Safe distance prediction for braking control of bridge cranes considering anti‐swing

Author(s):  
Huili Chen ◽  
Guoliang Liu ◽  
Guohui Tian ◽  
Jianhua Zhang ◽  
Ze Ji
2020 ◽  
Author(s):  
Huili Chen ◽  
Guoliang Liu ◽  
Guohui Tian ◽  
Jianhua Zhang ◽  
Ze Ji

<div>In dynamic environment, the suddenly appeared </div><div>human or other moving obstacles can affect the safety of the </div><div>bridge crane. For such dangerous situation, the bridge crane </div><div>must predict potential collisions between the payload and the </div><div>obstacle, keep safe distance while the swing of the payload must </div><div>be considered in the mean time. Therefore, the safe distance is </div><div>not a constant value, which must be adaptive to the relative </div><div>speed of the bridge crane. However, as far as we know, the </div><div>mathematical model between the safe distance and the relative </div><div>speed of the bridge crane has never been fully discussed. In </div><div>this paper, we propose a safe distance prediction method using </div><div>model prediction control (MPC), which can make sure that the </div><div>crane can stop before the obstacle, and avoid possible collisions, </div><div>while the relative speed and anti-swing are both considered. The </div><div>experimental results prove the effectiveness of our idea.</div>


2020 ◽  
Author(s):  
Huili Chen ◽  
Guoliang Liu ◽  
Guohui Tian ◽  
Jianhua Zhang ◽  
Ze Ji

<div>In dynamic environment, the suddenly appeared </div><div>human or other moving obstacles can affect the safety of the </div><div>bridge crane. For such dangerous situation, the bridge crane </div><div>must predict potential collisions between the payload and the </div><div>obstacle, keep safe distance while the swing of the payload must </div><div>be considered in the mean time. Therefore, the safe distance is </div><div>not a constant value, which must be adaptive to the relative </div><div>speed of the bridge crane. However, as far as we know, the </div><div>mathematical model between the safe distance and the relative </div><div>speed of the bridge crane has never been fully discussed. In </div><div>this paper, we propose a safe distance prediction method using </div><div>model prediction control (MPC), which can make sure that the </div><div>crane can stop before the obstacle, and avoid possible collisions, </div><div>while the relative speed and anti-swing are both considered. The </div><div>experimental results prove the effectiveness of our idea.</div>


2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Wenguang Wu ◽  
Debiao Zou ◽  
Jian Ou ◽  
Lin Hu

The braking quality is considered as the most important performance of the adaptive control system that influences the vehicle safety and ride comfort remarkably. This research is aimed at designing an adaptive cruise control (ACC) system based on active braking algorithm using hierarchical control. Taking into account the vehicle with safety and comfort, the upper decision-making controller is designed based on model predictive control algorithm. Throttle controller and braking controller are designed with feedforward and feedback algorithms as the bottom controller, where the braking controller is designed based on the hydraulic braking model. The whole model is simulated collaboratively with Amesim, Carsim, and Simulink. By comparison with the full deceleration model, the results show that the proposed algorithm can not only make the vehicle maintain a safe distance under the premise of following the target vehicle ahead effectively but also provide favorable driving comfort.


Author(s):  
Huili Chen ◽  
Guoliang Liu ◽  
Guohui Tian ◽  
Jianhua Zhang ◽  
Ze Ji

2012 ◽  
Vol 5 (1) ◽  
pp. 97-110 ◽  
Author(s):  
Yael Darr

Since the 1990s, a new type of Holocaust story has been emerging in Israeli children's literature. This new narrative is directed towards very young children, from preschool to the first years of elementary school, and its official goal is to instil in them an authentic ‘first Holocaust memory’. This essay presents the literary characteristics of this new Holocaust narrative for children and its master narrative. It brings into light a new profile of both writers and readers. The writers were young children during the Holocaust, and first chose to tell their stories from the safe distance of three generations. The readers are their grand-children and their grand-children's peers, who are assigned an essential role as listeners. These generational roles – the roles of a First Generation of writers and of a Third Generation of readers – are intrinsically familial ones. As such, they mark a significant change in the profile of yet another important figure in the Israeli intergenerational Holocaust discourse, the agent of the Holocaust story for children. Due to the new literary initiatives, the task of providing young children with a ‘first Holocaust memory’ is transferred from the educational authority, where it used to reside, to the domestic sphere.


2020 ◽  
Vol 16 (11) ◽  
pp. 1826
Author(s):  
Li Zheng ◽  
Yang Jianwei ◽  
Yao Dechen ◽  
Wang Jinhai ◽  
Pang Qicheng

2021 ◽  
Vol 146 ◽  
pp. 1-8
Author(s):  
Yuanliang Liu ◽  
Zhan Liu ◽  
Jianjian Wei ◽  
Yuqi Lan ◽  
Shenyin Yang ◽  
...  

2019 ◽  
Vol 17 (6) ◽  
pp. 764-783
Author(s):  
Frederike Ambagtsheer ◽  
Linde Van Balen

This article presents the results of a qualitative interview study amongst 41 Dutch transplant professionals. The overarching aim was to acquire in-depth understanding of transplant professionals’ experiences with and attitudes towards patients who purchase kidneys. We found that transplant professionals occasionally treat patients who are suspected of kidney purchases abroad. However, they turn a blind eye to their patients’ suspected purchases. Secrecy and silence function as a tacit agreement between patients and their caregivers that keeps the subject of kidney purchase at a safe distance and allows transplant professionals to ignore its suspected occurrence. They thus participate in the building of walls of secrecy and silence in the organ trade.


Author(s):  
Haojun Huang ◽  
Li Li ◽  
Geyong Min ◽  
Wang Miao ◽  
Yingying Zhu ◽  
...  

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