In industries such as aerospace and seismic, test labs often perform complex shock tests using the shock response spectrum (SRS).<\/p>\n

The SRS uses a theoretical series of single-degree-of-freedom (SDOF) mass-damper-spring oscillators to model a test item\u2019s response to a shock event. It displays the absolute maximum acceleration of the SDOF oscillators at various natural frequencies in response to excitation. Although it is theoretical, the SRS provides valuable information about a test\u2019s maximum dynamic load as a function of frequency.<\/p>\n

Depending on the application, an engineer may also calculate the relative displacement or velocity during an SRS test. Velocity is directly related to product fatigue and is a good indicator of vibration severity. Displacement is beneficial for testing environments with low-frequency components, particularly in seismology and earthquake engineering.<\/p>\n

As the SRS is a function of frequency, engineers can convert the acceleration data to displacement and velocity and vice-versa. The absolute acceleration and relative displacement of an SDOF system are easily calculable, but it is common to approximate relative velocity as a pseudo velocity. Relative velocity is more difficult to accurately calculate, and the pseudo velocity can provide more useful information.<\/p>\n

Why Pseudo Velocity?<\/h4>\n

Test labs are most concerned about an excitation\u2019s potential damage. SRS acceleration quantifies a shock environment, helping to identify how a system would react to an excitation. The pseudo velocity measures the severity of the shock event and indicates potential damage.<\/p>\n

Pseudo velocity is a common requirement in naval applications and can be graphed as a pseudo-velocity SRS or a pseudo-velocity shock spectrum on four-dimensional paper.<\/p>\n","_single_calculator_duration":"","_single_calculator_form_markup":"","_single_calculator_javascript":"","_page_excerpt":"","_calculator_video_embed":"","_resources_video_thumbnail":"","_resource_hidden":"false","_single_experiment_content":"","_experiment_lock":"","_experiment_author":"","_experiment_date":"","_single_webinar_intro_image":""},"resource_types":[140],"resource_categories":[152,160],"class_list":["post-16285","resources","type-resources","status-publish","has-post-thumbnail","hentry","resource_types-calculations","resource_categories-shock","resource_categories-vibrationview"],"acf":[],"yoast_head":"\n