scholarly journals PROSPECTIVE ELECTROMECHANICAL SHOCK ABSORBERS

2021 ◽  
Vol 1 (38) ◽  
pp. 133-140
Author(s):  
A. Ozulu ◽  
B. Lyubarsky
Keyword(s):  
Permanent Magnets ◽  
Shock Absorber ◽  
Body Tilt ◽  
Rolling Stock ◽  
Comparative Characteristic ◽  
Linear Motors ◽  
Suspension Systems ◽  
Shock Absorbers ◽  
Functional Scheme ◽  
Electric Train

The article considers the issue of the system of the running gear of a high-speed electric train with a body inclination and the system of oscillation recovery. The authors considered the main suspension systems of the electric train body, which are currently used. The main problems of these suspension systems were put forward. Attention is paid to the use of air-spring suspension. The pipe suspension of the VL80 electric locomotive and the construction of the trolley itself are considered. The basic criteria of an estimation of efficiency of perspective electromechanical shock-absorbers on which the comparative characteristic is carried out are defined. The article describes a promising electromechanical shock absorber based on a synchronous linear motor, which can provide both body tilt and damping and recovery of oscillations. The functional scheme of control of two synchronous linear motors which are established on one cart is considered. The operation of the control system of synchronous linear motors is described. The design of a linear DC motor with permanent magnets is described. The functional control scheme of two linear DC motors with permanent magnets is considered. The design of the electromechanical shock-absorber of the Bose company is resulted. The comparative characteristic of three perspective electromechanical shock-absorbers on six criteria is carried out. Conclusions are made and an electromechanical shock absorber is selected, which provides the basic needs of rolling stock.

On-Field Measurements of the Dissipated Vibrational Power of an SUV Car Traditional Viscous Shock Absorber

2018 ◽  
Author(s):  
Mohamed A. A. Abdelkareem ◽  
Lin Xu ◽  
Mohamed Kamal Ahmed Ali ◽  
Mohamed A. Hassan ◽  
Ahmed Elagouz ◽  
...  
Keyword(s):  
Shock Absorber ◽  
Average Power ◽  
Field Measurements ◽  
Velocity Range ◽  
Suspension Systems ◽  
Shock Absorbers ◽  
Road Section ◽  
Speed Range ◽  
System Body ◽  
Acceleration Signals

The current paper provides some on-field measurements regarding the quantification of the dissipated power during the damping process of a traditional viscous shock absorber. In this regard, the HAVAL H8 SUV was driven for several trips on the Nanhu campus arena considering a velocity range of 20–50 km/h. Furthermore, two species of campus road sections were selected during the fabricated tests; straight road section with and without a speed bump. The acceleration signals of the rear-right suspension system (body and wheel) were acquired as the average power dissipation trend could be calculated from the relative suspension velocity. The findings of this investigation indicate that the average dissipated power of a traditional shock absorber can be in a range of 10–90 W for a speed range of 20–50 km/h driving on a campus road section free of speed bumps. Whilst, for another road segment with one speed bump, the shock absorber dissipated a kinetic energy between 40–140 W for a velocity range of 20–50 km/h. Suggesting that an average overall dissipated power of 160–560 W is available by means of the traditional shock absorbers. The results are of strategic interest for the researchers and vehicle manufacturers for further considerations in terms of regenerative suspension systems where a part of this energy could be harvested instead of being wholly dissipated.

Energy Harvesting Potential Comparison Study of a Novel Railway Vehicle Bogie System With the Hydraulic-Electromagnetic Energy-Regenerative Shock Absorber

2017 ◽  
Author(s):  
Jia Mi ◽  
Lin Xu ◽  
Sijing Guo ◽  
Lingshuai Meng ◽  
Mohamed A. A. Abdelkareem
Keyword(s):  
Energy Harvesting ◽  
Shock Absorber ◽  
Vibrational Energy ◽  
Suspension System ◽  
Railway Vehicle ◽  
Hydraulic Motor ◽  
Suspension Systems ◽  
Shock Absorbers ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency

