propulsion systems selected for commercial transports must provide efficient and reliable performance over a broad range of conditions. These aeroplanes are used over both short and long route segments, on non-standard days, and at a range of altitudes to meet air-line schedule requirements. This paper covers some of the design parameters that were considered in the integration of the induction system, secondary air system, jet nozzle and the basic turbojet gas generator for the SST. During recent years some of the most important gains in propulsion efficiency have resulted from the development of inlets, engines and exhaust nozzles which are matched over a broad range of operating conditions. An efficient propulsion system for a supersonic transport depends upon very close matching of these components. This, of course, requires a better understanding of the capabilities and limitations of each of these major components. For the supersonic transport, 50% or more of the gross weight will be comprised of propulsion system and fuel and less than 10% will be payload.

scholarly journals Optimal Design of Inlet Passage for Waterjet Propulsion System Based on Flow and Geometric Parameters

2019 ◽  
Vol 2019 ◽  
pp. 1-21 ◽  
Author(s):  
Weixuan Jiao ◽  
Li Cheng ◽  
Di Zhang ◽  
Bowen Zhang ◽  
Yeping Su ◽  
...  
Keyword(s):  
Velocity Ratio ◽  
Optimization Method ◽  
Hydraulic Performance ◽  
Numerical Results ◽  
Propulsion System ◽  
Operating Conditions ◽  
Geometric Parameters ◽  
Hydraulic Characteristics ◽  
Design And Optimization ◽  
Ship Speed

As an important overcurrent component in a waterjet propulsion system, the inlet passage is used to connect the propulsion pump and the bottom of the propulsion ship. The anticavitation, vibration, and noise performance of the waterjet propulsion pump are significantly affected by the hydraulic performance of the inlet passage. The hydraulic performance of the inlet passage directly affects the overall performance of the waterjet propulsion system, thus the design and optimization method of the inlet passage is an important part of the hydraulic optimization of the waterjet propulsion system. In this study, the hydraulic characteristics of the inlet passage in the waterjet propulsion system with different flow parameters and geometric parameters were studied by a combination of numerical simulation and experimental verification. The model test was used to verify the hydraulic characteristics of the waterjet propulsion system, and the results show that the numerical results are in good agreement with the test results. The numerical results are reliable. The hydraulic performance of the inlet passage is significantly affected by the inlet velocity ratio. There is a certain correlation between the hydraulic performance of the inlet passage and ship speed, and the hydraulic performance of the inlet passage is limited by ship speed. The geometric parameters of the best optimization case are as follows: the inflow dip angle α is 35°, the length L is 6.38D0, and the upper lip angle is 4°. The optimal operating conditions are the conditions of IVR 0.69–0.87.

Methods of Determination of the Fuel Consumption of the Locomotive Diesel-Electric Propulsion System for Regular Operating Conditions

2013 ◽  
Vol 597 ◽  
pp. 77-86
Author(s):  
Paweł Kortas
Keyword(s):  
Fuel Consumption ◽  
Electric Propulsion ◽  
Propulsion System ◽  
Operating Conditions ◽  
Measuring Error ◽  
Main Disadvantage ◽  
Utilization Data ◽  
Locomotive Diesel

In order to determine the fuel consumption during operation of locomotive it is necessary to work out the characteristics of fuel consumption vs. power produced by propulsion system. These characteristics can be obtained during tests in a diagnostic stand equipped with water rheostat, which allows to simulate any load on the main generator. Another method depends on utilization data from monitoring system of the propulsion system, obtained during regular operation of the locomotive. The main disadvantage of this method is lack of long-term constant loads, which is caused by frequently changing operating conditions. This has a major impact on the measuring error, which can be minimized by suitable utilization of a large number of measurements. Practical remarks of those methods usage have been presented in this paper.

scholarly journals Impact of a Hybrid Assisted Wheelchair Propulsion System on Motion Kinematics during Climbing up a Slope

2020 ◽  
Vol 10 (3) ◽  
pp. 1025 ◽  
Author(s):  
Bartosz Wieczorek ◽  
Łukasz Warguła ◽  
Dominik Rybarczyk
Keyword(s):  
Electric Propulsion ◽  
Propulsion System ◽  
Operating Conditions ◽  
Amplification Coefficient ◽  
Wheelchair Propulsion ◽  
Depth Analysis ◽  
Manual Propulsion ◽  
Number Of Cycles ◽  
The Hill ◽  
The Impact

