scholarly journals Inverse Model for the Control of Induction Heat Treatments

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2826 ◽  
Author(s):  
Asadzadeh ◽  
Raninger ◽  
Prevedel ◽  
Ecker ◽  
Mücke
Keyword(s):  
Power Level ◽  
Measurement Data ◽  
Heat Treatments ◽  
Cylindrical Sample ◽  
Inverse Model ◽  
Test Rig ◽  
Induction Heat ◽  
Current Frequency ◽  
Dependent Parameter ◽  
Heating Test

In this work, we present and test an approach based on an inverse model applicable to the control of induction heat treatments. The inverse model is comprised of a simplified analytical forward model trained with experiments to predict and control the temperature of a location in a cylindrical sample starting from any initial temperature. We solve the coupled nonlinear electromagnetic-thermal problem, which contains a temperature dependent parameter α to correct the electromagnetic field on the surface of a cylinder, and as a result effectively the modeled temperature elsewhere in the sample. A calibrated model to the measurement data applied with the process information such as the operating power level, current, frequency, and temperature provides the basic ingredients to construct an inverse model toolbox, which finally enables us to conduct experiments with more specific goals. The input set values of the power supply, i.e., the power levels in the test rig control system, are determined within an iterative framework to reach specific target temperatures in prescribed times. We verify the concept on an induction heating test rig and provide two examples to illustrate the approach. The advantages of the method lie in its simplicity, computationally cost effectiveness and independence of a prior knowledge of the internal structure of power supplies.

The growth behavior of columnar grains in a TiAl alloy during directional induction heat treatments

CrystEngComm ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 1188-1196 ◽  
Author(s):  
Yangli Liu ◽  
Xiang Xue ◽  
Hongze Fang ◽  
Yingmei Tan ◽  
Ruirun Chen ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Tial Alloy ◽  
Heat Treatments ◽  
Growth Behavior ◽  
Interface Tension ◽  
Induction Heat ◽  
Columnar Grains

In the process of DHT, the curving grain boundary will move towards curvature center of grain under the action of interface tension.

scholarly journals Identification Procedures as Tools for Fault Diagnosis of Rotating Machinery

1995 ◽  
Vol 1 (3-4) ◽  
pp. 267-275 ◽  
Author(s):  
Susanne Seibold ◽  
Claus-Peter Fritzen
Keyword(s):  
Fault Detection ◽  
Crack Depth ◽  
Measurement Data ◽  
Normal Operation ◽  
Suitable Model ◽  
Test Rig ◽  
System Diagnosis ◽  
Jeffcott Rotor ◽  
Identification Procedures

System identification procedures offer the possibility to correct erroneous models, based on measurement data. Recently, this conventional field of application is being extended to fault detection and system diagnosis. In contrast to conventional approaches, identification procedures try to establish an unequivocal relation in between the damage and specific mechanical parameters, based on a suitable model. Furthermore, they can be employed during normal operation of the machinery. In this paper, several identification procedures on the basis of the Extended Kalman Filter are introduced and employed for model-based fault detection. Their feasability is proved by several examples. First, it is shown that the crack depth of a simulated Jeffcott-rotor can be calculated correctly. Then, the procedures are utilized to determine the crack depth of a rotor test rig. Finally, it is proved that identification procedures can be employed for the determination of unbalances without having to apply test masses.

scholarly journals Mathematical Modelling of Biomechanical Interactions between Backpack and Bearer during Load Carriage

2013 ◽  
Vol 2013 ◽  
pp. 1-12
Author(s):  
Lei Ren ◽  
David Howard ◽  
Richard K. Jones
Keyword(s):  
Mathematical Model ◽  
Mathematical Modelling ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Measurement Data ◽  
Load Carriage ◽  
Human Gait ◽  
Test Rig ◽  
Interaction Forces ◽  
Suspension Model

This paper proposes a three-dimensional mathematical model of the biomechanical interactions between backpack and bearer during load carriage. The model considers both the coupled pack motions, which follow the torso, and also the longitudinal compliance and damping in the backpack suspension. The pack interaction forces and moments, acting on the bearer, are determined from kinematic relationships, equations of motion, and a dynamic pack suspension model. The parameters of the pack suspension model were identified from test data obtained using a load carriage test rig. Output from the load carriage mathematical model has been compared with measurement data during human gait and conclusions drawn with regard to the validity of the proposed approach.

Validation of a T100 Micro Gas Turbine Steady-State Simulation Tool

2015 ◽  
Author(s):  
Martin Henke ◽  
Nikolai Klempp ◽  
Martina Hohloch ◽  
Thomas Monz ◽  
Manfred Aigner
Keyword(s):  
Numerical Simulation ◽  
Steady State ◽  
Gas Turbines ◽  
Power Plants ◽  
Numerical Models ◽  
Measurement Data ◽  
Cycle Performance ◽  
Simulation Tool ◽  
Test Rig ◽  
Cycle Simulation

