scholarly journals Vehicle Loading Conditions’ Influence Over Front Lighting Requirements and Dipped Beam Vertical Leveling Control Method

2019 ◽  
Vol 3 (2) ◽  
pp. 75-82
Author(s):  
Ahmet Rodoplu ◽  
Hatice Özbek ◽  
Caner Çil
Keyword(s):  
Control Method ◽  
Loading Conditions ◽  
Vehicle Loading ◽  
Front Lighting ◽  
Leveling Control

scholarly journals Angle and Force Hybrid Control Method for Electrohydraulic Leveling System with Independent Metering

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Kailei Liu ◽  
Shaopeng Kang ◽  
Zhongliang Cao ◽  
Rongsheng Liu ◽  
Zhaoxuan Ding
Keyword(s):  
Pid Controller ◽  
Control Method ◽  
Hybrid Control ◽  
Control Function ◽  
Hydraulic Press ◽  
Load Force ◽  
Static Behavior ◽  
Eccentric Load ◽  
Simulation Results ◽  
Leveling Control

The electrohydraulic leveling system of the hydraulic press can realize automatic leveling control function. In order to eliminate the eccentric load force accurately, an electrohydraulic leveling system with independent metering is designed. Quasi-static behavior analysis of the leveling cylinders output forces performance is applied to the electrohydraulic leveling system with independent metering. The angle and force hybrid control method is proposed, and then the AMESim/Simulink cosimulation model is built. The HSIC controller and PID controller are used in the simulation, respectively. Simulation results show that both of the leveling angle control and leveling cylinders output forces control can be realized, simultaneously, and the HSIC controller has higher rapidity and smaller overshoot than the PID controller.

scholarly journals Design of high precision mechatronic-hydraulic leveling system for vehicle-mounted radar

2021 ◽  
Vol 2113 (1) ◽  
pp. 012041
Author(s):  
Jun Xiao ◽  
YanChao Wang ◽  
XiangYu Li ◽  
Jie Zheng
Keyword(s):  
Control System ◽  
High Precision ◽  
Control Method ◽  
Good Control ◽  
Vehicle Body ◽  
Control Performance ◽  
Fuzzy Pid Control ◽  
Short Time ◽  
Leveling Control ◽  
The Mathematical Model

Abstract In order to improve the control performance of vehicle-mounted radar, a high precision leveling control system is designed through mechatronic-hydraulic integration technology. A leveling method combining angle error leveling method and height error leveling method is designed, and inclinometers are set in the front and rear of the vehicle body platform to effectively eliminate the virtual outrigger phenomenon in the leveling process. The mathematical model of hydraulic system is developed, the fuzzy PID control method is introduced, and the four-point support hydraulic leveling control system is developed by using STM32 microcontroller as the control core. The field test proves that the control system has good control performance, high leveling accuracy, short time, and meets the control requirements of the radar vehicle.

Control System Design of Improved Vertical Lifting Stereo Garage with Linear Motor as Transverse Device

2013 ◽  
Vol 416-417 ◽  
pp. 940-945
Author(s):  
Dong Ru Sun ◽  
Xiao Jie Ye ◽  
Liang Cheng ◽  
Yi Hua Yao ◽  
Yun Yue Ye
Keyword(s):  
Control System ◽  
Induction Motor ◽  
Control Method ◽  
Frequency Control ◽  
Linear Motor ◽  
Direct Drive ◽  
Drive Unit ◽  
Linear Induction Motor ◽  
Vehicle Loading ◽  
Slip Frequency

Rotating induction motor serving as transverse device in traditional stereo garage makes system complex and inefficient. Installing linear motor in lifting platform as direct drive unit can remove intermediate links and drag vehicle loading board of parking slot directly. In this paper, control system of vertical lifting stereo garage with linear induction motor is put forward, including overall organization, operating principle and software program.Linear motor is controlled by Programmable Logic Controller (PLC) in slip frequency control method and PI algorithm. Experiment results indicate that linear motor can track reference velocitycurveand the whole stereo garage can store and take out vehicles automatically and efficiently.

Four-point dynamic leveling method for drilling platform application

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dongmin Li ◽  
Guofang Ma ◽  
Jia Li
Keyword(s):  
Coal Mine ◽  
Control Method ◽  
Dynamic Performance ◽  
Three Dimensional ◽  
Underground Coal Mine ◽  
Content Type ◽  
Displacement Sensors ◽  
Leveling Control ◽  
Combined Sensor ◽  
Support Rod

Purpose It is essential to level the drilling platform across which a drilling robot travels in a slant underground coal mine tunnel to ensure smooth operation of the drill rod. However, existing leveling methods do not provide dynamic performance under the drilling conditions of the underground coal mine. A four-point dynamic leveling algorithm is presented in this paper based on the platform attitude and support rod displacement (DLAAD). An experimental drilling robot demonstrates its dynamic leveling capability and ability to ensure smooth drill rod operations. Design/methodology/approach The attitude coordinate of the drilling robot is established according to its structure. A six-axis combined sensor is adopted to detect the platform attitude, thus revealing the three-axis Euler angles. The support rod displacement values are continuously detected by laser displacement sensors to obtain the displacement increment of each support rod as needed. The drilling robot is leveled according to the current support rod displacement and three-dimensional (3 D) attitude detected by the six-axis combined sensor dynamically. Findings Experimental results indicate that the DLAAD algorithm is correct and effectively levels the drilling platform dynamically. It can thus provide essential support in resolving drill rod sticking problems during actual underground coal mine drilling operations. Practical implications The DLAAD algorithm supports smooth drill rod operations in underground coal mines, which greatly enhances safety, reduces power consumption, and minimizes cost. The approach proposed here thus represents considerable benefits in terms of coal mine production and shows notable potential for application in similar fields. Originality/value The novel DLAAD algorithm and leveling control method are the key contributions of this work, they provide dynamical 3 D leveling and help to resolve drill rod sticking problems.

