Ren H.,University of Jinan |
Zhang L.,China National Heavy Duty Truck Group Co. |
Tang C.,Tianjin University
Chinese Control Conference, CCC | Year: 2015
Denoising is the key problem in electronic speckle pattern interferometry (ESPI). In order to eliminate noise, to enhance the qualities of fringe patterns, we proposed a new filtering method which is based on curvelet transform for ESPIAnd its application to electronic speckle fringe filtering. Firstly, fringe pattern is performed on by curvelet transform;Secondly, the method which is combined with soft and hard threshold is applied to remove coefficient of noise;so as to separate signal from noise, threshold process is conducted by curvelet coefficient of square. Finally, the filtered image is obtained by reconstruction of coefficient of curvelet transform. This new method has applied on one computer-simulated fringe pattern and one experimentally obtained pattern of the filter, and compare to wavelet filtering and windowed Fourier filtering whose models are extensive used. The index that filtered results is evaluated with mean square error (MSE). Experimental results demonstrate that the method for filtering in ESPI has the advantages of high precision, fast filtering speed, simplicity in implement, and suitable for measurement of real time. © 2015 Technical Committee on Control Theory, Chinese Association of Automation. Source
Liu X.,Heilongjiang Institute of Science and Technology |
Liu J.,China National Heavy Duty Truck Group Co.
Advanced Materials Research | Year: 2012
Research on spindle system of a machine tool, using Solidworks software to establish the spindle assembly model, using ANSYS finite element analysis method to analyze the dynamic rigidities of spindle systematacially. Compare dynamic rigidities of test with the motorized spindle were analyzed. Validate dynamic rigidities of the spindle accord with dynamic characteristic. © (2012) Trans Tech Publications. Source
China National Heavy Duty Truck Group Co. | Date: 2012-01-17
land vehicles; automobiles; carts; buses; trucks; coaches; recreational vehicles, namely, campers; wagons and motor cycles.
China National Heavy Duty Truck Group Co. | Date: 2011-12-20
Land vehicles, namely, automobiles, cars, lorries, wagons, and military vehicles for transport, namely, land vehicles; engines for land vehicles; transmission mechanisms, for land vehicles; automobile chassis; automobile spare wheel holders; tires for land vehicles.
China National Heavy Duty Truck Group Co. | Date: 2012-06-26
Starters for motors and engines; diesel-operated machines other than for land vehicles, namely, diesel-operated water pumps for use in motors and engines; gasoline-powered machines other than for land vehicles, namely, electricity generators; glow plugs for vehicle engines; control mechanisms for machines, engines or motors, namely, pneumatic and hydraulic controls; pistons for vehicle engines; engine oil filters; intake air filters for automobile engines; pumps as parts of machines, engines or motors; speed governors for machines, engines and motors. Providing information relating to repair in the automobile sector; machinery installation, maintenance and repair; motor vehicle maintenance and repair: vehicle services station services featuring refueling and maintenance services; vehicle wash; spraying and coating services, namely, application of coating and sealers; retreading of tires; leather care, cleaning and repair; vulcanization of automobile tires; disinfecting services, namely, heat based disinfecting services, namely, killing of organisms and removal of toxins in enclosed environments, drying, disinfection, reduction of asthma triggers, baking out odors, destroying viruses and bacteria.