turning radius
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Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 482
Author(s):  
Jiachen Yang ◽  
Tianlei Ni ◽  
Lin Liu ◽  
Jiabao Wen ◽  
Jingyi He ◽  
...  

Marine surveying is an important part of marine environment monitoring systems. In order to improve the accuracy of marine surveying and reduce investment in artificial stations, it is necessary to use high-precision GNSS for shipborne navigation measurements. The basic measurement is based on the survey lines that are already planned by surveyors. In response to the needs of survey vessels sailing to the survey line, a method framework for the shortest route planning is proposed. Then an intelligent navigation system for survey vessels is established, which can be applied to online navigation of survey vessels. The essence of the framework is that the vessel can travel along the shortest route to the designated survey line under the limitation of its own minimum turning radius. Comparison and analysis of experiments show that the framework achieves better optimization. The experimental results show that our proposed method can enable the vessel to sail along a shorter path and reach the starting point of the survey line at the specified angle.


2022 ◽  
Vol 5 (1) ◽  
pp. 63-88
Author(s):  
Gizem Kodak ◽  
Gökhan Kara ◽  
Murat Yıldız ◽  
Aydın Şalcı

In this study, maritime accidents that occurred in the Strait of Istanbul over a 10-year period were evaluated in terms of ship-based risk factors. The frequency analysis was performed using the R - Studio program language. In this context, the accident data obtained from the Ministry of Transport and Infrastructure Main Search and Rescue Coordination Center were matched with the ship information accessed from Türk Loydu database. Thus, ship origin risk factors to be used within the scope of the study were determined and 10 different criteria were included in the analysis. These are ship length, ship breadth, ship draught, ship age, ship DWT, turning point, turning radius, L/B ratio, B/T ratio and number of propellers. The process of creating a data set was completed by spatially filtering the data and classifying of the ship-based causes accidents. The variables were examined with frequency analysis in the perspective of the Law of Large Numbers. With the results obtained, optimum characteristics based on ship origin risk factors have been revealed for each ship type that will pass through the Strait.


2021 ◽  
Vol 9 (12) ◽  
pp. 1404
Author(s):  
Shenyu Xuan ◽  
Chengsheng Zhan ◽  
Zuyuan Liu ◽  
Qiaosheng Zhao ◽  
Wei Guo

In level ice, the maneuvering motion of icebreakers has a major influence on the global ice loads of the hull. This study researched the influences of the drift angle and turning radius on the ice loads of the icebreaker Xue Long through a partial numerical method based on the linear superposition theory of ice loads. First, with reference to the Araon model tests performed by the Korea Research Institute of Ships and Ocean Engineering (KRISO), numerical simulations of Araon’s direct motion were carried out at different speeds, and the average deviation between numerical results and model test results was about 13.8%. Meanwhile, the icebreaking process and modes were analyzed and discussed, compared with a model test and a full-scale ship trial. Next, the maneuvering captive motions of oblique and constant radius were simulated to study the characteristics of ice loads under different drift angles and turning radii. Compared with the maneuvering motion model tests in the ice tank of Tianjin University and the Institute for Ocean Technology of the National Research Council of Canada (NRC/IOT), the numerical results had good agreement with the model test results in terms of the variation trend of ice loads and ice–hull interaction, and the influences of drift angle and turning radius on ice resistance and transverse force, which have a certain reference value for sailing performance research and the design of the hull form of icebreaker ships, are discussed.


Author(s):  
Ashaa Supramaniam ◽  
Muhammad Aizzat Zakaria ◽  
Baarath Kunjunni ◽  
Mohamad Heerwan Bin Peeie ◽  
A. Fakhri Ab. Nasir ◽  
...  

