Kam NgKam Acoustics Consulting LLC
Independent consultant in acoustics and noise control engineering
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Citations since 2017
8 Research Items
Dr. Kam Ng has worked in various capacities in the field of acoustics and noise control for the Navy and private sectors for over 40 years. Specifically, he has worked with aircraft engine noise, valve noise, submarine launcher noise, undersea weapons, active control of noise and vibration. He was the former Deputy Director of Research at the Office of Naval Research (ONR) overseeing $900M basic research portfolio with a wide spectrum of science and technology activities.
March 2021 - present
Kam Acoustics Consulting LLC
- Provide consultation in acoustics, noise control engineering, and science & technology business development/management. Specific projects are: OSHA noise requirement, machinery noise assessment and abatement, quiet products/devices development, business development in acoustics and noise control engineering.
July 2018 - February 2021
August 2016 - July 2018
Kam Ng Consulting LLC
- Provided consultation services in acoustics and noise control engineering, and business management.
This paper provides an overview of current research efforts in integrated diagnostics and prognostics of rotating machinery. Specifically, the following topics are discussed: sensing techniques and sensors; signal detection, identification and extraction; classification of faults; predictive failure models; data/model fusion; information management...
Typescript. Binder's title: Wall pressure and response excited by jets. Thesis (Ph. D.)--University of Rhode Island, 1988. Includes bibliographical references (leaves 93-105).
In this review paper, the acoustic aspects of control valves are discussed. Specifically, valve noise generation mechanisms, noise measurement, prediction and reduction techniques will be presented. This paper starts with government noise regulations and requirements, and acoustic terminology, then followed by valve noise generation mechanisms, noi...
In this memoir, Kam Ng shares his journey from childhood to a successful CEO by virtue of tireless and endless learning. He recounts his early years suffering from stuttering and regaining his confidence to overcome the difficulty. Through his hard work and self-determination, he finished his undergraduate and graduate degrees in engineering as wel...
This travel log covers the trip for Japan, Hong Kong and Macau in 2019. The best, the most interesting , and the most memorable moments of the trip, as well as disappointments are highlighted.
In the summer of 2022, my wife, Shirley, and I took our first ever road trip to the Midwest, Route 66 and musical venues in Tennessee. We drove 5050 miles, stopped over at 10 sightseeing attractions, covered 13 States in 17 days and three time zones. The 13 States were: West Virginia, Kentucky, Illinois, Missouri, Kansas, Iowa, South Dakota, Wyomin...
In this memoir, Kam Ng shares his early childhood experience in Hong Kong from 1951 to 1966. Kam recounts his early years living in Shau Kei Wan and Chai Wan. He describes the neighborhood, living conditions, school, after-school activities, street food, and special events during those years.
In this memoir, Kam Ng shares his experience in college level teaching. Kam recounts his years in part-time teaching at the community college and graduate level teaching at the private university. He spent two years teaching full-time for a for-profit university. He described the unique challenges and issues in a fast-paced career college. Kam is a...
In this memoir, Kam Ng shares his experience in the development of STEM (science, technology, engineering, and mathematics), and STEAM (STEM with the inclusion of arts) initiatives. STEM education prepares young people for the future, and it is the dynamic engine for economic growth. The impacts of STEM education are depending on early STEM educati...
In this memoir, Kam Ng shares his journey from childhood to a successful CEO by virtue of tireless and endless learning. Kam recounts his early years suffering from stuttering and regaining his confidence to overcome the difficulty. Through his hard work and self-determination, he finished his undergraduate and graduate degrees in engineering as we...
The acronym " STEM " is probably something you have heard repeatedly over the past 10 years, and with the continual growth of advanced technologies, it is likely that you will hear the term more. STEM stands for Science, Technology, Engineering and Mathematics, and the term is becoming a household word. So what exactly does STEM mean, and how does...
