Engine Motor Research Articles

Application of copper-zinc metal as a catalytic converter in the motorcycle muffler to reduce the exhaust emissions

One of the main sources of air pollution is exhaust emission from vehicles. In the developing countries such as Indonesia, the most highest number of vehicles is motorcycle. Some of gas components from the exhaust emission that are commonly measured are carbon monoxide (CO) and hydrocarbon (HC). One of technology that can reduce the emission of CO and HC is the use of catalytic converter in the motorcycle’s exhaust system/muffler to assist the oxidation of carbon monoxide (CO) and hydrocarbon (HC). In the present study, Copper-Zinc (Cu-Zn) metal was selected as the catalyst. The selection of this combination of non-noble metals is due to their low cost materials, abundant materials, low cost production, and low-temperature oxidation). The objective of this study are to prepare the catalytic converter based on non-noble metal (i.e. Cu-Zn) and to study the performance of the catalytic converter installed in the muffler in converting exhaust gases of CO and HC into less harmful gases. The effect of two different motor engine rotation speeds (i.e. 2000 and 2500) on the conversion of CO and HC was also studied. The analysis of the emission from the muffler was carried out using gas analyzer. Additionally, the kinetic of oxidation reaction of CO and HC was also studied using pseudo homogeneous approach. The emission analysis results show that the use of Cu-Zn catalyst was effective to decrease the emission level of CO and HC. The CO and HC concentration level decreased up to 47.71 % at 2000 rpm and 55.34 % at 2500 rpm, respectively.

Innovations in education and approaches to assessment of regional educational systems

The analysis of the latest innovations in the Russian education and trends in the development of educational regional systems is provided. Approaches to assessing the effectiveness of the operation of the company-university system are discussed by an example of motor engineering training for the oil and gas industry.

Boosting the Octane Rating of Petrol: A Review of the Trends and Impacts on the Environment

An important quality of petrol (also called motor spirit or gasoline) is its octane rating (number) which is a measure of how resistant petrol is to the abnormal combustion phenomenon known as knocking (detonation or pinging). Petrol with low octane rating will burn uncontrollably in motor engine resulting loss of power, fuel wastage, and ultimately total engine failure. At the design level, increasing the octane number of petrol meant that the engine compression ratio could be raised to maximized power output. Straight-run motor spirit is characterized by low octane number and was only suitable for the earlier engines with low compression ratios. Latter demands for more powerful engines call for increase in compression ratios of the latter designed engines. The challenge however, was that these latter engines could not run on low quality petrol (with low octane rating). Various additives were sought to boost the octane rating of petrol, and more recently refinery reconfiguration is being given much attention. This work peruses the trends towards boosting the octane quality of petrol, highlighting the impacts of these trends to the sustainability of the environment.

The use of matic (automatic transmission of motorcycle) as catamaran boat engine to support economic activities in Ujung Pangkah, Gresik

River is the only access to enter the pond area in Ujung Pangkah District, Gresik. The area is difficult to access due to the siltation of the river with only 50 cm depth. In addition, rent for traditional boat is expensive. This research developed a design of a small boat efficient enough to transport fish farmer from and to the pond area. Engine from motorcycle was used as it was easy to operate and economical use of fuel. The fundamental change for this design was a small double-hulled low-lane vessel. The motor matic engine was adjusted to a propeller to get maximum boost. The results showed that a ship with 3 meters length, 1.2 meters width and 1 m height, 2 persons in charge and speed of 7 knots, could use 150cc automatic motor engine by lowering engine rotation (RPM) from 7000 RPM to 4500 RPM using a Gear Box and 4-leaf B-Serries blades with a diameter of 14 cm.

High prevalence and risk factors of hepatitis B, C and E infections among Middle Eastern countries

