Estimation for Variation of the Damping Force Induced by the Expansive Movement of Shock Absorber

2013 ◽  
Vol 694-697 ◽  
pp. 312-315
Author(s):  
Gi Man Kim ◽  
Seong Ho Yun ◽  
Seong Dae Choi
Keyword(s):  
Empirical Data ◽  
Shock Absorber ◽  
Coil Spring ◽  
Damping Force ◽  
Piston Velocity ◽  
Physical Information ◽  
Force Variation ◽  
Piston Valve ◽  
The Relationship ◽  
Manufacturing Time

In this paper, the damping force loci of a twin tube shock absorber were estimated by using the empirical data. The variation of the damping force was investigated for movements of piston such as the expansion. The relationship between the piston velocity and the damping force were estimated by using the empirical data of four different conditions of coil spring turns. Also the relationship between the coil spring turns and the damping force were estimated by using the empirical data of four different piston velocities. Based on the experiment results, the estimated damping force variation functions provide the physical information of the components of the main piston valve system to save the manufacturing time and cost for the shock absorber

Design and Damping Force Analysis for Turbine Composite Regenerative Damper

2012 ◽  
Vol 446-449 ◽  
pp. 1360-1365
Author(s):  
Yong Qiang Gao ◽  
Jin Qiu Zhang ◽  
Jie Yue ◽  
Zhi Zhao Peng
Keyword(s):  
Basic Principle ◽  
Electromotive Force ◽  
Load Resistance ◽  
Force Analysis ◽  
Damping Force ◽  
Piston Velocity ◽  
Axial Turbine ◽  
New Type ◽  
The Relationship

Turbine composite regenerative damper is one of new type damper which can regenerate the energy of vibration. The component and principle of generator and regenerate energy for turbine composite regenerative damper is introduce, and based on hydrodynamics and axial turbine basic principle, the relationship between induced electromotive force and piston velocity ,load resistance is induced. At last, the relationship between damping force and piston velocity, load resistance is induced too. The method is meaningful to understand and instruct the design of turbine composite regenerative damper.

Thermo-Fluid Analysis and Testing of a Pneumatic Port Cleaner

1995 ◽  
Vol 117 (1) ◽  
pp. 28-32
Author(s):  
N. Khatri ◽  
F. Gerner ◽  
B. Ziels ◽  
T. Moskal
Keyword(s):  
Fluid Model ◽  
Piston Velocity ◽  
Orifice Area ◽  
Supply Pressure ◽  
Fluid Analysis ◽  
Valve Assembly ◽  
Cylinder Piston ◽  
Piston Valve ◽  
The Relationship ◽  
Exit Orifice

This paper details a thermo-fluid model of the cylinder-piston-valve assembly of a pneumatic rodding boiler port cleaner. The relationship among the governing parameters is established. Model-predicted results are presented graphically and compared with experimental curves to verify the validity of the model. Small exit orifice areas offer a better cushioning effect. Numerical simulations show that the piston velocity increases with supply pressure and the weight of the piston, decreases with orifice area and is independent of the inclination angle of the device.

Design of Automobile Shock Absorber Based on Throttle Type Adjustable Damping

2014 ◽  
Vol 1079-1080 ◽  
pp. 954-957
Author(s):  
Yang Ming
Keyword(s):  
Traffic Safety ◽  
Shock Absorber ◽  
Industrial Sector ◽  
Poor Correlation ◽  
Damping Force ◽  
Automotive Manufacturing ◽  
Damping Effect ◽  
Curve Smoothing ◽  
Favorable Conditions ◽  
The Relationship

With the deepening of reform in the industrial sector, automotive manufacturing technology has been greatly improved. Suspension damping effect of the traditional shortcomings of poor correlation analysis suspension constituted by employees, starting from the improved shock absorber damping valve, designed and developed Nepal adjustable shock absorber set, in order to improve traffic safety and create favorable conditions. This damper is in the computing speed and power, the analysis of the relationship between the motor and the throttle on the invention came. Practice has proved that through adjustable automobile shock absorber damping curve smoothing, deformation is not obvious, the stepper motor rotation into correspondence with the damping force, with better value.

scholarly journals A Concentric Design of a Bypass Magnetorheological Fluid Damper with a Serpentine Flux Valve

