Test Machine and Control System Interactions in the Evaluation of Rate-Dependent Metal Flow

1993 ◽  
Vol 115 (2) ◽  
pp. 179-186 ◽  
Author(s):  
S. B. Brown ◽  
V. R. Dave
Keyword(s):  
Control System ◽  
Dynamic Response ◽  
Mechanical Test ◽  
Metal Flow ◽  
Test System ◽  
Rate Change ◽  
Test Machine ◽  
Strain Rate Change ◽  
Rate Dependent ◽  
And Control

Although rate-change experiments are essential for characterizing rate-dependent flow, certain nonobvious aspects of test machine dynamic response and control system strategies can distort rate-change data. These distortions are large enough to cause rate-change experiments to characterize the test system dynamic response instead of the test material’s rate dependence. We demonstrate that both relaxation and strain rate change experiments exhibit this potential distortion of test data. Investigators performing these experiments must therefore examine control error carefully to assure that the experiments are valid. We demonstrate that the standard PID control modes normally used in servocontrolled mechanical test equipment will generate error. Either P or PD control modes are more appropriate for rate-change experiments.

Development of a Ring Permeability Test System

2010 ◽  
Vol 136 ◽  
pp. 153-157
Author(s):  
Yu Hong Du ◽  
Xiu Ming Jiang ◽  
Xiu Ren Li
Keyword(s):  
Control System ◽  
Control Method ◽  
Dynamic Performance ◽  
Experimental Tests ◽  
Measuring Method ◽  
Test System ◽  
Fluid Theory ◽  
And Control ◽  
Relationship Of ◽  
The Mathematical Model

To solve the problem of detecting the permeability of the textile machinery, a dedicated test system has been developed based on the pressure difference measuring method. The established system has a number of advantages including simple, fast and accurate. The mathematical model of influencing factors for permeability is derived based on fluid theory, and the relationship of these parameters is achieved. Further investigations are directed towards the inherent characteristics of the control system. Based on the established model and measuring features, an information fusion based clustering control system is proposed to implement the measurement. Using this mechanical structure, a PID control system and a cluster control system have been developed. Simulation and experimental tests are carried out to examine the performance of the established system. It is noted that the clustering method has a high dynamic performance and control accuracy. This cluster fusion control method has been successfully utilized in powder metallurgy collar permeability testing.

Coherence Analysis and Control of Multi-Exciter Vibration Test System

2013 ◽  
Vol 401-403 ◽  
pp. 1005-1009
Author(s):  
Zheng Tao Yan ◽  
Shao Chun Ding
Keyword(s):  
Control System ◽  
System Development ◽  
Response Spectrum ◽  
Test System ◽  
Partial Coherence ◽  
Vibration Test ◽  
Test Field ◽  
And Control ◽  
Drive Signals ◽  
Test Control

Multi-exciter vibration test control system is the core of the multiple shaker vibration test, and multi-exciter vibration test control technology has become the hot point of vibration test field. Based on coherence principles, the coherence of two exciters control system was tested, the introduction of noise signal reduces the control coherence between the response spectrum and partial coherence between response and the corresponding drive signal. By means of increasing the coherence between drive signals, the control coherence between the response spectrum can be raised and control performance of system can be Improved. The above means could provide technical support for multi-exciter vibration test system development.

Application of LabVIEW in HPS Synthetical Testing System

2013 ◽  
Vol 850-851 ◽  
pp. 751-754
Author(s):  
Yong Liu
Keyword(s):  
Control System ◽  
Test System ◽  
Software Test ◽  
Testing System ◽  
Test Rig ◽  
Measurement And Control System ◽  
Power Steering ◽  
And Control ◽  
Measurement And Control

In this paper, we research on HPS synthetical testing system based on LabVIEW, and put forward the whole scheme of power steering gear assembly test rig system. The PC application of measurement and control system is designed based on LabVIEW 8.5. The results of experimental show that our software test system is stable and effective.

Fatigue Test System for Accumulators

2013 ◽  
Vol 303-306 ◽  
pp. 1272-1275
Author(s):  
Jing Ping Leng ◽  
Jian Jin ◽  
Ke Li Xing
Keyword(s):  
Control System ◽  
Fatigue Test ◽  
Hydraulic System ◽  
Energy Recovery ◽  
Test System ◽  
Test Method ◽  
Hardware System ◽  
Test Requirements ◽  
Upper Computer ◽  
And Control

An energy recovery and high effective fatigue test system for accumulators has been developed through the improvement of test method JB-T 7037-2006 and test requirements JB-T 7036-2006 [1][2]. The test system contains hydraulic system and control system. The hardware system of control system is based on IPC as upper computer and PLC as lower computer, while the software system is based on Borland C++ Builder 6.0, which can realize collecting and saving the field data, drawing and saving testing curve, and generating export.

