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Chatter vibration highly limits the accuracy and the material removal rate of numerical control (NC) machining operations. In this paper, an adaptive spindle speed selection method, based on an analysis using the semi-discretization method, is proposed to avoid and minimize chatter vibration in high-precision NC machining. Moreover, the proposed method is robust to modeling uncertainty and changing...
Electric Vehicles (EV) equipped with independent drives are capable of controlling the car body motion in multiple degrees-of-freedom with driving force distribution through the suspension reaction force. These electric powertrains could thus suppress primary (1 – 3Hz) and secondary (4 – 10Hz) resonant modes improving ride comfort, road holding and safety of passenger cars. On-Board-Motor (OBM) drivetrains...
Research on the control using a load-side encoder for two-mass system is getting more active due to the widespread use of the load-side encoder. We previously proposed Self Resonance Cancellation, which is a position control method for two-mass system. SRC has steady-state error and the vibration suppression performance is not improved. In the industry, Proportional-Proportional Integral control is...
In vehicle motion control, it is important to improve both dynamic performance and ride comfort by vibration suppression. Vehicles with combustion engines or on-board motors can only suppress resonant modes in the low frequency band such as the heave, pitch, and roll modes due to the limitation in torque responsiveness. However, in the case of vehicles with in-wheel motors, it is possible to suppress...
The productivity of numerical control (NC) machining is highly limited by the occurrence of chatter vibration. Chatter stability analyses are widely studied to predict chatter vibration. However, these analyses often fail to provide reliable prediction results because the parameters in the vibration model are sensitive to identification errors, mechanical deterioration and thermal changes. On the...
In high-precision positioning of feed drive systems, mechanical resonances are one of the main limiting factor for fast and precise motion. Vibration suppression tracking controllers are employed to improve positioning performance, although precise plant models are generally required. Hence, in systems with time-varying modes, the increasing modeling errors often result in the loss of the needed performance...
Chatter vibration is well known as an undesirable phenomenon, so various methods for chatter suppression have been proposed. Spindle speed variation as a triangular trajectory in the cutting process is one of the methods for chatter suppression. However, this method cannot suppress chatter vibration completely. Moreover, the triangular spindle speed variation requires large torque and a good response...
For high-precision control of a two-inertia system, information of both the drive side and the load side is usually required for obtaining high control bandwidth. In order to reduce the implementation cost and space, a novel control method, which employs the load side information only, is proposed using a high-resolution encoder which is today widely used in various fields. Simulation and experimental...
IPMSMs (Interior Permanent Magnet Synchronous Motors) are widely used for many industrial applications. However, IPMSMs cause large noise and vibration due to torque ripple and radial force. In this paper, 6th radial force caused by harmonic current is analyzed and modelling of 6th radial force is constructed based on flux linkage Based on this modelling, 6th radial force is mitigated by injecting...
This paper proposes a spindle motor control method for self-excited chatter vibration suppression in numerical control (NC) machine tools. In conventional NC machine tools, spindle speed is set to constant value during machining, and the spindle speed is determined according to analysis or operator's experience. The proposed method reduces self-excited chatter vibration by varying spindle speed with...
IPMSMs (Interior Permanent Magnet Synchronous Motors) are widely used for many industrial applications. However, IPMSMs cause large noise and vibration due to torque ripple and radial force. In this paper, 6th radial force modelling is constructed based on flux linkage and 6th radial force is controlled on the ground of this modelling. Firstly, we make some assumptions to lead 6th radial force modelling...
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