With the development of high-speed rail technology, the interaction between wheel and track becomes more serious, which threatens the running stability, riding quality and safety of the vehicle. Due to the selected stiffness and damping parameters, conventional passive suspensions cannot fit in with the diverse conditions of the railway. Additionally, among these vibrations contains a large amount of energy, if this vibrational energy can be recycled and used for the active suspension to control, it will be a good solution compared to the conventional passive suspensions. Many energy-harvesting shock absorbers have been proposed in recent years, the most popular design is the electromagnetic harvester including linear electromagnetic shock absorbers, rotational electromagnetic shock absorbers, the mechanical motion rectifier (MMR), and the hydraulic electromagnetic energy-regenerative shock absorber (HESA). With different energy converting mechanisms, the complicated effects of the inertia and nonlinear damping behaviors will severely impact the vehicle dynamic performance such as the ride comfort and road handling. In the past few years, engineers and researchers have done relevant researches on HESA which have shown that it has good effects and proposed several suspension energy regeneration solutions for applying to car. This paper presents a novel application of HESA into a bogie system for railway vehicles comparing to the conventional suspension systems. HESA is composed of hydraulic cylinder, check valves, accumulators, hydraulic motor, generator, pipelines and so on. In HESA, the high-pressure oil which is produced by shock absorber reciprocation could be exported to drive the hydraulic motor, so as to drive the generator to generate electricity. In this way, HESA regenerate the mechanical vibrational energy that is otherwise dissipated by the traditional shock absorber as heat energy. Because the bogie has two sets of suspension systems, a dynamic model of bogie based on AMESim is established in order to clarify the influence of the dynamic characteristics effect and the energy harvesting efficiency when installing the HESA into different sets of the bogie. Then, set the HESA model into each suspension system of the bogie and input with the corresponding characteristic excitation, the influence of the dynamic characteristics and the energy harvesting efficiency are analyzed and compared. The simulation results show that the system can effectively reduce the vibration of the carriage, while maintaining good potential to recycle vibratory energy. Based on the results of the simulation, the relationships as well as differences between the first suspension system and second suspension system have been concluded, which are useful for the design of HESA-Bogie. Moreover, comparing the energy harvesting efficiency discrepancy between the two suspension systems, the potential of energy harvesting of a novel railway vehicle bogie system with HESA has been evaluated and then the best application department has been found, which indicates the theoretical feasibilities of the HESA-bogie to improve the fuel economy.

scholarly journals Neodymium Magnetic Shock Absorber for Two Wheelers Automobiles

2019 ◽  
Vol 8 (9S2) ◽  
pp. 660-662
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnets ◽  
Shock Absorber ◽  
Research Work ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Maintenance Cost ◽  
Damping Force ◽  
Suspension Systems ◽  
Magnetic Suspension System

This paper presents a research work on magnetic suspension system of two wheelers Automobiles, which are usually depending on spring type, Hydraulic and Pneumatic suspension systems. In this proposed magnetic suspension system, two permanent magnets made of Neodymium material are placed inside the shock absorber cylinder such that both facing same pole. So they produce a repulsive magnetic flux force, when they come closer due to shocking load. This repulsive magnetic flux force is used as shock absorbing media and provides damping force. Proposed suspension system proves to be more efficient over other type of suspension systems, absorb more number of shocks with high accuracy, has no leakage problem unlike in Hydraulic and Pneumatic system. So all these beneficial qualities make the magnetic suspension system to work efficiently with less maintenance cost and hence the Automobile.

About the possibility of women work in train driver and train driver assistant profession

2020 ◽  
Vol 60 (11) ◽  
pp. 778-781
Author(s):  
Anna A. Zakrevskaya ◽  
Ekaterina V. Dmitrieva
Keyword(s):  
Professional Growth ◽  
Online Survey ◽  
Psychological Climate ◽  
Rolling Stock ◽  
Equal Rights ◽  
Mixed Composition ◽  
Labor Legislation ◽  
Railway Industry ◽  
Train Driver ◽  
Electric Train

