scholarly journals Analyzing mechanical vibrations of an aircraft opposed piston engine

2021 ◽  
Author(s):  
Michał Biały ◽  
Łukasz Grabowski ◽  
Bartłomiej Skórzyński ◽  
Grzegorz Barański ◽  
Adam Majczak
Keyword(s):  
Test Bench ◽  
Piston Engine ◽  
Vibration Acceleration ◽  
Mechanical Vibrations ◽  
Drive Unit ◽  
Constant Torque ◽  
University Of Technology ◽  
Diesel Injection ◽  
Diesel Cycle ◽  
Acoustic Evaluation

The paper presents the results of the bench tests to measure mechanical vibrations of a new aircraft opposed piston engine with reciprocating pistons. The PLZ-100 engine is a three-cylinder, six-piston, two-shaft drive unit with a two-stroke diesel cycle. This type of engine is dedicated for powering light aircraft, e.g. autogyros. The tests were carried out on a test bench at the Lublin University of Technology. The engine was loaded with constant torque, for several fixed values of rotational speed of a crankshaft. The angle of the start of diesel injection was changed for each of the rotational speeds. The mechanical vibrations that accompanied the operation of this drive unit were recorded with three measurement transducers and a National Instruments conditioning system. Each of the transducers was mounted on a different axis of the engine. The signals were analyzed from their courses with the DIAdem software. The results were the courses of effective speed and vibration acceleration to conduct a vibration-acoustic evaluation of the PLZ-100, detect and prevent various types of defects or failures.

scholarly journals A detailed study of a cylinder activation concept by efficiency loss analysis and 1D simulation

2020 ◽  
Vol 5 (3-4) ◽  
pp. 159-172
Author(s):  
Thomas Buitkamp ◽  
Michael Günthner ◽  
Florian Müller ◽  
Tim Beutler
Keyword(s):  
Test Bench ◽  
Commercial Vehicle ◽  
High Load ◽  
Engine Test Bench ◽  
Drive Unit ◽  
Efficiency Loss ◽  
Gasoline Engines ◽  
Loss Analysis ◽  
Test Engine ◽  
Four Cylinders

Abstract Cylinder deactivation is a well-known measure for reducing fuel consumption, especially when applied to gasoline engines. Mostly, such systems are designed to deactivate half of the number of cylinders of the engine. In this study, a new concept is investigated for deactivating only one out of four cylinders of a commercial vehicle diesel engine (“3/4-cylinder concept”). For this purpose, cylinders 2–4 of the engine are operated in “real” 3-cylinder mode, thus with the firing order and ignition distance of a regular 3-cylinder engine, while the first cylinder is only activated near full load, running in parallel to the fourth cylinder. This concept was integrated into a test engine and evaluated on an engine test bench. As the investigations revealed significant improvements for the low-to-medium load region as well as disadvantages for high load, an extensive numerical analysis was carried out based on the experimental results. This included both 1D simulation runs and a detailed cylinder-specific efficiency loss analysis. Based on the results of this analysis, further steps for optimizing the concept were derived and studied by numerical calculations. As a result, it can be concluded that the 3/4-cylinder concept may provide significant improvements of real-world fuel economy when integrated as a drive unit into a tractor.

Automated Test Bench for Study of the Fuel Injection Process

2010 ◽  
Vol 166-167 ◽  
pp. 39-44
Author(s):  
István Barabás ◽  
Ioan Adrian Todoruţ ◽  
Levente Botond Kocsis ◽  
Doru Laurean Băldean
Keyword(s):  
Ambient Temperature ◽  
Pid Control ◽  
Closed Loop ◽  
Test Bench ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Computer Assisted ◽  
Injection Process ◽  
Diesel Injection ◽  
Fuel Jet

The paper presents the design, implementation and use of an automatic test bench for the injection process, using an economical solution for recording successive images of a fuel jet injected into a chamber pressurized with nitrogen at ambient temperature, with a camera. Injection pressure can be adjusted with high precision using a closed loop PID control (closed loop). The test bench operation is synchronized by a computer-assisted system. Experimental results are also summarized for research of the diesel injection process.

scholarly journals Separate direct injection of diesel and ethanol: A numerical analysis

2017 ◽  
Vol 21 (1 Part B) ◽  
pp. 451-463 ◽  
Author(s):  
Nicolae Burnete
Keyword(s):  
Direct Injection ◽  
Combustion Efficiency ◽  
Compression Ignition Engine ◽  
Ethanol Injection ◽  
Heating Value ◽  
Auto Ignition ◽  
Diesel Injection ◽  
Lower Heating Value ◽  
Main Injection ◽  
Diesel Cycle