agents infect the liver through fecal oral (hepatitis A) or blood and other body secretions (hepatitis and C). The aim of this systematic review was the determination of status and risk factors of hepatitis agents among East countries. For this systematic review, the terms transmission route, prevalence/ rate, Middle East, Africa, Hepatitis B and Hepatitis were searched from motor engines of Google Scholar, PubMed, Science Direct, Scopus and SciVerse. Exclusion criteria were migrants to the region and healthy carriers. The results showed that the presence of hepatitis and C viruses in poor and populated areas, mostly in North Africa. B, as the most common infectious disease in the world, especially in Africa was found with a high endemic status except for Tunisia and Morocco. Moreover, it was demonstrated that Palestine, Yemen, Egypt, Oman, Jordan, and Saudi Arabia have high hepatitis endemic features. The prevalence of HCV has been reported as high in 12 MENA countries in 2010. E was determined to be in a high prevalence among countries of the region. The results showed that the presence of hepatitis and C viruses in poor and more populated areas, mostly in North Africa is very high. A was found at a very high rate among young children in several countries in this region. B, as the most common infectious disease in the world, especially in Africa was found with a high endemic status except for Tunisia and Morocco. Moreover, it was demonstrated that Palestine, Yemen, Egypt, Oman, Jordan, and Saudi Arabia have high hepatitis endemicity. The prevalence of hepatitis C virus (HCV) has been reported as high in 12 MENA countries in 2010. E was determined to be in a high prevalence among countries of the region.

Numerical Prediction of Cyclic Variability in a Spark Ignition Engine Using a Parallel Large Eddy Simulation Approach

Cycle-to-cycle variability (CCV) is detrimental to IC engine operation and can lead to partial burn, misfire, and knock. Predicting CCV numerically is extremely challenging due to two key reasons. First, high-fidelity methods such as large eddy simulation (LES) are required to accurately resolve the in-cylinder turbulent flow field both spatially and temporally. Second, CCV is experienced over long timescales and hence the simulations need to be performed for hundreds of consecutive cycles. Ameen et al. (2017, “Parallel Methodology to Capture Cyclic Variability in Motored Engines,” Int. J. Engine Res., 18(4), pp. 366–377.) developed a parallel perturbation model (PPM) approach to dissociate this long time-scale problem into several shorter time-scale problems. This strategy was demonstrated for motored engine and it was shown that the mean and variance of the in-cylinder flow field was captured reasonably well by this approach. In the present study, this PPM approach is extended to simulate the CCV in a fired port-fuel injected (PFI) spark ignition (SI) engine. The predictions from this approach are also shown to be similar to the consecutive LES cycles. It is shown that the parallel approach is able to predict the coefficient of variation (COV) of the in-cylinder pressure and burn rate-related parameters with sufficient accuracy, and is also able to predict the qualitative trends in CCV with changing operating conditions. It is shown that this new approach is able to give accurate predictions of the CCV in fired engines in less than one-tenth of the time required for the conventional approach of simulating consecutive engine cycles.

The selection of flying roller as an effort to increase the power of scooter-matic as the main power of centrifugal pump for fire fighter motor cycle

In densely populated settlements, fires often occur and cause losses. In some instances, the process of the occurrence of fires takes place so quickly that to reduce and avoid the occurrence of a fire disaster effort is required in accordance with the existing environmental condition. Fire fighter motorcycle by using motorcycle scooter-matic is considered suitable as one alternative to combating fire hazard in densely populated residential settlements. The use of motorcycle engines as the driving force of the pump often leads to unstable and not optimum power. Thus, the water spray on the centrifugal pump also becomes not maximum. To increase the engine power at scooter-matic engine idle rotation (700-2000 rpm), then the flying roller replacement with certain mass weight becomes an option. By selecting a 10 to 14 gram flying roller mass, the power analysis using a dynotest engine produces several variations. Of the calculation, the mass of a 14 gram flying roller provides a significant increase in motor power on the upper rotation. Meanwhile, on the lower power rotation using a flying roller with a mass of 10 grams provides an increase in power compared to a standard flying roller on a scooter matic motor engine. As a reference to the use of scooter-matic motor power as the pump power, the result of use of the flying roller with a mass of 10 grams becomes the best option.

Hierarchical Energy Optimization Strategy and Its Integrated Reliable Battery Fault Management for Hybrid Hydraulic-Electric Vehicle

Reduction of fuel consumption is an indispensable part of automotive industry in recent years. This induces several developments of hybrid vehicles with different structures. This paper deals with reliable and robust energy management strategy for a hybrid hydraulic-electric intelligent vehicle. The main objective of this paper is the development of a suboptimal control strategy based on fuzzy logic and neural network for minimizing total energy consumption while ensuring a better battery life. For this purpose, fuzzy supervisory fault management, which can detect and compensate the battery faults, regulates all of the possible vehicle's operation modes. Then, control strategy based on fuzzy logic controller (FLC) is developed. The FLC membership function parameters are tuned by employing neural network to manage power distribution between electric motor and internal combustion engine (ICE). Control strategy is switched between optimized FLCs to enhance the suboptimal power split between the different energy sources and manage the ICE to work always in the vicinity of its optimal condition. Finally, a robust fuzzy tuning controllers are investigated to give a good torque set point tracking. Simulation results, while using TruckMaker/MATLAB software, confirm that the proposed approach leads to suboptimal energy consumption of the vehicle for any unknown driving cycles and compensate battery faults effects.

