scholarly journals OPTIMALISASI TEKANAN SHOCK ABSORBER DAN TEKANAN PEGAS COIL TERHADAP GETARAN MOBIL

2020 ◽  
Vol 3 (01) ◽  
pp. 5-10
Author(s):  
Listiyono Yono Listiyono ◽  
Nurhadi Nurhadi ◽  
Agus Hardjito
Keyword(s):  
Safety Factor ◽  
Shock Absorber ◽  
Vibration Reduction ◽  
Experimental Methods ◽  
Gas Pressure ◽  
Steering Wheel ◽  
Coil Spring ◽  
Two Factors ◽  
Bouncing Effect

Safety and comfort are the valuable factor for the driver. One of the safety factor refers to the steering accuracy. Steering wheel hardness must be soft when turning but remain stable in straight track. The comfort factor refers to the bouncing effect when the car passing in rough track. Those two factors is depend on the shock absorber components. This study aims to know the optimum gas pressure and spring pressure to obtain the maximum vibration reduction. This study use the experimental methods use the 6 bar, 8 bar, and 10 bar of absorber pressure. The spring pressure used in this study is 20 , 25  dan 30 (Kg/cm2). The data obtained were analyzed with MINITAB software. From the results of research on Optimizing Shock Absorber Pressure and Coil Spring Pressure Against Car Vibrations can be concluded as follows: 1. There is an influence of absorber pressure and spring pressure on the suspension on the amount of vehicle vibration. The optimum absorber pressure is 10 (bar). 2. The optimum coil spring pressure at 24 (kg / cm2).

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

scholarly journals X-ray Analysis in the Low Vacuum SEM (Part 3 of 3)

1998 ◽  
Vol 6 (10) ◽  
pp. 10-13
Author(s):  
Don Chernoff
Keyword(s):  
Electron Beam ◽  
Path Length ◽  
Experimental Methods ◽  
Gas Pressure ◽  
Operating Conditions ◽  
X Rays ◽  
X Ray ◽  
Software Models ◽  
Working Distance ◽  
Low Vacuum Sem

In this third and final installment on x-ray analysis in the environmental and low vacuum SEM, I will present experimental methods for measuring beam scatter. In my previous two articles I discussed how operating conditions detemine beam scatter. It was shown that the type of gas used, the gas pressure in the chamber, the working distance or beam gas path length, and the accelerating voltage all have an effect on how much the electron beam scatters. I also discussed how the beam scatter influences x-ray results by producing x-rays beyond the area of the primary beam. Furthermore, I showed how software models could be used to determine the amount of beam scatter based on different combinations of the four variables (pressure, gas, working distance, and kV).

Rotational Energy Harvesting Systems for Unpowered Freight Rail Cars

2010 ◽  
Author(s):  
C. Nagode ◽  
M. Ahmadian ◽  
S. Taheri
Keyword(s):  
Energy Harvesting ◽  
Shock Absorber ◽  
Electronic Devices ◽  
Electric Energy ◽  
Rotational Energy ◽  
Coil Spring ◽  
Design Development ◽  
Harvesting Systems ◽  
Electromagnetic Energy Harvesting ◽  
Railroad Applications

Commonly, freight cars have no available source of electric power, thus preventing the use of any electronic devices that could improve convenience, performance, and efficiency of railroad operations. The devices introduced in this paper are motion-based electromagnetic energy harvesting systems. Similar in size and shape to a conventional damper or shock absorber, the systems are to be placed in the coil spring of the suspension to convert part of the energy usually wasted as heat into useful electric energy. This paper will present the design, development and testing of such devices. Tests of prototype devices on a shock dynamometer show that more than 20 Watts RMS of power can be produced with motions that can be encountered in train suspensions. The devices presented, although primarily developed for railroad applications, are not limited to use in freight cars and could be similarly applied in various vehicles with suspension like tractor-trailers, buses or automobiles.

