scholarly journals Study the Formation of Vibration Signs in the Axial Direction on the Standard Running Wheels of the Overhead Crane Truck

2020 ◽  
Vol 153 (6) ◽  
pp. 100-106
Author(s):  
N. M. Fidrovska ◽  
◽  
Ye. D. Slepuzhnikov ◽  
Keyword(s):  
Axial Direction ◽  
Overhead Crane ◽  
Running Wheels

scholarly journals EXPERIMENTALSTUDY OF DYNAMIC EFFORTS DURING THE OPERATION OF THE MECHANISM OF MOVEMENT OF THE CARGO TROLLEYOF AN OVERHEAD CRANE

2021 ◽  
pp. 60-69
Author(s):  
Nataliia Fidrovska ◽  
Evgen Slepuzhnikov ◽  
Roman Ponomarenko ◽  
Dmytro Kozodoi
Keyword(s):  
Friction Pair ◽  
Evaluation Criteria ◽  
Rolling Friction ◽  
Technical Condition ◽  
Overhead Crane ◽  
Rail Track ◽  
Stage Of Development ◽  
Rolling Surface ◽  
Running Wheels ◽  
Shock Pulses

The article deals with the determination of the dynamic loads arising in the running wheels of a conventional (standard) and modernized design during the movement of the cargo carriage of an overhead crane. The redesigned wheel has an insert made from 7-7130 rubber compound. Also, a method for diagnosing running wheels of conventional and modernized design was determined. The ZETLAB program was chosen as a program for signal registration and analysis. This program allows not only displaying the signal in real time with the possibility of scaling, but also allows you to digitize the signal with the possibility of further processing the results in various standards. Finding out the occurrence of a defect in wheels and rails is mainly carried out by two methods, when shock pulses appear and according to an increased background of vibration. In practice, there is a process of "dry" rolling friction, and this means that the method of shock pulses for diagnosing the condition of wheels and a rail track can be used only in some cases in the form of extreme wear of the friction pairs of a wheel and a rail. That is, the method of spectral analysis of fluctuations in the power of random vibration can be successfully applied to diagnose the state of the rail track and crane wheel.  The diagnostic method based on the overall vibration level allows for an overall assessment of the technical condition. Such diagnostics makes it possible to identify defects only at the very last stage of development, when they lead or have already led to partial destruction of the rolling surface of the wheel and the surface of the rail, that is, to an increase in the overall level of vibration. The performance evaluation criteria are fully focused on the corresponding standard vibration levels for the investigated friction pair. A friction pair is considered to be defective, the vibration of which exceeds the general standard. When determining an increased overall level of vibration, maintenance personnel must make a decision to replace parts or a unit to prolong its operation. The results obtained indicate the advisability of using the wheels of the modernized design on the cargo carriage of an overhead crane.

scholarly journals Determining stresses in the metallic structure of an overhead crane when using running wheels of the new design

2021 ◽  
Vol 1 (7 (109)) ◽  
pp. 22-31
Author(s):  
Nataliia Fidrovska ◽  
Evgen Slepuzhnikov ◽  
Ivan Varchenko ◽  
Serhii Harbuz ◽  
Serhii Shevchenko ◽  
...  
Keyword(s):  
Bridge Circuit ◽  
Original Position ◽  
Overhead Crane ◽  
Metallic Structure ◽  
Far Right ◽  
Elastic Rubber ◽  
Running Wheels ◽  
Oscillation Damping ◽  
Deformation Diagrams ◽  
Period Of Oscillation

This paper proposes a method to experimentally study the stressed state of the metallic structure of an overhead crane when using running wheels of different designs. The study employed a functioning electric, supporting, double-girder overhead crane with a capacity of 5 tons and a run of 22.5 m. Strain gauges assembled in a semi-bridge circuit and connected to the analog-digital converter Zetlab210 (Russia) were used to determine the girder deformations at the time of hoisting and moving cargoes of different masses. The cargo was lifted and displaced under the same conditions, on the regular wheels of a cargo trolley and the wheels with an elastic rubber insert. The girder deformation diagrams were constructed. The subsequent recalculation produced the stressed state's dependences at each point of cargo movement when using both regular wheels and the wheels with an elastic rubber insert. Also established were the dependences and the duration of oscillations that occur over the cycle of cargo lifting and moving. The experimental study cycle included cargo lifting in the far-left position by a trolley, moving the cargo to the far-right position, and returning the trolley with the cargo to its original position. It should be noted that the application of a new, modernized design of the running wheels of a cargo trolley with an elastic rubber insert effectively dampen the oscillations in the metallic structure of the crane. The experimental study's results helped establish an 18 % reduction in stresses in the girder of the overhead crane, as well as a decrease in peak vibrations, by 20 seconds, at the same cycles of cargo hoisting and moving. In addition, using wheels with an elastic rubber insert reduces the period of oscillation damping at the end of the cycle of cargo movement, by at least 30 %.

