Experimental Analysis of Heavy Vehicle Hydraulic Retarder during Downhill Driving

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Zhang Yong
Keyword(s):  
Traditional Method ◽  
Control Method ◽  
Heavy Vehicle ◽  
Control Effect ◽  
Poor Control ◽  
Braking Performance ◽  
Precise Control ◽  
Low Energy Consumption ◽  
Closed Structure ◽  
Hydraulic Retarder

The traditional control method of hydraulic retarder has poor control effect, and a precise control method of hydraulic retarder for heavy vehicle running downhill is proposed in this paper. The dynamics of heavy vehicle is analysed. According to the analysis, the auxiliary braking performance of hydraulic retarder is studied. The hydraulic retarder assembly with closed structure is designed. On this basis, the preliminary control and secondary control of the hydraulic retarder are carried out to realize its precise control. Experimental results show that the dynamic deviation of the retarder speed controlled by the proposed method is 45% lower than that of the traditional method. The proposed method has low energy consumption and strong feasibility.

Suppression of heavy-truck driver-seat vibration using sliding-mode control and quantitative feedback theory

2007 ◽  
Vol 221 (5) ◽  
pp. 769-779
Author(s):  
N. I. Rajapakse ◽  
G. S. Happawana ◽  
Y Hurmuzlu
Keyword(s):  
Sliding Mode Control ◽  
Control Method ◽  
Sliding Mode ◽  
Optimization Methods ◽  
Heavy Vehicle ◽  
Quantitative Feedback Theory ◽  
Mode Control ◽  
Smooth Tracking ◽  
Noise Amplification ◽  
Seat Vibration

The current paper presents a robust control method that combines sliding-mode control (SMC) and quantitative feedback theory (QFT) for designing a driver seat of a heavy vehicle to reduce driver fatigue. A mathematical model is considered to analyse tracking control characteristics through computer simulation in order to demonstrate the effectiveness of the proposed control methodology. The SMC is used to track the trajectory of the desired motion behaviour of the seat. However, when the system enters into sliding regime, chattering occurs owing to switching delays as well as vehicle system vibrations. The chattering is eliminated with the introduction QFT inside the boundary layer to ensure smooth tracking. Furthermore, using SMC alone requires higher actuator forces for tracking than using both the control schemes together, and causes various problems in selecting hardware. Problems with noise amplification, resonances, presence of uncertainties, and unmodelled high-frequency dynamics can largely be avoided with the use of QFT over other optimization methods. The main contribution of the present paper is to provide guidance in designing the controller to reduce heavy vehicle seat vibration so that the driver's sensation of comfort maintains a certain level at all times.

Multisensor information-based adaptive control method for cutting head speed of roadheader

2020 ◽  
pp. 095440622095249
Author(s):  
Pengjiang Wang ◽  
Yang Shen ◽  
Rui Li ◽  
Kai Zong ◽  
Shichen Fu ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Control Method ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Fuzzy Logic Controllers ◽  
Control Effect ◽  
Cutting Efficiency ◽  
Cutting Head ◽  
Pi Controllers ◽  
Particle Swarm Optimisation Algorithm

An adaptive control method to improve the cutting head speed of roadheaders using multisensor information is proposed, so as to solve the problems of low cutting efficiency and low intelligence of roadheaders during underground tunnelling. The operation of a roadheader is analysed, and a control strategy for its cutting head speed is proposed. In addition, the cutting head speed is categorised into five gears according to the multisensor information of different cutting states. The controller for speed estimation is designed using a back propagation neural network optimised using an improved particle swarm optimisation algorithm. A control system is established in MATLAB to analyse the effectiveness of the method. The simulation results show that an IPSO-BP controller has the best control effect and can attain the target speed. The response time was lower than those of fuzzy logic controllers and traditional PI controllers by 46% and 68%, respectively, and the overshoot decreased by 4.69% and 12.19%, respectively. Furthermore, experimental research verified the effectiveness of this method. This method can adaptively adjust the cutting head speed of a roadheader using multisensor information and is important (both theoretical and practically) for extending the service life of roadheaders and improving tunnelling efficiency.

