In the ever-evolving landscape of construction machinery, a groundbreaking study has emerged that could significantly impact the way we monitor and maintain hydraulic systems. Akira Kurasako, a leading researcher from the Research & Development Group at Hitachi Construction Machinery Co., Ltd., has published a study in the journal ‘Tribology Online’ (translated to English as ‘Friction and Wear Online’) that delves into the applicability of online oil condition monitoring systems to biodegradable hydraulic oil.
The research focuses on the temperature characteristics of biodegradable hydraulic oil, using an oil sensor to verify the correlation between sensor measurement values and oil properties as the oil deteriorates. This is a crucial area of study, as the shift towards more environmentally friendly hydraulic oils is gaining momentum in the construction industry.
Kurasako’s findings reveal that biodegradable oil and mineral oil have equivalent kinematic viscosity characteristics, but the density of biodegradable oil is approximately 1.05 times that of mineral oil, and the dielectric constant is approximately 1.5 times higher. “This linear change trend with temperature change confirms that temperature correction is possible using the same method as used for mineral oil,” Kurasako explains. This is a significant discovery, as it suggests that existing monitoring systems can be adapted to work with biodegradable oils without extensive modifications.
However, the study also highlights that the change rate for total acid number increase in the sensor value for biodegradable hydraulic oil is smaller than that for mineral oil. This indicates that a new evaluation criterion is needed for biodegradable oils. “This is a critical finding,” Kurasako notes, “as it underscores the need for tailored monitoring approaches for different types of hydraulic oils.”
The research also confirms that mineral oil, biodegradable oil, or a mixture of the two can be roughly estimated in a hydraulic excavator by using the characteristics of the difference in density and dielectric constant between biodegradable oil and mineral oil. This could have significant commercial implications for the energy sector, as it paves the way for more accurate and efficient monitoring of hydraulic systems in construction machinery.
The study’s findings could shape future developments in the field by driving the creation of more sophisticated and tailored oil condition monitoring systems. As the construction industry continues to embrace more environmentally friendly practices, the demand for effective monitoring solutions for biodegradable hydraulic oils is set to grow. Kurasako’s research is a significant step in this direction, offering valuable insights that could guide the development of new monitoring technologies.
In the words of Kurasako, “This research is not just about understanding the behavior of biodegradable oils; it’s about paving the way for a more sustainable future in the construction industry.” As the industry continues to evolve, studies like this one will be instrumental in driving progress and innovation.