Digital Filter Algorithm Based on Whistle Sound Suppression System Design

2012 ◽  
Author(s):  
Lei Liu ◽  
Honggang Li ◽  
Xiaochen Hu
Keyword(s):  
System Design ◽  
Digital Filter ◽  
Suppression System ◽  
Sound Suppression

Multirate flutter suppression system design for a model wing

1994 ◽  
Vol 17 (6) ◽  
pp. 1267-1274 ◽  
Author(s):  
Gregory S. Mason ◽  
Martin C. Berg
Keyword(s):  
System Design ◽  
Flutter Suppression ◽  
Suppression System

Characterization of porous material and a sound suppression system using a shock tube

2016 ◽  
Vol 139 (4) ◽  
pp. 2031-2031
Author(s):  
Erica K. Good ◽  
Robert Taylor ◽  
James Luskin ◽  
Zachary Conaway
Keyword(s):  
Porous Material ◽  
Shock Tube ◽  
Suppression System ◽  
Sound Suppression

NFPA Marine Fire Protection Codes and Standards: An Overview

2013 ◽  
Author(s):  
Guy R. Colonna
Keyword(s):  
System Design ◽  
Fire Protection ◽  
Safety Management ◽  
New Technology ◽  
National Fire Protection Association ◽  
Confined Space ◽  
Maritime Industry ◽  
Maintenance And Repair ◽  
Safety Standards ◽  
Suppression System

The National Fire Protection Association (NFPA) develops consensus codes and standards for fire and life safety for a wide array of occupancies, including the maritime industry. With documents originating in the early 1920’s, NFPA maritime safety standards reflect current practices in vessel design and operations, new hazards, and new technology. These documents include safe practices associated with confined space entry and hot work operations during construction, maintenance, and repair; shipyard fire protection safety management; and suppression system design, installation, and testing/maintenance. This presentation highlights those consensus standards contributing to safety management within the maritime industry. Paper published with permission.

Direct Disturbance Suppression System Design for High Precision Fabrication Tables

2020 ◽  
Vol 44 (11) ◽  
pp. 843-853
Author(s):  
Hyoung Jin Kim ◽  
Dong Hun Lee ◽  
Hwan Cheol Park ◽  
Young Bok Kim
Keyword(s):  
System Design ◽  
High Precision ◽  
Disturbance Suppression ◽  
Suppression System

scholarly journals A Novel Transfer Function Based Ring-Down Suppression System for PMUTs

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6414
Author(s):  
Zhipeng Wu ◽  
Wenjuan Liu ◽  
Zhihao Tong ◽  
Songsong Zhang ◽  
Yuandong Gu ◽  
...  
Keyword(s):  
Transfer Function ◽  
System Design ◽  
Integrated Circuit ◽  
Ultrasonic Transducers ◽  
Design Guideline ◽  
Blind Area ◽  
Application Specific Integrated Circuit ◽  
First Time ◽  
Application Specific ◽  
Suppression System

In this paper, a novel ring-down suppression system based on transfer function is proposed for the first time to suppress the ring-down time and decrease the blind area of PMUTs (Piezoelectric Micromachined Ultrasonic Transducers). This suppression system includes a transfer function and a simple P (proportion) controller, which can reduce the ring-down time without degrading any performances of PMUTs. The transfer function serves as a virtual PMUT device, feeding its output into the P controller; then, the P controller generates a suppression signal to the actual PMUT device. The ring-down time of a 115-kHz PMUT array is demonstrated to be reduced by up to 93% through the suppression system. In addition, the P controller has been experimentally optimized, reducing the blind area of the PMUT array by about 40%. Moreover, a low ring-down PMUTs system design guideline is established, which is practical and straightforward for industrial scenarios. Finally, the system can be easily integrated into ASIC (Application Specific Integrated Circuit).

Group Delay in Digital Filter Induced Instability of a Two-Dimensional Airfoil Active Flutter Suppression System

2012 ◽  
Vol 226-228 ◽  
pp. 64-69
Author(s):  
Ming Li Yu
Keyword(s):  
Wind Tunnel ◽  
Digital Filter ◽  
Group Delay ◽  
Numerical Study ◽  
Wind Tunnel Test ◽  
Control Surface ◽  
Two Dimensional ◽  
Flutter Suppression ◽  
Active Flutter Suppression ◽  
Suppression System

The presented paper deals with the group delay in the digital filter induced instability of a two dimensional airfoil section active flutter suppression system. Firstly, the aeroelastic model of the airfoil with an ultrasonic motor actuated control surface is set up; secondly, both H∞and μ robust controllers are designed; and then, the group delay induced instability in wind tunnel test is presented; finally, through a combined theoretical and numerical study, the test phenomenon is well explained. Wind tunnel experiments and numerical simulations demonstrate that long enough group delay in digital filter can induce instability of flutter control system, the flutter under control will decrease first, and then become another flutter of lower frequency and moderated amplitude, and μ controller works better than H∞controller on the same condition.

scholarly journals Analog Versus Digital Design: When and Where to Make the Cut

2002 ◽  
Vol 1 (1) ◽  
pp. 69-80
Author(s):  
Nag Sayandeep
Keyword(s):  
System Design ◽  
Digital Filter ◽  
Temperature Sensing ◽  
Digital Design ◽  
Analog Signal ◽  
Signal Conditioning ◽  
Mathematical Algorithms ◽  
The Right ◽  
And Control ◽  
Analog Domain

System designers are frequently asked to create circuits that measure and control the analog world. One of the the challenges in these types of designs is to know when to convert the signal signal from the analog domain to the digital domain. In the analog domain, signal conditioning techniques such as gain, offset, and filtering are used to quickly modify the incoming signal. Alternatively, mathematical algorithms are used in the digital domain to implement similar functions. Every system design is unique and requires custom solutions for each case, but there are some general guidelines that can help the designer make the right decisions concerning where to draw the line. Two circuit scenarios will be discussed in this paper. With each of the two systems, the question of when and where to use analog signal conditioning strategies as opposed to digital techniques will be answered. The first scenario that will be used in this discussion is a simple RTD(Resistance Temperature Detectors) temperature sensing circuit. With this system, digital versus analog calibration, gain and offset techniques will be under evaluation.Filtering techniques is the second scenario that will be evaluated. Discussions will show that all circuit designs require a degree of analog filtering whether or not the input analog signal is DC or AC. From this premise, the advantages of analog versus digital filter designs will be investigated.

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