scholarly journals Design and study of new riser dynamic load compensation device test system

2021 ◽  
Vol 2029 (1) ◽  
pp. 012084
Author(s):  
Zhikun Wang ◽  
Yanting Zhang ◽  
Ruifeng Wang ◽  
Lumeng Huang
Keyword(s):  
Dynamic Load ◽  
Test System ◽  
Load Compensation ◽  
Compensation Device ◽  
Device Test

Pore Pressure Build-up of Silt Soft Clay under Dynamic Loading at Zhoushan Islands

2012 ◽  
Vol 594-597 ◽  
pp. 460-464
Author(s):  
Qian Shi ◽  
Kui Zhou ◽  
Qiang Li
Keyword(s):  
Pore Pressure ◽  
Dynamic Loading ◽  
Dynamic Load ◽  
Soft Clay ◽  
Test System ◽  
Dynamic Responses ◽  
Minor Effect ◽  
Consolidation Pressure ◽  
Anisotropic Consolidation ◽  
Pore Pressure Build Up

The mechanism of dynamic tri-axial test is introduced in this paper and the dynamic responses of silt soft clay at Zhoushan are studied using a dynamic tri-axial test system. The laws of pore pressure build-up of the silt clay are obtained which are affected by the consolidation pressure and dynamic load. The greater the consolidation pressure and the dynamic loading is, the more the build-up of pore pressure is. However, the dynamic load has minor effect on pore pressure build-up under the anisotropic consolidation.

LCL Filter with Active Damping using PI and SSI Regulators in Synchronous Rotating Reference Frame Current Controller for DSTATCOM

2013 ◽  
Vol 14 (4) ◽  
pp. 309-326
Author(s):  
Nagesh Geddada ◽  
Mahesh Kumar Mishra
Keyword(s):  
Steady State ◽  
Dynamic Load ◽  
Distribution System ◽  
Voltage Drop ◽  
Active Damping ◽  
Voltage Source ◽  
Lcl Filter ◽  
Load Compensation ◽  
Current Controller ◽  
Load Conditions

Abstract This article proposes a distribution static compensator (DSTATCOM) with interface LCL (inductor-capacitor-inductor) filter for load compensation in three-phase four-wire distribution system. DSTATCOM, consisting of voltage source inverter (VSI), is connected in parallel to the load and injects currents corresponding to load reactive, harmonic powers. But this injected current consists of unnecessary high-frequency switching ripple generated by VSI. This LCL filter has superior switching ripple attenuation capability compared to L filter. Moreover, this can be achieved with small value of overall LCL filter inductance than L filter. Thus providing high slew rate for output current to track the desired reference current closely, reducing voltage drop across it, as well as cost and size of filter. However, one major concern with LCL filter is its resonating frequency (determined from its L, C, L values), which can create high-resonance oscillating currents and results in improper load compensation. Therefore, in this study, proper design of LCL filter with high switching ripple attenuation and a current controller with proportional integral (PI) plus harmonic compensation (HC) regulators along with active damping feature of LCL filter in synchronous rotating reference (dq0) frame are presented. HC regulator minimizes the steady-state error in the non-sinusoidal filter currents (fundamental and harmonic) which are tracked by the VSI. Active damping feature (obtained by capacitor current feedback control of LCL filter) is used to overcome resonance oscillations and provides proper control, operation of DSTATCOM under steady-state and dynamic load conditions. Stability studies for designed LCL filter and current controller using Bode and root locus plots are also performed and presented. Extensive simulation study, to understand the compensation performance of LCL filter DSTATCOM with two types of current controllers (PI and PI plus HC) under steady-state and dynamic load conditions, is carried out in PSCAD simulator and the corresponding results along with THDs of various parameters are presented.

