拇指弹琴触键动作测量与分析

Measurement and analysis of thumb key-touching

拇指弹琴触键是一项涉及多因素的复杂空间运动,其量化分析对于钢琴教学的科学指导和教学效果的量化评价至关重要。针对钢琴教学早期阶段拇指高抬指触键动作训练,提出了一种测量与分析方法。首先采用Leap Motion传感器搭建测量平台,进行人手弹琴触键动作数据采集。其次建立手部关节坐标系,设定表征拇指弹琴触键运动的角度参数。然后利用最小二乘法获得拇指弹琴触键的运动回归方程。最后依据回归方程预测拇指在弹琴触键过程中各关节角度参数的变化规律。该研究可为不同拇指长度的人提供拇指弹琴触键运动预测曲线,为钢琴弹奏和学习效果评价提供科学指导,并为后续的钢琴教学机械手设计提供理论依据。

The thumb key-touching is a complex spatial movement which involves many factors. Its quantitative analysis is very important for the scientific guidance of piano teaching and the quantitative evaluation of teaching effect. This paper puts forward a measurement and analysis method for the training of thumb key-touching in the early stage of piano teaching. Firstly, the Leap Motion is used to build the measurement platform to collect the motion data of key-touching. Secondly, the hand joint coordinate systems are established, and the angle parameters representing the movement of thumb key-touching are set. Then the least square method is used to obtain the motion regression equation of the thumb key-touching. Finally, according to the regression equation, the change law of joints’ angle parameters in the process of thumb key-touching is predicted. This study can provide prediction curves of thumb key-touching motion for people with different thumb lengths, provide scientific guidance for piano playing and learning effect evaluation, and provide a theoretical basis for the follow-up design of piano teaching manipulator.