Improving Seaplane Seakeeping through the Use of Amortized Floats

2015 ◽  
Author(s):  
Anton N. Varyukhin ◽  
Vladimir V. Veselov ◽  
Maxim A. Ovdienko ◽  
Alexandr V. Arilin ◽  
Sergey V. Dikiy
Keyword(s):  
Mathematical Model ◽  
Important Task ◽  
Series Of Experiments

Seaworthiness characteristics are one of the key conditions for the success of the seaplane. So the improvement of these characteristics is an important task. It was suggested that the using of amortized floats could improve the seaworthiness characteristics of seaplane. For this purpose series of experiments were carried out and mathematical model was developed.

scholarly journals MODELING AND PRODUCTIVITY PREDICTION OF THE COMPANIES-INTERNAL CROWDSOURCING-BASED IDEATION

2021 ◽  
Vol 1 ◽  
pp. 2147-2156
Author(s):  
Pavel Livotov
Keyword(s):  
Mathematical Model ◽  
Finite Number ◽  
Research Question ◽  
Performance Function ◽  
Non Linear ◽  
Series Of Experiments ◽  
Productivity Prediction ◽  
A Company

AbstractThe internal crowdsourcing-based ideation within a company can be defined as an involvement of its staff, specialists, managers, and other employees, to propose solution ideas for a pre-defined problem. This paper addresses a question, how many participants of the company-internal ideation process are required to nearly reach the ideation limit for the problems with a finite number of workable solutions. To answer the research question, the author proposes a set of metrics and a non-linear ideation performance function with a positive decreasing slope and ideation limit for the closed-ended problems. Three series of experiments helped to explore relationships between the metric attributes and resulted in a mathematical model which allows companies to predict the productivity metrics of their crowdsourcing ideation activities such as quantity of different ideas and ideation limit as a function of the number of contributors, their average personal creativity and ideation efficiency of a contributors’ group.

Interaction Between Two Closely Spaced Azimuthing Thrusters

1998 ◽  
Vol 42 (01) ◽  
pp. 15-32 ◽  
Author(s):  
Paul Brandner ◽  
Martin Renilson
Keyword(s):  
Mathematical Model ◽  
Satisfactory Agreement ◽  
Vehicle Dynamics ◽  
Operating Conditions ◽  
Towing Tank ◽  
Empirical Relations ◽  
Series Of Experiments ◽  
Flow Effects ◽  
Semi Empirical

To assist in predicting the performance of omni-directional propelled vehicles a series of experiments has been conducted to measure the interaction between two closely spaced ductedazimuthing thrusters. The thrusters were tested below a shallow draft ground board in a towing tank at a spacing of approximately 2 propeller diameters. Measurements were made of forces acting on a single thruster for a range of operating conditions and similarly on two thrusters for a range of relative positions. The results show that forces from the trailing thruster are heavily affected by interaction, particularly due to impingement of the race from the leading thruster, where as forces from the leading thruster remain essentially unaffected despite its proximity to the trailing thruster. A semi-empirical mathematical model suitable for simulation of omni-directional vehicle dynamics is presented. The model is based on the trajectory of the race from the leading thruster derived from momentum considerations with additional empirical relations to account for other more minor flow effects. Comparison of the predicted and measured results show satisfactory agreement.

Simulation of fuel bed ignition by wildland firebrands

2018 ◽  
Vol 27 (8) ◽  
pp. 550 ◽  
Author(s):  
O. V. Matvienko ◽  
D. P. Kasymov ◽  
A. I. Filkov ◽  
O. I. Daneyko ◽  
D. A. Gorbatov
Keyword(s):  
Mathematical Model ◽  
Pinus Sylvestris ◽  
Mathematical Modelling ◽  
Thermal Energy ◽  
Ignition Time ◽  
Pine Bark ◽  
Bark Sample ◽  
Airflow Velocity ◽  
Experimental Conditions ◽  
Series Of Experiments