Overcoming terrain obstacles presents a major problem for people with disabilities or with limited mobility who are dependent on wheelchairs. An engineering solution designed to facilitate the use of wheelchairs are assisted-propulsion systems. The objective of the research described in this article is to analyze the impact of the hybrid manual–electric wheelchair propulsion system on the kinematics of the anthropotechnical system when climbing hills. The tests were carried out on a wheelchair ramp with an incline of 4°, using a prototype wheelchair with a hybrid manual–electric propulsion system in accordance with the patent application P.427855. The test subjects were three people whose task was to propel the wheelchair in two assistance modes supporting manual propulsion. The first mode is hill-climbing assistance, while the second one is assistance with propulsion torque in the propulsive phase. During the tests, several kinematic parameters of the wheelchair were monitored. An in-depth analysis was performed for the amplitude of speed during a hill climb and the number of propulsive cycles performed on a hill. The tests performed showed that when propelling the wheelchair only using the hand rims, the subject needed an average of 13 ± 1 pushes on the uphill slope, and their speed amplitude was 1.8 km/h with an average speed of 1.73 km/h. The climbing assistance mode reduced the speed amplitude to 0.76 km/h. The torque-assisted mode in the propulsive phase reduced the number of cycles required to climb the hill from 13 to 6, while in the climbing assistance mode the number of cycles required to climb the hill was reduced from 12 to 10 cycles. The tests were carried out at various values of assistance and assistance amplification coefficient, and the most optimally selected parameters of this coefficient are presented in the results. The tests proved that electric propulsion assistance has a beneficial and significant impact on the kinematics of manual wheelchair propulsion when compared to a classic manual propulsion system when overcoming hills. In addition, assistance and assistance amplification coefficient were proved to be correlated with operating conditions and the user’s individual characteristics.

Research on Simulation and Experiment of Ship Complex Diesel-Electric Hybrid Propulsion System

2020 ◽  
Vol 64 (02) ◽  
pp. 171-184
Author(s):  
Nengqi Xiao ◽  
Xiang Xu ◽  
Baojia Chen
Keyword(s):  
Power System ◽  
Energy Management ◽  
Test Bench ◽  
Propulsion System ◽  
Operating Conditions ◽  
Hybrid Power System ◽  
Hybrid Propulsion ◽  
Hybrid Power ◽  
Operation Modes ◽  
And Control

This article introduces the composition and 12 operating conditions of a four-engine two-propeller hybrid power system. Through the combination of gearbox clutch and disconnection, the propulsion system has four single-engine operation modes, two double-engine parallel operation modes, and six PTI operation modes. Because the propulsion system has a variety of operating conditions, each operating condition has a form of energy transfer. As a result, its energy management and control are more complicated. To study the energy management and control strategy of a diesel- electric hybrid propulsion system, this work mainly studies the simulation model and sub-models of a diesel-electric hybrid propulsion system. In this study, MATLAB/ SIMULINK software is used to build the diesel engine model, motor model, and ship engine system mathematical model. The test and analysis were carried out on the test bench of the diesel-electric hybrid power system. By comparing the theoretical value of the SIMULINK simulation model with the test value of the test bench system, the correctness of each sub-model modeling method is verified. On the one hand, research on the text lays a theoretical foundation for the subsequent implementation of the conventional energy management and control strategy based on state identification on the unified management and distribution of the diesel-electric hybrid power system. At the same time, energy management of the diesel-electric hybrid system is also carried out. Optimization research provides theoretical guidance.

Design of Risk Prediction Assessment for Ship-Integrated Electric Propulsion System

2021 ◽  
pp. 1-9
Author(s):  
Pengfei Zhi ◽  
Zhiyu Zhu ◽  
Wanlu Zhu ◽  
Haiyang Qiu
Keyword(s):  
Risk Assessment ◽  
Risk Prediction ◽  
Electric Propulsion ◽  
Internal Combustion Engines ◽  
Viterbi Algorithm ◽  
Propulsion System ◽  
Operating Conditions ◽  
Assessment System ◽  
Electric Propulsion System ◽  
The Future

