\u003cp\u003e\u003cb\u003ePrimary\u003c/b\u003e: Researchers and mechanical engineers who are new to the subjects of vibrations, signal processing and vibration testing. \u003c/p\u003e \u003cp\u003e\u003cb\u003eSecondary\u003c/b\u003e: Senior undergraduate students, MSc students and PhD students.\u003c/p\u003e