Seismic Approach to Quality Management of HMA
MnDOT Contract No. 1034287
Federal Project Number: TPF-5 (341)
Execution: January, 2020 - December, 2021
Park Seismic LLC, Shelton, Connecticut, Tel: 347-860-1223, Fax: 203-513-2056, Email: contact@parkseismic.com
PROJECT PROGRESS (March, 2020)
Summary

  • Hardware Parts Ordered

    Parts to build multichannel acquisition system (MAS) have been ordered at National Instruments (NI).  They are the main components
    needed to build a 64-channel acquisition system (expandable up to 96 channels).  Other accessory parts (e.g., MEMS microphones) will
    be ordered soon.


  • Optimum Number of Channels Per Array (March, 2020)

    The final system will consist of multiple linear (1D) MEMS microphone arrays arranged along the transverse direction side by side (see
    Figure 5 in the proposal).  It is critically important to figure out the optimum configuration of the one (longitudinal) array in the channel
    spacing (dx-opt) and the number of channels allocated per array (NCh-opt).  By using a field data set acquired with a 48-channel MEMS
    microphones with a very small channel spacing (i.e., dx=0.752 cm) (i.e., spatially over-sampled) over a special type of asphalt pavement
    in Sweden, a series of test have been executed through two types of spatial re-sampling approaches; i.e., the simple re-sampling of
    decimation and the stack-re-sampling approaches.  The former simply reselects existing traces (channels) from the original full (48-
    channel) field record with a greater spacing (e.g., 2dx, 3dx, 4dx, etc.) by discarding in-between traces.  On the other hand, the latter
    stacks (instead of discarding) them to make a new trace obtained with a greater spacing.  This stack approach, called "receiver array",
    has been used for a long time in the seismic exploration for the purpose of attenuating the strong, but propagating at very low velocity,
    ground roll surface waves.  These two re-sampling approaches are compared in the performance of enhancing the signal (Lamb) waves
    while attenuating the noise (air) waves at the same time.  

    According to the test results, it seems a 16-channel array with a 5dx (=3.76 cm), or a 4dx (=3.008 cm), channel spacing that connects
    (in parallel) all in-between MEMS microphones arranged with the current spacing of 0.752 cm.  This means the stack-re-sampling
    approach turned out more effective than the other simple re-sampling (decimation) approach.  With this configuration, the system will be
    able to handle HMA layers in a thickness (H) range of 4 cm (Hmin) - 20 cm (Hmax).  

    see SUMMARY of the procedures and results.

    see APPENDICES for procedural details.          

Project Tasks | Summary (see details)

    Task 1: Project Management and Administration
    Task 2: Hardware Development (Seismic Data Acquisition System) & Testing
    Task 3: Software Development & Testing
    Task 4: Delivery and Demonstration of Seismic Data Acquisition System and Software
    Task 5: Final Report

Year 1 (2020):

Year 2 (2021):
Progress Table (Prime Contractor - Park Seismic LLC) - March, 2020