2021 ◽  
Author(s):  
◽  
B.A. Hulley

<p>I am Sisyphus and architecture is my boulder. For those who are not already familiar, Sisyphus is the Greek mythological king of Ephyra. However, he is perhaps most well-known for his unique, boulder-rolling, fate. As punishment for deceitfulness, Sisyphus was condemned to a life in which he was to roll an immense boulder up a hill, only to watch it roll back down again; he was to repeat this task for eternity (Homer, Odyssey, XI.593). At the beginning of the final year of my architecture master’s degree, I felt much like I imagine Sisyphus to feel as he walks back down the hill to begin his task once more. Another year at university pushing another piece of architecture up the hill of hopeless, sure to be lost to interpretation, meaning - something with which many contemporaries, and architectural critics seem to have become mildly obsessed. This incessant striving for meaning is reinforced through the typical university design project’s marking schedule. It is common a student must prove that his or her design is meaningful, and was not merely plucked from their imagination. Often, according to these marking schedules, a ‘good’ design must have undergone numerous conceptual iterations (methodology), have included a range of theoretical and practical influences (context) and be something that no-one has seen before (originality). Other than undermining a student’s confidence in his or her own imaginative creativity and the value of creativity alone, this demonstrates the level of the contemporary architectural critics’ obsession with meaning. It is this hopeless push back up the hill of meaning that we now too often call design. This phenomenon can also be observed outside of the university walls. A fine example is Le Corbusier’s Villa Savoye which, though no longer contemporary, is still undoubtedly relevant due to its lingering influence and fame. I will also admit that I would certainly be lying if I said that provocation has had no effect on my selection; I find it serves as a useful tool in point making. Regardless, Villa Savoye is a landmark of hopeless intended meaning. Corbusier’s five points of architecture are indicative of the meaning he had hoped to convey through this building: an original expression and glorification of the Modern (Western) context of living (Corbusier, 1986). This is all fine and well, and yes it is true that one can recognise this expression in the architecture once it has been explained. In fact, I have no doubt that some uninformed observers may even realise that the semicircular path of the Villa Savoye’s driveway is exactly the turning radius of a 1927 Citroën automobile. However even of those impressive few who do, even fewer will recognise this as a design strategy to aid in the celebration of the industrial phenomena of the automobile. The building’s context, originality and methodology, its meaning, have undeniably been lost to interpretation - a fate shared by all attempts to portray and interpret meaning in architecture. So is it sensible to strive for meaning so passionately? A remarkably similar question was identified by a number of post-war philosophers who, spurred by the atrocities and revelations of war, went on to become the pioneers of movements which now collectively fit under the heading Existentialism. Questions around the conditions of existence, and whether any human can experience true meaning within the apparent meaninglessness of our universe, began to be considered (Solomon, 1974). Within this, the theory of Absurdism arose from the identification of the paradoxical act of an individual’s hopeless attempt to determine meaning within a meaningless existence; that being the Absurd Act. The similarities are, I hope, apparent, as it is the identification of this similarity that initiated this thesis. Just as individuals seek meaning in their existence, they seek meaning in their architecture. And both can undeniably be considered Absurd Acts due to the limitations of perception and interpretation. I need to explain Absurdism in more depth, and I do so in the following chapter, but what needs to be understood for now is that, according to the Absurdist theory, no individuals will find true meaning in their meaningless universe, or in their architecture. Assuming you too refuse to accept this bleak outlook, we must ask a question of architecture, and existence also. How can its meaning be validated? The clues to a solution lie in the discussions of Absurdism; and it is the findings and explanations of Albert Camus that will pave the path that I will follow in the establishment of architecture within the paradox of meaninglessness.</p>


