<![CDATA[Cardiopulmonary Resuscitation (CPR) is an emergency medical procedure performed on patients experiencing cardiac arrest. In this study, the mechanical response of the human chest during CPR compression is modeled using a spring–damper system. To better represent the actual chest response, the damper is regulated using a control system integrated into a CPR training model. The overall system design, including the human chest response model and the control system, utilizes a spring mechanism, an HC-SR04 ultrasonic sensor for measuring compression depth, LED indicators, and a buzzer as feedback components. A user interface (UI) is also developed to operate and monitor the entire system. The damping setpoint is designed with a variable viscosity constant that changes according to the chest compression depth, approximating the characteristics of the human chest response. A PID controller with gains , , and is implemented. The system produces an output response with a settling time of 5 seconds and a total error of 0.4457. The calculated compression force ranges from 320 to 420 N for compression depths of 4–5.5 cm.]]>
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