scholarly journals UNDERCARRIAGE UPDATING OF DIESEL LOCOMOTIVE TE 109

2020 ◽  
Vol 2020 (1) ◽  
pp. 28-33
Author(s):  
Evgeniy Slivinskiy ◽  
Sergey Radin
Keyword(s):  
Design Parameters ◽  
Hydraulic Shock ◽  
Efficient Design ◽  
Diesel Locomotive ◽  
Industrial Companies ◽  
Shock Absorbers ◽  
Cylindrical Spiral

In the design of modern diesel locomotives equipped with three-axial bogies both in our country and abroad there is widely used a spring hanger made as cylindrical spiral springs of compression with the use of hydraulic shock absorbers. At that the boxes of wheel pairs are connected with frames with the aid of carriers. A considerable drawback of such bogies is that these designs do not allow obtaining the angular turn of wheel pairs during their motion along curvilinear areas of a railway. That is why in practice an increased wear of wheel flanges of wheel pairs takes place. In Bunin SU of Yelets at the level of the invention (RU2604924) there is developed a promising design of a spring hanger excluding such a drawback and a series of computations for substantiation of its efficient design parameters. The investigation results are recommended by research and industrial companies in the field of heavy engineering both in our country, and abroad with the purpose of the further study of the design developed and its possible introduction in practice.

scholarly journals Methodology for substantiating the design parameters of a single-tube hydropneumatic shock absorber

2020 ◽  
Vol 17 (4) ◽  
pp. 166-173
Author(s):  
A. M. Voytko ◽  
Keyword(s):  
Comparative Analysis ◽  
Energy Intensity ◽  
Shock Absorber ◽  
Design Parameters ◽  
Working Fluid ◽  
Hydraulic Shock ◽  
Single Tube ◽  
Operating Modes ◽  
Shock Absorbers ◽  
Selection Of

The article describes the developed methodology for calculating the parameters of a single-tube hydropneumatic shock absorber. The calculation procedure is presented including calculating the volume of the gas filling cavity, calculating the parameters of the gas and the working fluid, determining the energy intensity of the shock absorber, checking the possibility of cavitation in the operating modes, as well as calculating the strength of the shock absorber parts.. A comparative analysis results of the calculated characteristics and the experimental characteristics of the hydropneumatic shock absorber are presented, the absorber having been produced according to the obtained design parameters. Based on the analysis, recommendations are given to increase the running smoothness of the car by replacing the standard hydraulic shock absorbers with hydropneumatic ones, taking into account the selection of the throughput of the discharge valves.

scholarly journals BIM Enabled Approach for Performance-Based Design

2018 ◽  
Vol 7 (4) ◽  
pp. 1-27
Author(s):  
Renas K.M. Sherko ◽  
Yusuf Arayici ◽  
Mike Kagioglou
Keyword(s):  
Technology Use ◽  
Building Design ◽  
Energy Performance ◽  
Performance Based Design ◽  
Design Parameters ◽  
Performance Parameters ◽  
Efficient Design ◽  
Architectural Practice ◽  
Study Approach ◽  
And Performance

A significant amount of energy is consumed by buildings due to ineffective design decisions with little consideration for energy efficiency. Yet, performance parameters should be considered during the early design phase, which is vital for improved energy performance and lower CO2 emissions. BIM, as a new way of working methodology, can help for performance-based design. However, it is still infancy in architectural practice about how BIM can be used to develop energy efficient design. Thus, the aim is to propose a strategic framework to guide architects about how to do performance-based design considering the local values and energy performance parameters. The research adopts a multi case study approach to gain qualitative and quantitative insights into the building energy performance considering the building design parameters. The outcome is a new design approach and protocol to assist designers to successfully use BIM for design optimization, PV technology use in design, rules-based design and performance assessment scheme reflecting local values.

Sensitivity enhancement of a folded beam MEMS capacitive accelerometer-based microphone for fully implantable hearing application

2018 ◽  
Vol 63 (6) ◽  
pp. 699-708 ◽  
Author(s):  
Apoorva Dwivedi ◽  
Gargi Khanna
Keyword(s):  
Microelectromechanical Systems ◽  
Bone Structure ◽  
Design Parameters ◽  
Comsol Multiphysics ◽  
Geometrical Parameters ◽  
Efficient Design ◽  
Capacitive Accelerometer ◽  
Biomedical Device ◽  
Device Geometry ◽  
The Stability

Abstract The present work attempts to enhance the sensitivity of a folded beam microelectromechanical systems (MEMS) capacitive accelerometer by optimising the device geometry. The accelerometer is intended to serve as a microphone in the fully implantable hearing application which can be surgically implanted in the middle ear bone structure. For the efficient design of the accelerometer as a fully implantable biomedical device, the design parameters such as size, weight and resonant frequency have been considered. The geometrical parameters are varied to obtain the optimum sensitivity considering the design constraints and the stability of the structure. The optimised design is simulated and verified using COMSOL MULTIPHYSICS 4.2. The stability of the device is ensured using eigenfrequency analysis. Optimised results of the device geometry are presented and discussed. The accelerometer has a sensing area of 1 mm2 and attains a nominal capacitance of 5.3 pF and an optimum sensitivity of 6.89 fF.