2021 ◽  
Author(s):  
◽  
B.A. Hulley

<p>I am Sisyphus and architecture is my boulder. For those who are not already familiar, Sisyphus is the Greek mythological king of Ephyra. However, he is perhaps most well-known for his unique, boulder-rolling, fate. As punishment for deceitfulness, Sisyphus was condemned to a life in which he was to roll an immense boulder up a hill, only to watch it roll back down again; he was to repeat this task for eternity (Homer, Odyssey, XI.593). At the beginning of the final year of my architecture master’s degree, I felt much like I imagine Sisyphus to feel as he walks back down the hill to begin his task once more. Another year at university pushing another piece of architecture up the hill of hopeless, sure to be lost to interpretation, meaning - something with which many contemporaries, and architectural critics seem to have become mildly obsessed. This incessant striving for meaning is reinforced through the typical university design project’s marking schedule. It is common a student must prove that his or her design is meaningful, and was not merely plucked from their imagination. Often, according to these marking schedules, a ‘good’ design must have undergone numerous conceptual iterations (methodology), have included a range of theoretical and practical influences (context) and be something that no-one has seen before (originality). Other than undermining a student’s confidence in his or her own imaginative creativity and the value of creativity alone, this demonstrates the level of the contemporary architectural critics’ obsession with meaning. It is this hopeless push back up the hill of meaning that we now too often call design. This phenomenon can also be observed outside of the university walls. A fine example is Le Corbusier’s Villa Savoye which, though no longer contemporary, is still undoubtedly relevant due to its lingering influence and fame. I will also admit that I would certainly be lying if I said that provocation has had no effect on my selection; I find it serves as a useful tool in point making. Regardless, Villa Savoye is a landmark of hopeless intended meaning. Corbusier’s five points of architecture are indicative of the meaning he had hoped to convey through this building: an original expression and glorification of the Modern (Western) context of living (Corbusier, 1986). This is all fine and well, and yes it is true that one can recognise this expression in the architecture once it has been explained. In fact, I have no doubt that some uninformed observers may even realise that the semicircular path of the Villa Savoye’s driveway is exactly the turning radius of a 1927 Citroën automobile. However even of those impressive few who do, even fewer will recognise this as a design strategy to aid in the celebration of the industrial phenomena of the automobile. The building’s context, originality and methodology, its meaning, have undeniably been lost to interpretation - a fate shared by all attempts to portray and interpret meaning in architecture. So is it sensible to strive for meaning so passionately? A remarkably similar question was identified by a number of post-war philosophers who, spurred by the atrocities and revelations of war, went on to become the pioneers of movements which now collectively fit under the heading Existentialism. Questions around the conditions of existence, and whether any human can experience true meaning within the apparent meaninglessness of our universe, began to be considered (Solomon, 1974). Within this, the theory of Absurdism arose from the identification of the paradoxical act of an individual’s hopeless attempt to determine meaning within a meaningless existence; that being the Absurd Act. The similarities are, I hope, apparent, as it is the identification of this similarity that initiated this thesis. Just as individuals seek meaning in their existence, they seek meaning in their architecture. And both can undeniably be considered Absurd Acts due to the limitations of perception and interpretation. I need to explain Absurdism in more depth, and I do so in the following chapter, but what needs to be understood for now is that, according to the Absurdist theory, no individuals will find true meaning in their meaningless universe, or in their architecture. Assuming you too refuse to accept this bleak outlook, we must ask a question of architecture, and existence also. How can its meaning be validated? The clues to a solution lie in the discussions of Absurdism; and it is the findings and explanations of Albert Camus that will pave the path that I will follow in the establishment of architecture within the paradox of meaninglessness.</p>


Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Kang Niu ◽  
Jianqiao Yu ◽  
Xi Chen ◽  
Di Yang ◽  
Ziyuan Li

A new process of agile turn with engine reignition is proposed in this paper. Compared with the traditional process, this process includes deceleration phase, larger angle manoeuvre phase, and engine reignition phase. Firstly, the paper describes the new process of agile turn. Then, several constraints in this process are described. Considering all these constraints and assumptions, a new dynamic model including two-stage engine and deceleration parachute is established. Then, the optimal control laws are designed and the timing point determination of the secondary engine ignition is discussed. By using Pontryagin principle, the optimal control laws for each actuator are derived. In terms of determining the optimal timing point of the secondary engine ignition, the paper gives the process of proof. Finally, several numerical simulations are given to demonstrate the effectiveness of the method proposed in this paper. According to all these numerical simulations, it is obvious that the new process of agile turn proposed in this paper is better than traditional process especially in having a smaller turning radius, a shorter turning time, and a high terminal velocity.