A 3-D mathematical model of fuel bed (FB) ignition initiated by glowing firebrands originating during wildland fires is proposed. In order to test and verify the model, a series of experiments was conducted to determine the FB ignition time by a single pine bark and twig firebrand (Pinus sylvestris). Irrespective of the pine bark sample sizes and experimental conditions, the ignition of the FB was not observed. Conversely, pine twigs, under certain parameters, ignited the FB in the range of densities (60–105 kg m−3) and with the airflow velocity of ≥2 m s−1. The results of the mathematical modelling have shown that a single pine bark firebrand ≤5 cm long with a temperature of T ≤ 1073 K does not ignite in the flaming mode the FB, and only the thermal energy of larger particles is sufficient for flaming ignition of the adjacent layers of the FB. The analysis of the results has shown that the firebrand length is a major factor in the initiation of ignition. Comparison of the calculated and observed FB ignition times by a single firebrand have shown that our modelling accords well with the experimental results.

scholarly journals Planning of heat supply of territories: model and algorithms

2018 ◽  
Vol 39 ◽  
pp. 02001
Author(s):  
Ekaterina E. Mednikova
Keyword(s):  
Mathematical Model ◽  
Heat Supply ◽  
District Heating ◽  
Systems Development ◽  
Important Task ◽  
Heat Supply Systems ◽  
The Mathematical Model ◽  
Supply Systems

The choice of direction of heat supply systems development in cities is an important task for the authorities, district heating companies and consumers. The author focuses on two main problems in heat supply development questions: territory zoning by type of heat supply and determination of economically feasible heat supply systems sizes. For the solution of these problems, the mathematical model and algorithms were developed. For the solution of this task algorithms were developed.

Experimental Study on Double-Piston Gas Prover

2013 ◽  
Vol 457-458 ◽  
pp. 560-565
Author(s):  
Hui Yun Chen ◽  
Jia Cheng ◽  
Zhen Wei Huang ◽  
Wen Xin Shen
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Constant Speed ◽  
Piston Cylinder ◽  
Series Of Experiments

Existing piston gas provers use a single piston cylinder as standard which replace the standard flow of gas by the piston moving at a constant speed. In order to solve the problem that the piston proverflow ceiling is limited by the volume of piston cylinder, we have developed a double-piston gas prover. Firstly, the article introduces the devices principle and mathematical model simply. Then it presents a series of experiments and experiments results of the device. Finally,the paper analyzes the uncertainty of the equipment. The results show that the double-piston gas prover is available.

Predictions of ice-cover development in streams and its effect on dissolved oxygen modelling

1979 ◽  
Vol 6 (2) ◽  
pp. 197-207 ◽  
Author(s):  
E. McBean ◽  
G. Farquhar ◽  
N. Kouwen ◽  
O. Dubek
Keyword(s):  
Mathematical Model ◽  
Water Quality ◽  
Dissolved Oxygen ◽  
Prediction Model ◽  
Data Input ◽  
Quality Model ◽  
Two Stage ◽  
Second Stage ◽  
Series Of Experiments ◽  
Ice Edge

A two-stage mathematical model is developed for predicting dissolved oxygen levels in ice-covered rivers. The first stage of the model is a prediction model for ice-edge progression as a function of time, and the second stage consists of an extrapolation of a widely used 'summer condition' water-quality model. The results of a series of experiments, both field and laboratory-based, which served as data input generators and calibration testing of the model, are provided.Briefcase-study applications of elements of the model to the Speed River and to the Saint John River are included.

scholarly journals Development of a laboratory and experimental installation for checking the reliability of a mathematical model and an information and technical method for preventing emergencies at landfills of solid household waste with technological liquidation energy-intensive equipment

2021 ◽  
pp. 67-79
Author(s):  
Olena Azarenko ◽  
Volodymyr Mirnenko ◽  
Nina Rashkevich ◽  
Olga Shevchenko ◽  
Tatyana Shevchenko
Keyword(s):  
Mathematical Model ◽  
Physical State ◽  
Experimental Studies ◽  
Dynamic State ◽  
Household Waste ◽  
Tangential Load ◽  
Angle Of Internal Friction ◽  
Laboratory Setup ◽  
Stability Of Slopes ◽  
Series Of Experiments

