I have added an exponential decay option to the wavelet synthesis function. This arranges the wavelets so that they will “resemble” a pyrotechnic-like time history. The function is included in the GUI package at: Matlab Link Note that the conservative ramp-plateau enveloping in the SRS… Read more
Transforming Complex Mode Shapes into Real, Undamped Shapes
Modal test data processing methods perform curve-fitting on measured frequency response functions. These are indirect methods for extracting natural frequencies and damping ratios. The FRF methods also yield mode shapes which may be complex if the system has non-proportional damping. Each complex mode shape can… Read more
Material Damping
Internal friction and heat generation cause a deviation from perfect elasticity, resulting in the hysteresis loop in the stress-strain curve. The damping capacity ψ is: ψ = ΔW/W where W is the initial strain energy and ΔW is the energy lost during one cycle of oscillation. Some damping capacities… Read more
Shock & Vibration Test Fixture Design
Introduction Vibration test fixtures are the mechanical interface between the shaker system and the unit under test (UUT). Their purpose appears simple: hold the test item securely and transmit the specified vibration input. In practice, fixture design is one of the most important and often… Read more
Architectural Helmholtz Resonators
Tapiola Lutheran Church in Espoo, Finland, Opened in 1965 Helmholtz-type resonators are built into the walls of the church. The slots between brick pairs and cavities behind them act as both absorbers and diffusors of sound. The absorption reduces the reverberation time as desired for… Read more
Material Shock Loading
The plot shows the applied strain on the horizontal axis and the resisting stress on the vertical axis. The area inside the triangle represents the maximum energy that can be absorbed elastically, if the member is strained up to its proportional limit stress. The member… Read more
Golden Gate Bridge Singing
Some San Francisco Bay Area residents from Marin County to the Presidio have noticed a sustained, series of high-pitched tones. The sound reached a new peak volume, and recordings of the eerie noise spread across social media in early June,. The sound is due to… Read more
PSD Fatigue Damage Severity Criteria
PV = pseudo velocity The following method is intended for components which are to be tested to power spectral density (PSD) specifications on shaker tables. The method can be applied to sine-on-random specifications as well. The purpose of this document is to recommend velocity severity… Read more
Without Expectation of Something in Return
To help others is the path of discipleship. Faith, hope, love, compassion, and service refine us as disciples. Through your efforts to help the poor and the needy, to reach out to those in distress, your own character is purified and forged, your spirit is… Read more
Hot Fire Test of an Upper Stage Rocket Engine
Liquid fuel rocket engines undergo hot fire testing before flight in order to verify their performance, design integrity, etc. The engines are mounted to heavy-duty, immovable stands for this purpose. These tests are also referred to as static fire tests. Furthermore, the tests are almost… Read more