High-frequency Characterization of Hydraulic Shock Absorbers

ATZ worldwide ◽  
2019 ◽  
Vol 121 (3) ◽  
pp. 76-80
Author(s):  
Sebastian Rieß ◽  
Jan Hansmann ◽  
William Kaal ◽  
Sven Herold
Keyword(s):  
High Frequency ◽  
Hydraulic Shock ◽  
Shock Absorbers

Design-airworthiness integration method for general aviation aircraft during early development stage

2019 ◽  
Vol 91 (7) ◽  
pp. 1067-1076
Author(s):  
Maxim Tyan ◽  
Jungwon Yoon ◽  
Nhu Van Nguyen ◽  
Jae-Woo Lee ◽  
Sangho Kim
Keyword(s):  
Design Optimization ◽  
Design Stage ◽  
Design Parameters ◽  
Design Framework ◽  
Efficient Design ◽  
Content Type ◽  
Early Design ◽  
Early Design Stage ◽  
Optimization Framework ◽  
Design Requirements

Purpose Major changes of an aircraft configuration are conducted during the early design stage. It is important to include the airworthiness regulations at this stage while there is extensive freedom for designing. The purpose of this paper is to introduce an efficient design framework that integrates airworthiness guidelines and documentation at the early design stage. Design/methodology/approach A new design and optimization process is proposed that logically includes the airworthiness regulations as design parameters and constraints by constructing a certification database. The design framework comprises requirements analysis, preliminary sizing, conceptual design synthesis and loads analysis. A design certification relation table (DCRT) describes the legal regulations in terms of parameters and values suitable for use in design optimization. Findings The developed framework has been validated and demonstrated for the design of a Federal Aviation Regulations (FAR) 23 four-seater small aircraft. The validation results show an acceptable level of accuracy to be applied during the early design stage. The total mass minimization problem has been successfully solved while satisfying all the design requirements and certification constraints specified in the DCRT. Moreover, successful compliance with FAR 23 subpart C is demonstrated. The proposed method is a useful tool for design optimization and compliance verifications during the early stages of aircraft development. Practical implications The new certification database proposed in this research makes it simpler for engineers to access a large amount of legal documentation related to airworthiness regulations and provides a link between the regulation text and actual design parameters and their bounds. Originality/value The proposed design optimization framework integrates the certification database that is built of several types of legal documents such as regulations, advisory circulars and standards. The Engineering Requirements and Guide summarizes all the documents and design requirements into a single document. The DCRT is created as a summary table that indicates the design parameters affected by a given regulation(s), the design stage at which the parameter can be evaluated and its value bounds. The introduction of the certification database into the design optimization framework significantly reduces the engineer’s load related for airworthiness regulations.

The Effects of Fluid and Mechanical Compliance on the Performance of Hydraulic Shock Absorbers

1974 ◽  
Vol 96 (1) ◽  
pp. 101-106 ◽  
Author(s):  
R. W. Mayne
Keyword(s):  
Differential Equations ◽  
Shock Absorber ◽  
Rigid Wall ◽  
Hydraulic Shock ◽  
Orifice Area ◽  
Shock Absorbers ◽  
Constant Area ◽  
Mechanical Compliance ◽  
Hydraulic Shock Absorber ◽  
The Ideal

Dimensionless differential equations are developed which model a hydraulic shock absorber. These equations are solved numerically to determine quantitatively the effects of fluid compressibility and series and parallel springs on the shock absorber operation. Both variable and constant orifice area are considered for a system protecting a mass during impact against a rigid wall. The results show that a finely tuned variable area shock absorber is degraded by the considered forms of compliance. Performance of the constant area shock absorber can be improved by including compliance and, with an appropriate parallel spring, the ideal flat deceleration profile can be obtained without variable orifice area.

Nonnatural vibrations of hydraulic shock-absorbers

2008 ◽  
Vol 81 (6) ◽  
pp. 1191-1196
Author(s):  
N. A. Dokukova ◽  
P. N. Konon ◽  
E. N. Kaftaikina
Keyword(s):  
Hydraulic Shock ◽  
Shock Absorbers

Design of Thick Composite Cylinders

1988 ◽  
Vol 110 (3) ◽  
pp. 255-262 ◽  
Author(s):  
A. K. Roy ◽  
S. W. Tsai
Keyword(s):  
Design Method ◽  
Pressure Vessels ◽  
Design Parameters ◽  
Efficient Design ◽  
3 Dimensional ◽  
Layer Sequence ◽  
External Pressures ◽  
Final Design ◽  
Use Efficiency ◽  
Composite Cylinders

A simple and efficient design method for thick composite cylinders is presented. Micromechanics and macromechanics are integrated by simple relations and the integrated micro and macromechanics approach has been adopted to enable the designers to instantly study the sensitivity of the micromechanical variables on the final design. The stress analysis is based on 3-dimensional elasticity by considering the cylinder in the state of generalized plane strain. The analysis for both open-ended (pipes) and closed-ended (pressure vessels) cylinders subjected to internal and external pressures and axial load is presented. The failure of the cylinders is predicted by using a 3-dimensional quadratic failure criterion. A degradation model is used to calculate burst pressures and the calculated burst pressures agree very well with the available experimental results, for both thin and thick cylinders. In optimizing multilayer cylinders, the 3-D quadratic criterion enables one to obtain the optimal layer sequence very easily. It is found that the layer sequence is very critical in optimizing, in particular, thick cylinders. In addition, the design parameters and material use efficiency of multilayer closed cylinders subjected to internal pressure have also been studied.

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