Actuators ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 16 ◽  
Author(s):  
Muhammad Hafiz Idris ◽  
Fitrian Imaduddin ◽  
Ubaidillah ◽  
Saiful Amri Mazlan ◽  
Seung-Bok Choi
Keyword(s):  
Dynamic Range ◽  
Fluid Pressure ◽  
Dynamic Test ◽  
Mr Damper ◽  
Test Machine ◽  
Damping Force ◽  
Piston Velocity ◽  
Design Structure ◽  
Damper Design ◽  
Piston Valve

This work presents a new concentric design structure of a bypass magnetorheological (MR) damper with a serpentine flux valve type. In this design, the serpentine valve is installed not in the middle of the piston but on the bypass channel of the damper. However, to make it less bulky, the location of the valve installation is chosen to be in line with the cylinder axis, which is different from the common configuration of the bypass damper. With the proposed design concept, the performance flexibility of the bypass configuration and the compactness of the piston valve configuration can be accomplished. In this study, these benefits were demonstrated by firstly deriving an analytical model of the proposed MR damper focusing on the bypass concentric valve structure, which is vital in determining the damping force characteristics. The prototype of MR damper was also fabricated and characterized using the dynamic test machine. The simulation results show that the damping force could be adjusted from 20 N in the off-state to around 600 N in the on-state with 0.3 A of excitation current. In the experiments, during low piston velocity measurement, the on-state results from the simulation were generally in good agreement with the experimental results. However, with the increase in piston velocity, the deviation between the simulation and the experiment gets higher. The deviations are most probably due to seal frictions that were not accounted for in the model. The seal friction is probably dominant as the seals in the prototype need to be prepared for handling higher fluid pressure. As a result, the frictions are quite prevalent and significantly affect the measured off-state damping forces as well, where it was recorded ten times higher than the predicted values from the model. Nevertheless, although there were deviations, the dynamic range of the concentric bypass structure is still 1.5 times higher than the conventional structure and the new structure can be potentially explored more to achieve an improved MR damper design.

Possible examinations of stone machining focused on the relationship between technological parameters and surface quality

2013 ◽  
Vol 4 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Zs. Kun ◽  
I. G. Gyurika
Keyword(s):  
Surface Roughness ◽  
Metal Cutting ◽  
Cutting Speed ◽  
Theoretical Background ◽  
Motion Path ◽  
Depth Of Cut ◽  
Manufacturing Cost ◽  
Technological Parameters ◽  
The Relationship ◽  
Manufacturing Time

Abstract The stone products with different sizes, geometries and materials — like machine tool's bench, measuring machine's board or sculptures, floor tiles — can be produced automatically while the manufacturing engineer uses objective function similar to metal cutting. This function can minimise the manufacturing time or the manufacturing cost, in other cases it can maximise of the tool's life. To use several functions, manufacturing engineers need an overall theoretical background knowledge, which can give useful information about the choosing of technological parameters (e.g. feed rate, depth of cut, or cutting speed), the choosing of applicable tools or especially the choosing of the optimum motion path. A similarly important customer's requirement is the appropriate surface roughness of the machined (cut, sawn or milled) stone product. This paper's first part is about a five-month-long literature review, which summarizes in short the studies (researches and results) considered the most important by the authors. These works are about the investigation of the surface roughness of stone products in stone machining. In the second part of this paper the authors try to determine research possibilities and trends, which can help to specify the relation between the surface roughness and technological parameters. Most of the suggestions of this paper are about stone milling, which is the least investigated machining method in the world.

The Non-Causal Character of Renormalization Group Explanations

2018 ◽  
Author(s):  
Margaret Morrison
Keyword(s):  
Probability Theory ◽  
Renormalization Group ◽  
Dynamical Systems ◽  
Recent Literature ◽  
Mathematical Explanation ◽  
Causal Status ◽  
Physical Information ◽  
The Relationship ◽  
Structural Aspects

