Reuben Hale, P.E.
Ph: (510) 507-1300
Response Dynamics has been providing vibration and acoustic consulting services in the Silicon Valley area, nationally, and worldwide for over 30 years. Our vibration consulting services include vibration testing and vibration analysis, experimental design, instrumentation, digital signal processing, and engineering design. As Acoustic Consultants, our services dovetail with our structural dynamics and vibration expertise.
Response Dynamics is a dedicated team of engineers with focus on vibration related issues. As vibration consultants, we work on a wide variety of products, machines, and tools in all fields and industries that include: consumer products, novel medical devices ranging from small eye surgical tools to large surgical robots, a myriad of automated high resolution tools in the biotech and semiconductor industries, terrestrial mountain top telescopes, offshore oil rigs and dynamic positioning vessels, construction equipment ranging from laser guided graders to simple hammers, solar arrays, Tesla's electric cars, power generation plants, disk drive and computer products, military hardware, aerospace guidance systems, gadgets, and everything in between. (See our Client list by industry).
|Optical Mirror Actively Controlled, |
Secondary Resonaces Limit Bandwidth
|Damping Treatments Include Tuned Mass |
Dampers When Appropriate
Dynamic Testing is the backbone of much of our work as a vibration consultants, it is the basis of vibration analysis and Modal Analysis testing, and a powerful tool in identifying cause and effect in our Diagnostic Testing. We often perform a vibration characterization along with Dynamic Tests (Force & Response measurements) to determine the structural dynamics that influence resonant amplification and transmission from the disturbance sources to the critical structures. We use our estimates of the dynamic parameters to suggests structural modifications, and often create optimized custom Damping Treatment Designs.
As vibration consultants, we work with our client's engineering team to make the vibration problem understandable, providing guidance in experimental design. We select and provide the instrumentation to do testing and analysis to characterize the problem and quantify the important components of the problem. We provide visualization of structural issues and allow the team to optimize practical and engineered solutions, based on valid test data, in a short time frame.
|Tools of the Trade, Amplifiers, Filters, |
Shakers, Force Sensors, Accelerometers
|Operating Deflection Shape of a Building|
We have developed and refined measurement techniques to sort out acoustically driven vibration, environmental vibration, and internal vibration sources. We can provide The Big Picture by showing how the dynamics of a structure and the surrounding environment couple to provide the transmission of vibration from these various sources to the critical components of the tool.
We use a wide variety of instrumentation including accelerometers of various sizes and sensitivities each suited for specific purposes. We use geophones and seismographs where needed. We use relative dispacement sensors of various kinds including capacitive sensors, and eddy current probes and optical sensors, in a variety of geometries and sensitivities and eddy current probes. We understand the idiosyncrasies and limitations of instrumetation that include the frequency response, thermal noise, cross-coupling, electical noise sensitivity, and linearity. We also know the digital signal processing side of our business.
|Self-Induced Vibration: Control Instability, Transient Ringdown After Move, Engine Vibration|
We have worked on a myriad of systems. From nanometer level disturbances of scanning electron microscopes, to micron level motions of giant mountain-top telescopes, to centimeter level motions of offshore oil rigs. We have worked on hundreds of industrial, biomedical, semiconductor, and commercial systems worldwide to improve performance, and to solve imaging, measurement, vibration and acoustic issues.
In addition to:
our vibration testing and analysis services also include the following:
The Frequency Response Function (FRF) involves measurement of the response at a given point on a structure, per unit input force at another point as a function of frequency. The ratio of the response to the input force as a function of frequency is called the Transfer Function, or the Frequency Response Function (FRF). We can use a measured impulse (like a tap) to excite a structure, or use an electrodynamic shaker using full spectrum force excitation. Measurement of the frequency response function (FRF) is our most powerful tool. It contains the “fingerprint” of the inherent structural dynamics of a system. The resonant parameters can be extracted numerically from these FRFs and include the resonant frequencies, the local stiffness, and damping.
We work with archetechtual teams in the planning of new Facilities, and in repurposing existing facilities, providing guidance in translating vibation and acousitc requirements into design specificaitons, and taking on unique design challenges. Our work includes projects ranging from semiconductor cleanrooms, laboratories, hospitals, office buildings, and industrial facilities. We provide testing, analysis, of existing sites to quantify the vibraiton and acoustic paramenters needed to properly characterize an existing site. (See our Client list by industry).
- Vibration Consulting Topics Include:
Overview, Vibration Characterization, Dynamic Testing, Damping Treatments, Time Domian Analysis