AMESim Model Research Articles

Analysis and Simulation on Drive Characteristic of High-Strength Water Hydraulic Artificial Muscle

Driving processes and characteristics are different between the water hydraulic artificial muscle and pneumatic artificial muscle due to the difference of work media employed in muscles. An appropriative hydraulic circuit was designed to control the pressure of the water hydraulic artificial muscle and the performance of this system was analyzed. An AMESim model of the control system was built and the dynamic characteristics are analyzed with various parameters of the hydraulic circuit and various loads by simulation. The results show that the performance of the water hydraulic control valve should agree with the dimension of the water hydraulic artificial muscle. The rated flow rate of the water hydraulic valves can be selected increasingly while the load mass is low. Meanwhile, the overshoot is generated and enlarged along with the increases of the flow rate and load mass. These contribute to the improvements of designs and researches on control systems of water hydraulic artificial muscles.

Simulation on Linear-Motor-Driven Water Hydraulic Reciprocating Plunger Pump

The water hydraulic reciprocating plunger pump driven by linear motor is suitable to deep sea application with high efficiency and variable control. Aiming to study the principle structure and working characteristics of the pump, two patterns of valve and piston distribution were designed. And the control method and the performance were analyzed by simulation based on the AMESim model. The results show that the pressure and flow pulsation of piston type pump are much smaller than the valve type, even though the piston type is large in scale and works at low flow rate. Compared with a valve distribution tri-linear-motor reciprocating plunger pump (VDTLMP), as the flow rate of the piston distribution double linear motor reciprocating plunger pump (PDDLMP) is decreased from 36.7 L/min to 21.2 L/min theoretically, the pressure pulsation amplitude is decreased from 46% to 2%, and the flow pulsation rate is also decreased from 0.266 to 0.007. These results contribute to the research on deep-sea water hydraulic power pack and direct drive pump with high efficiency and energy conservation.

다이어프램형 밸브의 유량특성과 동적성능에 관한 연구

Solenoid valve has used in various industrial field extensively. A solenoid valve has different size, shape and method of operation accordantly to industrial field. Many researchers study on kinds of solenoid valve such as flow rate, dynamic, magnetic field, valve shape and operating method. But the flow rate characteristic and dynamic response time performance on the diaphragm valve are not studied. This paper describes the flow rate characteristic and dynamic response time performance on the diaphragm valve. At first, the diaphragm valve is simulated in AMESim simulation tool. AMESim model found that an effect of valve performance depends on parameter. The parameter is the diaphragm orifice area. And the performance test bench confirms the effect in this parameter. Finally, it finds out the flow rate characteristic and dynamic response time performance on the diaphragm valve.

Simulation and Optimal Control of AMT Starting-up Process

For a vehicle with 5-speed AMT (Automated Manual Transmission), AMESim model of the powertrain is set up, and comparison of simulation and experimental values is carried out to test the reliability of the simulation model. Through the co-simulation of AMESim and Simulink, we use optimal control and PID control respectively to control the starting process. The simulation result indicates that the optimal control strategy can satisfy the requirement for the drivability and smoothness.

A Research on Compressed Natural Gas Engine Fuel Supply System for Rapid Prototyping Based on AMEsim

AMESim model is on the basis of particular model gas engine fuel supply system. Elaborated the model in detail and made static and dynamic simulation. The static and dynamic characteristics curves of this system is got. Several important ideal structural parameters of this system were obtained. The results can be used for a theoretical basis for rapid prototyping and system structure optimization.

Water Hammer Characteristic of the Pipeline in Ship Pitch Balance System

In ship pitch balance system, serious flow impact and water hammer occur because of the turning on and off of valve during the procedure of water-shift. Flow area of the ball valve used most on ship was derived, and mathematical models of pressure lost before and after valve were formulated. Besides, considering the fact of water-shift balance system, an AMESim model was established based on improved traditional throttle model. And the validity of AMESim model was ascertained by comparing simulation results of stable pressure before and after valve with calculated values from mathematical models. Then, with the AMESim model, impact characteristics of water-shift pipeline were investigated when adopting various valve switch rules, length of pipelines before and after valve and using an accumulator in system. From that, methods to reduce pipeline impact were proposed, which make good references for noise control of ship pitch balance system.

The Modeling and Simulation of Two-Way Cartridge Check Valve Based on the AMESim

According to the structural characteristics and working principle of the two-way cartridge check valve, the static and dynamic characteristics are analysed, the AMESim model is built, and the dynamic simulation of analysis is investigated. Through analyzing the simulation results to prove the rationality of the model.

