scholarly journals Analisis terjadinya hentakan dan suara keras pada suspensi belakang unit dump truck HD 785-7

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Hendro Purwono ◽  
Rasma Rasma ◽  
Riki Effendi
Keyword(s):  
High Speed ◽  
Vertical Vibration ◽  
The Body ◽  
Road Surface ◽  
Unit Weight ◽  
Dump Truck ◽  
Nitrogen Gas ◽  
The Road ◽  
Library Research ◽  
Using Data

The suspension system on the machine unit is very important to support the unit weight against the road surface and also protect the transmission from the vertical vibration of the wheels to the body of the unit. When the unit passes a damaged or bumpy road at high speed, shock loads from the road surface will be felt, so the role of the suspension is crucial in protecting components from damage, maintaining operator comfort and undamaged loads. HD 785-7 unit is one type of dump truck that uses cylindrical pneumatic hydro suspension that contains nitrogen and oil gases to absorb loads or vibrations from the road surface. In its operation which functions as a material carrier in the mine area, there are often problems with the suspension especially at the rear because it is holding a heavier load. Therefore, research needs to be carried out aimed at finding the main causes and solutions to these problems using data collection methods, namely: field surveys, interviews, and library research. The results show that damage to the valve core causes the valve to leak and cause the chamber at the top of the cylinder suspension to be occupied by nitrogen gas to be reduced so that the suspension suffers harsh strokes when operated especially on damaged roads. Damage to the valve core is caused by the use of non-standard and too tight tools in its installation. Keywords: hard suspension, valve core, feed valve, nitrogen gas, oil.

scholarly journals Investigation of the wear of asphalt concrete pavement taking into account the influence of temperature, moisture of the pavement and the presence of an aggressive environment

2021 ◽  
Vol 2 (92) ◽  
pp. 68
Author(s):  
Andrii Siedov ◽  
Olena Fomenko
Keyword(s):  
Asphalt Concrete ◽  
High Speed ◽  
Climatic Factors ◽  
Load Capacity ◽  
Weather Conditions ◽  
Road Surface ◽  
Winter Period ◽  
Influence Of Temperature ◽  
The Road ◽  
Industrial Enterprises

Abstract. The emergence of a large number of modern high-speed cars with improved dynamic characteristics and an increase in the share of cars, especially large load capacity, have significantly accelerated the destruction of asphalt roads. Plastic deformations, tracks and cracks are more and more often observed on asphalt concrete pavements of roads, their wear is accelerated. As a result, the transport and operational condition of roads deteriorates, the speed of traffic decreases, the cost of road transport increases, and increasing costs are required for road repairs. Thus, the conditions of traction of the wheels of the car with the road surface are influenced by the service life of the coating, traffic intensity, the amount of harmful emissions of industrial enterprises and climatic factors. At the same time uneven change of conditions of coupling in cross and longitudinal profiles of the highway comes to light. Analyzing the natural and climatic factors, we can establish that different weather conditions have different effects on the condition of the road surface. In summer, the condition of the surface is dry and clean, so the driving conditions are safe. Taking into account all the factors that lead to the destruction of the coating with the formation of residual deformations and irreversible changes, requires the study of wear of the coating surface. he wear of the coating largely depends on the friction force in the area of contact of the tire with the surface of the coating, the type of tires and the pressure in the tires. But the random nature of changes in the intensity and composition of traffic, seasons, temperature, humidity, rainfall affects the amount of wear over a period of operation of the road surface. The presence of water or solutions in the pores of the coating leads to the separation of mineral particles from the layer under the action of impact force from the wheels of vehicles. It is experimentally established that the wear of asphalt concrete in the dry and wet state increases with increasing temperature. One of the main types of damage to road surfaces is their premature wear under the influence of vehicle wheels, in combination with changing weather conditions. Analyzing the natural and climatic factors, we can establish that different weather conditions have different effects on the condition of the road surface. The article considers the influence of temperature, humidity and the presence of solutions of chloride anti-icing materials on the process of abrasion of asphalt pavement in the autumn-winter period. Occurrence of big differences of temperature and humidity accelerates processes of aging of materials from which layers are made, influencing their durability and wear resistance.

