Optimum Operating Parameters and Blade Setting of a High-Speed Propeller

2021 ◽  
pp. 1-18
Author(s):  
Tayeb Boulkeraa ◽  
Adel Ghenaiet ◽  
Ernesto Benini
Keyword(s):  
High Speed ◽  
Optimum Operating ◽  
Operating Parameters

scholarly journals Development of a Compact,  Configurable, Real-Time Range  Imaging System

2021 ◽  
Author(s):  
◽  
Adrian Peter Paul Jongenelen
Keyword(s):  
High Speed ◽  
Imaging System ◽  
Modulation Frequency ◽  
Image Sensor ◽  
Measurement Precision ◽  
Operating Parameters ◽  
Range Imaging ◽  
Field Range ◽  
Full Field ◽  
Precision And Accuracy

<p>This thesis documents the development of a time-of-flight (ToF) camera suitable for autonomous mobile robotics applications. By measuring the round trip time of emitted light to and from objects in the scene, the system is capable of simultaneous full-field range imaging. This is achieved by projecting amplitude modulated continuous wave (AMCW) light onto the scene, and recording the reflection using an image sensor array with a high-speed shutter amplitude modulated at the same frequency (of the order of tens of MHz). The effect is to encode the phase delay of the reflected light as a change in pixel intensity, which is then interpreted as distance. A full field range imaging system has been constructed based on the PMD Technologies PMD19k image sensor, where the high-speed shuttering mechanism is builtin to the integrated circuit. This produces a system that is considerably more compact and power efficient than previous iterations that employed an image intensifier to provide sensor modulation. The new system has comparable performance to commercially available systems in terms of distance measurement precision and accuracy, but is much more flexible with regards to its operating parameters. All of the operating parameters, including the image integration time, sensor modulation phase offset and modulation frequency can be changed in realtime either manually or automatically through software. This highly configurable system serves as an excellent platform for research into novel range imaging techniques. One promising technique is the utilisation of measurements using multiple modulation frequencies in order to maximise precision over an extended operating range. Each measurement gives an independent estimate of the distance with limited range depending on the modulation frequency. These are combined to give a measurement with extended maximum range using a novel algorithm based on the New Chinese Remainder Theorem. A theoretical model for the measurement precision and accuracy of the new algorithm is presented and verified with experimental results. All distance image processing is performed on a per-pixel basis in real-time using a Field Programmable Gate Array (FPGA). An efficient hardware implementation of the phase determination algorithm for calculating distance is investigated. The limiting resource for such an implementation is random access memory (RAM), and a detailed analysis of the trade-off between this resource and measurement precision is also presented.</p>

The treatment of zinc-cyanide electroplating rinse water using an electrocoagulation process

2013 ◽  
Vol 68 (10) ◽  
pp. 2220-2227 ◽  
Author(s):  
Elif Senturk
Keyword(s):  
Electrode Material ◽  
Operating Time ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Operating Parameters ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Removal Efficiencies ◽  
Rinse Water ◽  
Electrode Connection

This paper investigates the treatment of zinc-cyanide electroplating rinse water using an electrocoagulation process (ECP). The effects of operating parameters such as electrode material, current density (2.5–40 A/m2), operating time (0–60 min), initial pH (5–12) and electrode connection mode (monopolar parallel (MP-P), monopolar series and bipolar series) on the ECP were evaluated to find the optimum operating conditions. At 20 A/m2, 60 min, the highest removal efficiencies were obtained with 85 and 99% for Fe and 64 and 33% for Al electrodes, for cyanide and zinc, respectively. The optimum operating conditions were found to be 30 A/m2 and 40 min, for the Fe electrode at the original pH (9.5) of the rinse water. Considering efficiency and economy, the MP-P connection mode was determined as the optimum connection mode.

