scholarly journals Temperature compensation design and experiment for a giant magnetostrictive actuator

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhangrong Zhao ◽  
Xiaomei Sui
Keyword(s):  
Temperature Field ◽  
Temperature Control ◽  
Control Strategy ◽  
Cooling Water ◽  
Element Model ◽  
Control Device ◽  
Control Effect ◽  
Thermostatic Control ◽  
Magnetostrictive Actuator ◽  
Simulation Results

AbstractBecause the performance of giant magnetostrictive materials (GMMs) can vary at different temperatures, the positioning accuracy of a giant magnetostrictive actuator is affected by heat. In this work, a new simplified control strategy under compulsory water cooling is proposed to maintain a constant GMM temperature. Based on this strategy, a coupled turbulent flow field and temperature field finite element model is created for a GMM smart component. The model is simulated using COMSOL Multiphysics software version 5.3. Through simulations, the temperature field distribution of GMM smart components is analysed under different drive input currents and cooling water flow rates. Based on the obtained simulation results, a GMM intelligent component temperature control device is constructed. The experimental results are in good agreement with the simulation results; a thermostatic control effect is achieved in the thermostat of the giant magnetostrictive rod. Thus, the proposed temperature control strategy is proven effective via simulations and experiments.

scholarly journals Development of Body-Tissue Temperature-Control Transducer

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 14
Author(s):  
Audrone Dumciene ◽  
Saule Sipaviciene
Keyword(s):  
Temperature Field ◽  
Temperature Measurement ◽  
Field Distribution ◽  
Temperature Control ◽  
Material Properties ◽  
Tissue Temperature ◽  
Human Tissues ◽  
Temperature Field Distribution ◽  
Non Invasive ◽  
Simulation Results

The aim of this study was to develop a transducer for non-invasive temperature measurement in deeper tissue layers during tissue cooling. Simulation of the temperature field distribution in human tissues and the transducer were done, and the influence of transducer structure and material properties were studied. Using simulation results, the experimental transducer was designed for temperature measurement in deeper tissue layers during cooling. The temperature measurements with the needle thermometer and the transducer were well correlated at both before tissue cooling r = 0.723 and after cooling r = 0.945, and the temperature difference was no more than ±0.2 °C.

scholarly journals A New Seamless Transfer Control Strategy of the Microgrid

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Zhaoyun Zhang ◽  
Wei Chen ◽  
Zhe Zhang
Keyword(s):  
Control Strategy ◽  
Mode Conversion ◽  
Control Device ◽  
Control Logic ◽  
Mode Control ◽  
Control Scheme ◽  
Simulation Results ◽  
Seamless Transfer ◽  
And Control

A microgrid may operate under two typical modes; the seamless transfer control of the microgrid is very important. The mode conversion controller is installed in microgrid and the control logic of master power is optimized for microgrid mode conversion. In the proposed scheme, master power is very important. The master-power is under the PQ control when microgrid is under grid-connected. And it is under V/F control when the microgrid is under islanding. The microgrid mode controller is used to solve the planned conversion. Three types of conversion are simulated in this paper. The simulation results show the correctness and validity of the mode control scheme. Finally, the implementation and application of the operation and control device are described.

Temperature Control Technique and Analysis of Mass Concrete in the Pile Cap of Main Pier in Yangtze River Bridge

2014 ◽  
Vol 587-589 ◽  
pp. 1407-1411 ◽  
Author(s):  
Jun Su ◽  
Guo Wang Zuo ◽  
Wei Li
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Temperature Control ◽  
Yangtze River ◽  
Cooling Water ◽  
Control Technique ◽  
Mass Concrete ◽  
Element Analysis ◽  
Pile Cap ◽  
Calculation Results

The paper analyzed the temperature control technique measures of mass concrete in the pile cap of main pier in Yangtze River Bridge. Consider the effect of the cooling pipe, ANSYS finite element analytical software was used to calculate the temperature field of the pile cap in the construction, the distribution rules of the temperature field was simulated by finite element analysis. It is shown that the cooling effect of the mass concrete is obvious by using cooling water pipe, the finite element calculation results can be used to lead to the design and construction. It also provides the reference to develop a reasonable temperature control solutions during the construction of the similar mass concrete.

Temperature Field of Electro-Hydraulic Pump with Finite Element Model

2013 ◽  
Vol 373-375 ◽  
pp. 146-153
Author(s):  
Xiao Ning Zhang ◽  
Jing Xue ◽  
Yong Ling Fu ◽  
Zhu Feng Li
Keyword(s):  
Temperature Field ◽  
Heat Conduction ◽  
Thermal Model ◽  
Fluid Model ◽  
Element Model ◽  
Hydraulic Pump ◽  
Full Paper ◽  
Conduction Model ◽  
Depth Study ◽  
Simulation Results

Aim. The full paper begins with a variety of Electro-Hydraulic Pump (EHP) and a review on work of existing hydraulic pump, resulting in, in our opinion, the conclusion that it is absolutely essential to in-depth study on the EHP, a highly integration of electric motor and hydraulic pump. We now present a model how to get temperature field of our design plunger EHP that we believe that it can much better develop the EHP. In the full paper, we explain our method in some detail; in this abstract, we just add some pertinent remarks to naming the topics, such as motor thermal model, the fluid model and the heat conduction model. We discuss the temperature distribution under the different leakage decided by oil film thickness. Finally we do simulations in ANSYS. The simulation results in the full paper show our method for the temperature field is efficient to design the EHP.

