Design and Performance of A 220 V 10 kVA Adaptive Low DC-Link Voltage Controlled HAPF with a Coupling Neutral Inductor Experimental System

2014 ◽  
pp. 111-144
Author(s):  
Chi-Seng Lam ◽  
Man-Chung Wong
Keyword(s):  
Experimental System ◽  
And Performance

scholarly journals AP-XPS beamline, a platform for operando science at Pohang Accelerator Laboratory

2020 ◽  
Vol 27 (2) ◽  
pp. 507-514
Author(s):  
Geonhwa Kim ◽  
Youngseok Yu ◽  
Hojoon Lim ◽  
Beomgyun Jeong ◽  
Jouhahn Lee ◽  
...  
Keyword(s):  
High Resolution ◽  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
Experimental System ◽  
Photon Flux ◽  
Acceptance Angle ◽  
X Ray ◽  
Pohang Accelerator Laboratory ◽  
And Performance ◽  
X Ray Absorption

Beamline 8A (BL 8A) is an undulator-based soft X-ray beamline at Pohang Accelerator Laboratory. This beamline is aimed at high-resolution ambient-pressure X-ray photoelectron spectroscopy (AP-XPS), soft X-ray absorption spectroscopy (soft-XAS) and scanning photoemission microscopy (SPEM) experiments. BL 8A has two branches, 8A1 SPEM and 8A2 AP-XPS, that share a plane undulator, the first mirror (M1) and the monochromator. The photon beam is switched between the two branches by changing the refocusing mirrors after the monochromator. The acceptance angle of M1 is kept glancing at 1.2°, and Pt is coated onto the mirrors to achieve high reflectance, which ensures a wide photon energy range (100–2000 eV) with high resolution at a photon flux of ∼1013 photons s−1. In this article, the main properties and performance of the beamline are reported, together with selected experiments performed on the new beamline and experimental system.

Three Cooling Seasons Monitoring of Exergetic Performance Analysis of an EAHE Assisted Solar Greenhouse Building

2012 ◽  
Vol 135 (2) ◽  
Author(s):  
Onder Ozgener ◽  
Leyla Ozgener
Keyword(s):  
Heat Exchanger ◽  
Closed Loop ◽  
System Analysis ◽  
Cooling System ◽  
Experimental System ◽  
Cooling Mode ◽  
Cooling Period ◽  
Solar Greenhouse ◽  
And Performance

The present manuscript experimentally investigated the exergetic performance (efficiency) of a closed loop earth to air heat exchanger (underground air tunnel) in the cooling mode. The experimental system was commissioned in June 2009 and experimental data collecting have been conducted since then. The data, consisting of hourly thermodynamics records a year cooling period, 2009–2011, were measured in the Solar Energy Institute of the Bornova Campus at Ege University. At the present time, the database contains more than 40,000 records of measurements. Exergetic efficiencies value of the system and system components have been analyzed. Furthermore, a long term exergetic modeling of a closed loop earth-to-air heat exchanger solar greenhouse cooling system for system analysis and performance assessment is presented. Exergetic efficiency of the system and its compenents at various reference states are also determined.

scholarly journals Study on the Structure and Performance of an Antagonistic Pneumatic Bidirectional Rotary Joint

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Hongbo Liu ◽  
Guodong Sun ◽  
Dexu Geng ◽  
Junye Li
Keyword(s):  
Rotation Angle ◽  
Experimental System ◽  
Air Pressure ◽  
Service Robots ◽  
Damping Characteristics ◽  
Gel Casting ◽  
Maximum Angle ◽  
Braking Torque ◽  
And Performance ◽  
Time Required

An antagonistic pneumatic bidirectional rotary flexible joint was developed to improve both safety and environmental adaptability of service robots and associated human interactions. The joint comprises two semicircular rotary actuators with positive and negative symmetrical distributions and a pneumatic brake. As such, it achieves forward and reverse rotations, and its damping and braking are adjustable in real time, enabling it to maintain its position. According to the force/torque balance at the free end of the rotary actuator, the rotation angle static model was established. The relationship between the actuator rotation angle, driving torque, impedance torque, and air pressure was obtained experimentally. The brake airbag was manufactured using additive manufacturing and silicone gel casting technologies. The mathematical model of the braking torque was established next, and the model was verified through experiments. Furthermore, an experimental system was constructed to carry out the air pressure-angle, air pressure-torque, and speed response experiments without the load on the joint. The results have shown that the joint can achieve any position within ± 68.5° when the driving air pressure varies from 0 to 0.30 MPa; the time required to reach the maximum angle was 0.85 s. The joint has shown good adjustable damping characteristics. Lastly, the braking torque reached 4.21 Nm at 0.32 MPa, effectively maintaining the position.

