Hwang Min Oh

Bio: Hwang Min Oh is an academic researcher. The author has contributed to research in topics: Pile & Snow. The author has an hindex of 2, co-authored 4 publications receiving 9 citations.

Jacket structure with enhanced pullout resistance

Abstract: The present invention provides a jacket structure with enhanced pull-out resistance, which has a plate-shaped precast reinforced concrete structure, comprising: a jacket unit, which supports an offshore wind structure; a pile unit, which is coupled with the lower part of the jacket unit and supports the jacket unit while being embedded into the ocean floor; and a connection member, which is coupled with the lower part of the jacket unit and makes all of multiple piles, which are equipped in the pile unit, move. The pile unit comprises a central pile, which is arranged at the center of the lower part of the jacket unit and uniformly supports any pull-out load applied from the front; and multiple outer piles, which are arranged on the outer area of the jacket unit and support the central pile. The outer piles are shorter than the central pile and are embedded at a shallow depth, considering the maximum compressive load applied to the pile unit, and have smaller diameter than the central pile. The connection member includes a central mounting hole where the central pile is installed; and an outer mounting hole where the outer piles are installed. According to the present invention, the jacket structure is available in an area where water is deep and can effectively support the pull-out load applied to the lower part of the offshore wind structure from the front.

Wind turbine tower

Abstract: PURPOSE: A wind power turbine tower is provided to control the vibration characteristics of a wind power turbine tower by a movable mass, to control the vibration characteristics of a wind power turbine tower to have the required vibration characteristics regardless of mechanism or a structure or the rotational speed of a blade in a wind power turbine tower, to reduce the cost of planning, manufacture and construction of a wind power turbine tower, and to correspond appropriately by controlling vibration characteristics under unexpected circumferences. CONSTITUTION: A wind power turbine tower(100) comprises a tower type structure(200) installed to a power generation site using wind power, a power generation unit(300) provided to the top of the tower type structure, a blade unit(400) connected to the power generation unit and composed of plural blades(410), and a vibration characteristics control unit(500) including a mass(M) provided to the inside or the outside of the tower type structure to be movable and moving the mass to control the vibration characteristics of the whole wind power turbine tower.

Device for removing snow and ice on roadway

Abstract: PURPOSE: A device for removing snow from a road and preventing the road from freezing is provided to easily remove snow and ice from a road using energy produced from traveling wind. CONSTITUTION: A device for removing snow from a road and preventing the road from freezing comprises a heating unit (10) and a wind power generator (20). The heating unit has heating wires (12). The heating wires are installed on the inner side of a road (100) and generate heat. The wind power generator is installed on a road side and produces electric energy from traveling wind to supply the electric energy to the heating unit.

Method of damping wind turbine tower oscillations

Abstract: A method of damping oscillations in a wind turbine tower comprises connecting a bag of material or liquid to a tower component at a first lateral distance away from a tower wall. The bag is also suspended from the tower component by a first vertical distance. The height of the tower component is known such that the first vertical distance corresponds to a particular height within the tower. The first lateral distance, first vertical distance, and mass of the bag are such that the bag is configured to hit said tower wall during oscillations in said wind turbine tower, in order to damp said oscillations in said wind turbine tower.

Connecting apparatus of taped poles

Abstract: PURPOSE: A connecting device of a separate tapered pole is provided to couple with the upper part of the tapered pole and the lower supporter easily and rapidly even if a joint of the upper tapered pole and the lower supporter accurately does not accord. CONSTITUTION: A connecting device of a separate tapered pole comprises a pole connecting ring(43) coupled inside the bottom part of an upper tapered pole(10), a pole connector(40) coupled with the pole connecting ring, a setting ring plate(50), and a connector cover(60). The setting ring plate is coupled with the pole connector by a bolt(70), and joined inside the upper part of the bottom supporter. The connector cover covers to prevent exposure of the pole connector to the outside.

Length control is a possible street lamp pole

Abstract: A length-regulable streetlight pole is provided to light up the circumference of a streetlight pole with constant luminous intensity regardless of the height of an area where a streetlight pole is installed and to improve the appearance of the streets by keeping streetlight poles at the appointed height. A length-regulable streetlight pole lights up the circumference of a streetlight pole with constant luminous intensity regardless of the height of an area where a streetlight pole is installed by forming an upper pole(1) with two or more pipe bodies and connecting with supports(4), and forming a lower frame(10) of the upper pole to come in and out an upper frame(100), thereby varying the length of the upper pole in multi-stage.

Jacket support structure for offshore wind turbine using precast housing with tuned liquid damper and suction pile and the construction method

Abstract: The present invention relates to a jacket support structure which enables installation of an underwater wind power plant, and more specifically, to an offshore wind jacket support structure which uses a precast concrete (PC) house and a suction pile provided to be resistant to applied loads and buckling and to enable rapid construction, and a construction method thereof. The PC house is integrated with an upper part and a lower part of a leg to interpenetrate and install a jacket in the seabed through a suction work, thereby enabling rapid construction of a structurally stable offshore wind jacket support structure.

Apparatus for reducing tower vibration using fluid flow

Abstract: The present invention relates to a vibration reducing apparatus of an aerogenerator tower (10) which comprises: a chamber means having a plurality of divided water storage spaces on a wall of the tower (10); a fluid supply means (30) for accessing fluid in the water storage space of the chamber means (20), and inducing a change of a natural frequency of the tower (10); and a control means (50) for detecting a vibration status of the tower (10), and applying a set output to the fluid supply means (30). Therefore, the vibration due to resonance can be reduced by changing the natural frequency of the tower based on a fluid moving method to exclude an increase in the thickness of a material according to an enlargement trend in the aerogenerator.