Neutron imaging and tomography: Applications in food science

Neutron imaging and tomography allow observing the structure of large objects (from few to hundred centimeters) at a resolution around 100 μm. This nondestructive method is based on the detection of the transmission of a neutron beam through an object in 2D (imaging) or 3D after rotating the sample (tomography). The components of the object attenuate the neutron beam differently, depending on their composition, and produce accurate pictures of objects which give information about their structure. Neutron imaging has been used for quality control purposes in industries (aircraft, motor engineering...), but also find application from materials sciences (fuel cells, lithium batteries) through earth science (petrology, geology) to cultural heritage. More recently studies have been performed on food science topics.

Torque coordination control strategy in engine starting process for a single motor hybrid electric vehicle

To troubleshoot the oversized output torque ripple during engine starting process of parallel hybrid electric vehicle (HEV), the engine starting process is divided into cranking phase, speed synchronisation phase and after-ignition phase. In this paper, the expressions of the vehicle jerk are derived from the vehicle dynamic formula in each phase, and the influences of various parameters on the jerk are analysed. The coordinated control strategy between the clutch pressure and motor torque, and that between the motor torque and engine torque are proposed. The simulation for the single shaft HEV model is carried out through MATLAB/SIMULINK by which rationality of the control algorithms was checked. Finally, a bench test is implemented whose results prove the determined change rate of clutch pressure, motor torque, and engine torque can effectively coordinate to meet the need of vehicle ride performance in engine starting in-motion process.

The Role of Hydrogen Bonds Of The Azeotropic Hydrous Ethanol Fuel Composition To The Exhaust Emissions

In this study observed the role of hydrogen bonding to the composition of exhaust emissions which is produced hydrous ethanol fuel (95.5% v). Testing is done by using single cylinder four stroke motor engine. The composition of exhaust gas emissions is tested using exhaust gas analyzer on lean and stoichiometry mixer. The exhaust emissions produced by anhydrous ethanol were also tested. The composition of emissions produced by that two fuels is compared. The results showed CO emissions levels produced by hydrous ethanol are slightly higher than anhydrous ethanol in stoichiometric mixtures. But the composition of CO hydrous ethanol emissions is lower in the lean mix. If lean the mixer the different in the composition of emissions is increasing. On hydrous ethanol emission CO2 content little bit lower on the stoichiometric mixer and higher on the lean mixture. Exhaust emissions of ethanol fuel also produce O2. O2 hydrous ethanol emissions is higher than anhydrous ethanol fuel.

Analisis Prosedur Perawatan Mesin Motorizer Sedimen di PDAM Tirta Pakuan Kota Bogor

This research have objective to determine the application of procedures, mismatches work processes and maintenance of machinery repair and analyze the causes of motor engine damage in the PDAM Tirta Pakuan Bogor City. The data used in this research are primary and secondary data. Primary data obtained through observations and interviews to the parties concerned in the mechanical and electrical parts. Secondary data in the form of data SOP maintenance and repair machine from company. Descriptive, comprative, and evaluative methods are used to analyze the actual condition and working procedures of maintenance and repair of machinery and to compare between the results obtained from this research on the implementation of the maintenance work process and the repair of machines there are still stages that are not executed according to the procedure. Using the Fishbone Diagram method, the most dominant type of damage occurring in the motorizer engine is a burning roll with a contribution rate of 53.125%. Using Pareto Diagram, this analysis can provide information for the company to pay more attention to the maintenance and repair activities of the machine so that the work process activities in the mechanical and electrical section run well and smoothly.

ANALYSIS ON THE ROLE OF ENGINE COOLANT TEMPERATURE SENSOR IN GASOLINE ENGINE

A gasoline motor engine using electronic control system has several sensors and actuators driven by a computer. This paper aims to reveal the role of an engine temperature sensor mounted on a gasoline engine motor. The test ing data shows that there is a co nnectivity between the temperature data obtained from the cool ant temperature sensor with the fuel injection time and the exhaust gas emission content.

