scholarly journals Influence of Main Road Alignment on Handling Stability of Runaway Vehicle on Truck Escape Ramp

2018 ◽  
Vol 206 ◽  
pp. 04002
Author(s):  
Pinpin Qin ◽  
Yaqi Han ◽  
Heyu Hu ◽  
Guangyi Qin ◽  
Jie Wang

Main road alignment exerts an influence on handling stability of a runaway vehicle to a certain extent, as rational designs of the main road alignment play an important role in ensuring that a runaway vehicle enters a truck escape ramp safely. Firstly, forces acting on the runaway vehicle on the main road are analysed, and the minimum curve radius value and the corresponding approach angle that can prevent lateral rollover and lateral slip are discussed. Secondly, a simulation software, TruckSim, is used to establish a simulation model of the runaway vehicle and the road, wherein the minimum curve radius value and the corresponding approach angle that can prevent lateral rollover and slip are taken as input parameters of the road model. Finally, the established simulation model of the vehicle and road is used to simulate the influence that three types of main road alignment, i.e. a straight line, a right curve and a left curve, respectively have on the handling stability of the runaway vehicle entering a truck escape ramp.

Archaeologia ◽  
1903 ◽  
Vol 58 (2) ◽  
pp. 359-382
Author(s):  
E. Towry Whyte

About a mile and a half south from Penrith on the main road from Carlisle to York and on the Westmorland side of the river Eamont, which is the boundary between the two counties, stand the ruins of Brougham Castle, one of the most important strongholds of the great Clifford family, who owned no less than four castles in the county, namely, Brougham, Appleby, Brough (under Stanmore), and Pendragon, and also Skipton in Craven, Yorkshire. From comparatively early times the site of this castle has been a place of some importance, as the Romans had here a strong camp, the remains of which are still to be seen in the field to the south of the present building. The name of this camp was Brovacum, but it has been spelt in various ways. It was a rectangular parallelogram surrounded by a single ditch about 75 feet broad with rounded corners, and had a rampart on the inside. There has also been a berm or terrace between this rampart and the ditch below the main defensive works, which were of timber. No trace of the entries to the camp now remain. The ditch on the south side is still complete, and portions on the east and west. Mr. Gr. T. Clark, in a paper in the Proceedings of the Cumberland and Westmorland Archæological Society gives the area within the ditch as 113 yards by 134 yards at the present time, but says it was most likely 198 yards originally, as that was the proportion of the Brough camp. The reason for placing this camp where it is was to guard the ford across the river Eamont where the road from York to Carlisle crossed that river. This ford I think was a little further down the stream than the present bridge, at a point where it is very shallow in summer, but during the winter and spring it must have been often dangerous and at times impassable. Of course the bed of the river may have been quite different in Roman times, but probably its course was much the same as at present. If I am right as to the site of the ford, the Roman road was continued in a straight line from about the Countess's Pillar to the brow of the hill above the river, down which it went at a sharp angle to the water, and then straight across the marshy field until it meets the road as traced by the ordnance surveyors. The camp stands on the south side of the river about 30 feet above it on flat land; and if Mr. Clark's suggestion as to the original size be correct its north-east corner was about 50 yards distant from it. On the opposite side for some considerable distance must have been marsh land, probably often flooded, whilst still further north rose the conspicuous hill now known as Penrith Beacon, under the southern flank of which the Roman road ran in an almost straight line to the next important camp, Voreda, near the village of Plumpton, about five miles north-north-west of Penrith. The camp was also, in all probability, approached by another road, which ran past the present Brougham Hall and across the river Lowther near the bridge and on to Yanwath, where it joined the road that goes over High Street, Avhich in places attained an elevation of 2,200 feet. A third road I think led to the camp from the south, going over Crosby Ravensworth Fell and so on to Lancaster. The main road all the way from Brough Castle to Carlisle is a most wonderful piece of engineering, when the probable condition of the country when the Romans made it is considered. Its gradients are seldom excessively steep, and yet it keeps an almost straight line for miles; and this was surveyed and made at a time when the whole country was a dense forest and the surrounding hills inhabited by a warlike and hostile race. It is rather surprising, considering the military importance of Brovacum, that it has not yielded more important monuments than it seems to have done. Stukeley mentions that he saw many fragments of altars and inscriptions at the Hall (Brougham Hall), and in the wall by the Roman road beyond the castle and near the Countess's Pillar a pretty “buste,” part of a funeral monument, and further on another bas-relievo much defaced, so that in his time perhaps there were some monuments which are now lost; but Chancellor Ferguson in his History of Westmorland says it “has not yielded many inscribed stones, and those not of any great importance. A couple of altars to the local deity Belatucador and four or five fragments of tombstones.” A portion of an inscription remains on a slab in the ceiling of a doorway passage leading to the second floor of the keep; the only word I could read for certain was Titus.


