Abstract
Vehicles commonly suffer from the narrow-band noises and vibrations, usually a superposition of multiple sinusoidal signals, due to the excitations of engines, electrical motors, gear boxes, and other rotating mechanical parts. These excitations are transmitted to a reference point of some structure with certain transmission paths. The vibration signal measured at the reference point can be used for power system monitoring, fault diagnosis, modal analysis, noise analysis, etc. For convenience, researchers in a laboratory usually use shakers to generate expected narrow-band vibration signals acting on the vehicle structure reference points to simulate the vibration signals. However, there is a prominent difficulty in ensuring the amplitude and phase accuracy of each sub-frequency component simultaneously. In order to improve the accuracy of generating the expected vibration signal, this paper presents a multi-source vibration simulation control technology based on the tracking filter method. The main idea is to use the tracking filter to estimate the amplitude and phase of the target sub-frequency component accurately. Further, on the target sub-frequency, the drive signal of shakers is then corrected based on the amplitude and phase errors to achieve a more accurate target vibration signal. The amplitude and phase of each sub-frequency component in the excitation signal can be controlled independently. Compared with other Fast Fourier Transform (FFT)-based frequency domain analysis algorithms and numerical methods by solving the equations, the tracking filter method has a higher frequency resolution and higher accuracy. It can be easily realized in real time applications due to its simplicity. Finally, verification experiments are completed. The experimental results show that the multi-source vibration simulation control technology presented in this paper can achieve high-precision amplitude and phase on each sub-frequency component of the target vibration signals, which contain up to eight sub-frequency components.
Highlights
Engines and electrical motors are the core components of vehicles’ power systems
From From this literature, it is that in some in some circumstances of faulty diagnosis and noise control, the key information contained in the circumstances of faulty diagnosis and noise control, the key information contained in the vibration vibration and noise signals are presented as some special combinations of sinusoidal signals
TheseThese vibration vibration and noise signals are always collected under working condition, so it may be not convenient and noise signals are always collected under working condition, so it may be not convenient to get to get them handily
Summary
Engines and electrical motors are the core components of vehicles’ power systems. Together with gear boxes and other rotating mechanical parts in the kinematic chains, they produce vibration forces impacting the vehicle’s vibration and noise environment [1,2,3,4]. Researchers prefer to use a single shaker to generate a excitation containing multiple frequency components. The parallel tracking filters are used to estimate each frequency component’s amplitude and phase independently, which yields high frequency compared with other phase-recursive methods. The parallel tracking filters are used to estimate each frequency component’s amplitude and phase independently, which yields high frequency resolution and effective reduction of the mutual influence between frequency components [15]. All of these technologies are combined to achieve a high-precision control result for each frequency component’s amplitude and phase
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