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Based on the working principle of the electrohydraulic proportional control system of the working device of the demolition robot, the co-simulation model of the system is established by means of ADAMS and MATLAB. The study of the dynamic characteristics of the system was done, with applying traditional PID control strategy and sliding mode variable structure control respectively, considering the change...
Model of a 300MW thermal power unit's governing system of steam turbine was established to analyze its load fluctuation during main steam valve activity test. The model contains three sub-models. They are model of turbine's governor during main steam valve activity test, model of governing valve, model of steam turbine considering governing valve's discharge characteristic. Based on the established...
Facing the energy crisis and environmental problems, saving energy of construction machinery, especially in the hydraulic excavator is very important. Regeneration of the potential energy is an effective solution to save energy. However, the conventional hybrid excavator can't regenerate the potential energy. This paper proposes a new structure of hydraulic excavator as well as a control strategy...
In this paper the nonlinear dynamics of a hydraulic system consisting of centrifugal pump, pressure accumulator and connected load are modeled and a Feedback Linearization controller is designed. Furthermore an Extended Kalman Filter is implemented to include the hydraulic dynamics into the estimation and simultaneously overcome the necessity of flow and pressure measurements. Therefore, the combined...
To improve low-speed stability and dynamic response of traditional variable speed pump control systems, this study proposes a variable speed pump control system in valve-pump parallel variable structure control, where a proportional flow valve is parallel to a variable speed pump and could work at leaking status and replenishing status, and then establishes its mathematical model and then analyses...
This paper presents a novel approach to the control of compressor systems used for the supply of fuel gas to gas turbines in combined cycle power plants. A model for the compression system is derived first and special attention is paid to an accurate description of the compressor map. Due to the strong coupling of the nonlinear dynamics of the compression system a nonlinear decoupling control concept...
This manuscript describes a study on primary spinning reserve scheduling in a 420 MW combined cycle power plant, conducted by a convenient use of Object-Oriented Modelling and Simulation (OOMS). This allowed to optimise the control system to comply with the network code requirements in the presence of dynamic constraints posed by the machinery. An accurate simulation model was tailored to represent...
The research object of this paper is negative control system in axial piston pump, which widely used in excavator. The control system changes the delivery of the pump by the complicated mechanism to realize the adjustment of the pump flow rate. This paper takes advantages of the AMESim and ADAMS to build the system hydraulic model and mechanical model separately, and lets them exchange data to complete...
Voice coil motor (VCM) is one of the linear electric machine which has faster transient response, higher accuracy. It is widely used in the field of high performance direct drive servo valve. The mathematic model of voice coil motor was analyzed and the position control system of direct driver valve that based on voice coil motor was designed. Against the disturbance in the system, a new position...
A motion simulator of deep-sea mining ship is designed for the 6000m deep-sea poly-metallic mining system, the control methods and the performance of the simulator are researched and tested. PID control is chosen. To determine PID control parameters, mathematical model of valve controlled cylinder system is established and validated by simulation tests. Based on the mathematical model, PID control...
Based on research of the phase plane division control method, according to the structure of wheel loader steer by wire system and its work condition, the fuzzy five states control system specially designed for wheel loader steer by wire system is introduced in this paper. To verify its performance, the controller was simulated in MATLAB/SIMULINK based on the model of wheel loader steer by wire system...
The dynamic model was established with the tool of ADAMS software for Coiler on the 1700 product line of a steel factory and AJC (Automatic Jumping Control) system model of wrapper equipment was built by AMESim software. Then the dynamic co-simulation of hydraulic, control and mechanical system was achieved. Based on the multiphase-match model, the jumping trace of the aid-roll, changing rules on...
The secondary regulation technology is a new energy saving hydraulic transmission technology, which can make several loads work parallel in a constant network system and very suitable for the drive axle test system. Secondary regulation load test of drive axle is a three axis loading system. The basic theory of the test system is analyzed, and the mathematic model of the secondary regulation is found...
The CANoe is adopted to finish the VRV-CAN network simulation system design so as to solve the problem of too many communication nodes, complex communication content within the system. The simulation procedure and means in CANoe are described with emphasis on the discussion of network architecture, communication protocol and network load ratio. The simulation results are presented. Through the system...
Automobile driveline test system is used to test and study the driveline components and assembly (DCA). This paper introduces the structure and principle of the test system, illuminates the application of frequency conversion technology in the test of the DCA. The drive system commands the drive motor to produce the necessary speed (RPM) and torque to simulate engine power. The actual driving resistances...
A newly assisted hydraulic circuit is proposed for a hydraulic transformer to improve energy saving potential of the system. The use of three directional controlled valves with the designed controller forces the transformer and the cylinder work in proper conditions, which contributes to improve energy utilization of the system. A model of hydraulic transformer including energy losses of the pump/motor...
In this paper, the mathematic models of the proportional amplifier and the electro-hydraulic proportional valve in a hydraulic control system of material piling and taking machine are built respectively by catalog and then the transfer Function of hydraulic cylinder and Load system is presented. The theory model of speed curve is put forward and several available speed curves are constructed in this...
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