scholarly journals Leveling Control of Vehicle Load-Bearing Platform Based on Multisensor Fusion

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Jianjun Wang ◽  
Jingyi Zhao ◽  
Wei Cai ◽  
Wenlei Li ◽  
Xing Jia ◽  
...  
Keyword(s):  
Control System ◽  
Large Scale ◽  
Pressure Sensors ◽  
Point Load ◽  
Load Bearing ◽  
Suspension Systems ◽  
Vehicle Loading ◽  
Hydraulic Cylinders ◽  
Transport Vehicle ◽  
Leveling Control

In the large-scale transportation, the leveling of the transport vehicle loading platform will determine the safety of the transportation. Therefore, the research on the leveling of the transport vehicle loading platform with hydraulic suspension is carried out. The hydraulic suspension systems are simplified as four-point support. Based on the multisensor data collected by the pressure sensors of the suspension hydraulic cylinders and the double axis inclination sensor of the load-bearing platform, the leveling control system of the four-point load-bearing platform is designed according to the principle of the highest point chasing. In order to verify the precision of the leveling method, the leveling of the control system is simulated by using the software AMESim and MATLAB, and the PID controller is added. The results show that the leveling precision and velocity of this method fully meet the leveling requirements of the transport vehicle. On the basis, the leveling control system for the 100 ton transport vehicle is designed. The double axis inclination sensor is used to monitor the tilt angle of the loading platform in real time. The controller can make the suspension hydraulic cylinders act accordingly according to the four height differences to keep the loading platform level. Finally, the leveling experiment of the transport vehicle is carried out, and the lifting experiment is carried out under the condition of no load to full load. It is concluded that the displacement of the four points of the load-bearing platform of the transport vehicle is basically the same. The leveling control system can control the inclination angle of the platform within 0.25 degrees, and the leveling time is less than 1 second. The leveling process has higher precision and shorter time than other methods, which can provide reference for the leveling design of similar platforms.

scholarly journals Kinematic Analysis and Leveling Control Method for a Novel Wheel- Legged Robot

2015 ◽  
Vol 9 (1) ◽  
pp. 467-474 ◽  
Author(s):  
Sun Zhibo ◽  
Liu Jinhao ◽  
Yu Chunzhan ◽  
Kan Jiangming
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Kinematic Analysis ◽  
Control Method ◽  
Kinematic Model ◽  
Legged Robot ◽  
The Stability ◽  
Leveling Control

The paper introduces a novel auto-leveling system applied to the obstacle-surmounting robot with six wheellegs. The leveling model of the robot with six wheel legs and one articulated steering is analyzed. Besides, the kinematic model of the robot is presented. In order to optimize the leveling algorithm, a special PID control strategy with the leveling matrix is applied to the leveling system. The experiment shows that the new leveling system can improve the efficiency and the stability of the leveling performance: the leveling time is reduced by 3.5 seconds and the obvious tilt fluctuations are decreased by 5 times.

scholarly journals Generalized Relaxation Behavior of Rock Under Various Loading Conditions Using a Constant Linear Combination of Stress and Strain

2021 ◽  
Vol 9 ◽  
Author(s):  
Hailong Zhang ◽  
Yang Tang ◽  
Seisuke Okubo ◽  
Shoujian Peng ◽  
Cancan Chen
Keyword(s):  
Linear Combination ◽  
Control Method ◽  
Relaxation Behavior ◽  
Time Dependent ◽  
Feedback Signal ◽  
Failure Behavior ◽  
Stress And Strain ◽  
Loading Conditions ◽  
Underground Structures ◽  
Dependent Behavior

Time-dependent behavior has been demonstrated to be an essential factor in determining the long-term stability of underground structures. Creep and relaxation experiments are commonly used to investigate time-dependent behavior by subjecting rock to constant stress and strain. However, both stress and strain of in-situ rock masses are likely to change with time, a phenomenon known as generalized relaxation that has not been thoroughly investigated. In this study, a newly proposed control method with a constant linear combination of stress and strain as a feedback signal is used in compression and tension tests to investigate generalized relaxation behaviors of rocks. The results showed that the stress and strain of generalized relaxation are dependent on values of α, which represented generalized relaxation direction. The isochronous curves are enclosed within stress–strain curves of different loading conditions. The variation of stress (∆σ) and strain (∆ε) increases with increasing stress level and decreases with increasing confining pressure. Also, ∆σ and ∆ε in region II are smaller than in regions I and III. Furthermore, by performing brittle rock tests, complete generalized relaxation curves are obtained; three stages are observed, which are similar to conventional creep and relaxation behavior. Finally, the time and generalized relaxation failure behavior of Class I and Class II rock are discussed. The study is a valuable resource for gaining a comprehensive understanding of the time-dependent behavior of rocks and improving the stability and safety of underground structures.

A distributed access control method for wireless LANs in shadowing environments

2001 ◽  
Vol 84 (9) ◽  
pp. 16-26
Author(s):  
Tadao Saito ◽  
Hitoshi Aida ◽  
Terumasa Aoki ◽  
Soichiro Hidaka ◽  
Tredej Toranawigtrai ◽  
...  
Keyword(s):  
Access Control ◽  
Control Method ◽  
Wireless Lans ◽  
Distributed Access Control
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