Micro gas turbines (MGT) provide a highly efficient, low-pollutant way to generate power and heat on-site. MGTs have also proven to be a versatile technology platform for recent developments like utilization of fuels with low specific heating values and solar thermal electricity generation. Moreover, they are the foundation to build novel cycles like the inverted Brayton cycle or fuel cell hybrid power plants. Numerical simulations of steady operation points are beneficial in various phases of MGT cycle development. They are used to determine and analyze the future potentials of innovative cycles for example by predicting the electrical efficiency and they support the thermodynamic design process (by providing mass flow, pressure and temperature data). Numerical Simulation allows to approximate off-design performance of known cycles e.g. power output at different ambient conditions. Additionally, numerical simulation is used to support cycle optimization efforts by analyzing the sensitivity of component performance on cycle performance. Numerical models of the MGT components have to be tuned and validated based on experimental data from MGT test rigs. At DLR institute of combustion technology a MGT steady-state cycle simulation tool has been used to analyze a variety of cycles and has been revised for several years. In this paper, the validation process is discussed in detail. Comparing simulation data with measurement data from the DLR Turbec T100 test rig has led to extensions of the numeric models, on the one hand, and to modifications of the test rig on the other. Newly implemented numerical models account for the generator heat release to the inlet air and the power electronic limitations. The test rig was modified to improve the temperature measurement at positions with uneven spatial temperature distribution such as the turbine outlet. Analyzing these temperature distributions also yields a possible explanation for the apparent strong recuperator efficiency drop at high load levels, which was also observed by other T100 users before.

Flow Analysis in Gas Turbine Pre-Swirl Cooling Air Systems: Variation of Geometric Parameters

2006 ◽  
Author(s):  
K. Jarzombek ◽  
H. J. Dohmen ◽  
F.-K. Benra ◽  
O. Schneider
Keyword(s):  
Flow Analysis ◽  
Measurement Data ◽  
Numerical Results ◽  
Geometric Parameters ◽  
Test Rig ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Cooling Air ◽  
Cavity Width ◽  
Good Agreement

This paper reports experimental and numerical results of the flow in a high radius pre-swirl system. Numerical results have been compared with measurement data for the investigated test rig and are in good agreement with the experimental results. To get a better understanding of the flow structure and the influence of geometric parameters in pre-swirl systems, variations were performed by 3D-CFD simulations on a derived and simplified model. Variations of radius ratio of pre-swirler to receiver, the pre-swirl cavity height and the pre-swirl cavity width are shown. The influencing effects of the varied parameters are shown by looking at pre-swirl effectiveness and total pressure losses.

scholarly journals The Art of Electrosurgery: Trainees and Experts

2017 ◽  
Vol 24 (4) ◽  
pp. 373-378 ◽  
Author(s):  
Frédérique C. Meeuwsen ◽  
Annetje C. P. Guédon ◽  
Ewout A. Arkenbout ◽  
Maarten van der Elst ◽  
Jenny Dankelman ◽  
...  
Keyword(s):  
Best Practice ◽  
Power Level ◽  
Measurement Data ◽  
Well Being ◽  
Reliable Estimate ◽  
Activation Time ◽  
Practice Model ◽  
Instrument Selection ◽  
Application Techniques ◽  
Activation Times

The benefits of electrosurgery have been acknowledged since the early 1920s, and nowadays more than 80% of surgical procedures involve devices that apply energy to tissues. Despite its widespread use, it is currently unknown how the operator’s choices with regard to instrument selection and application technique are related to complications. As such, the manner in which electrosurgery is applied can have a serious influence on the outcome of the procedure and the well-being of patients. The aim of this study is to investigate the variety of differences in usage of electrosurgical devices. Our approach is to measure these parameters to provide insight into application techniques. A sensor was developed that records the magnitude of electric current delivered to an electrosurgical device at a frequency of 10 Hz. The sensor is able to detect device activation times and a reliable estimate of the power-level settings. Data were recorded for 91 laparoscopic cholecystectomies performed by different surgeons and residents. Results of the current measurement data show differences in the way electrosurgery is applied by surgeons and residents during a laparoscopic cholecystectomy. Variations are seen in the number of activations, the activation time, and the approach for removal of the gallbladder. Analysis showed that experienced surgeons have a longer activation time than residents (3.01 vs 1.41 seconds, P < .001) and a lower number of activations (102 vs 123). This method offers the opportunity to relate application techniques to clinical outcome and to provide input for the development of a best practice model.

scholarly journals Optimization of inverse model identification for multi-axial test rig control

2016 ◽  
Vol 42 ◽  
pp. 01002 ◽  
Author(s):  
Tino Müller ◽  
Johannes Ziegmann ◽  
Simon Krüner ◽  
Christian Endisch
Keyword(s):  
Model Identification ◽  
Inverse Model ◽  
Test Rig

Accuracy Analysis of the K&C Test-Rig Measuring System

2013 ◽  
Vol 333-335 ◽  
pp. 248-253
Author(s):  
Li Hao Zhang ◽  
Kong Hui Guo ◽  
Shu Qi Chen
Keyword(s):  
Measurement Data ◽  
Measuring System ◽  
Accuracy Analysis ◽  
Test Rig ◽  
Angle Sensor ◽  
Simulation Accuracy ◽  
Machining Errors ◽  
Body Dynamics ◽  
Multi Body ◽  
Measuring Plate

Target parameters of the K&C test-rig is introduced in this paper. Establish McPherson independent suspension and K&C test-rig multi-body dynamics model .The measurement data of angle sensors is obtained in the wheel travel simulation. Accuracy analysis of target parameters when there are machining errors, installation errors and calibration errors in the measuring system. Accuracy analysis of target parameters when using the different measurement precision angle sensor. Comprehensively consideration of the measuring system all error factors, the accuracy is analyzed. The coordinate error of the installation point between measuring plate and the hub has greater effect on the toe and camber calculation.

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