NASA-STD-5019, Fracture Control Requirement for Spaceflight Hardware (excerpt) 4.1.1.12 Low-Risk Part This section addresses parts that can be classified non-fracture critical because of large structural margins and other considerations that make failure from a pre-existing flaw extremely unlikely. a. For a part to be classified… Read more
Here is a Matlab script for the ground PPV: blast_ground_velox.zip References: http://www.dot.ca.gov/newtech/researchreports/reports/2001/vibrations.pdf ftp://ftp.odot.state.or.us/techserv/geo-environmental/Material%20Sources/Resources/Blasting_and_Community.pdf – Tom Irvine
A function for calculating blast & burst overpressure is given in: Matlab script: Vibrationdata Signal Analysis Package The function can be accessed via: >> vibrationdata > Miscellaneous > Blast & Burst Overpressure * * * WHAT HAPPENS WHEN A TIRE EXPLODES? Air Safety Week had… Read more
PowerPoint Slides: Webinar_33_Rainflow_Fatigue.pptx Audio/Visual File: NESC Academy Rainflow Fatigue – Recommend viewing in Firefox with Sliverlight Plugin * * * References: Steinberg’s Vibration Analysis for Electronic Equipment Rainflow Fatigue Posts * * * Matlab script: Vibrationdata Signal Analysis Package * * * See also: Vibrationdata… Read more
PowerPoint Slides: Webinar_32_circuit_board_fatigue.ppt Audio/Visual File: NESC Academy Electronic Circuit Board Fatigue Part I – Recommend viewing in Firefox with Sliverlight Plugin * * * References: Steinberg’s Vibration Analysis for Electronic Equipment Extending Steinberg’s Fatigue Method Design and Process Guidelines for Use of Ceramic Chip Capacitors… Read more
PowerPoint Slides: Webinar_31_rectangular_circular_plates.pptx Audio/Visual File: NESC Academy Rectangular & Circular Plate Shock & Vibration – Recommend viewing in Firefox with Sliverlight Plugin * * * References: Leissa, Vibration of Plates Rayleigh Method circular.pdf fixed_free_fixed_free_plate.pdf * * * Matlab script: Vibrationdata Signal Analysis Package Data files included in… Read more
PowerPoint Slides: Webinar_30_rectangular_plates.pptx Audio Visual File: NESC Academy Rectangular Plate Shock & Vibration – Recommend viewing in Firefox with Sliverlight Plugin * * * References: Leissa, Vibration of Plates Plate Base Excitation: plate_base_excitation.pdf The Natural Frequency of a Rectangular Plate Point-Supported at Each Corner: plate_point_corner.pdf * *… Read more
Professor Shnayer Z. Leiman wrote: “This too shall pass” is an adage that has provided succor for many a person in distress. It is a powerful reminder that life does not stand still, and that one must always anticipate change, hopefully for the better. Much… Read more
PowerPoint Slides: Webinar_29_stress_velocity.pptx Audio Visual Files: Recommend viewing in Firefox with Sliverlight Plugin NESC Academy Stress-Velocity Relationship Part I NESC Academy Stress-Velocity Relationship Part II * * * Acceleration Time History: Time (sec) & Accel (G) srs1000G_accel.txt * * * References: Stress-Velocity Relationship: sv_velocity.pdf Bending Frequencies of… Read more
PowerPoint Slides: Webinar_28_mdof_SRS.pptx Audio/Visual Files: Recommend viewing in Firefox with Sliverlight Plugin NESC Academy Multi-degree-of-freedom SRS Part I NESC Academy Multi-degree-of-freedom SRS Part II Three-dof System Example: three_dof_srs_revC.pptx * * * Acceleration Time History: Time (sec) & Accel (G) srs2000G_accel.txt * * * References:… Read more