Multi-channel active gear pair vibration control with an electronically commutated motor as actuator

Abstract

Due to the growing importance of electro mobility, the requirements in terms of noise and vibration harshness for drive trains with gearboxes driven by electronically commutated motors are continually increasing. A dominant component of the airborne sound emitted by such drive trains is the gear meshing sound originating from dynamic transmission errors. These nondesirable dynamic transmission errors show frequency components at gear mesh frequency as well as in its harmonics. In application these harmonics cause non-desirable high frequency components in the airborne sound. This paper presents a multi-channel adaptive feed-forward controller that is based on the LMS algorithm where the controller uses the electronically commutated motor as actuator. The dynamic behavior has been studied in simulation with a permanentmagnet synchronous motor and a two-degree-of-freedom gear pair model with an angle-dependent spring stiffness, a viscous damper and a transmission error excitation. Results showed that the controller is able to decrease the dynamic transmission error at gear mesh frequency and three additional harmonics simultaneously. Within the scope of this work, experiments have been carried out on a hardware-in-the-loop test bench including a permanent magnet synchronous motor with two gear stages and a magnetic particle break as load. Measurements show a housing vibration reduction of 31 dB and an airborne sound reduction of 13 dB at first gear mesh frequency. At second gear mesh frequency the controller reduces the structure borne sound by 18 dB and airborne sound by 15 dB.

A fundamental investigation of the interaction and impact of controlled torque ripples on gear mesh dynamics

“…Electric and hybrid-electric vehicles hold an advantage in this regard as they already have an actuator that can be used to reduce gear whine noise, i.e., the traction motor, making it easier to meet packaging and financial constraints. Such an approach was demonstrated by Benzel and Möckel [3] in which they were able to achieve a net reduction of 12 dB in the housing vibration. In [2], it was further shown that the system is effective for varying speeds and loading conditions, as well.…”

Active vibration control of gearbox housing using inertial mass actuators

“…They achieved 8-13 dB attenuation in the gearbox housing vibration levels and correspondingly 5-8 dB reduction in measured gear whine noise levels at the first and second operating gear mesh frequencies. Benzel and Mockel [9,10] presented an active control system to suppress gear pair vibrations utilizing an electronically commutated motor as an actuator. They proposed an adaptive feed-forward controller based on the Filtered-x Least Means Squares (FxLMS) algorithm capable of attenuating gear pair vibration in a helical gear pair system.…”