Multivariable predictive functional control of a compound power-split hybrid electric vehicle

2021 ◽  
pp. 095440702110466
Author(s):  
Ji Gao ◽  
Diming Lou ◽  
Tong Zhang ◽  
Liang Fang ◽  
Yunhua Zhang
Keyword(s):  
Hybrid System ◽  
Hybrid Electric Vehicle ◽  
Control Method ◽  
Multiple Input Multiple Output ◽  
Area Network ◽  
Control Effect ◽  
Decoupling Method ◽  
Input Multiple Output ◽  
Objective Control ◽  
Pure Delay

The Corun hybrid system (CHS) is a deeply coupled multiple-input–multiple-output (MIMO) hybrid system. The two inputs are the torques of the two motors. The two outputs are the carrier speed and transmission output torque. Using the traditional control method, the multi-objective control quality cannot be guaranteed because of the adopted static decoupling method and proportional–integral–derivative (PID) controllers. In this paper, the problems of the traditional control method are carefully analyzed, and a new control method is proposed. Instead of static decoupling, dynamic decoupling is adopted to improve the decoupling control effect. A predictive functional controller instead of a PID controller is adopted to deal with the pure delay caused by controller area network (CAN) communication. The tracking effect of the target value is further improved by predictive functional controllers. For the two decoupled subsystems, that is, the integral system and the second-order underdamped system, two predictive functional controllers are designed. The new control method was verified by simulations and tests. The results show that the new control method is superior to the traditional control method for CHS.

scholarly journals Strategy of Rainwater Discharge in Combined Sewage Intercepting Manhole Based on Water Quality Control

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 898 ◽  
Author(s):  
Zhongqing Wei ◽  
Xiangfeng Huang ◽  
Lijun Lu ◽  
Haidong Shangguan ◽  
Zhong Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Control ◽  
Control Strategies ◽  
Oxygen Demand ◽  
Water Volume ◽  
Urban Drainage ◽  
Sewage Pollution ◽  
Control Effect ◽  
Poor Control ◽  
Water Quality Control

In view of problems such as the poor control effect of combined sewage pollution caused by traditional intercepting weir and the limited extension of the urban drainage model, which needs a large amount of basic data, this paper not only studied the characteristics of mixed-flow pollution via the urban drainage model but also simulated and optimized 6 interception control strategies and proposed a water quality interception strategy based on the pollution concentration of combined sewage. The results showed that, compared with the traditional interception weir, the interception control strategy of rainwater discharge based on the mixed pipe network model can obviously improve the control rate of various pollutants and reduce the interception amount required for pollution control. Through optimization of the interception based on water quality control by the combination of chemical oxygen demand (COD) and NH4-N, the interception rate was improved by 10.9% to 56.1% in contrast to the traditional interception weir and the closure water volume was reduced by 1432–6154 m3, which effectively improved the reliability and economy of the interception.

Braking characteristics integrating open working chamber model and hydraulic control system model in a hydrodynamic retarder

2018 ◽  
Vol 233 (6) ◽  
pp. 1952-1971 ◽  
Author(s):  
Hongbin Mu ◽  
Wei Wei ◽  
Lingxing Kong ◽  
Yulong Zhao ◽  
Qingdong Yan
Keyword(s):  
Control System ◽  
System Integration ◽  
Control Method ◽  
Control Parameters ◽  
Hydraulic Control ◽  
Braking Performance ◽  
Working Chamber ◽  
Braking Torque ◽  
Open Working ◽  
Hydraulic Control System

Hydraulic control system has important influence on the steady and transient braking performance of a hydrodynamic retarder. The braking characteristics of hydrodynamic retarder regulated by hydraulic control system should be investigated first, before designing and making the braking strategy and control method. The accurate and detailed braking characteristics models of open working chamber and hydraulic control system are established, integrated, and validated by steady and dynamic experimental data. Based on full factorial design experimental method, the influence of control parameters on braking performance achieving steady state is analyzed with parameter sensitivity, and the effect of control parameters on braking response characteristics is conducted. Then the influence of different tube lengths between working chamber and hydraulic control system on braking performance is discussed and analyzed. The results show the control pressure and rotor rotational speed both have significant impact on braking characteristics with obvious nonlinear, coupling, and interaction effect. The longer response time of hydraulic control system will be for the larger braking torque. Shortening the tube lengths as much as possible is needed to improve the braking torque, cooling flow rate, and system integration.