Investigation of real gas effects on combustion and emissions in internal combustion engines and implications for development of chemical kinetics mechanisms

Real gas effects on combustion and emissions in internal combustion engines are investigated using three-dimensional computational fluid dynamics. The Peng–Robinson equation of state is implemented to describe pressure–volume–temperature relationships and to calculate thermodynamic properties and relevant partial derivatives. Four facilities are modeled, including non-reacting compression in a motoring engine, combustion in a conventional diesel combustion engine and in a reactivity controlled compression ignition engine, as well as for a non-reacting reflected wave in a shock tube. It is found that the real gas effects of gas mixtures in practical internal combustion engine operation are sensitive to the operating load and the amount of premixed fuel. Excellent agreement against experiments was found for engine simulations with the Peng–Robinson equation of state in terms of cylinder pressure and apparent heat release rate. However, discrepancies with predictions from the ideal gas law grow with increased load and larger amounts of premixed fuel. In particular, the predicted emissions of soot, NOx, CO and unburnt hydrocarbons show increasing sensitivity to real gas effects as a result of changes in combustion phasing. Fuel condensation is also modeled using a vapor–liquid phase equilibrium solver and significant dependency on the equation of state used is found. Therefore, it is recommended to include real gas effects in internal combustion engine modeling to capture combustion and emissions characteristics accurately. Additionally, the results emphasize the role of real gas effects on reaction rates. Shock tube simulations are used to demonstrate the importance of using the real gas equation of state in the interpretation of chemical kinetic measurements. Significantly different compressed gas temperatures behind the reflected shock are predicted when real gas effects are considered. This needs to be realized when developing chemical kinetic models and rate constants for engine applications from shock tube data.

Encouraging Employees to Increase the Labor Intellectualization Level as a Factor of Evolution of the Intellectual Capital

1. Introduction Nordin, Simeh, Shariff and Baharim (2007), proved in their studies that there is a relationship between the price of crude oil and biodiesel. The results showed that the increase in oil prices during the period of the last few years encouraged some countries to begin to pay attention to the use of alternative fuels, among others from the plant (biodiesel). The increase of petroleum will increase biodiesel production. Ramli, Abas, R. and Ayatollah (2007) in their studies proved that the crude oil price is affected by biodiesel, the first derivative product of palm oil which produces palm oil (known as crude palm oil or abbreviated with CPO), utilizing biodiesel which comes from palm oil, the results showed that the biodiesel increase has affected the crude palm oil price. The development industries based on this CPO in addition directed to produce food products such as cooking oil, margarine, shortening, Cocoa Butter subtitute (CBS), and vegetable ghee, it is also directed to produce non-food products, such as industrial oleochemical primary (fatty acid, fatty alcohol, glycerin) and other oleochemical derivatives, namely surfactants, cosmetics, farmacy, and bioenergy. Oil palm plantations and palm oil industry as a means to improve the socio-economic conditions of rural communities through the implementation of operations Inti-Plasma programs (Zen et al., 2006). When the world oil price increases, many countries use CPO as raw material of bio-diesel fuel as a substitute (Karuppuswamy, Sundararaj and Elangovan, 2007; Pociovalisteanu et al., 2010; Thalassinos and Politis, 2012; Thalassinos et al., 2012). These conditions favor the use of biodiesel as a variety of targets alternatives to fossil energy applied to several countries in the world (Kennerly and Neely, 2003). In 2020, the European Union set a target of 10 percent biofuels of raw palm oil. Zen, Barlow and Gondowarsito (2006) studied that the crude oil prices have an influence on the palm oil as pointed out by Ahuja and Khamba (2008). It has been proved that there is an influence of biodiesel on the production of palm oil. The research result on the biodiesel and its impact on crude palm oil and its implications for palm oil, showed that the growing number of biodiesel has a positive and significant effect towards crude oil palm as well as the implications for the production of palm oil rises (Ashayeri, 2007). The increase of demand and the use of palm oil as a fuel is expected to cause disruption of the availability of CPO as raw materials for food, especially palm oil (Chand and Shirvani, 2000; Enkawa and Schvaneveldt, 2001). Novelty of this research is to add the existing variables into world oil price of the biodiesel and its impact on crude palm oil and its effect on oil palm. 2. Theory and Hypothesis As Santoso (2014) has pointed out bio-diesel is a natural renewable energy source that made from biomass or vegetable oil. As the bio-diesel has physical properties very similar to petroleum derived diesel fuel or ADO (Automobile Diesel Oil), bio-diesel has been used for motor engine since 1880's. In 1920's, bio-diesel production infrastructure has been nearly eliminated since diesel engine manufacturers altered their engine to utilize petroleum diesel that was much cheaper than Bio-diesel production. Recently, an increase on oil consumption, crude oil price, and ADO import have lead to consider bio-diesel utilization for transportation sector in Indonesia. An increase of the crude oil price that lead to a decreasing cost differential for bio-diesel production, bio-diesel utilization as alternative energy source in Indonesia is a real possibility. Some environmental impact concerns would also increase the bio-diesel utilization prospect. Oil palm is a highly profitable crop adapted to the humid tropics and the area devoted to this crop is likely to expand significantly in the future. It has many environmentally favourable attributes over its full life cycle. …

