{"id":13638,"date":"2021-10-18T08:57:43","date_gmt":"2021-10-18T12:57:43","guid":{"rendered":"https:\/\/vibrationresearch.com\/?post_type=blog&p=13638"},"modified":"2024-01-26T15:09:19","modified_gmt":"2024-01-26T20:09:19","slug":"5-things-sine-random-shock","status":"publish","type":"blog","link":"https:\/\/vibrationresearch.com\/blog\/5-things-sine-random-shock\/","title":{"rendered":"5 Things to Know About Sine, Random, and Shock"},"featured_media":17664,"template":"","meta":{"_acf_changed":false,"_single_webinar_content":"","_webinar_lock":"","_webinar_author":"","_webinar_date":"","_webinar_duration":"","_webinar_hidden":"","_webinar_video_embed":"","_webinar_video_thumbnail":"","_column_content":"","_column_label":"","_column_url":"","_single_blog_intro_image":"","_single_blog_content":"

For those new to vibration testing, the vast knowledge on the subject can be overwhelming. Some basic information to get you started can go a long way, which is why we\u2019ve outlined five things you should know about the basic vibration tests: sine<\/a>, random<\/a>, and shock<\/a>.
\n<\/a><\/p>\n

Sine Testing<\/h3>\n
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  1. Purpose of Sine Testing<\/li>\n<\/ol>\n

    Sine testing is not comparable to the vibration we experience in the world. Rather, sine testing is a tool for engineering evaluation and equipment maintenance. Test engineers run a sine test for a defined purpose, knowing that its effect on the device under test (DUT) does not reflect the operational environment.<\/p>\n

      \n
    1. Phase<\/li>\n<\/ol>\n

      \"phase<\/p>\n

      A test engineer can compare two sine waves with the same frequency using phase. Two signals are out of phase when they are not at the same point in the cycle at a specified time.<\/p>\n

        \n
      1. Vibration Resonance<\/li>\n<\/ol>\n

        The sine test is one of the best methods for identifying resonances. Resonance occurs when the frequency of an external force is the same, or nearly the same, as a structure\u2019s natural frequency. This input amplifies the structure\u2019s frequency response, which will result in structural fatigue or damage.<\/p>\n

          \n
        1. Sine Sweep Test<\/li>\n<\/ol>\n

          To determine a resonance, a test engineer runs a sine sweep test. A sine sweep outputs a single sine tone with a frequency level that varies across a defined range.<\/p>\n

          TIP<\/strong>: A sine sweep may be a single run from a minimum to maximum frequency, from the maximum to minimum value, or from minimum to maximum and back to the minimum. The definition of a sweep depends on the software.<\/p>\n

          \"VibrationVIEW<\/p>\n

            \n
          1. Sine Resonance Track & Dwell (SRTD)<\/li>\n<\/ol>\n

            A test engineer runs an SRTD test after the sine sweep test determines the resonances. An SRTD test brings a product to failure by exciting the structure\u2019s known resonance(s). The vibration controller runs a single sine tone at the resonant frequencies rather than through the frequency range. The operator runs the test until failure occurs or sufficient time has passed without failure.<\/p>\n

            Popular Sine Glossary Terms<\/h4>\n