The Temperature Control Simulation on Concrete Dam Simulation Analysis of the Concrete Block in First-Stage Water Cooling

2012 ◽  
Vol 462 ◽  
pp. 402-406
Author(s):  
Ying Bin Kang ◽  
Hui Xia Bian
Keyword(s):  
Temperature Field ◽  
Temperature Control ◽  
Simulation Analysis ◽  
Control Measure ◽  
Cooling Water ◽  
Concrete Block ◽  
Water Cooling ◽  
Concrete Dam ◽  
Cooling Pipe ◽  
Concrete Temperature

Control the concrete temperature to reduce the temperature cracks is one of the main tasks in the concrete dam construction. Water cooling is the most effective temperature control measure of concrete dam. In connection with the concrete temperature field of cooled computational problems, according to the water and heat exchange between the concrete and cooling water pipes, The cooling pipe is considered as the effect source of heat, and the effect of the water cooling is considered on average meaning, and then the approximate temperature field can be obtained through the finite element.

Simulation of Temperature Field in Selective Laser Sintering on PA6/Cu Composite Powders

2011 ◽  
Vol 213 ◽  
pp. 519-523 ◽  
Author(s):  
Jian Zhang ◽  
De Ying Li ◽  
Bin Qiu ◽  
Long Zhi Zhao
Keyword(s):  
Temperature Field ◽  
Selective Laser Sintering ◽  
Element Model ◽  
Laser Sintering ◽  
Moving Heat Source ◽  
Temperature Field Distribution ◽  
Forming Process ◽  
Composite Powders ◽  
Simulation Results ◽  
Thermal Physical Properties

The 3D transient finite element model in selective laser sintering is established based on ANSYS. The load of moving heat source at different time and locations are achieved by APDL and “element birth/death” technique, and the influence of convection, radiation, latent heat of phase change and thermal physical properties on temperature are taken into account. The temperature field distribution on time in forming process and temperature gradient distributions of pool cross-section are selectively studied, to provide theoretical basis for reasonable process parameters. The SLS experiment on PA6/Cu composite powders is carried out to verify the accuracy of simulation results.

Speed regulation control of tractors’ new dual-flow transmission system based on slip rate resistance classification

2021 ◽  
pp. 095440702110105
Author(s):  
Guang Xia ◽  
Yan Xia ◽  
Xiwen Tang ◽  
Linfeng Zhao ◽  
Baoqun Sun
Keyword(s):  
Control Strategy ◽  
Control Algorithm ◽  
Production Efficiency ◽  
Sliding Mode ◽  
Slip Rate ◽  
Speed Control ◽  
Working Environment ◽  
Vehicle Speed ◽  
Speed Change ◽  
Simulation Results

Fluctuations in operation resistance during the operating process lead to reduced efficiency in tractor production. To address this problem, the project team independently developed and designed a new type of hydraulic mechanical continuously variable transmission (HMCVT). Based on introducing the mechanical structure and transmission principle of the HMCVT system, the priority of slip rate control and vehicle speed control is determined by classifying the slip rate. In the process of vehicle speed control, the driving mode of HMCVT system suitable for the current resistance state is determined by classifying the operation resistance. The speed change rule under HMT and HST modes is formulated with the goal of the highest production efficiency, and the displacement ratio adjustment surfaces under HMT and HST modes are determined. A sliding mode control algorithm based on feedforward compensation is proposed to address the problem that the oil pressure fluctuation has influences on the adjustment accuracy of hydraulic pump displacement. The simulation results of Simulink show that this algorithm can not only accurately follow the expected signal changes, but has better tracking stability than traditional PID control algorithm. The HMCVT system and speed control strategy models were built, and simulation results show that the speed control strategy can restrict the slip rate of driving wheels within the allowable range when load or road conditions change. When the tractor speed is lower than the lower limit of the high-efficiency speed range, the speed change law formulated in this paper can improve the tractor speed faster than the traditional rule, and effectively ensure the production efficiency. The research results are of great significance for improving tractor’s adaptability to complex and changeable working environment and promoting agricultural production efficiency.

scholarly journals Investigation of the Thickness Differential on the Formability of Aluminum Tailor Welded Blanks

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 875
Author(s):  
Jie Wu ◽  
Yuri Hovanski ◽  
Michael Miles
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Numerical Model ◽  
Plastic Strain ◽  
Finite Element Model ◽  
Equivalent Plastic Strain ◽  
Element Model ◽  
Dome Height ◽  
Tailor Welded Blanks ◽  
Simulation Results

A finite element model is proposed to investigate the effect of thickness differential on Limiting Dome Height (LDH) testing of aluminum tailor-welded blanks. The numerical model is validated via comparison of the equivalent plastic strain and displacement distribution between the simulation results and the experimental data. The normalized equivalent plastic strain and normalized LDH values are proposed as a means of quantifying the influence of thickness differential for a variety of different ratios. Increasing thickness differential was found to decrease the normalized equivalent plastic strain and normalized LDH values, this providing an evaluation of blank formability.

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