Control of Vortex Shedding Using a Screen Attached on the Separation Point of a Circular Cylinder and Its Effect on Drag

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Gokturk Memduh Ozkan ◽  
Erhan Firat ◽  
Huseyin Akilli
Keyword(s):  
Circular Cylinder ◽  
Surface Area ◽  
Vortex Shedding ◽  
Control Method ◽  
Separation Point ◽  
Whole Body ◽  
Cylinder Surface ◽  
Control Effect ◽  
Permeable Plate ◽  
Turbulent Statistics

The control of flow in the wake of a circular cylinder by an attached permeable plate having various porosity ratios was analyzed experimentally using both particle image velocimetry (PIV) and dye visualization techniques. The force measurements were also done in order to interpret the effect of control method on drag coefficient. The diameter of the cylinder and length to diameter ratio of the plate were kept constant as D = 50 mm and L/D = 1.0, respectively. The porosity ratio, β, which can be defined as the ratio of open surface area to the whole body surface area, was taken as β = 0.4, 0.5, 0.6, 0.7, and 0.8 (permeable plates). The study was performed considering deep water flow conditions with a constant Reynolds number of ReD = 5000 based on the cylinder diameter. Each permeable plate was attached on the separation point and the results were compared with the results of cylinder without permeable plate (plain cylinder) in order to understand the control effect. Both qualitative and quantitative results revealed that the permeable plates of 0.4 ≤ β ≤ 0.6 are effective on controlling the unsteady flow structure downstream of the cylinder, i.e., the vortex formation length was increased, turbulent statistics was reduced and vortex shedding frequency was diminished when the permeable plate attached normal to the cylinder surface from the lower separation point. However, the drag force acting on the cylinder was found to be increased due to the increased cross-sectional area.

Designed of Wireless Intellectualized Temperature Control System in Tobacco Preserve Based on Fuzzy-PID

2013 ◽  
Vol 416-417 ◽  
pp. 890-894
Author(s):  
Xiao Hui Guo
Keyword(s):  
Temperature Control ◽  
Control Method ◽  
Control Function ◽  
Temperature Control System ◽  
Pid Controllers ◽  
Fuzzy Pid ◽  
Single Chip ◽  
Control Effect ◽  
Set Up ◽  
The Individual

Tobacco Warehousing is chiefly applied to preserve the tobacco that is separated into leaf and stem so that the tobacco moisture is controlled at the range of technology demand.The present control method of tobacco save is that the references of every PID control link are set up and adjusted by human experience. So, the control effect varies with the individual and the output tobacco moisture can't maintain stable.The fuzzy-PID temperature system is based on CC2430 single chip. It includes the power source, the manipulative algorithm, the temperature examination , the correspondence of up PC and the output-control of the switch value and so on. Computer takes the parameter deviation and the deviation change as input, and the PID controllers parameters of ΔKp, Δki, ΔKd as output. The sub program realized the corresponding events by completing zone bit and zone bit judgment. The main program realized temperature control function by calling the wireless micro-controller sends a signal to the charged unit

Vibration Performance Optimization of the Semi-Active Suspension with Fuzzy Control Method

2012 ◽  
Vol 468-471 ◽  
pp. 1123-1127
Author(s):  
Jin Ning Zhi ◽  
Jian Wei Yang ◽  
Jun Zhe Dong
Keyword(s):  
Fuzzy Control ◽  
Dynamic Load ◽  
Performance Optimization ◽  
Ride Comfort ◽  
Control Method ◽  
Heavy Vehicle ◽  
Variable Universe ◽  
Suspension Parameters ◽  
Variable Universe Fuzzy Control ◽  
Five Axis

