scholarly journals METHOD FOR DETERMINING THE MECHANICAL DEVICE FOR PAIRING OF ROTATION FREQUENCIES VEHICLE WHEELS AND ASYNCHRONOUS GENERATOR SHAFT UNDER GUARANTEED EXCITATION

2021 ◽  
Vol 1 (53) ◽  
pp. 8-14
Author(s):  
Iu. Zachepa ◽  
◽  
O. Chornyi ◽  
N. Zachepa ◽  
O. Khrebtova ◽  
...  
Keyword(s):  
Gear Ratio ◽  
Power Supplies ◽  
General Criterion ◽  
Mechanical Device ◽  
Mechanical Coupling ◽  
Machine Type ◽  
Drive Motor ◽  
Asynchronous Generator ◽  
Range Of Variation ◽  
Selection Of

Purpose. Development of a method for calculating and selecting a mechanical device for coupling the speeds of the vehicle wheel and the shaft of an asynchronous generator under the condition of its guaranteed excitation. Methodology. The method of selection of transmission rollers of the mechanical device of conjugation of rotational frequencies is offered and the algorithm of its calculation is resulted. A method for determining the minimum allowable speed of the asynchronous generator shaft is proposed and the results of graphical and analytical solution for an asynchronous machine type AOL 21-4 are given. Result. The analytical dependence of the minimum allowable speed of the induction shaft as a function of the parameters of the drive motor of internal combustion, capacitive excitation and load, which must be provided by selecting the gear ratio of the mechanical coupling device. Originality. The general criterion for selecting the size of the transmission rollers is presented in the form of a quality functional, which takes into account the range of variation of the crankshaft speed of the primary engine, the range of variation of the diameter of the transmission roller and the range of fuel consumption at the corresponding crankshaft speed. Practical value. The proposed methods and the obtained research results allow to calculate and design devices for mechanical coupling of rotational frequencies of the shafts of the primary propulsion and asynchronous generator, which will expand the scope of the latter as part of local autonomous power supplies.

scholarly journals Efficient Gear Ratio Selection of a Single-Speed Drivetrain for Improved Electric Vehicle Energy Consumption

2020 ◽  
Vol 12 (21) ◽  
pp. 9254
Author(s):  
Polychronis Spanoudakis ◽  
Gerasimos Moschopoulos ◽  
Theodoros Stefanoulis ◽  
Nikolaos Sarantinoudis ◽  
Eftichios Papadokokolakis ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Electric Vehicle ◽  
Dynamic Model ◽  
Electric Vehicles ◽  
Gear Ratio ◽  
Test Bed ◽  
Time Data ◽  
Dynamic Simulations ◽  
Ratio Set ◽  
Selection Of

The electric vehicle (EV) market has grown over the last few years and even though electric vehicles do not currently possess a high market segment, it is projected that they will do so by 2030. Currently, the electric vehicle industry is looking to resolve the issue of vehicle range, using higher battery capacities and fast charging. Energy consumption is a key issue which heavily effects charging frequency and infrastructure and, therefore, the widespread use of EVs. Although several factors that influence energy consumption of EVs have been identified, a key technology that can make electric vehicles more energy efficient is drivetrain design and development. Based on electric motors’ high torque capabilities, single-speed transmissions are preferred on many light and urban vehicles. In the context of this paper, a prototype electric vehicle is used as a test bed to evaluate energy consumption related to different gear ratio usage on single-speed transmission. For this purpose, real-time data are recorded from experimental road tests and a dynamic model of the vehicle is created and fine-tuned using dedicated software. Dynamic simulations are performed to compare and evaluate different gear ratio set-ups, providing valuable insights into their effect on energy consumption. The correlation of experimental and simulation data is used for the validation of the dynamic model and the evaluation of the results towards the selection of the optimal gear ratio. Based on the aforementioned data, we provide useful information from numerous experimental and simulation results that can be used to evaluate gear ratio effects on electric vehicles’ energy consumption and, at the same time, help to formulate evolving concepts of smart grid and EV integration.