Investigation of a Vibration Reduction System for Vehicle Seats by a Vibration Model Consisting of a Vehicle, Seat, and Human Body

2013 ◽  
Author(s):  
S. Ota ◽  
S. Nishiyama ◽  
T. Nakamori
Keyword(s):  
Mechanical Properties ◽  
Human Body ◽  
Vibration Reduction ◽  
Steering Wheel ◽  
The Road ◽  
Reduction System ◽  
Vibration Model ◽  
Comparison Results ◽  
Vertical Vibrations ◽  
Calculation System

This paper describes a vibration reduction system that can minimize the vertical vibrations of the human body in a vehicle. This system can control the mechanical properties of the seat cushions, such as the spring constants and damping coefficients. To examine the feasibility of this vibration reduction system, we design a vibration model of both an occupant–seat–steering wheel–pedals–vehicle system and a calculation system. Further, we carry out a numerical analysis to calculate the magnitude of vibrations transmitted from the road surface to the human body based on ISO7096-EM6. Comparison results of the frequency response between the analysis and the experiment indicate the feasibilities of both the vibration model and the analysis method. Furthermore, vibration of the head was reduced 60.1% by controlling the mechanical properties of the seat from 1/5 to 5 times. In summary, the in-vehicle vibration reduction system successfully reduces vibrations from the seat to the human body.

Bandgap enhancement of periodic nonuniform metamaterial beams with inertial amplification mechanisms

2020 ◽  
Vol 26 (15-16) ◽  
pp. 1309-1318 ◽  
Author(s):  
Shoaib Muhammad ◽  
Shuai Wang ◽  
Fengming Li ◽  
Chuanzeng Zhang
Keyword(s):  
Cross Sections ◽  
Vibration Reduction ◽  
Flexural Vibration ◽  
Experimental Methods ◽  
Numerical Results ◽  
Variable Cross ◽  
Bragg Scattering ◽  
Elastic Beams ◽  
Lower Frequencies

The aim of this study was to obtain bandgaps that are much better, that is at lower frequencies and in broader frequency ranges. Novel nonuniform metamaterial beams with periodically variable cross sections and inertial amplification mechanisms are designed and investigated by numerical and experimental methods. Flexural vibration equations of the nonuniform metamaterial beams are established, and the enhanced bandgap and vibration reduction properties are achieved by combining Bragg scattering and the inertial amplification mechanisms. Numerical results of the bandgaps for the periodic elastic beams with and without the inertial amplification mechanisms are validated by comparing them with the results of vibration experiments. Effects of the amplification mass and angle on the bandgap properties are investigated. Larger amplification mass and angle lead to much enhanced bandgap performances of the nonuniform metamaterial beams in lower to higher frequency ranges.

The Investigation and Analysis of the Use of Rail Fastening in Shanghai

2010 ◽  
Vol 163-167 ◽  
pp. 2641-2646
Author(s):  
Rong Shi ◽  
Yue Lei He
Keyword(s):  
Shock Absorber ◽  
Vibration Reduction ◽  
Type Ii ◽  
Development Research ◽  
Safe Operation ◽  
Wide Range ◽  
Actual Use ◽  
And Performance ◽  
Shanghai Metro ◽  
Selection Of

In this paper, rail fastening of shanghai metro line1,2,3,4, the species distribution from a variety of fasteners and fastening performance comparisons of the two main aspects of the investigation. To mastered the main content of the use of Shanghai Metro rail fastening. Analysis of the popular types fastener of Shanghai subway such as type WJ-2 fastener, type DTIII fastener, type DTIII-2 fastener, type II elastic fastener. Track fastener in the actual use of shock absorber characteristics of the process. Come to Shanghai Metro rail fastening design and selection of line with actual needs, Shanghai Metro rail fastening series featured a wide variety and distinctive. Also pointed out that lack of adjustable fasteners, fastener corrosion, fastener and the lack of vibration reduction and performance degradation caused by a wide range of management and maintenance of complex and emphasize on the use of investigation and analysis of search problems, tracking the course of the development, research the causes and improve the conservation measures to maintain rail fastening methods Keti the safe operation of the subway has a crucial role in.

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