Enhancement of Heat Transfer in a Short Rectangular Channel with Substantial Deflection of Inlet Velocity from Axial Direction

2005 ◽  
Vol 36 (4) ◽  
pp. 311-318 ◽  
Author(s):  
R. Bunker ◽  
M. YA. Belen'kii ◽  
M. A. Gotovskii ◽  
B. S. Fokin ◽  
S. A. Isaev
Keyword(s):  
Heat Transfer ◽  
Rectangular Channel ◽  
Axial Direction ◽  
Enhancement Of Heat Transfer ◽  
Inlet Velocity

Analysis and resolvent for skew traveling of the overhead crane cart phenomenon

2015 ◽  
Author(s):  
Weihui Wang ◽  
Suquan Chao ◽  
Yunping Wei ◽  
Bigen Yang ◽  
Hui Zhao
Keyword(s):  
Overhead Crane

Determination of the Average Energy of Iron Ions in the Axial Direction of a Micropinch Discharge Using an Ion Collector

2019 ◽  
Vol 82 (10) ◽  
pp. 1387-1391
Author(s):  
S. A. Sarantsev ◽  
I. F. Raevskii ◽  
V. A. Kostyushin ◽  
A. S. Savelov
Keyword(s):  
Average Energy ◽  
Axial Direction ◽  
Iron Ions

Analysis of Vibration Caused by Electromagnetic Force on Stator End-Winding of Large Dry Submersible Motor

2013 ◽  
Vol 416-417 ◽  
pp. 428-432
Author(s):  
Li Shan ◽  
Xiao Wei Cheng ◽  
Yong Fang ◽  
Xiao Hua Bao
Keyword(s):  
Electromagnetic Field ◽  
Steady State ◽  
Transition State ◽  
Electromagnetic Force ◽  
Radial Displacement ◽  
Radial Direction ◽  
Axial Direction ◽  
Axial Displacement ◽  
Force Density ◽  
Submersible Motor

This paper investigates the vibration which caused by electromagnetic on the stator end-winding of the large dry submersible motor. Firstly, the electromagnetic field which included transition state and steady state is researched by 3-D FEM. Secondly, the electromagnetic force which lead to vibrations of end-winding is calculated by numerical method, it can be obtained that where endured the largest force density along the slant part of end-winding. Finally, the radial displacement and the axial displacement of the slant part which caused by vibrations is studied, the analysis results show that the axial displacement is larger than the amplitude of radial displacement. It indicates that the slant part of end-winding will be more easily damaged at axial direction than radial direction.

scholarly journals Random pore structure and REV scale flow analysis of engine particulate filter based on LBM

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 881-896
Author(s):  
Chunrui Wu ◽  
Tiechen Zhang ◽  
Jiale Fu ◽  
Xiaori Liu ◽  
Boxiong Shen
Keyword(s):  
Single Channel ◽  
Flow Analysis ◽  
Flow Characteristics ◽  
Axial Direction ◽  
Particulate Filter ◽  
Random Structure ◽  
Structure Generation ◽  
Inlet Flow ◽  
Random Structures ◽  
Boltzmann Method

Abstract In this article, lattice Boltzmann method (LBM) is used to simulate the multi-scale flow characteristics of the engine particulate filter at the pore scale and the representative elementary volume (REV) scale, respectively. Four kinds of random wall-pore structures are considered, which are circular random structure, square random structure, isotropic quartet structure generation set (QSGS), and anisotropic QSGS, with difference analysis done. In terms of the REV scale, the influence of different inlet flow velocities and wall permeabilities on the flow in single channel is analyzed. The result indicates that the internal seepage laws of random structures constructed in this article and single channel are in accordance with Darcy’s law. Circular random structure has better permeability than square random structure. Isotropic QSGS has better fluidity than anisotropic one. The flow in single channel is similar to Poiseuille flow. The flow lines in the channel are complicated and a large number of vortices appear at the ends of channel with high inlet flow rate. With the increase of inlet velocity, the static pressure in channel gradually increases along the axial direction as well as the seepage velocity. The temperature field in the channel becomes more uniform as the flow velocity increases, and the higher temperature distribution appears on the wall of the porous media.

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