Investigation of complex surfaces of propellers of vehicles by a mechatronic profilograph

OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 4 Conclusions 1. Anew method for studying complex surfaces of propellers of vehicles and the design of a mechatronic pro fi lograph based on a review of reverse engineering methods are proposed. 2. On the basis on theoretical studies, the main design and technological parameters are speci fi ed and the hyperbolic dependence of the angular rate of the laser sensor movement on the scanning radius is established for the developed mechatronic pro fi lograph. For example, for a constant pitch of the trajectory along the Archimedes spiral of 2 mm, the value of the angular rate of the sensor should gradually decrease from the maximum value of 2 rad/s to the minimum value of 0.574 rad/s, i.e. by 3.484 times. 3. An express analysis of the surfaces of propellers of vehicles with rotary symmetry is made and dif- ferences in the shapes of the surfaces of the propeller blades are speci fi ed by the deviation values in the longitudinal and transverse directions for different radii. Based on experimental data, a two-factor power model describing deviations with a determination coef fi cient of 0.967 is obtained, according to its analysis, it is clear that, on average, the angle of deviation in the perpendicular direction to the radius δ increases from 0 to 0.3  , and the angle of deviation along the radius γ increases from 0 to 5.4  . а b Fig. 5. Determination of deviation values: а –  ; b –  References 1. Ke Y., Fan S., ZhuW., Li A., Liu F., Shi X. Feature-based reverse modeling strategies. Computer-Aided Design , 2006, vol. 38, iss. 5, pp. 485–506. DOI: 10.1016/j.cad.2005.12.002. 2. Jeyapoovan T., Murugan M. Surface roughness classi fi cation using image processing. Measurement , 2013, vol. 46 (7), pp. 2065–2072. DOI: 10.1016/j.measurement.2013.03.014. 3. Lushnikov N., Lushnikov P. Methods of assessment of accuracy of road surface roughness measurement with pro fi lometer. Transportation Research Procedia , 2017, vol. 20, pp. 425–429. DOI: 10.1016/j.trpro.2017.01.069. 4. Alexander V.V., Deng H., Islam M.N., Terry F.L. Non-contact surface roughness measurement of crankshaft journals using a super-continuum laser. Conference on Lasers and Electro-Optics 2010 , San Jose, CA, 2010, p. AFA3. DOI: 10.1364/CLEO_APPS.2010.AFA3. 5. Rao C.B., Raj B. Study of engineering surfaces using laser-scattering techniques. Sadhana , 2003, vol. 28, pt. 3–4, pp. 739–761. DOI: 10.1007/BF02706457. 6. Abidin F.Z., Hung J., Zahid M.N. Portable non-contact surface roughness measuring device. IOP Conference Series: Materials Science and Engineering , 2019, vol. 469, p. 012074. DOI: 10.1088/1757-899X/469/1/012074.