Detection and Suppression System Design

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.

Download Full-text

Direct Disturbance Suppression System Design for High Precision Fabrication Tables

Transactions of the Korean Society of Mechanical Engineers A ◽

10.3795/ksme-a.2020.44.11.843 ◽

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

Download Full-text

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

Sensors ◽

10.3390/s21196414 ◽

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).

Download Full-text