Computer simulation and experimental investigations of noise levels and spectra for railway transport

2011 ◽  
Vol 45 (5) ◽  
pp. 293-300 ◽  
Author(s):  
A. E. Baranovskii
Keyword(s):  
Computer Simulation ◽  
Experimental Investigations ◽  
Railway Transport ◽  
Noise Levels

A Computer Simulation Approach for Engineering Air-Jet Spun Yarns

1997 ◽  
Vol 67 (3) ◽  
pp. 223-230 ◽  
Author(s):  
Rangaswamy Rajamanickam ◽  
Steven M. Hansen ◽  
Sundaresan Jayaraman
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Fiber Length ◽  
Experimental Investigations ◽  
Simulation Approach ◽  
Air Jet ◽  
Fiber Fineness ◽  
Spun Yarns ◽  
Yarn Count ◽  
Wrap Angle

A computer simulation approach for engineering air-jet spun yarns is proposed, and the advantages of computer simulations over experimental investigations and stand-alone mathematical models are discussed. Interactions of the following factors in air-jet spun yarns are analyzed using computer simulations: yarn count and fiber fineness, fiber tenacity and fiber friction, fiber length and fiber friction, and number of wrapper fibers and wrap angle. Based on the results of these simulations, yarn engineering approaches to optimize strength are suggested.

EVALUATION OF DYNAMIC QUALITIES OF MOVEMENT OF RE-EQUIPPED HOPPER CARS OF PILS OF LONG-TERM OPERATION

2020 ◽  
pp. 33-42
Author(s):  
O. Fomin ◽  
S. Kara ◽  
P. Prokopenko ◽  
M. Gorbunov ◽  
V. Fomin
Keyword(s):  
Experimental Study ◽  
Computer Simulation ◽  
Computer Modeling ◽  
Technical Condition ◽  
Friction Damper ◽  
Railway Transport ◽  
Dynamic Tests ◽  
Term Operation ◽  
Roller Bearings

As part of the work, a theoretical and experimental study (based on running dynamic tests) of the running qualities of empty hopper cars, converted from cement trucks and mineral trucks, was conducted. Computer simulation of the dynamics of empty hopper wagons converted from cement and mineral wagons depending on the condition of the track, the technical condition of the wagons and the weight of the container, the repeated presence of maximum vertical deviations and horizontal deviations of the track. A significant disadvantage of the railway transport of Ukraine is the limitation of the speed of trains with individual freight cars in an empty state, which are equipped with carts model 18-100. Among the reasons for the descent of the wheels of cars from the rails are: malfunctions of the running gear of the cars (fracture of the side frames and spring beams of the carts, malfunctions of the roller bearings of the axle box), wear of friction damper elements, unacceptable deviations and upgrades. As part of the work, a theoretical and experimental study (based on running dynamic tests) of the running qualities of empty hopper cars, converted from cement trucks and mineral trucks, was conducted. Computer modeling of the dynamics of empty hopper wagons, converted from cement and mineral wagons depending on the condition of the track, the technical condition of the wagons and the weight of the container and studies of the dependence of the wheel stability on the east.

Investigation of Ways to Reduce Road Traffic Noise of Apartment Complexes Using Computer Simulation

2016 ◽  
Vol 851 ◽  
pp. 673-679
Author(s):  
Jun Oh Yeon ◽  
Kyoung Woo Kim ◽  
Kwan Seop Yang
Keyword(s):  
Computer Simulation ◽  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Noise Levels ◽  
The Road ◽  
Apartment Complex ◽  
Noise Barrier ◽  
Continuous Noise ◽  
Apartment Complexes

In the present study, computer simulations were carried out using Sound Plan in order to investigate whether road traffic noise levels in two apartment complexes were less than the outdoor noise criteria [65 dB(A)] The sound isolation tunnel was found to be most effective way for noise reduction in the two apartment complexes, although they each have different building arrangements and road traffic. A noise barrier with a height of more than 12 m was required to meet the outdoor noise criteria in apartment complex A. The continuous noise barrier with a height of more than 10 m and enough distance from the road traffic were required in apartment complex B.

