TECHNOLOGY & PATENTS:
Vibration Control by Confinement (VCC)
Energy Flow Control (EFC)
USA and International Patents
- 14 years of government and commercial projects
- 13 U.S. and international patents
- Expertise in noise/vibration/acoustics/shock analysis and control
- Capabilities in modeling simulation and analysis
- Capabilities in testing and evaluation
- Capabilites in field data collection and analysis
- Ability to secure government funds for R&D projects ($2.5 billion funding pool)
- Ability to secure sole source phase 3 awards
Publications
Abstract
Title: Design and Implementation of the Noise and Vibration Reduction Solutions in the MINNTAC Facilities - Part I
Author: Daryoush Allaei (QRDC, Inc.), David Tarnowski (QRDC, Inc.), Joe Scipioni (MINNTAC), Rob Tomassoni (MINNTAC), and Laurie Potter (MINNTAC)
Acknowledgment: US Steel-MINNTAC funded this project. The MINNTAC personnel were very helpful and accommodating throughout the course of this work. Their continuous assistance, promptly providing information, answering questions, and offering excellent suggestions were very helpful in successfully conducting this project.
The presence of high levels of noise and vibrations may not only affect the health of maintenance and operating crews, but may also influence the performance of the machinery and production of a plant. One of the most effective methods to address noise and vibration issues is to identify the sources of energy and the energy flow paths. Based on the identified energy paths, a cost effective and efficient solution may be recommended. This approach was implemented in a pilot site at US Steel, MINNTAC division in Minnesota and a practical four-stage solution was executed. This paper is focused on the findings related to the first part of the four-stage solution, namely the removal of excess structural couplings in screen areas, vibration measurements, and levels of improvements.
The vibration and noise data were measured before and after the structural couplings were modified or removed. Vibration measurements were partitioned into three stages: (1) overall vibration levels at 56 points across the deck, (2) operating mode shapes (OMS) of the floor, and (3) modal characteristics of the floor. The overall acceleration levels were measured at three points across each screen. The variation in the measured acceleration levels across the floor was observed to be about 0.06G (i.e., 67% of peak). The overall mean acceleration level was reduced by about 36% while the overall peak acceleration was reduced by about 24%.
Based on the analysis of the collected baseline noise and vibration measurements, it was found that the overall vibration levels were significantly reduced due to modification and/or removal of unnecessary structural couplings. No significant change was observed in the overall noise level.
Abstract
Title: Design and Implementation of the Noise and Vibration Reduction Solutions in the MINNTAC Facilities - Part I
Author: Daryoush Allaei (QRDC, Inc.), David Tarnowski (QRDC, Inc.), Joe Scipioni (MINNTAC), Rob Tomassoni (MINNTAC), and Laurie Potter (MINNTAC)
Acknowledgment: US Steel-MINNTAC funded this project. The MINNTAC personnel were very helpful and accommodating throughout the course of this work. Their continuous assistance, promptly providing information, answering questions, and offering excellent suggestions were very helpful in successfully conducting this project.
The presence of high levels of noise and vibrations may not only affect the health of maintenance and operating crews, but may also influence the performance of the machinery and production of a plant. One of the most effective methods to address noise and vibration issues is to identify the sources of energy and the energy flow paths. Based on the identified energy paths, a cost effective and efficient solution may be recommended. This approach was implemented in a pilot site at US Steel, MINNTAC division in Minnesota and a practical four-stage solution was executed. This paper is focused on the findings related to the first part of the four-stage solution, namely the removal of excess structural couplings in screen areas, vibration measurements, and levels of improvements.
The vibration and noise data were measured before and after the structural couplings were modified or removed. Vibration measurements were partitioned into three stages: (1) overall vibration levels at 56 points across the deck, (2) operating mode shapes (OMS) of the floor, and (3) modal characteristics of the floor. The overall acceleration levels were measured at three points across each screen. The variation in the measured acceleration levels across the floor was observed to be about 0.06G (i.e., 67% of peak). The overall mean acceleration level was reduced by about 36% while the overall peak acceleration was reduced by about 24%.
Based on the analysis of the collected baseline noise and vibration measurements, it was found that the overall vibration levels were significantly reduced due to modification and/or removal of unnecessary structural couplings. No significant change was observed in the overall noise level.
125 Columbia Court, Suite 6, Chaska, MN 55318
phone 952.556.5205 | fax 952.556.5206
email arash@qrdc.com
phone 952.556.5205 | fax 952.556.5206
email arash@qrdc.com