After reviewing some of the recent literature on non-causal and mathematical explanation, this chapter develops an argument as to why renormalization group (RG) methods should be seen as providing non-causal, yet physical, information about certain kinds of systems/phenomena. The argument centres on the structural character of RG explanations and the relationship between RG and probability theory. These features are crucial for the claim that the non-causal status of RG explanations involves something different from simply ignoring or “averaging over” microphysical details—the kind of explanations common to statistical mechanics. The chapter concludes with a discussion of the role of RG in treating dynamical systems and how that role exemplifies the structural aspects of RG explanations which in turn exemplifies the non-causal features.

scholarly journals How does the position of firms in the supply chain affect their performance? An empirical study

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Siddharth Arora ◽  
Alexandra Brintrup
Keyword(s):  
Supply Chain ◽  
Empirical Data ◽  
Large Scale ◽  
Individual Performance ◽  
Supply Network ◽  
Supply Chain Networks ◽  
Focal Firm ◽  
Cooperative Competition ◽  
Large Scale Networks ◽  
The Relationship

AbstractThe relationship between a firm and its supply chain has been well studied, however, the association between the position of firms in complex supply chain networks and their performance has not been adequately investigated. This is primarily due to insufficient availability of empirical data on large-scale networks. To addresses this gap in the literature, we investigate the relationship between embeddedness patterns of individual firms in a supply network and their performance using empirical data from the automotive industry. In this study, we devise three measures that characterize the embeddedness of individual firms in a supply network. These are namely: centrality, tier position, and triads. Our findings caution us that centrality impacts individual performance through a diminishing returns relationship. The second measure, tier position, allows us to investigate the concept of tiers in supply networks because we find that as networks emerge, the boundaries between tiers become unclear. Performance of suppliers degrade as they move away from the focal firm (i.e., Toyota). The final measure, triads, investigates the effect of buying and selling to firms that supply the same customer, portraying the level of competition and cooperation in a supplier’s network. We find that increased coopetition (i.e., cooperative competition) is a performance enhancer, however, excessive complexity resulting from being involved in both upstream and downstream coopetition results in diminishing performance. These original insights help understand the drivers of firm performance from a network perspective and provide a basis for further research.

scholarly journals Taming the Tiger: Voting Rights and Political Instability in Latin America

2004 ◽  
Vol 46 (2) ◽  
pp. 29-58 ◽  
Author(s):  
Josep M. Colomer
Keyword(s):  
Latin America ◽  
Latin American ◽  
Empirical Data ◽  
Formal Model ◽  
Political Instability ◽  
Voting Rights ◽  
Historical Survey ◽  
Electoral Rules ◽  
The Relationship ◽  
Different Levels

AbstractThis article discusses the relationship between certain institutional regulations of voting rights and elections, different levels of electoral participation, and the degree of political instability in several Latin American political experiences. A formal model specifies the hypotheses that sudden enlargements of the electorate may provoke high levels of political instability, especially under plurality and other restrictive electoral rules, while gradual enlargements of the electorate may prevent much electoral and political innovation and help stability. Empirical data illustrate these hypotheses. A historical survey identifies different patterns of political instability and stability in different countries and periods, which can be compared with the adoption of different voting rights regulations and electoral rules either encouraging or depressing turnout.

Inequality Overhang: A Heterogeneous Approach

2019 ◽  
pp. 106-133
Author(s):  
Francesco Grigoli ◽  
Adrian Robles
Keyword(s):  
Economic Development ◽  
Income Inequality ◽  
Shock Absorber ◽  
Negative Impact ◽  
Empirical Literature ◽  
Debt Overhang ◽  
Positive Side ◽  
Low Levels ◽  
The Relationship ◽  
Income Concentration

The linearity of the relationship between income inequality and economic development has been long questioned. While theory provides arguments for which the shape of the relationship may be positive for low levels of inequality and negative for high ones, most of the empirical literature assumes a linear specification finding conflicting results. Employing an innovative empirical approach, robust to endogeneity, we find pervasive evidence of nonlinearities. In particular, similar to the debt-overhang literature, we identify an inequality-overhang level, in that the slope of the relationship between income inequality and economic development switches from positive to negative at a net Gini coefficient of about 27 per cent. We also find that in an environment characterized by widespread financial inclusion and high income concentration, rising income inequality has a larger negative impact on economic development because banks may curtail credit to customers at the lower end of the income distribution. On the positive side, a sufficiently high female labor participation can act as a shock absorber reducing such a negative impact, possibly through a more efficient allocation of resources.

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