Simulation on an Experimental System for the Dynamic Characteristics of Safety Valves with High Pressure and Large Flow Rate

Safety valves play very important role in protecting the safety of hydraulic support in coal mine. However, its development is greatly limited by the corresponding test bench for the dynamic experiment. In this paper, an experimental system for testing the dynamic performance of the safety valve with rated pressure up to 50MPa and rated flow rate up to 2000L/min, is introduced. Based on AMEsim software, modeling and simulation on the designed system is carried out. Some parameters of the system are also analyzed and their influences to the tested valve’s dynamic performance are obtained by simulation. It is found that the designed system, which adopting the combination of a piston and a plunger cylindersas well as accumulators, can fulfill the demands of the relevant standard. Among all the investigated factors, both the volume and pre-charged gas pressure of the accumulators have optimum values matching with the other parameters of the system. The stroke of the plunger cylinder, the rated flow rates of the cartridge valve and its pilot control valve, are required to be higher than a certain value to avoid negative effects on the dynamic performance of the tested valve. The research presented in this paper is helpful to the design of the test system.

Research and Design for Relief Valve with Level 2 Pressure Regulating Based on AMEsim

By the relief valve with level 2 pressure regulating structures AMEsim model to analyze the impact of various factors on the valve dynamic performance reasons; optimize the parameters of these factors in the theoretical support and click here to design methods of productionthe product test verification. The results prove the effectiveness of the proceeds of the correctness of the simulation results and the valve design and production process.

Simulation Research on Test Platform of Wave Energy Hydraulic Conversion System in Laboratory Based on AMEsim

The test platform of wave energy hydraulic conversion system is built up in the laboratory, which used to analyze the factors affecting the efficiency of wave power generation under the premise of simulating actual working conditions at sea with the maximum extent possible. This paper described the basic components and established the AMEsim model of the test platform, while we simulated the test platform based on AMEsim and researched the dynamic characteristics of the test platform and analyzed the energy loss of the system.

Gear Shifting Control for Pure Electric Vehicle with Inverse-AMT

In this study, the gear shifting control strategy for pure electric vehicle with inverse automated manual transmission (I-AMT) is proposed. Based on a new drive train system of pure electric vehicle, an AMESim model of vehicle drive-train system is set up. Through the precise control of sliding sleeve, clutch engagement and separating time, gear shifting process is realized without driving torque interruption. The results show that, during up and down shift process, the driving torque keeps more than 50%, obviously improve the pure electric vehicle accelerating performance and the ability to climb.

Simulation and experiment research on the proportional pressure control of water-assisted injection molding

Water-assisted injection molding (WAIM), a newly developed fluid-assisted injection molding technology has drawn more and more attentions for the energy saving, short cooling circle time and high quality of products. Existing research for the process of WAIM has shown that the pressure control of the injecting water is mostly important for the WAIM. However, the proportional pressure control for the WAIM system is quite complex due to the existence of nonlinearities in the water hydraulic system. In order to achieve better pressure control performance of the injecting water to meet the requirements of the WAIM, the proportional pressure control of the WAIM system is investigated both numerically and experimentally. A newly designed water hydraulic system for WAIM is first modeled in AMEsim environment, the load characteristics and the nonlinearities of water hydraulic system are both considered, then the main factors affecting the injecting pressure and load flow rate are extensively studied. Meanwhile, an open-loop model-based compensation control strategy is employed to regulate the water injection pressure and a feedback proportional integrator controller is further adopted to achieve better control performance. In order to verify the AMEsim simulation results WAIM experiment for particular Acrylonitrile Butadiene Styrene (ABS) parts is implemented and the measured experimental data including injecting pressure and flow rate results are compared with the simulation. The good coincidence between experiment and simulation shows that the AMEsim model is accurate, and the tracking performance of the load pressure indicates that the proposed control strategy is effective for the proportional pressure control of the nonlinear WAIM system. The proposed proportional pressure control strategy and the conclusions drawn from simulation and experiment contribute to the application of water hydraulic proportional control and WAIM technology.