A design of risk prediction assessment is proposed to improve the safety and economy of ship-integrated electric propulsion system(SIEPS). Firstly, the article puts forward a multihidden Markov model (MHMM)–Viterbi algorithm to predict fault state probabilities of each component in the continuous time points in the future. Secondly, according to the influence of dynamic ocean condition, the fault states of the components of SIEPS are predicted by using the MHMM–Viterbi algorithm. Thirdly, the risk assessment system of network topology of SIEPS is designed, and power flow analysis under the abnormal condition is repeatedly calculated by using the MonteCarlo simulation. Finally, the article takes a SIEPS as an example and the risk prediction assessment results is given. Introduction With the establishment of increasingly stringent standards by the International Maritime Organization in terms of ship emissions and the increasing scarcity of petroleum resources, electric propulsion systems are gradually replacing internal combustion engines, which will become the future direction of ship power development. Electric propulsion ships do have many advantages such as high efficiency, high automation, environmental protection, energy saving, and emission reduction. However, ship-integrated electric propulsion system(SIEPS) is also the soft underbelly of electric propulsion ships. First of all, the complexity of the external environment factors such as high humidity and high salinity of ships (especially marine vessels) under long-term operating conditions, and the coupling of electromagnetic, thermal, and vibration signals of SIEPS will increase the failure rate of electrical equipment, thereby increasing the risk of SIEPS. Secondly, for electric propulsion ships, the SIEPS risk is likely to lead to chain failure of important systems such as power, control, navigation, resulting in the ship. Equipment and even personnel cause irreparable damage, causing fatal damage to electric propulsion ships. Therefore, in order to improve the safety, reliability, and economy of electric propulsion ships, it is necessary to carry out research on relevant technologies for SIEPS risk assessment (Wen et al. 2012; Guangfu et al. 2013).

scholarly journals Modelling and Experimental Validation of a Hybrid Electric Propulsion System for Light Aircraft and Unmanned Aerial Vehicles

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3969
Author(s):  
Massimo Cardone ◽  
Bonaventura Gargiulo ◽  
Enrico Fornaro
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Model Validation ◽  
Electric Propulsion ◽  
Combustion Engine ◽  
Propulsion System ◽  
Operating Conditions ◽  
Total Power ◽  
Electric Propulsion System ◽  
Aerial Vehicles ◽  
Hybrid Electric

This article presents a numerical model of an aeronautical hybrid electric propulsion system (HEPS) based on an energy method. This model is designed for HEPS with a total power of 100 kW in a parallel configuration intended for ultralight aircraft and unmanned aerial vehicles (UAV). The model involves the interaction between the internal combustion engine (ICE), the electric motor (EM), the lithium battery and the aircraft propeller. This paper also describes an experimental setup that can reproduce some flight phases, or entire missions, for the reference aircraft class. The experimental data, obtained by reproducing two different take-offs, were used for model validation. The model can also simulate anomalous operating conditions. Therefore, the tests chosen for the model validation are characterized by the EM flux weakening (“de-fluxing”). This model is particularly suitable for preliminary stages of design when it is necessary to characterize the hybrid system architecture. Moreover, this model helps with the choice of the main components (e.g., ICE, EM, and transmission gear ratio). The results of the investigation conducted for different battery voltages and EM transmission ratios are shown for the same mission. Despite the highly simplified model, the average margin of error between the experimental and simulated results was generally under 5%.

Performance Simulation of 3-Stage Gas Turbine CHP Plant for Marine Applications

2016 ◽  
Author(s):  
Zhitao Wang ◽  
Yi-Guang Li ◽  
Shuying Li
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Propulsion System ◽  
Operating Conditions ◽  
Intermediate Water ◽  
Performance Simulation ◽  
Marine Applications ◽  
Chp System

Energy saving and environment become important issues in power and propulsion generation industry. One of such examples is the marine transportation where a lot of energy from consumed fuel is wasted in exhaust and emissions are produced in vessel propulsion systems. The focus of this research is to look at a typical marine propulsion system where gas turbines are the prime movers and to investigate the potentials of a novel 3-stage gas turbine combined heat and power (CHP) system for marine applications. Such a CHP system may include a topping gas turbine Brayton cycle, an intermediate water Rankine cycle (WRC), and a bottoming organic Rankine cycle (ORC). In the system, gas turbine is connected with a generator to produce electricity, water Rankine cycle produces superheated steam driving steam turbine for electricity generation and/or for heating, and organic Rankine cycle is used to produce electricity by recycling low temperature energy. A thermodynamic model for the 3-stage CHP system is established to simulate the performance of the system at different power demand operating conditions. The developed performance simulation system has been applied to a typical model vessel propulsion system application. Based on the simulated results, it is evident that compared with a conventional 2-stage CHP cycle where only gas turbine topping cycle and water Rankine bottoming cycle are included, the introduction of the organic Rankine cycle can increase the power output by about 7% and improve the cycle thermal efficiency by about 3.52%.

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