Correlation of CCV Between In-Cylinder Swirl Ratio and Polar Velocity Profile in Valve Seat Region Using LES Under Motored Engine Condition

An analysis of Transparent Combustion Chamber (TCC3) engine Large-Eddy Simulation (LES) result was carried out to investigate Cycle-to-Cycle Variation (CCV) correlation between in-cylinder swirl ratio and flow in the valve seat region of the intake port to address a challenging question on “What causes CCV of in-cylinder flow”. Polar Velocity (PV) profile, mean velocities normal to a ring-shaped cutting surface in the valve seat region, is calculated to depict intake port flow. A Net Polar Velocity (NPV) can be defined by performing the vector sum of the polar velocity around the intake valve. A standard deviation of PV is also calculated from azimuthal distribution of PV magnitudes relative to its mean value. The analysis of 18 LES cycles of TCC3 engine with a two-valve, pancake-shaped combustion chamber shows that similar CCV of in-cylinder swirl ratio patterns are observed at different crank angles from Intake Valve Opening (IVO) to Exhaust Valve Opening (EVO). Further analysis shows clear correlations of CCV between in-cylinder swirl ratio and NPV magnitude and the standard deviation of PV at selected crank angles from IVO to EVO. The correlations get significantly better with the ring-shaped cutting surface moves from up-stream to downstream of the valve-seat region. This study reveals that the CCV of in-cylinder swirl ratio is built up gradually from upstream to downstream in the intake port and valve-seat region. Further evaluation of the analysis method is planned for a four-valve engine as an evaluation metric for better engine intake port design and combustion chamber optimization.

The Influence of Crude Oil Price in Biodiesel and its Implication on the Production of Palm Oil: The Case of Indonesia

1. Introduction Nordin, Simeh, Shariff and Baharim (2007), proved in their studies that there is a relationship between the price of crude oil and biodiesel. The results showed that the increase in oil prices during the period of the last few years encouraged some countries to begin to pay attention to the use of alternative fuels, among others from the plant (biodiesel). The increase of petroleum will increase biodiesel production. Ramli, Abas, R. and Ayatollah (2007) in their studies proved that the crude oil price is affected by biodiesel, the first derivative product of palm oil which produces palm oil (known as crude palm oil or abbreviated with CPO), utilizing biodiesel which comes from palm oil, the results showed that the biodiesel increase has affected the crude palm oil price. The development industries based on this CPO in addition directed to produce food products such as cooking oil, margarine, shortening, Cocoa Butter subtitute (CBS), and vegetable ghee, it is also directed to produce non-food products, such as industrial oleochemical primary (fatty acid, fatty alcohol, glycerin) and other oleochemical derivatives, namely surfactants, cosmetics, farmacy, and bioenergy. Oil palm plantations and palm oil industry as a means to improve the socio-economic conditions of rural communities through the implementation of operations Inti-Plasma programs (Zen et al., 2006). When the world oil price increases, many countries use CPO as raw material of bio-diesel fuel as a substitute (Karuppuswamy, Sundararaj and Elangovan, 2007; Pociovalisteanu et al., 2010; Thalassinos and Politis, 2012; Thalassinos et al., 2012). These conditions favor the use of biodiesel as a variety of targets alternatives to fossil energy applied to several countries in the world (Kennerly and Neely, 2003). In 2020, the European Union set a target of 10 percent biofuels of raw palm oil. Zen, Barlow and Gondowarsito (2006) studied that the crude oil prices have an influence on the palm oil as pointed out by Ahuja and Khamba (2008). It has been proved that there is an influence of biodiesel on the production of palm oil. The research result on the biodiesel and its impact on crude palm oil and its implications for palm oil, showed that the growing number of biodiesel has a positive and significant effect towards crude oil palm as well as the implications for the production of palm oil rises (Ashayeri, 2007). The increase of demand and the use of palm oil as a fuel is expected to cause disruption of the availability of CPO as raw materials for food, especially palm oil (Chand and Shirvani, 2000; Enkawa and Schvaneveldt, 2001). Novelty of this research is to add the existing variables into world oil price of the biodiesel and its impact on crude palm oil and its effect on oil palm. 2. Theory and Hypothesis As Santoso (2014) has pointed out bio-diesel is a natural renewable energy source that made from biomass or vegetable oil. As the bio-diesel has physical properties very similar to petroleum derived diesel fuel or ADO (Automobile Diesel Oil), bio-diesel has been used for motor engine since 1880's. In 1920's, bio-diesel production infrastructure has been nearly eliminated since diesel engine manufacturers altered their engine to utilize petroleum diesel that was much cheaper than Bio-diesel production. Recently, an increase on oil consumption, crude oil price, and ADO import have lead to consider bio-diesel utilization for transportation sector in Indonesia. An increase of the crude oil price that lead to a decreasing cost differential for bio-diesel production, bio-diesel utilization as alternative energy source in Indonesia is a real possibility. Some environmental impact concerns would also increase the bio-diesel utilization prospect. Oil palm is a highly profitable crop adapted to the humid tropics and the area devoted to this crop is likely to expand significantly in the future. It has many environmentally favourable attributes over its full life cycle. …