HISTORICAL REVIEW OF RESEARCH AND DEVELOPMENT OF THE SHPB METHOD IN JAPAN

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1269-1276 ◽  
Author(s):  
KINYA OGAWA
Keyword(s):  
Dynamic Response ◽  
Research And Development ◽  
Strain Rate ◽  
Historical Review ◽  
Rate Change ◽  
Wave Method ◽  
Strain Rate Change ◽  
Bending Tests ◽  
Points Of View ◽  
Strain Rate Change Test

Historical review of research and development of the SHPB method in Japan is outlined. After introduction of the SHPB in early 1960s, various kinds of compression, tension, torsion and bending tests have been performed in Japan and are presently shown together with special techniques such as the strain rate change test and the ramped wave method. Applications of the SHPB method to characterize dynamic response of materials from various points of view are also described in connection with its flexibility and simplicity. Current activities related to the SHPB method are briefly explained.

Study on the Automatic Test Device of Airflow Performance in Refrigerator Transportation Vehicle

2013 ◽  
Vol 770 ◽  
pp. 59-63
Author(s):  
Jia Min Wang ◽  
Li Juan Li ◽  
Xin Xin Zhao ◽  
Chuan Zhen Huang ◽  
Zhao Liang Jiang
Keyword(s):  
Control System ◽  
Wind Speed ◽  
Can Bus ◽  
Test System ◽  
Automatic Test ◽  
Test Device ◽  
Automatic Test System ◽  
Transportation Vehicle ◽  
Design And Manufacture ◽  
And Control

In order to test the environment inside the refrigerator transportation vehicle, a automatic test system of airflow performance is built based on monitor and control system of CAN bus. The parameters of flow field such as humiture, wind speed, wind direction and pressure can be collected movably, processed and monitored in realtime with the proposed system, which is helpful for the design and manufacture of refrigerator transportation vehicle.

Modeling and control of a 2-degree-of-freedom gyro-stabilized platform driven by ultrasonic motors

2018 ◽  
Vol 29 (11) ◽  
pp. 2324-2332 ◽  
Author(s):  
Song Pan ◽  
Yipeng Wu ◽  
Jianhui Zhang ◽  
Shengqiang Zhou ◽  
Hua Zhu
Keyword(s):  
Control System ◽  
Dynamic Response ◽  
Ultrasonic Motor ◽  
Degree Of Freedom ◽  
Modeling And Control ◽  
Ultrasonic Motors ◽  
Motor Controller ◽  
Stabilized Platform ◽  
Differential Control ◽  
And Control

This article specially designed and demonstrated a new ultrasonic motor and its control system based on the dynamic model of the 2-degree-of-freedom gyro-stabilized platform. The factors such as mechanical resonance, torque and moment inertia coupling, and nonlinearity of the driver were also taken into account during the optimization of the robust proportional–integral–differential control system. Finally, the controller was implemented by an ultrasonic motor and an embedded microcontroller. Experimental results showed that, comparing with the traditional electromagnetic motor controller, the proposed ultrasonic motor controller had the better control performances in dynamic response, static accuracy, isolation, and so on. A practical prototype of the gyro-stabilized platform with stronger robustness was also developed at the same time.

Development of a Jacobian Module for Advanced Pulp and Paper Simulation and Control

TAPPI Journal ◽  
2009 ◽  
Vol 8 (1) ◽  
pp. 4-11
Author(s):  
MOHAMED CHBEL ◽  
LUC LAPERRIÈRE
Keyword(s):  
Control System ◽  
Nonlinear Behavior ◽  
Simulation Software ◽  
Pulp And Paper ◽  
Pid Controllers ◽  
Tuning Parameters ◽  
Pid Tuning ◽  
Fixed Set ◽  
And Control ◽  
Operating Points

Pulp and paper processes frequently present nonlinear behavior, which means that process dynam-ics change with the operating points. These nonlinearities can challenge process control. PID controllers are the most popular controllers because they are simple and robust. However, a fixed set of PID tuning parameters is gen-erally not sufficient to optimize control of the process. Problems related to nonlinearities such as sluggish or oscilla-tory response can arise in different operating regions. Gain scheduling is a potential solution. In processes with mul-tiple control objectives, the control strategy must further evaluate loop interactions to decide on the pairing of manipulated and controlled variables that minimize the effect of such interactions and hence, optimize controller’s performance and stability. Using the CADSIM Plus™ commercial simulation software, we developed a Jacobian sim-ulation module that enables automatic bumps on the manipulated variables to calculate process gains at different operating points. These gains can be used in controller tuning. The module also enables the control system designer to evaluate loop interactions in a multivariable control system by calculating the Relative Gain Array (RGA) matrix, of which the Jacobian is an essential part.

Еlectric Drive and Control System of Flying saw of electricweld item

2015 ◽  
Vol 19 (95) ◽  
pp. 50-53
Author(s):  
Aleksej A. Kravcov ◽  
◽  
Leonid G. Limonov ◽  
Valerij V. Sinelnikov ◽  
Stanislav V. Potapov
Keyword(s):  
Control System ◽  
Drive And Control ◽  
And Control
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