Assessment of the Robustness of Gas Turbine Diagnostics Tools Based on Neural Networks

2006 ◽  
Author(s):  
R. Bettocchi ◽  
M. Pinelli ◽  
P. R. Spina ◽  
M. Venturini ◽  
G. A. Zanetta
Keyword(s):  
Neural Networks ◽  
Gas Turbine ◽  
Measurement Errors ◽  
Health State ◽  
Artificial Intelligence Technique ◽  
Boundary Load ◽  
Set Up ◽  
Operating Points ◽  
Range Of Variation ◽  
Selection Of

The paper deals with the set-up and the application of an Artificial Intelligence technique based on Neural Networks (NNs) to gas turbine diagnostics, in order to evaluate its capabilities and its robustness. The data used for both training and testing the NNs were generated by means of a Cycle Program, calibrated on a Siemens V94.3A gas turbine. Such data are representative of operating points characterized by different boundary, load and health state conditions. The analyses carried out are aimed at the selection of the most appropriate NN structure for gas turbine diagnostics, by evaluating NN robustness with respect to: • interpolation capability and accuracy in the presence of data affected by measurement errors; • extrapolation capability in the presence of data lying outside the range of variation adopted for NN training; • accuracy in the presence of input data corrupted by bias errors; • accuracy when one input is not available. This situation is simulated by replacing the value of the unavailable input with its nominal value.

Design of power converters for induction heating applications taking advantage of wide-bandgap semiconductors

2017 ◽  
Vol 36 (2) ◽  
pp. 483-488 ◽  
Author(s):  
Oscar Lucia ◽  
Hector Sarnago ◽  
José M. Burdio
Keyword(s):  
Induction Heating ◽  
Wide Bandgap ◽  
Power Supplies ◽  
Disruptive Technology ◽  
Content Type ◽  
Heating Systems ◽  
Future Design ◽  
Bandgap Semiconductors ◽  
Heating Technology ◽  
Selection Of

Purpose Wide-bandgap (WBG) semiconductors have emerged as a disruptive technology in the power electronics sphere. This paper aims to analyse and discuss the importance for induction heating systems and gives some examples and highlights some future design trends and perspectives. Design/methodology/approach The benefits of WBG semiconductors are reviewed with a special emphasis on induction heating applications. Findings WBG devices enable the design of higher-performance induction heating power supplies. A significant selection of the reported converters is discussed, highlighting the benefits of this technology. Originality/value This paper highlights the benefits of WBG semiconductors and their potential to change and improve induction heating technology in the next years.

scholarly journals Novel Method for Selection of Drive Motor in Paperboard Forming Press Utilizing Multi-dynamics Model Based on Material Thickness

2017 ◽  
Vol 11 ◽  
pp. 2091-2098
Author(s):  
Sami Matthews ◽  
Panu Tanninen ◽  
Amir Toghyani ◽  
Harri Eskelinen ◽  
Sami-Seppo Ovaska ◽  
...  
Keyword(s):  
Dynamics Model ◽  
Model Based ◽  
Material Thickness ◽  
Drive Motor ◽  
Novel Method ◽  
Selection Of

scholarly journals Optimal Generation of Output Torque for Industrial Motors using Variable Frequency Drive and Gearbox Drive

2019 ◽  
Vol 8 (4) ◽  
pp. 12147-12153
Keyword(s):  
Gear Ratio ◽  
Vital Role ◽  
Variable Frequency ◽  
Load Range ◽  
Variable Frequency Drive ◽  
Output Torque ◽  
Continuous Output ◽  
Efficiency Losses ◽  
The Right ◽  
Selection Of

This paper depicts the exploration of output torque of Gear reduction drive and variable frequency drive (VFD) with detailed analysis report for the various load conditions. The right selection of VFD will depend on the load requirement and application. The higher the load therefore more torque needed in an application, the higher the current draw of the motor will be. Since VFDs are rated by their continuous output current (amps), it is important to select a drive with adequate current to the motor for optimal performance. The property of Torque is converse effect of gear reduction. By means of gear ratio, the output torque is increased by developing the torque with reduced efficiency losses. On the other hand, in some applications the gear reduction play a vital role in reduces the speed while increase the torque and in many other applications it uses to increase speed with reduced torque. In recent era, many industrial drives are designed as such that to run at 60% to 100% of rated load. In this scenario the drive would get optimum efficiency is generally obtained nearly 75% of rated load. Thus, a 20 horsepower (HP) electric drive has a satisfactory load range of 12 to 20 HP with optimum efficiency is at 7.5 HP. A motor’s efficiency tends to decrease dramatically below about 50% load. Hence it’s very important to choose the drive for the proper application with different loading conditions

scholarly journals On the Analytical Approach to the Selection of a Centroid in a Flat Gearing