PENGARUH PENGGUNAAN AIR VENT TUBE TURBULANCE (AVTT) TERHADAP KINERJA MESIN MOTOR MATIK 4 LANGKAH

Automatic motor engine 4 stroke system uses a carburetor engine is still less than optimal performance. To overcome these problems it created tools that the air intake tube Turbulent Air Vent Tube (AVTT). AVTT is a tool that serves to improve the quality of air intake into the cylinder motor fuel, by changing the air flow laminar to turbulent flow so that the fuel combustion process is ideal close to perfect. AVTT tube designed using aluminum material types AVTT in 6069. Installation of the air filter duct size is adjusted to the motor air filter diameter hole. To determine the performance of a motorcycle engine can be made by automatic test engine performance using a dynamometer. Tests conducted to analyze the effect of the use of AVTT on engine performance includes the automatic motor torque, data, air fuel ratio and fuel consumption. The test results showed that the use AVTT able to increase the torque of 0.06 - 13.74%, power from 0.08 - 13.74%, and the air fuel ratio of 18: 1 - 10: 1, and can reduce fuel consumption 2 - 9 % in both engine variants automatic motor 4 stroke.

Use of CFD to predict trapped gas excitation as source of vibration and noise in screw compressors

This paper investigates the source of noise in oil free screw compressors mounted on highway trucks and driven by a power take-off (PTO) transmission system. Trapped gas at the discharge side is suggested as possible source of the excitation of low frequency torsional resonance in these compressors that can lead to noise and vibration. Measurements and lumped mass torsional models have shown low frequency torsional resonance in the drive train of these compressors when they are mounted on trucks. This results in high torque peak at the compressor input shaft and in part to pulsating noise inside the machine. The severity of the torque peak depends on the amplitude of the input torque fluctuation from the drive (electric motor or truck engine). This in turn depends on the prop-shaft angle. However, the source of the excitation of this low torsional resonance inside the machine is unknown. Using CFD with mesh motion at every 1° rotation of the rotors, it is shown that the absence of a pressure equalizing chamber at the discharge can lead to trapped gas creation, which can lead to over-compression, over-heating of the rotors, and to high pressure pulsations at the discharge. Over-compression can lead to shock wave generation at the discharge plenum and the pulsation in pressure can lead to noise generation. In addition, if the frequency of the pressure pulsation in the low frequency range coincides with the first torsional frequency of the drive train the first torsional resonance mode can be excited.

Dynamic measuring of performance parameters for vehicles engines

Paper deals with dynamic measurement of performance parameters for selected vehicles engines using incremental sensor attached to the rest bed roller. Data collection was performed with an eight-channel collector. The moment of the inertia is the result of the measurement, which can also be used in the measurement of performance parameters. The external speed characteristics of the engine primarily resulting from the dynamic measurement is the absolute result of the measurement. It can be concluded on the technical conditions of the motor vehicle based on the evaluation of external speed characteristics of the engine. It is possible to maintain consistently good technical state of the motor engine with an appropriate maintenance and contribute to the ecology and the economy of the vehicle operation.