James C. Akers |  Michael T. Hale... -  《Sensors and Instrumentation, Aircraft/Aerospace and Dynamic Environments Testing: Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics 2022, v.7》 -  IMAC Conference and Exposition on Structural Dynamics - 2023, - 145～160 - 共16页

摘要：As test articles become dimensionally larger, more complex, and massive in weight, combined with the need to excite them to higher than traditional levels in order to identify their nonlinear characte...

关键词： Electrodynamic modal shakers |  Hydraulic modal shakers |  Hydraulic power supplies |  Large-scale modal test |  Nonlinear distortion

NSTL主题词： Vibration |  Hydrodynamics |  large sizes

James C. Akers |  Mark E. Ankrom... -  《Topics in Modal Analysis & Parameter Identification: Proceedings of the 40th IMAC, A Conference and Exposition on Structural Dynamics 2022, v.8》 -  IMAC Conference and Exposition on Structural Dynamics - 2023, - 155～164 - 共10页

摘要：Engineers need to effectively communicate the justification and value of their modal testing and model correlation in terminology familiar to decision makers as it relates to the program's risk tolera...

关键词： Decision maker |  Cost |  Schedule |  Risk |  Modal testing |  Model correlation |  NASA |  Young engineer |  Satellite |  Spacecraft

NSTL主题词： decision makers |  Engineers |  Youth

Michael T. Hale |  William Barber... -  《Journal of the IEST》 - 2022,65(1) - 1～20 - 共20页

摘要：As multiple degree-of-freedom excitation systems continue to evolve and become standard hardware in many dynamic test facilities, there continues to be a lag in the development of associated spectral ...

关键词： vibration specification development |  acceleration transformation |  coordinate frame |  spectral density matrix |  motion space |  measurement space |  6-DOF |  MDOF |  SDOF

Michael T. Hale |  Trideum Corporation -  《Journal of the IEST》 - 2017,60(1) - 31～41 - 共11页

摘要：Method 519.7, Annex D of MIL-STD-810G, Environmental Engineering Considerations and Laboratory Tests, Change Notice 1 (MIL-STD-810G/CN1) outlines a prediction methodology for establishing a sine-on-ra...

关键词： Gunfire |  Time Waveform Replication (TWR) |  Sine on Random (SoR) |  Synthesis Techniques |  Temporal Characteristics

Michael T. Hale |  Trideum Corporation -  《Journal of the IEST》 - 2017,60(1) - 21～30 - 共10页

摘要：Reference criteria for a multiple degree-of-freedom (MDOF) random vibration test is generally provided in terms of an acceleration-based spectral density matrix (SDM). This SDM may be developed in ter...

关键词： Spectral Density Matrix (SDM) |  Transformation |  Six Degrees of Freedom |  6-DOF |  Motion Space |  Measurement Space |  Coordinate Frame

Michael T. Hale |  William A. Barber... -  《Journal of the IEST》 - 2015,58(1) - 37～58 - 共22页

摘要：Multiple-degree-of-freedom (MDOF) excitation systems vary widely in performance, size, actuator selection, and general geometric configuration. When acquiring an MDOF excitation system it is imperativ...

关键词： 6 degrees of freedom (6-DOF) |  servo-hydraulic |  reaction mass |  hydraulic power supply

Michael T. Hale |  William A. Barber... -  《61st annual technical meeting of the Institute of Environmental Sciences and Technology: 61st annual technical meeting of the Institute of Environmental Sciences and Technology (ESTECH 2015), 27-30 April 2015, Danvers, Massachusetts, USA》 -  Annual technical meeting of the Institute of Environmental Sciences and Technology - 2015, - 475～496 - 共22页

摘要：Multiple Degree of Freedom (MDOF) excitation systems vary widely in performance, size, actuator selection and general geometric configuration. When acquiring a MDOF excitation system it is imperative ...

关键词： 6 Degree-of-Freedom (6-DOF) |  Servo-Hydraulic |  Reaction Mass |  Hydraulic Power Supply

NSTL主题词： DNA Integration |  integration |  exciters

Michael T. Hale |  William A. Barber -  《Journal of the IEST》 - 2013,56(2) - 43～56 - 共14页

摘要：The generation of Gaussian noise with a specific auto spectral density (ASD) is a well-documented process employed in drive signal generation in vibration control applications. In recent years, vibrat...

关键词： Kurtosis |  fatigue |  probability density function

Michael T. Hale |  William A. Barber -  《Journal of the IEST》 - 2013,56(Spec.) - 43～56 - 共14页

摘要：The generation of Gaussian noise with a specific auto spectral density (ASD) is a well-documented process employed in drive signal generation in vibration control applications. In recent years, vibrat...

关键词： Kurtosis |  fatigue |  probability density function

Michael T. Hale |  Jesse F. Porter -  《Journal of the IEST》 - 2012,55(1) - 10～24 - 共15页

摘要：Multiple Degree of Freedom (MDOF) excitation systems and MDOF vibration control systems continue to improve, and are now standard equipment in many dynamic test laboratories. Determination of an input...

关键词： Spectral Density Matrix (SDM) |  6-degree-of-freedom (6-DOF) |  acceleration transformation