A Forced Response Analysis and Application of Impact Dampers to Rotordynamic Vibration Suppression in a Cryogenic Environment

1993 ◽  
Author(s):  
J. J. Moore ◽  
A. Palazzolo ◽  
R. Gadangi ◽  
T. A. Nale ◽  
S. A. Klusman ◽  
...  
Keyword(s):  
High Speed ◽  
Vibration Suppression ◽  
Forced Response ◽  
Optimum Operating ◽  
Response Analysis ◽  
Amplitude Dependence ◽  
Test Rig ◽  
Equivalent Viscous Damping ◽  
Impact Damper ◽  
The Impact

Abstract A high speed damper test rig has been assembled at Texas A&M University to develop rotordynamic dampers for rocket engine turbopumps that operate at cryogenic temperatures, such as those used in the Space Shuttle Main Engines (SSMEs). Damping is difficult to obtain in this class of turbomachinery due to the low temperature and viscosity of the operating fluid. An impact damper has been designed and tested as a means to obtain effective damping in a rotorbearing system. The performance and behavior of the impact damper is verified experimentally in a cryogenic test rig at Texas A&M. Analytical investigations indicate a strong amplitude dependence on the performance of the impact damper. An optimum operating amplitude exists and is determined both analytically and experimentally. In addition, the damper performance is characterized by an equivalent viscous damping coefficient. The test results prove the impact damper to be a viable means to suppress vibration in a cryogenic rotorbearing system.

Optimization of an Organic Rankine Cycle-Based Waste Heat Recovery System Using a Novel Target-Temperature-Line Approach

2021 ◽  
Vol 143 (9) ◽  
Author(s):  
Md. Zahurul Haq
Keyword(s):  
Heat Exchange ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Optimum Operating ◽  
Working Fluid ◽  
Operating Parameters ◽  
Target Temperature

Abstract Organic Rankine cycle (ORC)-based waste heat recovery (WHR) systems are simple, flexible, economical, and environment-friendly. Many working fluids and cycle configurations are available for WHR systems, and the diversity of working fluid properties complicates the synergistic integration of the efficient heat exchange in the evaporator and net output work. Unique guidelines to select a proper working fluid, cycle configuration and optimum operating parameters are not readily available. In the present study, a simple target-temperature-line approach is introduced to get the optimum operating parameters for the subcritical ORC system. The target-line is the locus of temperatures satisfying the pinch-point temperature difference along the length of the heat exchanger. Employing the approach, study is carried out with 38 pre-selected working fluids to get the optimum operating parameters and suitable fluid for heat source temperatures ranging from 100 °C to 300 °C. Results obtained are analyzed to get cross-correlations between key operating and performance parameters using a heat-map diagram. At the optimum condition, optimal working fluid’s critical temperature and pressure, evaporator saturation temperature, effectivenesses of the heat exchange in the evaporator, cycle, and overall WHR system exhibit strong linear correlations with the heat source temperature.

scholarly journals Optimum operating parameters of CO2 sorption in turbulent fluidized bed regime using potassium carbonate supported on gamma alumina solid sorbent

RSC Advances ◽  
2018 ◽  
Vol 8 (69) ◽  
pp. 39678-39690 ◽  
Author(s):  
Sutthichai Boonprasop ◽  
Sasinan Sangteerasintop ◽  
Benjapon Chalermsinsuwan ◽  
Pornpote Piumsomboon
Keyword(s):  
Fluidized Bed ◽  
Potassium Carbonate ◽  
Optimum Operating ◽  
Operating Parameters ◽  
Gamma Alumina ◽  
Solid Sorbent ◽  
Co2 Sorption ◽  
Turbulent Fluidized Bed

The promising solid sorbent, potassium carbonate (K2CO3) supported on gamma alumina (γ-Al2O3) prepared through impregnation was inserted into the sorption turbulent riser to determine the optimum operating parameters.

Mechanics of High Speed Texturing

1988 ◽  
Vol 58 (11) ◽  
pp. 653-662 ◽  
Author(s):  
Tae Jin Kang ◽  
Wei Li ◽  
Aly El-Shiekh
Keyword(s):  
High Speed ◽  
Applied Pressure ◽  
Operating Parameters ◽  
Linear Speed

The mechanics of ring twisting are analyzed, and the effects of machine operating parameters such as the R/Y ratio (the ratio of the linear speed of ring to the speed of the yarn path), the ring crossing angle, and the externally applied pressure are discussed. The advantages of the ring twister are compared with the stacked disc spindle and the belt twister. The restraints in designing the ring aggregate are discussed in terms of the differential relative torsional slippage.

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