This paper provides an overview of the Undersea Weapon Design and Optimization (UWDO) program sponsored by the United States Navy's Office of Naval Research (ONR). Progress, status, and future research directions of the UWDO program are presented. The objective of the UWDO program is to develop computational tools and simulation-based methodology t...
Active noise control (ANC) technique was demonstrated to reduce fluidborne noise in a submerged pipe. Specifically, the technique was applied to the flow-induced noise caused by a confined jet under both steady-state and transient conditions. A hybrid controller, which combined both feedforward and feedbackward control, was used to speed up the res...
Noise produced by valves and regulators is now an increasingly critical consideration in plant design. The control valve noise problem involves not only occupational health and safety but also maintenance, structural fatigue, and system failure. The need for a better understanding of valve noise generation, measurement, prediction and reduction tec...
A method and apparatus for signal prediction using the estimate-maximize (EM) algorithm in a time-varying signal system is provided. A time function is used to appropriately weight, in complementary fashion, the significance of both the complete and incomplete data sets used by the EM algorithm over a time period of interest. Initially, the EM solu...
A method and apparatus for reducing drag and noise associated with fluid flow within a conduit is provided. The conduit has flexible walls that are shaped to form stationary waves having peaks and troughs and are repeated in the axial direction of the conduit. The stationary waves are moved along the axial direction of the conduit whereby a vortex...
A sound cancellation system has been developed to reduce the flow‐induced noise in piping systems under both steady‐state and transient conditions. A hybrid controller that combines both open‐loop and closed‐loop responses with adaptive digital signal processing and filtering techniques is utilized to speed up the response of the systemcontroller f...
An experimental study was conducted to investigate the chaotic motion, and flow?induced noise and vibration of confined jet flows in a cylindrical duct. Results from flow and acoustic measurements showed that the motion in pipe flow is random or chaotic, whereas the motion in confined jets is deterministic or orderly. Correlations of wall pressure...
The flow and acoustic characteristics of confined jets were measured by a laser Doppler velocimeter, flush‐mounted hydrophones, and accelerometers. Unrestricted pipe flow and flows restricted by various orifices were tested for a wide range of velocities to simulate the flow in piping systems. Wall pressure data showed that the noise levels vary wi...
A theoreticalmodel was developed to study the wall pressure and vibratory motion of an elastic pipe which is excited by a confined turbulent jet flow resulting from fluid flow through orifices in the pipe. Based on flow field measurements, the blocked surface pressure was calculated using Lighthill's method, and then used to drive the fluid?filled...
An experimental program was conducted in the acoustical water tunnel to determine the flow?induced noise and vibration on pipes due to various flow restrictors. Several flow restrictor configurations were tested for a range of flow velocities (up to 15 m/s). The flow configurations tested include: pipe flow, and flow restrictors with circular, coan...
An experimental investigation on the aerodynamic noise generation from control valves was conducted in a semi-anechoic facility. The noise spectral characteristics of several cage trim valves are presented. In general, broadband shock noise and turbulent mixing noise are the two major aerodynamic noise generation mechanisms.
Effect of forward speed on jet noise was quantified in acoustic wind tunnel. http://arc.aiaa.org/doi/abs/10.2514/3.58741?journalCode=ja
Tests were conducted of inverted velocity profile coannular nozzles and a conical nozzle in an acoustic wind tunnel facility to simulate flight effects on jet noise generation. Coannular model nozzles were tested at fan to core nozzle exit area ratios of .75 and 1.2. Fan stream jet velocity ranged up to 2000 fps at a variety of fan exhaust pressure...
Multi-walled carbon nanotube (MWNT) has been used to generate sound for underwater sound projectors, speakers, as well as cancellation source for active noise control system. If we reverse the process, how do we harvest the acoustical or vibration energy?
I'm using SoundPLAN to do indoor acoustic predictions, outdoor sound propagation and mapping, for industrial noise. Learning to run SoundPLAN is a challenge. I'm looking for alternative noise prediction and mapping programs.