Introduction. The article presents the results of a survey of employees of the railway industry and volunteers of various professions on their attitude to the possibility of employment of women as a locomotive driver and assistant driver. The aim of study is to determine the socio-psychological aspects of allowing women to work as a driver and assistant driver of an electric train among employees of various professions, including in the railway industry. Materials and methods. Anonymous online survey conducted among 112 people: 60 women aged 29.9±7.9 years (from 19 to 55 years), and 52 men aged 29.6±8.4 years (from 15 to 53 years). Results. There is an ambiguous attitude to the prospects of allowing women to work as a driver and assistant driver of an electric train. The most urgent problems of an organizational nature that accompany changes in labor legislation are noted: the abolition of allowances "for harm", the increase in the retirement age, inconveniences in holiday homes that are currently designed exclusively for men. There are also positive prospects for these changes: the possibility of healthy professional competition and the emergence of new areas of professional growth for women, as well as increasing the prestige of OAS "Russian Railways" by creating an image of a company that provides candidates with equal rights regardless of gender. Conclusions. The appearance (although it would be more accurate to say "return") of women to work as drivers and assistant drivers is not a forced measure, as it was in wartime, but the result of the modernization of rolling stock and railway infrastructure, bringing to the fore the assessment of professionally important operator qualities, regardless of the gender of candidates. However, gender characteristics cannot be ignored in the socio-psychological context - for example, when recruiting locomotive crews with mixed composition or when creating a favorable psychological climate in a locomotive depot.

Mathematical modeling of elastoplastic deformation of tubular energy-absorbing elements under static and impact loading

2020 ◽  
pp. 78-82
Author(s):  
A.Р. Evdokimov ◽  
A.N. Gromyiko ◽  
A.A. Mironov
Keyword(s):  
Mathematical Modeling ◽  
Impact Loading ◽  
Elastoplastic Deformation ◽  
Shock Absorber ◽  
Analytical Models ◽  
Dynamic Impact ◽  
Shock Absorbers ◽  
Energy Absorbing ◽  
Absorbing Elements

Analytical models of static and dynamic impact elastoplastic deformation of tubular energy-absorbing elements constituting a tubular plastic shock absorber are proposed. The developed models can be used for the calculation and design of these shock absorbers. Keywords static and dynamic elastoplastic deformation, mathematical modeling, tubular energy-absorbing element, tubular plastic shock absorber, impact loading. [email protected]

scholarly journals Application of an Additive Manufactured Hybrid Metal/Composite Shock Absorber Panel to a Military Seat Ejection System

2021 ◽  
Vol 11 (14) ◽  
pp. 6473
Author(s):  
Valerio Acanfora ◽  
Chiara Corvino ◽  
Salvatore Saputo ◽  
Andrea Sellitto ◽  
Aniello Riccio
Keyword(s):  
Numerical Simulation ◽  
Additive Manufacturing ◽  
Total Mass ◽  
Shock Absorber ◽  
Metal Composite ◽  
Plastic Deformations ◽  
Shock Absorbers ◽  
Numerical Assessment ◽  
Lattice Core ◽  
Ejection Phase

In this work, a preliminary numerical assessment on the application of an additive manufactured hybrid metal/composite shock absorber panels to a military seat ejection system, has been carried out. The innovative character of the shock absorber concept investigated is that the absorbing system has a thickness of only 6 mm and is composed of a pyramid-shaped lattice core that, due to its small size, can only be achieved by additive manufacturing. The mechanical behaviour of these shock absorber panels has been examined by measuring their ability to absorb and dissipate the energy generated during the ejection phase into plastic deformations, thus reducing the loads acting on pilots. In this paper the effectiveness of a system composed of five hybrid shock absorbers, with very thin thickness in order to be easily integrated between the seat and the aircraft floor, has been numerically studied by assessing their ability to absorb the energy generated during the primary ejection phase. To accomplish this, a numerical simulation of the explosion has been performed and the energy absorbed by the shock-absorbing mechanism has been assessed. The performed analysis demonstrated that the panels can absorb more than 60% of the energy generated during the explosion event while increasing the total mass of the pilot-seat system by just 0.8%.

Double Adjustable Shock Absorbers Utilizing Electrorheological and Magnetorheological Fluids

2000 ◽  
Author(s):  
Jason E. Lindler ◽  
Norman M. Wereley
Keyword(s):  
Shock Absorber ◽  
Force Measurements ◽  
Damping Force ◽  
University Of Maryland ◽  
Shock Absorbers ◽  
Piston Head ◽  
Performance Requirements ◽  
Velocity Response ◽  
The University ◽  
Yield Force

Abstract Double adjustable shock absorbers allow for independent adjustment of the yield force and post-yield damping in the force versus velocity response. To emulate the performance of a conventional double adjustable shock absorber, an electrorheological (ER) and magnetorheological (MR) automotive shock absorber were designed and fabricated at the University of Maryland. For the ER shock absorber, an applied electric field between two tubular electrodes, located in the piston head, increases the force required for a given piston rod velocity. For the MR shock absorber, an applied magnetic field between the core and flux return increases the force required for a given piston rod velocity. For each shock absorber, two different shaped gaps meet the controllable performance requirements of a double adjustable shock absorber. A uniform gap allows for control of the yield force of the shock absorber, while a non-uniform gap allows for control of the post-yield damping. Force measurements from sinusoidal displacement cycles, recorded on a mechanical damper dynamometer, validate the performance of uniform and non-uniform gaps for adjustment of the yield force and post-yield damping, respectively.