scholarly journals Determination of boom vibrations of the road header during cutting based on the analysis of images from high-speed cameras

2019 ◽  
Vol 2 (1) ◽  
pp. 37-49
Author(s):  
Piotr Cheluszka ◽  
Rajmund Mann
Keyword(s):  
High Speed ◽  
Time Lapse ◽  
Point Of View ◽  
The Body ◽  
Cutting Process ◽  
Mining Machine ◽  
Experimental Investigations ◽  
Face Surface ◽  
The Road ◽  
Characteristic Points

Abstract Excavation, especially of hard rocks, using boom-type road headers is a source of strong vibrations of the boom in which they are equipped. These vibrations are transferred through construction nodes further to the turntable and the body of the road header. On the one hand, they are of great importance from the point of view of the durability and the reliability of the mining machine. On the other hand, they affect the variability of the parameters at which the process of cutting the heading face surface of a drilled roadway or tunnel is carried out. For the purpose of determining the vibration intensity of the boom of the road header a photogrammetry system based on two high-speed cameras Phantom Miro LC 120 was used. During the experimental investigations of the cutting process of a cement-sand block using the R-130 road header, the boom and turntable movements were recorded. The analysis of the time-lapse pictures of the recorded footage obtained from the high-speed cameras using dedicated TEMA 3D software allowed to determine the spatial trajectory of movement of the boom and the turntable during the cutting of the massive with specified mechanical properties with set values of the parameters of this process. Basing on the time courses of the coordinates of the boom and turntable characteristic points, the courses of the actual boom swinging speed and acceleration components of its vibrations were determined. The intensity of these vibrations was related to the conditions of the cutting process.

scholarly journals Comparative evaluation of dump trucks with rigid and articulated frame in conditions of road construction production

2020 ◽  
Vol 17 (4) ◽  
pp. 174-181
Author(s):  
V. N. Dobromirov ◽  
◽  
K. I. Fomin ◽  
U. N. Meike ◽  
◽  
...  
Keyword(s):  
Information Search ◽  
Comparative Evaluation ◽  
Load Capacity ◽  
Statistical Processing ◽  
Road Construction ◽  
The Body ◽  
Dump Truck ◽  
The Road ◽  
Dump Trucks ◽  
Information Materials

The article presents the analysis results of the design of dump trucks used in road construction field. The authors point out the tendency of expanding the use of dump trucks with articulated frames in the world practice. The necessity of evaluating the possibilities of domestic manufacturers to produce the machines of this type is justified. Comparative evaluation of samples was carried out by comparing generalized indicators of the vehicle quality determined by their technical level coefficients, as well as by directly comparing a number of specific indicators of their performance properties. Information search, statistical processing of information materials, expert research and mathematical modeling were used as scientific methods for obtaining the initial data for evaluation. The comparative qualimetric assessment of the operational capabilities of dump trucks of various designs gives grounds to recognize that the use of a machine with an articulated frame for direct filling of the road embankment will be preferable to machines of frame construction. This is due to the fact that the articulated dump truck has a higher cross-country ability and maneuverability, while having a certain reserve for increasing the load capacity and the similar cargo capacity of the body with the frame truck. The evaluation results confirm the feasibility of producing a domestic dump truck with an articulated frame.

scholarly journals Vibration modeling of a vehicle equipped with MR damper and aerodynamic elements

2019 ◽  
Vol 20 (1-2) ◽  
pp. 57-61
Author(s):  
Wiesław Grzesikiewicz ◽  
Michał Makowski
Keyword(s):  
High Speed ◽  
Mr Damper ◽  
Road Surface ◽  
Vehicle Model ◽  
Numerical Investigations ◽  
The Road ◽  
Mr Dampers ◽  
On The Road ◽  
Magneto Rheological ◽  
Vibration Modeling

We considered of a vehicle model equipped with controlled magneto-rheological (MR) dampers and controlled aerodynamic elements. The vibrations of the vehicle moving at high speed during acceleration and braking are analysed. The purpose of this analysis is to determine the effect of forces generated on aerodynamic elements on vehicle vibrations and changes in wheel pressure on the road surface during acceleration and braking. The presented work presents the results of numerical investigations obtained on the basis of the developed vehicle model.

