Methods of evaluating mixing are disclosed relating to the preparation and mixing of materials. Materials prepared may transition from heterogeneous mixtures to homogenous mixtures while the current of a motor is monitored. Quantities relating to the rate of change of power or the rate of change of entropy may be calculated in evaluating the sufficiency of mixing. Methods of evaluating lubricant degradation are also disclosed.

A method for determining when to change a lubricating fluid flowing within an apparatus includes monitoring the lubricating fluid flowing within the apparatus by passing radiation through the lubricating fluid from a radiation source. The lubricating fluid is analyzed for a presence of particles in the lubricating fluid based on the radiation passing through the lubricating fluid. A concentration of the particles in the lubricating fluid is determined when the presence of particles is detected. An alert to change the lubricating fluid is generated when the concentration of particles in the lubricating fluid exceeds a threshold.

A method for determining when to change a lubricating fluid flowing within an apparatus includes monitoring the lubricating fluid flowing within the apparatus by passing radiation through the lubricating fluid from a radiation source. The lubricating fluid is analyzed for a presence of particles in the lubricating fluid based on the radiation passing through the lubricating fluid. A concentration of the particles in the lubricating fluid is determined when the presence of particles is detected. An alert to change the lubricating fluid is generated when the concentration of particles in the lubricating fluid exceeds a threshold.

Provided are oil mist measurement device and method capable of obtaining an oil mist concentration with higher accuracy and a compression system using the oil mist measurement device.

The oil mist measurement device of the present invention includes first-A and first-B detection sections 1A, 1B configured to detect measurement target pressures, a second detection section 2 configured to irradiate a measurement target with detection light to detect the intensity of light scattered by oil mist in the measurement target, and a concentration processing section 32 configured to correct the scattered light intensity detected by the second detection section 2 based on the pressures detected by the first-A and first-B detection sections 1A, 1B to obtain a corrected scattered light intensity thereby obtaining an oil mist concentration based on the obtained corrected scattered light intensity.

A whole-vehicle-based method for evaluating extreme pressure and antiwear properties of grease includes injecting the grease onto a key bearing pin and causing the engineering machine to operate without load is disclosed. The method includes causing the engineering machine to operate under a load of 10% to 150% rated load at least once, viewing and analyzing a wear condition of a surface of the bearing pin, and issuing a whole-vehicle-based evaluation report of extreme pressure and antiwear properties of grease. The engineering machine is caused to operate once under a load of 10% to 150% rated load for 0.5 min to 100 h.

A whole-vehicle-based method for evaluating extreme pressure and antiwear properties of grease includes injecting the grease onto a key bearing pin and causing the engineering machine to operate without load is disclosed. The method includes causing the engineering machine to operate under a load of 10% to 150% rated load at least once, viewing and analyzing a wear condition of a surface of the bearing pin, and issuing a whole-vehicle-based evaluation report of extreme pressure and antiwear properties of grease. The engineering machine is caused to operate once under a load of 10% to 150% rated load for 0.5 min to 100 h.

A device and method for measuring temperature during tribological examination of sample materials. More specifically, the device includes a sample holder that provides for surface temperature measurement for sample materials undergoing tribological testing.

A method for checking an oil as a lubricant for an internal combustion engine includes: performing a laboratory test in which, independently of the internal combustion engine, a three-dimensional temperature-viscosity-shear rate characteristic field which characterizes the oil is determined, which includes a plurality of viscosities, shear rates and temperatures of the oil determined experimentally by the laboratory test and in each case associates shear rates and viscosities with the temperatures; checking whether the temperature-viscosity-shear rate characteristic field meets at least one predeterminable first criterion; and if the temperature-viscosity-shear rate characteristic field meets the first criterion: performing at least one test bench trial in which, via the internal combustion engine, it is checked whether the oil meets at least one predeterminable second criterion.

A method for checking an oil as a lubricant for an internal combustion engine includes: performing a laboratory test in which, independently of the internal combustion engine, a three-dimensional temperature-viscosity-shear rate characteristic field which characterizes the oil is determined, which includes a plurality of viscosities, shear rates and temperatures of the oil determined experimentally by the laboratory test and in each case associates shear rates and viscosities with the temperatures; checking whether the temperature-viscosity-shear rate characteristic field meets at least one predeterminable first criterion; and if the temperature-viscosity-shear rate characteristic field meets the first criterion: performing at least one test bench trial in which, via the internal combustion engine, it is checked whether the oil meets at least one predeterminable second criterion.

A device measures a frictional force and a film thickness of a lubricating oil film in different surface velocity directions. The device includes an experiment bench. A translation stage is mounted to the experiment bench, and is linearly movable. A main shaft system is mounted to the experiment bench. A glass disc is mounted to the main shaft system and is rotatable. An arcuate guide rail is disposed on the translation stage. A rotary base is mounted to the arcuate guide rail and is movable along the arcuate guide rail. A loading system is mounted to the rotary base. A steel ball of the loading system and the glass disc are movable relative to each other. A rotary bearing in the rotary base is configured to convert a frictional force generated from the relative movement to a pressure allowed to be collected by a pressure sensor on the rotary base.