Torres P F, Whipp B J, Steen S N, Wasserman K
J Appl Physiol. 1975 Mar;38(3):554-7. doi: 10.1152/jappl.1975.38.3.554.
We have modified an electromagnetically braked cycle ergometer to provide a sinusoidally varying work load. This was accomplished by applying a low-frequency sinusoidal voltage at the inputs of the electromagnets using a sinusoidal potentiometer, whose shaft was driven by a variable-speed motor, and a voltage-programmable power supply to amplify the signal. The frequency range is currently 0.0017-0.3 Hz. This technique for sinusoidal work loads allow the period, amplitude, and mean position to be easily changed from a console, even during a test if required.
我们对一台电磁制动的自行车测力计进行了改进，以提供呈正弦变化的工作负荷。这是通过使用一个正弦电位器在电磁铁输入端施加低频正弦电压来实现的，该电位器的轴由一台变速电机驱动，还有一个电压可编程电源用于放大信号。目前的频率范围是0.0017 - 0.3赫兹。这种产生正弦工作负荷的技术使得周期、幅度和平均位置可以很容易地从控制台进行更改，甚至在需要时可在测试过程中进行更改。
