{"id":7319,"date":"2023-05-12T09:51:56","date_gmt":"2023-05-12T07:51:56","guid":{"rendered":"https:\/\/wp.delphin.de\/?post_type=glossar&#038;p=7319"},"modified":"2026-06-24T14:43:04","modified_gmt":"2026-06-24T12:43:04","slug":"fft","status":"publish","type":"glossar","link":"https:\/\/www.delphin.de\/en\/glossar\/fft\/","title":{"rendered":"FFT | Fast Fourier Transform"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The <strong>Fast Fourier Transform (FFT)<\/strong> is a mathematical method in digital signal processing that can be used to decompose time-dependent measurement signals into their individual frequency components. It is a particularly efficient method for performing the Fourier transform and is one of the most important tools in vibration, acoustics, and condition analysis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While measured values are typically plotted as a function of time\u2014that is, as a sequence of measured values over time\u2014the FFT allows them to be converted into the <strong>Frequency range<\/strong>. There, you can see which frequencies a signal consists of and at what intensity they occur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From a time signal, information such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Frequency components<\/li>\n\n\n\n<li>Amplitudes<\/li>\n\n\n\n<li>Phase Relations<\/li>\n\n\n\n<li>Dominant Vibration Frequencies<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">determined and graphically represented as a frequency spectrum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Analysis in the frequency domain offers significant advantages, as many processes and causes of errors can be detected much more easily there than in the time domain alone. Periodic signals, oscillations, and recurring disturbances, in particular, can be clearly identified by their characteristic frequency components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Applications of the FFT in Measurement and Vibration Technology<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FFT is used in numerous areas of industrial measurement technology, particularly in the monitoring of machines and systems. By analyzing vibration signals, early signs of wear, imbalance, or defects can be detected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical applications are<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vibration Analysis of Machinery<\/li>\n\n\n\n<li>Condition Monitoring of Rotating Equipment<\/li>\n\n\n\n<li>Bearing Diagnosis<\/li>\n\n\n\n<li>Unbalance Analysis<\/li>\n\n\n\n<li>Shaft and Drive Monitoring<\/li>\n\n\n\n<li>Resonance and Frequency Analyses<\/li>\n\n\n\n<li>Acoustic and Noise Measurements<\/li>\n\n\n\n<li>Predictive maintenance and condition monitoring<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For example, damaged bearings, imbalances, or faulty gear components produce characteristic frequency patterns. These can be identified and evaluated using FFT analysis, often long before an actual failure occurs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">FFT in Delphin Measurement Systems<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With the <strong><a href=\"https:\/\/www.delphin.de\/en\/products\/measuring-testing-devices\/vibration-measurement-expert-vibro\/\" data-type=\"produkt\" data-id=\"2123\">Expert Vibro<\/a><\/strong> FFT calculations can be performed directly online in the measuring instrument. This makes frequency spectra and vibration analyses available in real time, without the need to first process the raw data externally.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This enables continuous monitoring of machines and systems, as well as the automatic detection of critical operating conditions directly during data collection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages of the FFT<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fast Conversion of Time-Domain to Frequency-Domain Signals<\/li>\n\n\n\n<li>Detailed Analysis of Complex Oscillations<\/li>\n\n\n\n<li>Early Detection of Machine Malfunctions<\/li>\n\n\n\n<li>Support for Condition Monitoring Systems<\/li>\n\n\n\n<li>Real-Time Analysis in Modern Measuring Instruments<\/li>\n\n\n\n<li>Efficient Processing of Large Amounts of Data<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The Fast Fourier Transform is therefore an indispensable tool in modern vibration analysis and condition monitoring. It provides in-depth insights into the behavior of technical systems and supports the early detection of faults and signs of wear.<\/p>","protected":false},"featured_media":0,"template":"","class_list":["post-7319","glossar","type-glossar","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/glossar\/7319","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/glossar"}],"about":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/types\/glossar"}],"wp:attachment":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/media?parent=7319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}