2021 ◽  
Vol 10 (2) ◽  
pp. 124
Author(s):  
Erny Agusri ◽  
Muhammad Arfan ◽  
Muhammad Arfan

VISSIM is a Simulations model which means a city traffic simulation model. VISSIM is a simulation software used by professionals to create simulations from dynamic traffic scenarios before making real plans. This research was conducted to determine how traffic performance and traffic performance optimization at the junctions between the existing conditions and the Vissim program caused by congestion. An effective method for overcoming non-jammed junctions can be made using the VISSIM method. This study was conducted at THREE-WAY JUNCTION in Jl. Sukabangun 2 (South) - Jl. R.A Abusamah (West) - Jl. Sukabangun 2 (Utara) - Jl. BeringinSukabangun 2 (East). In this study, three variations were used, namely the traffic light method, the method of forbidden turning right, and the method of dividing the road and turning signs. The results of PTV Vissim simulation showed that the traffic light method has a quite high queue length, namely 79m compared to the existing condition of 63m, for the vehicle delay in this method is 98.954s. On the method of forbidden turning right from the direction of Jl. BeringinSukabangun 2 (East) has a low queue length of 0.287m compared to the existing condition of 63m. The vehicle delay in this method is 13.307s. The method of dividing the road and turning signs, the queue length is quite low at 1.147m compared to the existing condition of 63m. The vehicle delay in this method is 30,169s. The results of the simulation revealed that the most effective method at THREE-WAY JUNCTION in jalanSukabangun 2 is method of forbidden turning right, dividing the roads and turning signs.  


2019 ◽  
Vol 11 (21) ◽  
pp. 6088 ◽  
Author(s):  
Praful Potti ◽  
Marin Marinov ◽  
Edward Sweeney

This paper analyses the scope for moving urban freight through rail by evaluating the utilisation levels of the Cross-City railway line in The United Kingdom (UK), running between Lichfield Trent Valley and Birmingham New Street. A simulation model of the railway system was built and implemented using SIMUL8 computer software. The results from the simulation model suggest that the railway line is being under-utilised. These low utilisation levels of the line presented a case to propose three scenarios that has the potential to carry urban freight by rail through Lichfield Trent Valley to Birmingham New Street Station. The total number of services operated on the line is varied between different scenarios. The proposed three scenarios could not only exploit the existing railway infrastructure by improving the utilisation levels of the currently operating railway line, but also proved to reduce an amount of green-house gases (GHGs) emissions that are caused by heavy goods vehicles (HGVs) moving on the road. After simulating all the proposed scenarios in the SIMUL8 simulation software and analysing the results, scenario number 3 seemed to be the best replacement to the actual system as it presents a case to increase the number of train services running per day by in the line by 108 and causing a drastic improvement in the utilisation levels by an increase of 341.71% to that of the actual system. This proposed system has the potential to eliminate 5400 HGVs moving on the road per day that causes a reduction of CO2 gas by approximately 5.4%. All the scenarios presented in the study assures a sustainable method to move the urban freight by rail that has the potential to reduce congestion and emissions in the West Midlands region of the United Kingdom (UK).


Author(s):  
Ping Wang ◽  
Jun Lai ◽  
Tao Liao ◽  
Jingmang Xu ◽  
Jian Wang ◽  
...  

Train derailments in railway switches are becoming more and more common, which have caused serious casualties and economic losses. Most previous studies ignored the derailment mechanism when vehicles pass through the turnout. With this consideration, this work aims to research the 3D derailment coefficient limit and passing performance in turnouts through the quasi-static analysis and multi-body dynamic simulation. The proposed derailment criteria have considered the influence of creep force and wheelset yaw angle. Results show that there are two derailing stages in switch panel, which are climbing the switch rail and stock rail, respectively. The 3D derailment coefficient limit at the region of top width 5 mm to 20 mm is much lower than the main track rail, which shows that wheels are more likely to derail in this area. The curve radius before the switch rail is suggested to be set as 350 m. When the curve radius before turnout is 65 m, the length of the straight line between the curve and turnout needs to be larger than 3 m. This work can provide a good understanding of the derailment limit and give guidance to set safety criteria when vehicles pass through the turnout.


This paper uses the method of kinematic waves, developed in part I, but may be read independently. A functional relationship between flow and concentration for traffic on crowded arterial roads has been postulated for some time, and has experimental backing (§2). From this a theory of the propagation of changes in traffic distribution along these roads may be deduced (§§2, 3). The theory is applied (§4) to the problem of estimating how a ‘hump’, or region of increased concentration, will move along a crowded main road. It is suggested that it will move slightly slower than the mean vehicle speed, and that vehicles passing through it will have to reduce speed rather suddenly (at a ‘shock wave’) on entering it, but can increase speed again only very gradually as they leave it. The hump gradually spreads out along the road, and the time scale of this process is estimated. The behaviour of such a hump on entering a bottleneck, which is too narrow to admit the increased flow, is studied (§5), and methods are obtained for estimating the extent and duration of the resulting hold-up. The theory is applicable principally to traffic behaviour over a long stretch of road, but the paper concludes (§6) with a discussion of its relevance to problems of flow near junctions, including a discussion of the starting flow at a controlled junction. In the introductory sections 1 and 2, we have included some elementary material on the quantitative study of traffic flow for the benefit of scientific readers unfamiliar with the subject.