2021 ◽  
Vol 11 (22) ◽  
pp. 10707
Author(s):  
Youngjae Lee ◽  
Junseok Lee ◽  
Jae-Woo Lee

As populations become concentrated in cities, traffic congestion increases, and urban air mobility (UAM) is being considered to face this problem. Accordingly, many institutions and companies around the world are developing UAM vehicles, building infrastructure, and researching flight operating systems. In this study, three holding area concepts have been designed that can control air traffic flows and avoid bad weather conditions when UAM vehicles are operating. These holding areas have been considered to allow UAM vehicles to fly by avoiding collisions with other UAM vehicles or structures such as buildings. After validating the turning radius analysis with existing aircraft, a case study on the holding area concept design for the Seoul–GyungIn area was performed to determine whether UAM vehicles can turn within a narrow radius. It was not possible for winged-type UAM vehicles to turn across the Han River at cruise speed. The holding area concepts and the turning procedure of this study can be used as guidelines when designing UAM corridors or UAM flight routes.


2021 ◽  
Vol 2094 (4) ◽  
pp. 042019
Author(s):  
A P Chajkin ◽  
R Yu Dobretsov ◽  
V A Sokolova ◽  
E A Tikhonov ◽  
M N Kalimullin ◽  
...  

Abstract The article considers the features of performing kinematic and power analysis of a controlled power mechanism for the transmission of wheeled transport and transport-technological machines. Such mechanisms are currently used mainly on cars in order to improve handling, stability, traction and dynamic properties in severe road conditions. Such mechanisms are not produced in Russia, but theoretical studies are currently being conducted, the results of which will allow determining the main parameters of the mechanism and synthesizing its kinematic scheme. The proposed approaches are based on the methods used in the kinematic and force analysis of planetary gears, but it is taken into account that the mechanism of power distribution during operation has two degrees of freedom. It is indicated that there is a structural and functional similarity between the power distribution mechanism of the car and the turning mechanism of the tracked vehicle. A method is proposed for calculating the gear ratio of the power distribution mechanism according to the condition of matching the minimum possible turning radius provided by the steering trapezoid kinematics and the calculated turning radius.


2021 ◽  
Vol 922 (1) ◽  
pp. 012016
Author(s):  
M Idkham ◽  
M Dhafir ◽  
Safrizal ◽  
L Putri

Abstract Palm oil fields with slopes require special wheels for transportation for transporting fresh fruit bunches (FFB), the special wheels in question are modified wheels from the existing cage wheel, the modified wheels can adjust the slope conditions on the land with the lug angle adjustment mechanism. The objective of this study was to test the functional and performance of the modified lug wheel as a means of transporting FFB on sloping land using a hand tractor on a pivot type trailer. Functional testing on the modified lug wheel was carried out by observing changes in the angle of the lugs (0, 15, 30, 45)0 by lifting one of the tractor shafts first using a jack, after which the locking pins were released. The angle change rim can be moved clockwise or anticlockwise by hand according to the desired lug angle. Performance testing on the modified lug wheel is carried out by observing and calculating the slip on the wheel. Functional testing on trailer pivots is carried out by observing all components of the towing system when installed and operated, to determine whether the trailer towing system can function properly. Performance testing on the pivot trailer is done by observing and calculating the turning radius when the tractor turns. Performance testing is also carried out by observing the stability of the two-wheel tractor and trailer. The slope of the land and the angle of the lugs greatly affect wheel slip, the higher the slope on a land, the higher the possibility of wheel slippage during operation. The test results show that the use of modified lug wheels shows better performance at 30° lug angle, as seen from the smaller slip value at 30° lug angle.


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