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View from the Horton Grand


Lots of people have heard of the Horton Grand Hotel in downtown San Diego, CA. Here's a view of the hotel that not too many people see - a view from the roof of this historic building. 

ISE was involved in a forensic case that required us to do some work on top of the hotel. The view is a panoramic one close to sunset looking towards the west towards Seaport Village and the convention center. 

Olivenhain Dam Construction Site

Here's a photo from the archives of the Olivenhain Dam inundation area circa 1998 prior to construction of the dam. ISE took this photo during some early field reconnaissance of the site to quantify some of the site constraints. This area is now currently under approximately 200-feet of water.

The blasting vibration data obtained from this site was instrumental in developing a new seismic surface wave prediction model - the R-Wave model.

Civil Modal Analysis

We've received several inquiries on how civil modal analysis is performed and what instruments are used. 

Shown in the photo is ISE's 'modal sledgehammer' capable of producing an impulsive force on an object with magnitudes up to 5,000 pounds. The force is measured through a pressure transducer in the head of the hammer (the silver part shown) while the tip of the hammer (the grey part) is adjustable with different tips of varying hardness allowing us to control the frequency content of the impulse (i.e., the harder the tip material, the higher the frequency roll-off).

One Way to Stop Noise

We're not sure how well this works, but you have the give the City of San Francisco a 'A' for effort.

This sign is located at the bottom of Lombard Street on Russian Hill between Hyde and Leavenworth Streets stating that noise is strictly forbidden (and to think, we've been doing it the hard way all these years when all we needed to give our clients was a street sign).

Incidentally, Lombard Street is also known as the 'crookedest street in the world' for within this particular one-block section, there are eight sharp turns (or switchbacks) to temper the streets 51% grade (a real hazard for modern cars let alone the Ford Model T when the road was built in 1922).

Advanced Acoustical Modeling Using IS3

The current version of the ISE Industrial Source Model (IS3) is sure to make the competitors cringe. Version 3.9 touts some highly advanced features such as the ability to model complete internal reflection, multiple material attenuative sources, variable propagation rates and source types, and atmospheric scattering effects.

This version, in addition to representing a complete overhaul of the code, was optimized to  streamline the input and output tasks for the end user. Adaptation of the Apple XGRID technology is currently being examined as a variant to the IS3 program, since most internal tasks can be performed in a parallel fashion.

Other firms merely talk about being able to do noise contouring; ISE sets the standard by developing the technology and taking the visualization process to levels 'unheard of' before. Imagine what IS3 could do for your project...  

ISE is currently woking away on Version 4.0 of the IS3 Model. This program build, in addition to including yet more features and far-field physics, is expected to be ISE's first commercial release of the product for use by everyone. Stay tuned for more details.