The purpose of this study is to investigate the theoretical possibility of using a pilot diesel injection for the auto-ignition of a main ethanol injection in a compression ignition engine. To this effect a predictive simulation model has been built based on experimental results for a diesel cycle (pilot and main injection) at 1500 and 2500 min?1, respectively. For every engine speed, in addition to the diesel reference cycle, two more simulations were done: one with the same amount of fuel injected into the cylinder and one with the same amount of energy, which required an increase in the quantity of ethanol proportional to the ratio of its lower heating value and that of diesel. The simulations showed that in all cases the pilot diesel led to the auto-ignition of ethanol. The analysis of the in-cylinder traces at 1500 min?1 showed that combustion efficiency is improved, the peak temperature value decrease with approximately 240 K and, as a result, the NO emissions are 3.5-4 times lower. The CO and CO2 values depend on the amount of fuel injected into the cylinder. At 2500 min?1 there are similar trends but with the following observations: the ignition delay increases, while the pressure and temperature are lower.

Vibration Isolation of a Test Bench Founded on Sand Layer

2002 ◽  
Author(s):  
Juha-Matti Kivinen ◽  
Erno Keskinen ◽  
Robert Hildebrand ◽  
Ville Ja¨rvinen
Keyword(s):  
Preliminary Analysis ◽  
Vibration Isolation ◽  
Test Bench ◽  
Experimental Results ◽  
Paper Machine ◽  
Sand Layer ◽  
University Of Technology ◽  
Set Up ◽  
Machine Interaction

A modern paper machine is equipped with various finishing units e.g. calendars and coating units to produce better optical and printing properties. Today’s trend is to supply these finishing units with polymer covered rolls. Tampere University of Technology (TUT) has built up an experimental set-up to study both vibration phenomena and polymer behavior. One of the essential task is to determine and verify the soil-machine interaction. This paper presents the preliminary analysis of the vibratory behavior and experimental results of modal analyses.

scholarly journals Simultaneous energy harvesting and tribological property improvement

Friction ◽  
2021 ◽  
Author(s):  
Xiaofan Wang ◽  
Jiliang Mo ◽  
Huajiang Ouyang ◽  
Zaiyu Xiang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Test Bench ◽  
Original System ◽  
Vibration Energy ◽  
Surface Wear ◽  
Friction Test ◽  
Vibration Acceleration ◽  
Piezoelectric Elements ◽  
Two Degree Of Freedom ◽  
Friction Induced Vibration ◽  
Vibration Noise

AbstractIn this study, piezoelectric elements were added to a reciprocating friction test bench to harvest friction-induced vibration energy. Parameters such as vibration acceleration, noise, and voltage signals of the system were measured and analyzed. The results show that the piezoelectric elements can not only collect vibration energy but also suppress friction-induced vibration noise (FIVN). Additionally, the wear of the friction interface was examined via optical microscopy (OM), scanning electron microscopy (SEM), and white-light interferometry (WLI). The results show that the surface wear state improved because of the reduction of FIVN. In order to analyze the experimental results in detail and explain them reasonably, the experimental phenomena were simulated numerically. Moreover, a simplified two-degree-of-freedom numerical model including the original system and the piezoelectric system was established to qualitatively describe the effects, dynamics, and tribological behaviors of the added piezoelectric elements to the original system.

scholarly journals Impact of a locomotive engine modernization on fuel consumption

2021 ◽  
Vol 338 ◽  
pp. 01001
Author(s):  
Maciej Andrzejewski ◽  
Paweł Daszkiewicz ◽  
Patryk Urbański ◽  
Łukasz Rymaniak ◽  
Aleksandra Woch
Keyword(s):  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Test Bench ◽  
Negative Impact ◽  
Pollutant Emissions ◽  
Combustion Engines ◽  
Drive Unit ◽  
Rail Vehicles ◽  
Wear And Tear ◽  
Locomotive Engine

Vehicles used in rail transport are characterized by a long service life, which is caused, among others, by the high cost of their purchase. In Poland, the average age of freight diesel locomotives exceeds 40 years. Increasing the wear and tear of vehicles has an impact on many aspects of machine operation, including environmental pollution. Significant wear and degradation of the powertrain components contributes to the increase in pollutant emissions and fuel consumption, which is closely correlated with the production of carbon dioxide. Modernizations involving the replacement of the drive unit are performed in order to reduce the negative impact of rail vehicles on the environment. The article compares the energy consumption of the ST44 locomotive prior to and after modernization. The older 14D40 two-stroke internal combustion engines were replaced with a more modern engine unit 12CzN26/26. Fuel consumption tests were carried out on a test bench using a OW6300 water resistor.