Performance Evaluation of Experimental Device for Space Robot

1994 ◽  
Vol 6 (5) ◽  
pp. 384-389
Author(s):  
Hironori A. Fujii ◽  
◽  
Kenji Uchiyama ◽  
Tsugito Maruyama ◽  
Keyword(s):  
Performance Evaluation ◽  
Dynamic Behavior ◽  
Vertical Plane ◽  
Experimental System ◽  
Space Robot ◽  
Experimental Device ◽  
Dynamic Features ◽  
And Performance ◽  
And Control ◽  
Flying Robot

An experimental system simulating the dynamic behavior of a space manipulator is illustrated in this paper. It is constructed for the purpose of technological demonstration and performance evaluation of space robot. The system consists of a model of space robot having dual manipulators, suspension system, and control system. The model is hung by wire at each joint of the manipulator to cancel the effect of the gravitational force on the ground. The value of wire tension is maintained constant to provide a ground simulation of the dynamic behavior of the manipulator in space. Accelerometers are employed to evaluate the micro-gravity condition for the present experimental device. The dynamics of the twolink manipulator with rigid link is analyzed numerically and experimentally, employing the present facility through the inspection of their dynamic features. In the present paper, the motion of the manipulator is restricted in the vertical plane as the first stage of study. The motion of a free-flying robot is also simulated in the experiment. The results of the numerical simulation and ,the experiment are presented to show the sufficient capability of the ground simulation to study dynamcal behavior of the manipulator in space.

The Complete Performance Map of Gas Wave Ejector and Analysis on the Variation Laws and Limitation of Performance

2020 ◽  
Vol 142 (2) ◽  
Author(s):  
Dapeng Hu ◽  
Yiming Zhao ◽  
Teng Wu ◽  
Zhonghui Li ◽  
Yang Yu ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Pressure Ratio ◽  
Experimental System ◽  
Driving Pressure ◽  
Factors Affecting ◽  
Application Range ◽  
Expansion Waves ◽  
Performance Map ◽  
Specific Performance ◽  
And Performance

Abstract The gas wave ejector (GWE) is an efficient gas wave equipment using pressure waves to realize energy exchange. In this paper, a theoretical analysis of the limitation of application range and the factors affecting the performance of GWE was carried out by numerical simulation. And a complete experimental system including an adjustable GWE was employed to obtain the specific performance values in various working conditions. Such theoretical analysis showed that the device became inapplicable with a relatively high driving pressure ratio, resulting from the generation of supersonic flow at the outlet end of the passages. A relatively high supercharging ratio also limited the equipment application because of the weakening of the reflected expansion waves and the enhancement of the reversed compression wave. Furthermore, the mixing, vortex, viscosity, and other flow losses could also affect the equipment performance. Then, a complete performance map indicating the specific performance values in the application range was obtained by plenty of experiments. The performance map proved that GWE had excellent efficiency and broad applicability especially as the driving pressure ratio was lower than 2.6. The results are significant for practical application and performance improvement of GWE.

scholarly journals Experimental system for studying the effect of the arrangement of nonhermetic module fillers on the outgassing flow density

2020 ◽  
Vol 2020 (4) ◽  
pp. 82-96
Author(s):  
A.M. Aksiutenko ◽  
◽  
Yu.P. Yefymov ◽  
R.A. Kantserova ◽  
M.V. Petrushenko ◽  
...  
Keyword(s):  
Experimental System ◽  
Measuring System ◽  
Flow Density ◽  
National Academy Of Sciences ◽  
Small Spacecraft ◽  
Space Agency ◽  
Frequent Use ◽  
Experiment Control ◽  
Space Projects ◽  
And Performance