2019 ◽  
pp. 40-50
Author(s):  
M.L. Ioffe
Keyword(s):  
Analytical Approach ◽  
Gear Ratio ◽  
Common Point ◽  
Constant Ratio ◽  
Insufficient Attention ◽  
Straight Line ◽  
Angular Velocities ◽  
The Common ◽  
Selection Of

The theory of gearing, and kinematics in particular, has a long history, in which the names of great mathematicians such as Euler, Huygens, Chebyshev are inscribed. This theory is described in detail in many works, yet insufficient attention is paid to the simply formulated, but difficult to solve problem of selecting equations of curves describing centroids in a flat gearing, in which motion is transmitted with a constant ratio of angular velocities. The existing methods for analyzing the flat gearing are based on the premise about the existence of a center of engagement, the point at which the velocities of the links are equal, and through which the common normal of the centroid passes, that is, on the Willis theorem. This work is based on the assertion that the projections of the velocities of the common point on the common normal are the same. The paper presents the derivation of equations that the equations of curves must satisfy in order to fulfil the condition of constancy of the angular velocities. In general, it is necessary that three unknown functions satisfy four constraints: both curves have a common point (two restrictions), the normals to the curves are parallel at this point, the projections of velocities of the common point on the normal are identical and determined by the angular velocities of the links. As an example, the most common forms of curves are considered: the involute, the epicycloid, and the hypocycloid. It is shown that for the involute all the constraints are satisfied, while the transmission of rotation with a constant gear ratio is impossible when using the epicycloid and the hypocycloid. A variant is considered where the form of only one curve is given, and the form of the second curve is calculated proceeding from the condition of constancy of the gear ratio. As an example, equations are derived where the hypocycloid and the straight line are chosen as the first curve.

Integrated Mechanism and Control Approach for Minimum Flexural Vibrations in Slewing Space Structures

1992 ◽  
Author(s):  
L. F. Yang ◽  
M. Chew ◽  
J. N. Juang
Keyword(s):  
Gear Ratio ◽  
Single Step ◽  
Space Structures ◽  
Flexible Beam ◽  
Solar Panels ◽  
Mechanical Device ◽  
Flexible Space Structures ◽  
Control Approach ◽  
Double Beam ◽  
Flexural Vibrations

Abstract An integrated single-step approach to the synthesis of a mechanical device and a controller is presented. The mechanical device consists of a noncircular gear pair that acts as a varying gear ratio transmission between an electro-mechanical actuator and a flexible structure. Such a system has been introduced as an application in minimizing flexura] vibrations in the slewing maneuver of flexible space structures such as large solar panels and satellites in space. Only a simple regulator-type feedback controller is called for to control this complex electro-mechanical-and-structural system and the purpose is to design this complex system in an integrated procedure to achieve low flexural vibrations of the structure. Simulations of the slewing control tasks for two different flexible space structures are presented: a single planar flexible beam; and a planar flexible articulated double-beam.

Viability of Litchi chinensis seeds when stored in air and in water

1985 ◽  
Vol 104 (1) ◽  
pp. 247-248 ◽  
Author(s):  
P. K. Ray ◽  
S. B. Sharma
Keyword(s):  
Genetic Variability ◽  
Mangifera Indica ◽  
Litchi Chinensis ◽  
The Past ◽  
Wide Range ◽  
The World ◽  
Range Of Variation ◽  
Selection Of

India is the second largest litchi producing country in the world after China (Syamal & Mishra, 1984), yet the number of litchi cultivars grown in the country is quite small compared with mango (Mangifera indica). In mango most of the choicest Indian cultivars have been obtained from chance seedlings (Singh, 1960) grown in the past without any definite aim in mind. Litchi, as a result of crosspollination (Chaturvedi, 1965), is a highly heterozygous fruit, and as such, its seedlings, like those of mango, exhibit a wide range of variation which helps in the selection of new desired types. It has, thus, been emphasized that litchi should be grown in bulk from seeds to introduce genetic variability (Kumar & Thakur, 1981). Kadman & Slor (1974), encouraged by excellent success in grafting, have also stressed the need for raising plants through seeds for rootstocks.

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