2021 ◽  
Author(s):  
XueTao Wei ◽  
caixue yue ◽  
DeSheng Hu ◽  
XianLi Liu ◽  
YunPeng Ding ◽  
...  

Abstract The processed surface contour shape is extracted with the finite element simulation software, and the difference value of contour shape change is used as the parameters of balancing surface roughness to construct the infinitesimal element cutting finite element model of supersonic vibration milling in cutting stability domain. The surface roughness trial scheme is designed in the central composite test design method to analyze the surface roughness test result in the response surface methodology. The surface roughness prediction model is established and optimized. Finally, the finite element simulation model and surface roughness prediction model are verified and analyzed through experiment. The research results show that, compared with the experiment results, the maximum error of finite element simulation model and surface roughness prediction model is 30.9% and12.3%, respectively. So, the model in this paper is accurate and will provide the theoretical basis for optimization study of auxiliary milling process of supersonic vibration.


2018 ◽  
Vol 203 ◽  
pp. 03005
Author(s):  
Idzham Fauzi Mohd Ariff ◽  
Mardhiyah Bakir

A dynamic simulation model was developed, calibrated and validated for a petrochemical plant in Terengganu, Malaysia. Calibration and validation of the model was conducted based on plant monitoring data spanning 3 years resulting in a model accuracy (RMSD) for effluent chemical oxygen demand (COD), ammoniacal nitrogen (NH3-N) and total suspended solids (TSS) of ±11.7 mg/L, ±0.52 mg/L and ± 3.27 mg/L respectively. The simulation model has since been used for troubleshooting during plant upsets, planning of plant turnarounds and developing upgrade options. A case study is presented where the simulation model was used to assist in troubleshooting and rectification of a plant upset where ingress of a surfactant compound resulted in high effluent TSS and COD. The model was successfully used in the incident troubleshooting activities and provided critical insights that assisted the plant operators to quickly respond and bring back the system to normal, stable condition.


Author(s):  
K. Sriram ◽  
K. Anirudh ◽  
B. Jayanth ◽  
J. Anjaneyulu

The main objective of the Suspension of a vehicle is to maximize the contact between the vehicle tires and the road surface, provide steering stability and provide safe vehicle control in all conditions, evenly support the weight of the vehicle, transfer the loads to springs, and guaranteeing the comfort of the driver by absorbing and dampening shock. This paper discusses the kinematic design of a double a-arm Suspension system for an FSAE Vehicle. The hardpoint’s location can be determined using this procedure to simulate motion in any kinematic simulation software. Here, Optimum Kinematics is used as kinematic simulation software, and the results are verified using Msc Adams simulation. The method illustrated deals with the basics of Kinematics which helps to predict the characteristics of the Suspension even before simulating it in the kinematic simulation software.


2021 ◽  
Vol 69 (1) ◽  
pp. 148-178
Author(s):  
Radoje Jevtić

Introduction/purpose: Safety in high residential buildings presents a very important and always actual task. In case of some unforeseen and dangerous occurrences, their residents must be evacuated. Fire, earthquakes, and terrorism are only some of such situations. The speed of evacuation from high residential buildings depends on many different factors. A particularly difficult and complex evacuation task concerns buildings without fire escape stairs. Methods: The modeling method was used in this paper. Based on a real object - a residential building, an appropriate simulation model was realized in appropriate simulation software. Results: The results of this paper have shown that, out of four scenarios, the fastest evacuation was for the evacuation speed of 1.75 m/s. The first two scenarios did not report any jams, unlike the third and fourth scenario; in the third scenario, the occupants' speeds were 0.75 m/s and 1.25 m/s while in the fourth scenario, the simulated occupants' speeds were from 0.75 m/s to 1.75 m/s. Conclusion:The usage of appropriate simulation software enables fast, precise, safe and cheap calculation of evacuation times and it can significantly improve evacuation procedures and evacuation strategies.


2021 ◽  
Vol 15 (4) ◽  
pp. 518-523
Author(s):  
Ratko Stanković ◽  
Diana Božić

Improvements achieved by applying linear programming models in solving optimization problems in logistics cannot always be expressed by physically measurable values (dimensions), but in non-dimensional values. Therefore, it may be difficult to present the actual benefits of the improvements to the stake holders of the system being optimized. In this article, a possibility of applying simulation modelling in quantifying results of optimizing cross dock terminal gates allocation is outlined. Optimal solution is obtained on the linear programming model by using MS Excel spreadsheet optimizer, while the results are quantified on the simulation model, by using Rockwell Automation simulation software. Input data are collected from a freight forwarding company in Zagreb, specialized in groupage transport (Less Than Truckload - LTL).


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