Nhat Tran, Tien Pham, Trung Trinh, Hai Tran, and Cong Bui


Optical device, collision safety, collision absorption


In recent years, there have been ground breaking advancements in the realm of artificial intelligence and the Internet of Things (IoT). These remarkable innovations have led to the extensive utilisation of optical scanning devices in a multitude of domains, including outdoor fixtures, mobile platforms, and unmanned aerial vehicles, for the purpose of capturing image data and real-time analysis. It is important to guarantee the safety of these technologies as they interact with their environment. Various studies have proven that both active and passive shock reduction strategies are highly effective in resolving this issue. Although each method has its own benefits and drawbacks, an integrated approach has been shown to significantly enhance overall protection and performance of a device. In particular, when it comes to optical scanning devices requiring minimal weight and a well-designed spatial configuration to reduce the strain on operational systems, the study has introduced a new safe joint module. This module utilises a direct-drive motor for real-time position control, enabling precise modification of control parameters within the operational range. Whenever the motor’s torque fails to offset inertial forces resulting in the rotor approaching its functional threshold, a spring mechanism is employed to dissipate the impact energy. Several collision simulations have demonstrated that the protective system is highly effective. The developed mechanism not only enhances efficiency in terms of size and weight but also improves damping effectiveness. It has achieved a 17.7% improvement at 9 g acceleration and 97% at 300◦/s while maintaining control accuracy within the operational range.

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