Experimental investigations of the externally heated valve engine model

2001 ◽  
Vol 215 (4) ◽  
pp. 487-494 ◽  
Author(s):  
L Brzeski ◽  
Z Kazimierski
Keyword(s):  
Computer Simulation ◽  
Measurement System ◽  
External Source ◽  
Time Dependent ◽  
Experimental Investigations ◽  
Pressure Transducers ◽  
Engine Model ◽  
Experimental Stand ◽  
The Subject ◽  
Valve Engine

The experimental investigations of the first model of the externally heated valve engine carried out during 1998-9 are the subject of this paper. The working gas of the engine is air. A detailed description of the engine equipped with two consecutively working heaters is given. Two kinds of heaters were constructed and investigated. The experimental stand and the measurement system are described. In this first stage of the engine investigation, electric radiators were used as the external source of heat. The main aim of the experimental investigations was focused on measurements of time-dependent pressures inside the expander and compressor cylinders. The pressures were measured by means of two kinds of pressure transducers (piezoresistive and piezoelectric) to get confidence in the obtained results. The conducted investigations prove that The engine model has an operating ability. Comparisons of the experimental and theoretical pressures inside the expander and compressor show a satisfactory agreement. It confirms that the engine operates according to the original thermodynamical cycle and exhibits the internal power and efficiency predicted by the computer simulation. The experiences gained during these investigations have been used to modify the engine model, which is outlined in this paper.

Computer Simulation of Diesel Fueled Engine Processes Using MATLAB and Experimental Investigations on Research Engine

2017 ◽  
Author(s):  
Shankar Venkataraman ◽  
Reghu Ramawarrier ◽  
Vivek Kozhikkoottungal Satheesh ◽  
Nikhil Mathew Mundupalam ◽  
Siddaling Bhure
Keyword(s):  
Computer Simulation ◽  
Normal Load ◽  
Simulation Software ◽  
Load Test ◽  
Combustion Model ◽  
Experimental Investigations ◽  
Variable Load ◽  
Combustion Modeling ◽  
Simulation Speed ◽  
Smoke Opacity

The depletion of conventional fuel source at a fast rate and increasing environmental pollution have motivated extensive research in combustion modeling and energy efficient engine design. In the present work, a computer simulation incorporating progressive combustion model using thermodynamic equations has been carried out using MATLAB to evaluate the performance of a diesel engine. Simulations at constant speed and variable load have been carried out for the experimental engine available in the laboratory. For simulation, speed and Air/Fuel ratios, which are measured during the experiment, have been used as input apart from other geometrical details. A state-of-the-art experimental facility has been developed in-house. The facility comprises of a hundred horsepower water cooled eddy current dynamometer with appropriate electronic controllers. A normal load test has been carried out and the required parameters were measured. A six gas analyzer was used for the measurement of NOx, HC, CO2, O2, CO and SOx. and a smoke meter was used for smoke opacity. The predicted Pressure-Volume (PV) diagram was compared with measurements and found to match closely. It is concluded that the developed simulation software could be used to get quick results for parametric studies.

scholarly journals Numerical–Experimental Analysis of Polyethylene Pipe Deformation at Different Load Values

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 160
Author(s):  
Adam Gnatowski ◽  
Agnieszka Kijo-Kleczkowska ◽  
Mateusz Chyra ◽  
Dariusz Kwiatkowski
Keyword(s):  
Computer Simulation ◽  
Numerical Analysis ◽  
Experimental Analysis ◽  
External Load ◽  
Experimental Studies ◽  
Strain Gauges ◽  
Experimental Investigations ◽  
Polyethylene Pipe ◽  
External Forces ◽  
The Impact

Polymer pipes are used in the construction of underground gas, water, and sewage networks. During exploitation, various external forces work on the pipeline, which cause its deformation. In the paper, numerical analysis and experimental investigations of polyethylene pipe deformation at different external load values (500, 1000, 1500, and 2000 N) were performed. The authors measured strains of the lower and upper surface of the pipe during its loading moment using resistance strain gauges, which were located on the pipe at equal intervals. The results obtained from computer simulation and experimental studies were comparable. An innovative element of the research presented in the article is recognition of the impact of the proposed values of the load of polyethylene pipe on the change in its deformation.

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