Analysis and Measurement of the Relative Movements between the Road Wheels of a Vehicle and the Road Surface

1972 ◽  
Vol 186 (1) ◽  
pp. 793-806
Author(s):  
D. M. Butler ◽  
J. R. Ellis
Keyword(s):  
Experimental Evidence ◽  
The Body ◽  
Road Surface ◽  
The Road ◽  
Suspension Performance ◽  
Ride And Handling

A method of analysis of suspension performance has been developed and is supported by experimental evidence. The particular advantage of this analysis is that all the suspension characteristics of real suspensions are calculated for all possible positions of the suspensions in a manner which relates the wheel movements directly to the body motions. The roll centre concept is discarded, with the result that the wheel movements, and hence tyre forces, which were masked by the limitations of the roll centre assumptions, are now available for examination and inclusion in any vehicle study. This has resulted in the development of more realistic models of vehicle ride and handling including anti-dive attitudes and other phenomena.

Study on Construction Machinery Speed Measurement Based on Road Surface Texture Image

2011 ◽  
Vol 135-136 ◽  
pp. 950-953
Author(s):  
Shou Feng Jin ◽  
Yong Biao Hu
Keyword(s):  
Surface Texture ◽  
High Speed ◽  
Road Surface ◽  
Continuous Image ◽  
Construction Machinery ◽  
The Road ◽  
Essential Variable ◽  
Image Pixels ◽  
Set Up ◽  
Moving Speed

The construction machinery moving speed is an essential variable to identify its attractive performance. To realize construction machinery real-time and adaptive control, it is necessary to measure the machinery actual speed. But the traditional measurement method is not precise enough and costly too much. To search a new method, the high-speed linear CCDcamera is used to collect the road surface gray image. A machinery vision model is set up for the random road surface texture. Using cross-correlation algorithm two frame continuous image pixels are figured out. The construction machinery moving speed can be counted out by analyzing the vision model projection relationship and the two frame continuous image time.The feasibleness and precision of this method are proved by experiments.

scholarly journals Performance Effects of Shock Absorber and Spiral Springs Against Vertical Vehicle Expenses Weighing the Road Structure

2020 ◽  
Vol 7 (1) ◽  
pp. 79
Author(s):  
Simon Ka'ka ◽  
Festo Andre H
Keyword(s):  
Mathematical Modeling ◽  
Shock Absorber ◽  
Reaction Force ◽  
The Body ◽  
Road Surface ◽  
Vertical Load ◽  
The Road ◽  
Performance Effects ◽  
On The Road ◽  
System Transfer Function

This study aims to examine more about the effect of vertical dynamic load of vehicles and changes in dimensional barriers on the road surface in its path. Experimentally this fluctuating load is replaced by a pneumatic force change based on the regulation of air pressure on the regulator. The deviations generated by the varying load work are measured by placing a proximity sensor along the spring movement. The amount of vertical load transformation reaches the road surface is measured by using Load cell. Characteristics of vertical dynamic vibration occurring due to several dimensional barriers, U (cm) obtained using mathematical modeling method with 2 DOF suspension system transfer function.  The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14 seconds with deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d = 1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is only duration t = 0.22 s, because the spring reaction force and shock absorber can absorb 25% vibration against the sprung and un-sprung vertical load of the vehicle.

scholarly journals PENGARUH MEDITASI DALAM PENDIDIKAN ISLAM UNTUK MEMPERKUAT SISTEM IMUN SEBAGAI TINDAKAN MELAWAN COVID-19

2020 ◽  
Vol 5 (2) ◽  
pp. 210-225
Author(s):  
Sonia Sinta Salsabila Sonia
Keyword(s):  
Immune System ◽  
The Body ◽  
Islamic Education ◽  
Data Sources ◽  
Library Research ◽  
Using Data

Abstract Meditation in Islamic education can be done by way of worship such as dhikr and prayer. To prevent covid-19, a strong immune system is needed. In an effort to improve the immune system, Islamic education meditation is one way that can help improve the immune system. The purpose of this study is to ensure that meditation in Islamic education is able to prevent the exposure of covid-19. The method used in this study is a qualitive method in the form of library research and using data sources such as journals, book, and articles. The results of this study indicate that most people feel worried and paniced, if by doing dhikr and prayer they will feel calm and not feel panic so that the immune system can increase. Meditation in Islamic education if done continuously it will increase the immune system in the body to the maximum.

