The invention discloses a novel water surface aircraft water load testing device. The novel water surface aircraft water load testing device comprises a water surface aircraft water load testing device body, wherein the water surface aircraft water load testing device body comprises a supporting connection beam (3), a front and rear supporting connection assembly, a lifting mechanism, a left and right supporting connection assembly and a group of linear bearing guide mechanisms; the supporting connection beam (3) is arranged in the middle of two box girders of a central testing bridge (1); and the front and rear supporting connection assembly is composed of a front supporting connection rod (30), a front supporting base (4), a front supporting threaded handle (3), a rear supporting connection rod (6) and a rear supporting threaded handle (7). According to the novel water surface aircraft water load testing device, lifting systems are capable of dual lifting, and are simple in installation and disassembly; the novel water surface aircraft water load testing device can realize 6 degree-of-freedom non-interference water touching and sliding, and is capable of more realistic simulation; linear bearings are adopted for vertical guidance, thereby improving the precision of vertical guidance; and the pitching and rolling gestures of a test piece are simple to adjust, and the test piece is easy to operate.

Novel water surface aircraft water load testing device

Multipurpose Towing Carridge with which Resistance and Propulsion Test and Maneuverability Test can be performed

The invention discloses a ship model pitching, heaving and coupling motion remote test system. The system comprises a pool and a ship model positioned in the pool. A load iron block is installed at the center of gravity of the ship model, laser rangefinders are installed on the both sides of the load iron block, the laser rangefinders are connected with a data transmission station transmitting terminal, the data transmission station transmitting terminal is connected with a data transmission station receiving terminal through signals, the data transmission station receiving terminal is connected with a computer, the computer is connected with a client through a remote control module, a camera is arranged above the laser rangefinders, and the camera is connected with the data transmission station transmitting terminal through signals. According to the ship model pitching, heaving and coupling motion remote test system and a test method, the trim angle and heaving distance of a ship are measured by the devices of the laser rangefinders, the laser wavelength is short, the measurement error is very small, the influence from the surrounding environment is avoided, and the defect that greater errors are produced due to the fact that the traditional tilt angle sensors are easily affected by the surrounding environment is overcome.

Ship model pitching, heaving and coupling motion remote test system and test method

A flap type wave generator system in a high-gravity field comprises a centrifugal machine system, a motor, a belt, a speed changer, a force conversion device, a flap device and a wave eliminating device, wherein a model box is arranged in a hanging basket of the centrifugal machine system, the wave generator system is arranged on the model box, the force conversion system is fixed on the upper surface of a top cover of the model box, the axial direction of the motor, the axial direction of a transmission shaft and the axial direction of the speed changer are perpendicular to the top cover of the model box, and the motor, the transmission shaft and the speed changer are arranged in parallel; the output of the motor passes through the transmission shaft and then is output by the speed changer through speed change to the input end of the force conversion device, the force conversion device converts the rotating motion output by the motor into the linear reciprocating motion which is then output to the second end of a flap, the flap device comprises the flap, a fixing plate and a support, the support is fixed on a base plate of the model box, the first end of the flap is connected with the fixing plate in a rotary mode, and the second end of the flap is connected with the output end of the force conversion device in a rotary mode. The mechanical driving flap type wave generator has the advantages of being high in control precision and good in wave generation frequency characteristic.

Flap type wave generator system in high-gravity field

The invention discloses a physical model of a mooring ship and a test method of the physical model. The physical model of the mooring ship comprises a harbor basin, a wave generator, wave damping gentle slopes, an underground reservoir, a harbor model, a ship model, one or more submersible pumps, a guide wall, wind stands, cable models and a six-movement-quantity measuring apparatus, wherein the wave damping gentle slopes are arranged around the harbor basin; the underground reservoir is arranged under the ground of the harbor basin; the wave generator is arranged at one end of the harbor basin, and the harbor model and the ship model are arranged at the other end of the harbor basin; the guide wall is arranged at the periphery of the harbor model and the ship model; the wind stands are arranged on the ship model; the harbor model comprises dolphin piers, cable mooring piers, ship fender sensors, an iron stand and a computer; one ends of the cable models are connected with the harbor model, the other ends of the cable models are connected with the ship model, and a cable force sensor is arranged at the connecting end of the cable models and the ship model; the ship model is provided with a probe and the six-movement-quantity measuring apparatus; the cable force sensor, the ship fender sensors and the six-movement-quantity measuring apparatus are respectively connected with the computer. The physical model of the mooring ship disclosed by the invention can simulate the working conditions of combinations of various stormy waves and flows.