In order to improve the dynamic performance of five-axis heavy vehicle, a variable universe fuzzy control method is proposed to optimize suspension parameters. Five-axis multi-body dynamic model including electro-hydraulic proportional valve was firstly established in software ADAMS/Car. The variable universe fuzzy controller based on fuzzy neural network was also designed in MATLAB/Simulink, and then the co-simulation was conducted. The dynamic characteristics of five-axis heavy vehicle are studied to verify the effect of suspension parameters optimized by variable universe fuzzy control method in the A, B and C-level random pavement and different speed conditions. Simulation results show that compared with passive suspension, the real-time optimization of variable fuzzy control based on FNN can improve the ride comfort and the dynamic load of tire. Under different driving conditions, ride comfort can be increased by about 25%-30%, and the dynamic load of tire generally decreases by 25%-35%. Therefore this method has a certain practicability and effectiveness.

Study on Leakage Loss Control Method of Circumferential Bending Clearance

2019 ◽  
Author(s):  
Shuai Jiang ◽  
Fu Chen ◽  
Jianyang Yu ◽  
Shaowen Chen ◽  
Yanping Song
Keyword(s):  
Control Method ◽  
Incidence Angle ◽  
Leading Edge ◽  
Blocking Effect ◽  
Field Analysis ◽  
Leakage Flow ◽  
Turbine Cascade ◽  
Tip Leakage Flow ◽  
Control Effect ◽  
Tip Leakage

Abstract The concept of circumferential bending clearance based on Gauss Bimodal Function is proposed to suppress tip leakage flow (TLF) in a highly-loaded turbine cascade. In this method, a new vortex (BV) can be induced to mix with TLV in the middle of tip region and block the development of tip leakage vortex (TLV). Since the blocking effect divides the TLV into two parts, the tip leakage rate and loss of TLF can be reduced significantly. In order to reveal the mechanisms of blocking effect on leakage flow and its influencing factors, the research numerically investigates the effects of environmental conditions on the TLF development in a turbine cascade. The flow field analysis of the optimal bending clearance is in the first place, and then the effects of clearance heights (δ) and incidence angles (α) on the TLF characteristic and loss are investigated respectively. Results indicate that the blocking effect has a close relationship with the TLF characteristic, which can be divided into the BV migration, TLV-2 location and blocking loss. The nearer distance to the leading edge (LE) and farther distance to the suction side (SS) of BV means a less loss of TLF in bending clearance cases. The further distance away from blade tip and SS of TLV-2 means a larger-scale vortex with more loss. The additional loss in blocking region expands constantly with the increase of clearance height and incidence angle. The bending clearance has limited control effect on TLF with the variation of clearance height, especially the loss increases in Case 2%H. However, it has a strong adaptability with the change of incidence angle, the relative total pressure loss drops up to 16% in Case −5°.

Iterative learning control of robot based on artificial bee colony algorithm

2019 ◽  
Vol 233 (9) ◽  
pp. 1221-1238
Author(s):  
Wanqiang Xi ◽  
Yaoyao Wang ◽  
Bai Chen ◽  
Hongtao Wu
Keyword(s):  
Iterative Learning Control ◽  
Degrees Of Freedom ◽  
Artificial Bee Colony Algorithm ◽  
Artificial Bee Colony ◽  
Control Method ◽  
Learning Control ◽  
Iterative Learning ◽  
Industrial Robots ◽  
Control Effect ◽  
Bee Colony

For the repetitive motion control, inaccurate model, and other issues of industrial robots, this article presents a novel control method that the proportion differentiation-type iterative learning parameters are self-tuning based on artificial bee colony algorithm. Considering the influence of the numerical value of iterative learning parameters on the control system, especially in the early iteration, the control effect is not satisfactory. Thus, the artificial bee colony algorithm is introduced in this article. Using bee colony as search unit, the parameters in iterative learning are optimized through the exchange of information and the survival of fittest between them. And then the optimized results are returned to iterative learning control algorithm. Finally, the digital simulation of a two-degrees-of-freedom manipulator and the experimental verification of a cable-driven robot with its first two joints are carried out. The results show that the iterative learning control based on the artificial bee colony algorithm has faster convergence and better control effect than the iterative learning control with fixed parameters.

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