In recent years, components and materials of industrial and commercial quality have been in frequent use in the assembly of small spacecraft to reduce the cost of space projects. This may affect spacecraft and onboard equipment reliability and performance quality. In particular, a high risk may arise from unpredictable performance characteristics of components and materials of this type caused by outgassing flows of unregulated density. The situation is aggravated by difficulties in numerical simulation of the complex internal geometry of actual nonhermetic small spacecraft. The most efficient way to resolve this problem is to conduct laboratory tests. This paper presents an experimental system for studying the dependence of degassing processes on the geometry of arrangement of electronics boards and various structural materials in a nonhermetic module. The theoretic basis for experiments is a differential realization of the accumulation method, which allows one to differentiate the density of degassing flows from particularly arranged specimens and elements of the module’s inner surface. To reproduce the design features of nonhermetic nano- and picosatellites, models of nonhermetic modules were refined, and a special laboratory module was made on their basis. For this purpose, a unit of synchronous module evacuation control was updated, equipment was developed for positioning plate-type fillers of nonhermetic modules, the recording of gas-dynamic parameters of a nonhermetic module’s own internal atmosphere was provided, and an automated experiment control system was prepared. The laboratory module was integrated into the automated measuring system of the VAU-2M vacuum aerodynamic installation of the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine. The experimental system developed was tested to show a satisfactory operability of both its components and the system as a whole. The system developed allows one to study outgassing from the surface of various components and materials, to measure the density of outgassing flows for various equipment arrangements, and to study the dynamics of outflow of the products of the own internal atmosphere through calibrated orifices, which simulate the outflow of the own internal atmosphere of a nonhermetic module through its unregulated clearances.

Friction and the Inverted Pendulum Stabilization Problem

2008 ◽  
Vol 130 (5) ◽  
Author(s):  
Sue Ann Campbell ◽  
Stephanie Crawford ◽  
Kirsten Morris
Keyword(s):  
Small Amplitude ◽  
Viscous Friction ◽  
Experimental System ◽  
Linear Quadratic Regulator ◽  
Poor Performance ◽  
Friction Model ◽  
Linear Quadratic ◽  
Stick Slip ◽  
And Performance ◽  
Friction Parameters

We consider an experimental system consisting of a pendulum, which is free to rotate 360deg, attached to a cart. The cart can move in one dimension. We study the effect of friction on the design and performance of a feedback controller, a linear quadratic regulator, that aims to stabilize the pendulum in the upright position. We show that a controller designed using a simple viscous friction model has poor performance—small amplitude oscillations occur when the controller is implemented. We consider various models for stick slip friction between the cart and the track and measure the friction parameters experimentally. We give strong evidence that stick slip friction is the source of the small amplitude oscillations. A controller designed using a stick slip friction model stabilizes the system, and the small amplitude oscillations are eliminated.

Nonlinear semi-active adaptive vibration control of a half vehicle model under unmeasured road input

2019 ◽  
Vol 25 (18) ◽  
pp. 2453-2472 ◽  
Author(s):  
Mahmut Paksoy ◽  
Muzaffer Metin
Keyword(s):  
Adaptive Control ◽  
Control Method ◽  
Experimental System ◽  
Vehicle Model ◽  
Nonlinear Adaptive Control ◽  
The Road ◽  
Frequency Domains ◽  
And Performance ◽  
Set Up ◽  
Magneto Rheological

This study examined automobile vibrations by using a half vehicle model, and its vertical and angular vibrations were suppressed by means of the nonlinear adaptive control of a magneto-rheological damper. The control method was designed in such a way that it did not need to measure the road input to suppress the vibrations by the use of adaptive road observers. Therefore, disadvantages such as measurement difficulty and cost were also eliminated. Instead of completely experimental test rigs, the hardware-in-the-loop simulation which is a hybrid method was preferred due to it being easier to set up, cheaper, and also it had a close response to the full experimental system. The experimental responses obtained by the proposed adaptive control method with adaptive road observers and the nonlinear adaptive control method in which the road disturbances were measured were compared in the time and frequency domains. Finally, the effectiveness of the proposed method was shown using some figures, root mean square values, and performance indices.

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