Physical model of mooring ship and test method of physical model

The purpose of the present invention is to provide a device which can, with respect to performance evaluation of a ship in waves by means of a model test, reduce the component of primary wave power in the total resistance in waves and measure the total resistance in waves by means of a dynamometer that has appropriate capacity, and thus can consequently have improved measurement accuracy of additional resistance in waves. In order to attain the purpose, the present invention provides a device for measuring added resistance in waves, the device comprising: a moving unit which is disposed on a towing carriage, is connected to a model ship by means of a connecting rod, and moves forward and backward according to the forward and backward oscillation of the model ship; a restraining unit which is provided on the moving unit and partially restrains the movement of the moving unit; and a dynamometer which is provided on the connecting rod and measures the total resistance in waves applied to the model ship.

Device for measuring added resistance in waves

The present invention relates to a method for setting a draught condition of a model ship by using an automatic model ship draught control device including a draught measuring device, a wireless transmitting and receiving device, and a gravity center shifting device which are provided on the inside of the model ship, and a wireless control device which is provided on the outside of the model ship to carry out wireless communications with the wireless transmitting and receiving device The present invention provides a method for setting a draught condition of a model ship through the automatic reciprocating motion of a weight, comprising: a step where the draught measuring device measures the draught of the model ship and transmits the measured draught value to the wireless transmitting and receiving device; a step where the wireless transmitting and receiving device transmits the measured draught value of the draught measuring device to the wireless control device; a step where the wireless control device generates a gravity center shifting command if the measured draught value of the draught measuring device is different from a pre-calculated set draught value; a step where the wireless transmitting and receiving device receives the gravity center shifting command of the wireless control device and transmits the same to the gravity center shifting device; and a step where the gravity center shifting device automatically shifts the gravity center position of the model ship through the linear reciprocating motion of the weight

Device for automatic draught setting of model ship

The purpose of the present invention is to provide a device which can enable quick and accurate setting of a draft condition of a model ship by means of an automated system without manually changing the position of a weight during a model test. In order to attain the purpose, the present invention provides an automatic draft adjustment device for a model ship, the automatic draft adjustment device comprising: a draft measurement apparatus which is provided on a model ship, measures the draft of the model ship, and transmits a measured draft value to a wireless transmission and reception apparatus; the wireless transmission and reception apparatus which is provided on the model ship, communicates wirelessly with a wireless adjustment apparatus, transmits the measured draft value from the draft measurement apparatus to the wireless adjustment apparatus, receives a gravity center changing command from the wireless adjustment apparatus, and transmits same to a gravity center changing apparatus; the wireless adjustment apparatus which is provided on the outside of the model ship and, if the measured draft value from the draft measurement apparatus is different from a pre-calculated set draft value, generates a gravity center changing command; and the gravity center changing apparatus which is provided on the model ship and, if the wireless adjustment apparatus generates the gravity center changing command, automatically changes the position of the gravity center of the model ship by means of the linear reciprocating motion of a weight.

Automatic draft adjustment device for model ship

The side-type device for the wave absorber in the towing tank

The present invention has an objective to provide a method for accurately obtaining wake information at a predetermined phase angle of a rotating propeller by synchronizing the measurement frequency of a particle image velocimetry and the rotation frequency of the propeller and obtaining a maximum amount of the wake information in a limited time period. In order to achieve the objective, the present invention provides a method for efficiently measuring propeller wake by using a particle image velocimetry including a laser device and a camera, comprising: a step in which an encoder measures a propeller angle so as to transmit the same to a pulse controller; a step in which the pulse controller generates a trigger signal so as to transmit the same to a synchronization device when the propeller reaches a predetermined phase angle; a step in which the synchronization device receives the trigger signal of the pulse controller and operates the laser device so as to synchronize the pulse controller and the laser device; a step in which the laser device irradiates laser to propeller wake at a measurement frequency of predetermined intensity according to the operation signal of the synchronization device; and a step in which the camera photographs the propeller wake to which the laser is irradiated.

Lee Chang Yong

Papers

Device for measuring added resistance in waves

Device for automatic draught setting of model ship

Automatic draft adjustment device for model ship

The side-type device for the wave absorber in the towing tank

Method for measuring propeller wake at specific angular position using piv in towing tank