The effect of rotation speed on the power consumption and cutting accuracy of guided circular saw: Experimental measurement and analysis of saw critical and flutter speeds

2018 ◽  
Vol 15 (3) ◽  
pp. 140-146 ◽  
Author(s):  
Vahid Nasir ◽  
Ahmad Mohammadpanah ◽  
Julie Cool
Keyword(s):  
Power Consumption ◽  
Experimental Measurement ◽  
Rotation Speed ◽  
Circular Saw ◽  
Measurement And Analysis

scholarly journals Operational Improvement of Main Pumps for Energy-Saving in Wastewater Treatment Plants

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2438 ◽  
Author(s):  
Hiroyuki Kato ◽  
Hiroyuki Fujimoto ◽  
Kenichi Yamashina
Keyword(s):  
Wastewater Treatment ◽  
Power Consumption ◽  
Energy Saving ◽  
Energy Savings ◽  
Rotation Speed ◽  
Wastewater Treatment Plants ◽  
Speed Control ◽  
Operational Improvement ◽  
Energy Independence ◽  
Save Energy

Efforts towards energy independence in wastewater treatment plants (WWTPs) constitute important policy in Japan. Energy-saving strategies consist of operational improvements and the installation of energy-saving devices. The energy consumed by the main pumps is equal to approximately 14% of the energy consumed by WWTPs in average in Japan. The main pumps, which are simple machines, do not have the innovative, energy-saving devices associated with other equipment used in WWTPs; therefore, realizing energy savings through operational improvement is extremely important. In recent years, variable frequency drives (VFDs) have increasingly been used to control the rotation speed of main pumps in order to save energy. However, there are many cases where power consumption increases due to the excessive rotation speed control ignoring pump characteristics. In this study, improvement of the operating method based on the power consumption analysis is examined for A WWTP. Differences in characteristics between water pumps and wastewater pumps are discussed, and simulation results without rotational speed control show a reduction in power consumption of 10%. Daily operational report data of the WWTP are used for the power consumption analysis, and additional data acquisition is not necessary. Thus, the power consumption analysis method used in this study can be easily applied to other WWTPs.

UWB propagation channel experimental measurement and analysis

2009 ◽  
Author(s):  
Yujie Zeng ◽  
Behshad Memari ◽  
Melanie Biggs ◽  
Clive Harding ◽  
Bahram Honary
Keyword(s):  
Experimental Measurement ◽  
Propagation Channel ◽  
Measurement And Analysis

Whistling Instability in Idling Circular Saws

1980 ◽  
Vol 102 (2) ◽  
pp. 114-122 ◽  
Author(s):  
C. D. Mote ◽  
M. C. Leu
Keyword(s):  
Resonant Frequency ◽  
Rotation Speed ◽  
Noise Source ◽  
Source Model ◽  
Transverse Instability ◽  
Circular Saw ◽  
Tooth Number ◽  
Intense Noise ◽  
Circular Saws ◽  
Wake Oscillation

Whistling is a self-excited transverse instability that produces intense noise at a resonant frequency of a circular saw. Experiments were undertaken to examine the noise source dependence upon tooth shape, tooth number, rotation speed and the surrounding air pressure. The source model supported by the data is a self excited fluid-structure instability possibly with a wake oscillation sustained or enhanced by the blade motion.

Experimental Measurement and Analysis of Pulse Transmission Source of GPR

2012 ◽  
Vol 503-504 ◽  
pp. 1365-1368
Author(s):  
Hui Xu ◽  
Guo Rui Wu
Keyword(s):  
Experimental Measurement ◽  
Pulse Width ◽  
Duty Ratio ◽  
Trigger Pulse ◽  
Actual Measurement ◽  
The Core ◽  
Pulse Transmission ◽  
Shallow Soil ◽  
Measurement And Analysis ◽  
Rf Transistor

According to the transmission pulse requirements of the impulse-GPR which probes the objectives of shallow soil, a transmission circuit is designed and made. On the basis of the transistor avalanche theory, avalanche transistor and RF transistor are used to generate the impulse-GPR transmission pulse as the core transistors. Trigger pulse is the square wave which is produced by FPGA as the trigger of whole system, its duty ratio under 10% and its frequency from 50 kHz to 500 kHz. As the results of simulation and actual measurement shown, single transistor avalanche circuit and four transistors cascade avalanche circuit can produce a narrow pulse with its pulse width from 1.337ns to 42.91ns. The results meet the transmission pulse requirements of impulse-GPR which probes the objectives of shallow soil.

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