Dalian University of Technology

Xin Liu

Qingchao Sun

Yunlong Wang

Yichao Gao

Jinlong Song

Liu Huang

Hong Zhang

Wei Sun

Yuwen Sun

Deyue Zou

Xuyue Wang

Nan Zhao

Rui Yang

Yunfeng Liu

Changlin Zhao

Mingqian Gao

Jianwei Liu

Jue Wang

Yingjie Jiang

Wentao Zhang

Jiaqi Suo

Dali Chai

Lan Ding

A superhydrophobic hemispherical array which can realize droplet pancake bouncing phenomenon is provided. The superhydrophobic hemispherical array shows an arc-shape structure which is narrow at the top and wide at the bottom, where a is the angle that substrate-gas interface goes across the gas and reaches substrate-hemisphere interface, d refers to the diameter of the contact area between hemispherical structure and substrate, s represents the space between two adjoining hemispheres, h denotes the vertical height from the top of hemisphere to substrate surface, and 70&#xb0;&#x2264;a&#x2264;90&#xb0;, 900 &#x3bc;m&#x2264;d &#x2264;1700 &#x3bc;m, s&#x2264;550 &#x3bc;m, 600 &#x3bc;m&#x2264;h&#x2264;1100 &#x3bc;m, respectively. The superhydrophobic hemispherical array has a water contact angle larger than 150&#xb0; and roll-off angle lower than 10&#xb0;.

Superhydrophobic hemispherical array which can realize droplet pancake bouncing phenomenon

It is a teaching system for remote hydraulic experiments based on combination of virtual and real, belonging to the field of teaching application. In the virtual simulation teaching system for remote hydraulic experiments based on combination of virtual and real, the virtual and real combination part involves that a hydraulic circuit is simulated by a student by remotely calling the Automation Studio software on the experimental platform, the hydraulic circuit is modified and optimized according to the idea of the student, and the hydraulic experimental platform is connected finally to perform actual operations. The system is also added with a network HD ball machine, a network video recorder, a switch, a ball machine bracket, a router and other devices to form a feedback system, so the student can observe the real-time operation of the hydraulic experimental platform through the feedback system.

Teaching system for remote hydraulic experiments based on combination of virtual and real

A method for calculating eccentricity of rotor assembly axis based on radial runout measurement comprises matrix characterization of data and calculation of relative runout value at each point, establishment of a spring equivalent model and calculation of contact force, eccentric direction and magnitude; calculation of relative runout value; establishment of a spring equivalent model to analyze the relationship between force and displacement in each phase of a contact process, and then an uneven contact force at each point is obtained; and determination of eccentricity is to determine the magnitude of eccentricity. Based on the measured radial runout data in production practice, this method realizes the prediction of eccentricity of axis before assembly, improves the coaxiality of rotors after assembly, and has important practical guiding significance for axis prediction as well as assembly phase adjustment and optimization in the assembly process of aero-engine rotor pieces.

Method for calculating eccentricity of rotor assembly axis based on radial runout measurement

A method for judging rotating characteristics of light sources based on summation calculation in visible light indoor positioning is disclosed. The method is implemented based on an LED positioning system, and comprises the following steps: firstly, arranging the light sources into a convex pattern in order, and arranging the emitted sequence for each light source according to set conditions; secondly, fixing the position and attitude of a cell phone as a receiving end, continuously shooting with the cell phone camera to obtain a set of light source pictures, and performing image processing to obtain emitted sequences of the light sources; thirdly, performing sequence correlation operation on adjacent light sources to obtain emitted sequence delays, and performing summation calculation on the emitted sequence delays, to judge true and false light sources; and finally, excluding the false light source, and then completing positioning using a positioning algorithm.

Method for judging rotating characteristics of light sources based on summation calculation in visible light indoor positioning

A thermal extrusion method to fabricate large-dimension superhydrophobic cylinder pillar arrays with droplet pancake bouncing phenomenon. Preparing thermal extrusion mold: the through-hole arrays with 0.8&#x2dc;1.25 mm diameter, 0.25 mm interval space and 0.6&#x2dc;1.0 mm height are first obtained on metals, and are then polished, rinsed and dried. Thermal extrusion: polymer materials are first thermally extruded on the obtained mold and cooled to room temperature. Demold: excess polymer materials flowing from the through hole are cut off and then the polymer cylinder pillar arrays are lifted off from the mold. Superhydrophobic treatment: the whole polymer sample is treated using mixed liquid spray consisting of titanium oxide nanoparticles dispersed in fluoroalkylsilane ethanol solution, and the superhydrophobic cylinder pillar arrays are obtained. The method is easy to operate, low-cost, recyclable, effective for different polymer materials, and can obtain cylinder pillar arrays with large dimensions, which can realize efficient large-area and industrial fabrication of the droplet pancake bouncing surfaces.

Thermal extrusion method to fabricate large-dimension superhydrophobic cylinder pillar arrays with droplet pancake bouncing phenomenon

A method for calculating axis deviation of rotor assembly based on end face runout measurement comprises three parts: calculation of three contact points, a triangle judgment criterion and a homogeneous coordinate transformation algorithm of a deviation matrix. Based on the measured end face runout data in production practice, the method realizes the prediction of axis deviation before assembly, improves the concentricity of rotors after assembly, also greatly increases the one-time acceptance rate of assembly and has important practical guiding significance for axis prediction as well as assembly phase adjustment and optimization in the assembly process of aero-engine rotor pieces.

Method for calculating axis deviation of rotor assembly based on end face runout measurement

Disclosed is a system for shape error in-situ measurement of large-scale torus, which comprises an attitude adjusting part, a rotating part and a measuring part. The attitude adjusting part comprises an attitude adjusting platform, an attitude adjusting platform motor and an adapter panel, wherein the attitude adjusting platform can adjust the rotation angles along z-axis and x-axis, the angle adjusted is controlled by the attitude adjusting platform motor, and the attitude adjusting part is connected with the rotating part through the adapter panel; the rotating part comprises a rotating index plate base and a high-precision rotating index plate which is released from fixation by a lever for rotating, rotated manually for a required angle, and then fixed again by restoring the lever; the measuring part comprises a sensor clamp, sensor holders, contact sensors and associated equipment, wherein the sensor clamp is positioned with the rotating index plate by a mandrel and then fixed by two bolts and nuts; and the sensor clamp has four groups of sensor jacks in total, with at least three jacks in each group, and a sensor holder is installed in each sensor jack and used for fixing each sensor.

System for shape error in-situ measurement of large-scale torus

Growing community of inventors

Dalian, China

Xin Liu