Study on Microstructure Changes of Soft Clay in the Peal River Delt under Dynamic Load

2014 ◽  
Vol 894 ◽  
pp. 238-244
Author(s):  
Shi Hua Liang ◽  
Lang Zhang ◽  
Yong Jian Liu ◽  
Na Fu
Keyword(s):  
Dynamic Load ◽  
Soft Soil ◽  
Soft Clay ◽  
Microscopic Theory ◽  
Average Diameter ◽  
Test System ◽  
True Triaxial Test ◽  
True Triaxial ◽  
Shape Coefficient ◽  
Microstructure Parameters

The characteristics and distribution of pores in soil are the key factors in the determination of the physical and mechanical characteristics of soft soil. Using static-dynamic true triaxial test system of modified SPAX-2000 and scanning electron microscope (SEM), the microstructure images of soft clay in the Peal River Delt are studied. By analyzing these microstructure images, eight microstructure parameters including number of pore, total area, classification of area, total perimeter, average diameter, roundness, shape coefficient and anisotropy have been obtained. The changes of microstructure parameters are analyzed ,before and after applying dynamic load . The results show that the change of microstructure parameters has certain rules. This study is help to provide microscopic theory basis for static-dynamic drainage consolidation method to treatment soft ground engineering design.

Medical Device Interoperability A Standards-Based Testing Approach

2011 ◽  
Vol 45 (3) ◽  
pp. 249-255
Author(s):  
John J. Garguilo ◽  
Sandra Martinez ◽  
Maria Cherkaoui
Keyword(s):  
Information System ◽  
Medical Device ◽  
Information Exchange ◽  
Data Exchange ◽  
Infusion Pump ◽  
Test System ◽  
Healthcare Information ◽  
System Validation ◽  
Healthcare Information System ◽  
Device Test

Abstract We present a black-box messaging test approach employed to achieve a level of rigor which improves—if not assures, given no optionality—correct data exchange. In particular, we verify that physiological information derived and communicated via messaging from a source medical device (e.g., an infusion pump) or healthcare information system, to another medical device (e.g., a patient monitor) or healthcare information system, which consumes or makes use of the data, is syntactically and semantically correct. In other words, the structure of information exchanged within the healthcare system is compliant to a defined specification(s) and the information meaning conveyed and interpreted by the consumer is exactly the same and as intended by the source. Our approach for developing a test system to validate messages is based on constraining identified and recognized specifications. The test system validation performed uses codified assertions derived from the specifications and constraints placed upon those specifications. To first show conformance—which subsequently enables interoperability—these assertions, which are atomic requirements traceable by clause to the base specifications, are employed by our medical device test tools to rigorously enforce standards to facilitate safe and effective plug-and-play information exchange.

Characterization and testing of the Caltrans Seismic Response Modification Device Test System

2001 ◽  
Vol 359 (1786) ◽  
pp. 1829-1850 ◽  
Author(s):  
Jean Spangler Shortreed ◽  
Frieder Seible ◽  
Andre Filiatrault ◽  
Gianmario Benzoni
Keyword(s):  
Seismic Response ◽  
Test System ◽  
Device Test

scholarly journals Development of an SDBC-MMCC-Based DSTATCOM for Real-Time Single-Phase Load Compensation in Three-Phase Power Distribution Systems

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4705 ◽  
Author(s):  
Wei-Neng Chang ◽  
Ching-Huan Liao
Keyword(s):  
Electric Power ◽  
Power Distribution ◽  
Distribution Systems ◽  
Single Phase ◽  
Test System ◽  
Power Distribution Systems ◽  
Static Synchronous Compensator ◽  
Load Compensation ◽  
Electric Power Distribution ◽  
Three Phase

This paper proposes a newly developed single-delta bridge-cell, modular multilevel cascade converter (SDBC-MMCC)-based distribution-level static synchronous compensator (DSTATCOM) for single-phase load compensation in three-phase, three-wire electric power distribution systems. Each main circuit arm of the DSTATCOM uses a modular multilevel cascade converter based on full-H-bridge (FHB) cells. The three main DSTATCOM arms are delta-connected to allow phase-independent operations for phase balancing and unity power factor correction of the single-phase load in three-phase, three-wire electric power distribution systems. By using the symmetrical components method, a feedforward compensation algorithm was employed for the DSTATCOM. A simulation of the DSTATCOM was performed for functioning verification. Finally, a hardware test system was built by using a multi-DSP-based control system. The test results verified the effectiveness of the proposed SDBC-MMCC-based DSTATCOM in single-phase load compensation.

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