scholarly journals Levels of vibration transmitted to the operator of the tractor equipped with front axle suspension

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Daniele Pochi ◽  
Roberto Fanigliulo ◽  
Laura Fornaciari ◽  
Gennaro Vassalini ◽  
Marco Fedrizzi ◽  
...  
Keyword(s):  
High Speed ◽  
Travel Speed ◽  
Front Axle ◽  
Operating Conditions ◽  
Road Surface ◽  
Air Conditioner ◽  
Test Results ◽  
The Road ◽  
Seat Suspension ◽  
Agricultural Tractors

In recent years the comfort and the preservation of the health of the operators became central issues in the evolution of agricultural machinery and led to the introduction of devices aimed at improving working conditions. Thereby, for instance, the presence of air conditioner, soundproof cab and driver seat suspension became normal on agricultural tractors. The vibrations are one of the most complex issues to deal with, being determined by the characteristics and interaction of elements such as tyres, axles, mainframe, cab and seat suspension. In this respect, manufacturers are trying to improve their products, even integrating these elements with new devices such as the suspension on the front axle of the tractor, aimed at reducing the level of vibrations during the transfers at high speed. One of these underwent tests at CRA-ING. Since its purpose is to reduce the level of vibration transmitted to the driver, their measurements in different points of the tractor and in different operating conditions, were compared in order to evaluate the effectiveness of the device, expressed as time of exposure. The suspension system of the front axle is designed to absorb the oscillations (especially pitching) determined by irregularities in the road surface, allowing an increased control of the vehicle at high speed, as demonstrated by the test results and confirmed by the driving impressions outlined by the operator. The action of the device under these conditions results in an increase of the exposure time, important fact because of the relevance of the road transfer operations of tractors with mounted implements or trailers to tow and of the tendency to increase the speed limit for the road tractors (in Germany were brought to 50 km h–1 for several years). The action just described is less evident with increasing irregularity of the road surface and with the decrease of the travel speed. Nevertheless, in such conditions, the device appears to positively work along the other directions, in particular in the Z-axis, improving the action of the suspension of the driver seat.

scholarly journals Using In-Vehicle Monitoring Data to Assess Road Conditions of Traffic Flows

2022 ◽  
Vol 19 (4) ◽  
pp. 34-39
Author(s):  
I. O. Chernyaev ◽  
S. A. Evtyukov
Keyword(s):  
Adaptive Systems ◽  
The Body ◽  
Road Surface ◽  
Vehicle Body ◽  
Average Level ◽  
Time Interval ◽  
Vertical Acceleration ◽  
Traffic Flows ◽  
The Road ◽  
Vertical Accelerations

 Developments in adaptive systems for maintenance and repair of automotive vehicles set the task of monitoring the conditions of their operation. One of the main factors determining these conditions is the type of road surface.The article describes the results of identification of the type (and condition) of the road surface obtained by theoretical and experimental methods based on the analysis of vertical accelerations recorded on the vehicle body.The purpose of research was to provide a possibility of continuous monitoring of the type of road surface on which a vehicle is driving, with the subsequent application of the obtained data to correct maintenance intervals. The results of experiments have shown the dependence of the vertical acceleration of the body on the micro-profile of the road surface. The described experimentally obtained profiles of vertical accelerations refer to different types of road surface in different conditions. For quantitative assessment, it is proposed to calculate the average level of accelerations as an integral average over a certain time interval.The results of the experiments have allowed to substantiate the empirical dependence of the average level of accelerations on speed of a vehicle. Based on this dependence, a method is proposed for recalculating the current values of the average levels of accelerations obtained at different speeds into values adjusted to the base speed to ensure the possibility of their comparison.It is shown that based on the values of average acceleration levels obtained through operation monitoring regarding a previously known type of road surface, it is possible to determine its condition. A short algorithm is formulated for practical implementation and assessment of road conditions of traffic flows. As for hardware, it is proposed not to equip a vehicle with additional sensors but to use operational standard accelerometers as part of in-vehicle emergency call systems, e.g., ERA-GLONASS equipment units. 

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