The paper presents a developed laboratory setup that allows experimental studies of the influence of indicators of the physical state of landfill soil on the stability of slopes to shear, to check the reliability of the mathematical model and the information and technical method developed on its basis for preventing emergencies of the cascade type of propagation due to the displacement of landfill soil on a solid landfill household waste with technological liquidation energy-intensive equipment. The main elements of the developed installation are a rectangular experimental box with swivel and fixed parts, swivel and locking mechanisms, tabletop plates, a sprayer, and a tangential load system. As the main requirements for the installation, the possibility of conducting a series of experiments based on the use of landslide experimental blocks with a change in their humidity, density, temperature and angle of inclination of the base of the sliding surface, as well as mechanical characteristics - the angle of internal friction, specific adhesion of landfill soil. Carrying out research using a laboratory setup is based on the assumption that the transition of a landslide experimental block of landfill soil into a dynamic state is considered the onset of an emergency at the object level of distribution. In the course of the work, a technique was developed for conducting experimental studies and processing observation results. The methodology includes the following procedures: establishment of initial and boundary conditions; preparation of a laboratory installation; conducting a series of experiments to determine the mechanical parameters and the shear angle of the experimental blocks, and a series of experiments to determine the indicators of moisture, temperature and density of landfill soil on the fact of the shift, taking into account the gradual increase in moisture; statistical processing to obtain a statistical sample of the values of the effective indicators of the physical state of landfill soil included in the confidence interval according to the classical statistical method - Student's t-test.

scholarly journals Experience in modeling a comfortable environment in the transport compartment

2020 ◽  
Vol 157 ◽  
pp. 01019
Author(s):  
Vladimir Pankratov ◽  
Alexey Golikov ◽  
Elena Pankratova ◽  
Marina Barulina ◽  
Sofiya Galkina
Keyword(s):  
Mathematical Model ◽  
Operating Conditions ◽  
Temperature Fields ◽  
Thermal Processes ◽  
Passenger Compartment ◽  
The Public ◽  
Actual Operating ◽  
Specific Proposal ◽  
Series Of Experiments ◽  
The Mathematical Model

The theoretical base was developed and the mathematical model of dynamic thermal processes in a compartment of public transport was constructed. The software which is realized the constructed mathematical model was developed. The mathematical model provides for the possibility of taking into account the most possible environmental conditions which can have place in the actual operating conditions of a transport even the angle of illumination - the current temperature of the external environment, the presence of solar radiation taking into account the angle of sun’s illumination, and the temperature of the roadway. The software allows calculation and visualization non –stationary temperature fields in the public transport’s compartments using the example of a trolley bus. For a specific trolley bus design, a series of experiments to calculate the comfortable temperature for passengers were conducted, These experiments are showed the performance of the constructed model and allowed to formulate a specific proposal for improving the thermoregulation system of the trolleybus’ passenger compartment.

Influence of Variety of Oil Temperature on Performance of Hydro-Pneumatic Suspension

2010 ◽  
Vol 40-41 ◽  
pp. 705-710 ◽  
Author(s):  
Jue Yang ◽  
Jun Feng Zhao ◽  
Yan Hua Shen ◽  
Chen Yue Duan
Keyword(s):  
Mathematical Model ◽  
Room Temperature ◽  
Working Condition ◽  
Influence Of Temperature ◽  
System A ◽  
Test Platform ◽  
Pneumatic Suspension ◽  
Series Of Experiments ◽  
Set Up ◽  
Different Diameters

A test platform based on hydro-pneumatic suspension was set up to research the influence of temperature for the hydro-pneumatic suspension system. A series of experiments on damping holes of different diameters were carried out, and the temperature of oil and pressure on both sides of damping holes were recorded. A mathematical model of this platform was established using knowledge of fluid mechanics. The result of mathematical model was verified by experiments result, and the result is that oil temperature has little influence to working condition of suspension cylinder when it is between room temperature and 75°C.

Features of finishing of furniture fronts of MDF

10.12737/1764 ◽  
2013 ◽  
Vol 3 (3) ◽  
pp. 94-98
Author(s):  
Новоселова ◽  
Irina Novoselova
Keyword(s):  
Mathematical Model ◽  
Process Parameters ◽  
Technological Properties ◽  
Optimal Process ◽  
Process Flow ◽  
Special Effects ◽  
Series Of Experiments

In article questions of determining optimal process parameters of the operation composi-tion of Krakolet IF490 / 74 special effects, Italian company "Serlak", used in the production of hiding coatings on MDF. For this purpose a series of experiments was made of multifactorial planning in processing the results of which mathematical model was obtained allowing you accurately determine the progress of the process flow of decoration, depending on the technological properties of Krakolet, changing in the process of preparing its working composition.

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