Engineering English
Frequency Response Function
Mechanical Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: A frequency response function is a mathematical representation of how a system responds to an input excitation at different frequencies. It is typically expressed as a complex ratio of output to input in the frequency domain.
Example in context
“The engineer used a frequency response function to identify the resonant peaks of the rotor-bearing system during startup.”
“Mühendis, rotor-yatak sisteminin başlangıç sırasında rezonans tepelerini belirlemek için frekans cevap fonksiyonu kullandı.”
Where engineers use it
The frequency response function is measured using an impact hammer or shaker test and is plotted on a Bode or Nyquist diagram. Engineers rely on it during modal analysis to extract natural frequencies, damping ratios, and mode shapes.
Synonyms: FRF, transfer function
Antonyms: time response
Practice: can you use “Frequency Response Function” at work?
A vibration engineer is troubleshooting excessive amplitudes in a fan. They need to explain how measuring the frequency response function can help identify the root cause.
Show a model answer
“Plot the frequency response function for the system to evaluate its dynamic characteristics.”
“Frequency Response Function” in 21 languages
| English | Frequency Response Function |
|---|---|
| Turkish | frekans cevap fonksiyonu |
| French | fonction de réponse en fréquence |
| German | Frequenzgangfunktion |
| Spanish | función de respuesta en frecuencia |
| Chinese | 频率响应函数 |
| Arabic | دالة الاستجابة الترددية |
| Portuguese | função de resposta em frequência |
| Russian | амплитудно-частотная характеристика |
| Japanese | 周波数応答関数 |
| Italian | funzione di risposta in frequenza |
| Vietnamese | hàm đáp ứng tần số |
| Hindi | आवृत्ति प्रतिक्रिया फलन |
| Thai | ฟังก์ชันตอบสนองความถี่ |
| Indonesian | fungsi respons frekuensi |
| Korean | 주파수 응답 함수 |
| Bengali | ফ্রিকোয়েন্সি রেসপন্স ফাংশন |
| Dutch | frequentieresponsfunctie |
| Swedish | frekvenssvarsfunktion |
| Finnish | taajuusvastefunktio |
| Ukrainian | амплітудно-частотна характеристика |
Frequently asked questions
What does Frequency Response Function mean in engineering?
A frequency response function is a mathematical representation of how a system responds to an input excitation at different frequencies. It is typically expressed as a complex ratio of output to input in the frequency domain. In Mechanical Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Frequency Response Function?
Frequency Response Function is pronounced /ˈfriːkwənsi rɪˈspɒns ˈfʌŋkʃən/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Frequency Response Function used in a sentence?
Example from an engineering context: “The engineer used a frequency response function to identify the resonant peaks of the rotor-bearing system during startup.”
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