scholarly journals Study on Flight Performance of Propeller-Driven UAV

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Rui-lin Liu ◽  
Zhong-jie Zhang ◽  
Yu-fei Jiao ◽  
Chun-hao Yang ◽  
Wen-jian Zhang
Keyword(s):  
High Performance ◽  
Performance Test ◽  
Test Bench ◽  
Engine Performance ◽  
Flight Performance ◽  
Flight Altitude ◽  
Piston Engine ◽  
Speed Range ◽  
Thrust Characteristics ◽  
Aerial Vehicle

The engine performance test at altitudes of 0-7000 m was carried out on the high-performance test bench of the Unmanned Aerial Vehicle (UAV) piston engine. The flight performance of UAV was studied, including propeller thrust characteristics, maneuverability, flight envelope, and cruise performance. The results showed that with the increase in altitudes, the UAV climb rate gradually decreased; the maximum climb rate decreased from 2.5 m/s at 2000 m to 0.5 m/s at 7000 m. The maximum flight altitude is 7000 m, and the flight speed range is about 47 m/s-52 m/s at the altitude of 7000 m. Maximum navigation range and endurance of UAV decrease by 5.8% and 8%, respectively, with each increment of 1000 m in altitudes.

Acoustic Diagnostics Applications in the Study of Technical Condition of Combustion Engine

2016 ◽  
Vol 41 (2) ◽  
pp. 345-350 ◽  
Author(s):  
Adam Deptuła ◽  
Dariusz Kunderman ◽  
Piotr Osiński ◽  
Urszula Radziwanowska ◽  
Radosław Włostowski
Keyword(s):  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Scientific Work ◽  
Internal Combustion ◽  
Technical Condition ◽  
Combustion Engines ◽  
Common Rail System ◽  
Drive Unit ◽  
University Of Technology ◽  
Acoustic Diagnostics

AbstractThe paper presents the possible applications of using acoustic diagnostics in inspecting the technical condition of an internal combustion engine with autoignition on the example of the Fiat drive unit with common rail system. As a result of measuring the sound pressure level for specific faults and comparing the noise generated by the motor running smoothly, the detailed maps of changes in the acoustic spectrum are possible to generate. These results may be helpful in the future diagnostics of internal combustion engines. In the paper, the results of scientific work in the area of research, design and operation of internal combustion engines, conducted at the Department of Automotive Engineering, in cooperation with the Laboratory of Hydraulic Drives & Vibroacoustics of Machines at the Wroclaw University of Technology are included.

scholarly journals Detection of inter-turn faults in transformer winding using the capacitor discharge method

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 979-983
Author(s):  
Michał Michna ◽  
Andrzej Wilk ◽  
Michał Ziółko ◽  
Marek Wołoszyk ◽  
Leon Swędrowski ◽  
...  
Keyword(s):  
Diagnostic Method ◽  
Test Bench ◽  
Superconducting Magnets ◽  
Diagnostic System ◽  
Superconducting Magnet ◽  
Accelerator Facility ◽  
Capacitor Discharge ◽  
University Of Technology ◽  
Transformer Winding ◽  
Discharge Method

AbstractThe paper presents results of an analysis of inter-turn fault effects on the voltage and current waveforms of a capacitor discharge through transformer windings. The research was conducted in the frame of the Facility of Antiproton and Ion Research project which goal is to build a new international accelerator facility that utilizes superconducting magnets. For the sake of electrical quality assurance of the superconducting magnet circuits, a measurement and diagnostic system is currently under development at Gdansk University of Technology (GUT). Appropriate measurements and simulations of the special transformer system were performed to verify the proposed diagnostic method. In order to take into account the nonlinearity and hysteresis of the magnetic yoke, a novel mathematical model of the transformer was developed. A special test bench was constructed to emulate the inter-turn faults within transformer windings.

Investigation of the Cavitation in High Pressure Diesel Injection Nozzles

2002 ◽  
Author(s):  
Ihab Baz ◽  
Jean-Claude Champoussin ◽  
Michel Lance ◽  
Jean-Louis Marie´
Keyword(s):  
Test Bench ◽  
Laser Light ◽  
Light Sheet ◽  
Cavitation Number ◽  
Injection System ◽  
Common Rail Injection System ◽  
Injection Process ◽  
Diesel Injection ◽  
Direct Measurements ◽  
Common Rail Injection

Laser light sheet and shadowgraphy techniques have been applied to investigate cavitation phenomena in the spray hole of Diesel injection nozzles. The nozzles were operated on a test-bench based on a Common Rail injection system. Rail pressures up to 50 MPa were used. The diesel test oil was injected into a chamber which could be pressurized up to 8 MPa. The local position and range of cavitation films, lying between the flow and the nozzle wall, as well as single bubbles could be observed at different instants of the injection process. The pictures of the light sheet experiment were compared with photographs taken by the shadowgraphy technique under the same injection conditions. Cavitation number estimates were obtained by direct measurements of nozzle sac pressures.

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