Modelling the Dynamic Behaviour of A Motorcycle Damper

1995 ◽  
Vol 209 (4) ◽  
pp. 249-262 ◽  
Author(s):  
A L Audenino ◽  
G Belingardi
Keyword(s):  
Shock Absorber ◽  
Dynamic Behaviour ◽  
Fluid Dynamic ◽  
Critical Factor ◽  
Physical Models ◽  
Vehicle Suspension ◽  
Shock Absorbers ◽  
Internal Fluid ◽  
Output Force ◽  
Dependent Behaviour

Within the context of vehicle suspension component characterization, that of shock absorbers is one of the more difficult to achieve, yet it is a very critical factor in the prediction of vehicle dynamic behaviour. Strongly non-linear output force functions are always linked to a frequency-dependent behaviour. Using the internal fluid-dynamic phenomenon with respect to a motorcycle shock absorber, different physical models of increasing complexity are presented: using these models it is possible to evaluate the importance of different factors, for example oil compressibility or oil inertia. Comparisons with experimental data confirm the validity of these models

Electromagnetic Shock Absorbers for Automotive Suspensions: Electromechanical Design

2006 ◽  
Author(s):  
Nicola Amati ◽  
Aldo Canova ◽  
Fabio Cavalli ◽  
Stefano Carabelli ◽  
Andrea Festini ◽  
...  
Keyword(s):  
Shock Absorber ◽  
Dynamic Performance ◽  
Integrated Design ◽  
Design Procedure ◽  
Resistive Load ◽  
Added Resistance ◽  
Damping Force ◽  
Quarter Car Model ◽  
Car Model ◽  
Shock Absorbers

This article illustrates the modeling and design of electromechanical shock absorbers for automotive applications. Relative to the commonly used hydraulic shock absorbers, electromechanical ones are based on the use of linear or rotative electric motors. If electric motor is of the DC-brushless type, the shock absorber can be devised by shunting its electric terminals with a resistive load. The damping force can be modified by acting on the added resistance. An integrated design procedure of the electrical and mechanical parameters is presented in the article. The dynamic performance that can be obtained by a vehicle with electromechanical dampers is verified on a quarter car model.

scholarly journals HIGH-SPEED ROLLING STOCK OF UKRAINE

2021 ◽  
pp. 32-42
Author(s):  
О.М. Safronov ◽  
Keyword(s):  
High Speed ◽  
Brake System ◽  
Rolling Stock ◽  
Joint Stock Company ◽  
The European Union ◽  
Stock Company ◽  
Passenger Traffic ◽  
Technical Requirements ◽  
The World ◽  
Electric Train

A brief history of the development of high-speed passenger traffic in the countries of the world is shown, it is shown that the length of high-speed highways (SMM) in the world is 44 thousand km. Despite the fact that Ukraine is not included in the list of 28 countries with the SMM, a two-system electric train ECR1 "Tarpan" was created on the basis of the PUBLIC JOINT STOCK COMPANY "KRYUKOVSKY RAILWAY CAR BUILDING WORKS" (PJSC "KVBZ") for the speed of movement of more than 200 km / h. A description of the electric train and the peculiarities of the brake system are given. It is shown that the brake system corresponds to world counterparts for high-speed trains about what evidence test results, which, due to the lack of ATS, were carried out for a speed of 160 km / h. The results of the settlement research, using the mathematical model and the results of the driving brake tests, showed that the braking pathway of the electric train at a speed of 200 km / h is 1539 m, and at a speed of 300 km / h - 3172 m. The obtained brake path values comply with the technical requirements of the European Union TSI . Studies confirm that Ukraine has high-speed rolling stock for speeds up to 300 km / h. Key words: high-speed rolling stock, electric train, brake system, brake path, speed

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