Kinetic Modeling Study of the Oxidation of Carbon Monoxide–Hydrogen Mixtures over Pt/Al2O3and Rh/Al2O3Catalysts

Detailed kinetic modeling was used to interpret the kinetics of the global CO + O2 reaction in the presence of hydrogen on Pt/Al2O3, Rh/Al2O3, and Pt/Rh/Al2O3 catalysts. The rate parameters were compiled from the literature and optimized to improve the predictivity against multiple experimental data sets. The intrinsic kinetics of CO oxidation in the presence of hydrogen was well described for Pt/Al2O3 and Rh/Al2O3 catalysts. On the basis of microkinetic studies, a global Langmuir–Hinshelwood rate expression for platinum and rhodium was derived. The resulting global rate was successfully implemented in the AMESim modeling platform. Both the detailed and global models predict correctly the CO conversion profiles and the enhancement effect of H2 to the CO light-off temperatures in the CO/O2/H2 system. This promoting effect is attributed to the surface reaction between CO(s) and OH(s) which represents an alternate way for consuming CO(s).

Study on Conveyor AMESim Model and Motor Starting Interval

This paper sets up a model of belt conveyor driven by two drive pulleys and three motors based on AMESim. The starting performance of conveyor is studied in three cases of motor starting interval: without time interval, with three second interval, and with five second interval. The conclusion is as following: the longer the time interval, the smaller the impact on the belt, and the acceleration of belt and gravity take-up. The simulation design suggests that three second interval and dual gravity take-ups should be taken. And the output torque of drive system should be reduced by 8—15%.

Extension of a kinetic model for NO oxidation and NOx storage to fixed-bed Pt/Ba/Al2O3 catalysts

Following our work on modeling of monolith catalysts, we herein focus on developing a fixed-bed reactor model in the AMESim modeling platform. A kinetic model for NO oxidn. and NOx storage over Pt/Ba/Al2O3 recently developed in the literature was successfully implemented and validated against the exptl. data available in the previous work of Scotti et al.. The oxidn.-storage model is capable of predicting NO and NO2 exptl. profiles. After validating, the model was used for sensitivity studies that revealed the important step in the oxidn.-storage mechanism. [on SciFinder(R)]

Intermittent-Chaos-and-Cepstrum-Analysis-Based Early Fault Detection on Shuttle Valve of Hydraulic Tube Tester

To ensure the safety and continuity of production, make a reasonable maintenance plan, and save the cost of maintenance for a hydraulic tube tester, it is needed to quickly identify an assignable cause of a fault. This paper is concerned with early fault detection of shuttle valves, which are the key components in hydraulic tube tester. An intermittent-chaos-and-cepstrum-analysis-based method is proposed to detect this early fault on the hydraulic tube tester. The presented approach is based on the insight that the phase transition of Duffing oscillator is very sensitive to a periodic weak signal having tiny angular frequency difference with the reference signal in this oscillator. Thus, to determine the angular frequency of the reference signal, cepstrum analysis is used to determine the eigenfrequency of the fault signal, and then, the angular frequency of the referential signal is computed according to this eigenfrequency. Finally, a Lyapunov exponent is introduced to realize computer observation of the shuttle valve early fault. The presented method is experimented with data simulated from an AMESim model of hydraulic tube tester. The results indicate that the proposed approach is capable of detecting the signal of shuttle valve early fault in the hydraulic tube tester.

Intermittent chaos and sliding window symbol sequence statistics-based early fault diagnosis for hydraulic pump on hydraulic tube tester

To ensure the safety, continuity of production, make a reasonable maintenance plan, save the cost of maintenance for hydraulic tube tester, it is needed to quickly identify an assignable cause of a fault. This paper is concerned with early fault diagnosis of hydraulic pump which are the heart of hydraulic tube tester. Considering that the signal of the hydraulic pump early fault is a periodic weak signal, an intermittent chaos, sliding window symbol sequence statistics-based method is proposed to detect the early fault of one single piston loose shoes of hydraulic pump on a hydraulic tube tester. The approach presented is based on the insight that the phase transition of chaos oscillator, for example, the Duffing oscillator, is very sensitive to a periodic weak signal having little angular frequency difference with the referential signal of the oscillator. While observing the intermittent chaos phenomenon through figure is not easy for computer, a sliding window symbol sequence statistics is developed to realize real-time computer observation of this phenomenon. Rather more, this paper takes a trick to decreasing the computational complexity of the sliding window symbol sequence statistics method, also analyzes the influences of different window size, depths of the symbol tree on the information entropy. At last, a control limit is introduced to realize automatic early fault alarm. The resultant approach is experimented with data simulated from an AMESim model of hydraulic tube tester. The results indicate that the proposed approach is capable of detecting the signal of hydraulic pump early fault on hydraulic tube tester.