132 results about "Drop test" patented technology

A drop test device for a movable impact platform can be used in the fields of spin-up drop tests of an aircraft landing gear, rolling property tests, tire static property tests and tire dynamic property tests. The drop test device for the movable impact platform comprises a portal frame, a ground fixing mechanism, a retraction jack, a hanging basket, a landing gear, a hanging basket guide mechanism, a clearance regulation mechanism, a movable impact platform, a hydraulic driving system and a ground guide mechanism. The movable impact platform of the invention consists of a truss-frame structure and high-speed guide rails, wherein the high-speed guide rails are connected with the truss-frame structure by blots through guide rail mounting holes. The hydraulic driving system is a high-speed servo proportional hydraulic system and is fixed on the ground through the ground fixing mechanism. The ground guide mechanism is two rows of guide sliding blocks which pass through the portal frame and are arranged parallelly. The movable impact platform is connected with the hydraulic driving system and is placed on the ground guide mechanism. The drop test device for the movable impact platform provided by the invention has the advantages of compact and simple structure and high strength and rigidity.

Drop test apparatus, for performing a drop impact test by dropping an article to be tested on a landing surface in a free fall state and by colliding the article with the landing surface, is equipped with a holder for holding the article and an acceleration means for accelerating the holder. The holder with the article is accelerated in the dropping direction of the article by the acceleration means, and the article is released from the holder at the point when the holder is accelerated to a predetermined speed and is dropped to the landing surface. The reproducibility of the test can be enhanced due to an elimination of an unstable factor such as frictional resistance when the holder is dropped, and a higher test in a dropping height without scaling-up the apparatus can be achieved.

The invention provides a drop test table, and belongs to the technical field of shock test equipment. The drop test table is composed of a supporting system, a lifting drop system and a secondary-shock-preventing drop system. The supporting system comprises guide rails (1) and a shock pad (2). The four guide rails (1), an upper drop table surface (21) and a lower drop table surface (22) form a cube to support the whole test table and guarantee the stability and guidance performance. The shock pad (2) is arranged on the bottom of the test table. The lifting drop system comprises a rigid base (3) and a collision plane (4). The top end of the rigid base (3) is of a half-round shape. The collision plane (4) is fixed below a drop table surface (18). The drop test table is good in stability and repeatability. Different shock accelerated speeds can be obtained by adjusting the elevation height of the drop table surface, the test requirements under different conditions can be met, secondary shock is avoided, operation is simple, and a man-made influence factor is small.

The invention relates to an aircraft simulating device, in particular to an aircraft landing gear drop test lifting force simulating device. In the invention, a damping piston is arranged in a damping sleeve, the damping sleeve is arranged in an actuator cylinder, and the actuator cylinder is externally connected with a power accumulator; and the power accumulator is aerated through an air pump and provides lifting power for the actuator cylinder to simulate lifting force. In the invention, the piston rod of the lifting force simulating actuator cylinder is made of an aluminum alloy material and has the advantages of compact structure, light weight and high strength; the structure of the lifting force simulating system is reliable in a running process, which effectively simulates the lifting force; and the device has the advantages of simple and reliable structure, easy processing and low economic cost and is easy to meet the requirement on strength and fatigue.

The invention relates to a system for testing vibration attenuation of a suspension of a rail vehicle, and belongs to parameter detection equipment of a rail vehicle. The system is designed to meet the requirement for detection of vibration attenuation characteristics of a rail vehicle. The system consists of mobile quick-falling release lifting devices, a China railways high-speed (CRH) bullet train, a falling test ground and rail device and a test system. The mobile quick-falling release lifting device comprises a falling arm assembly, a jack , a manual oil pump and a mobile vehicle; the CRH bullet train comprises a CRH bullet train body, a windshield and a bogie assembly; the falling test ground and rail device mainly comprises a falling test ground and a falling test rail; and the test system comprises a displacement detection system and an acceleration detection system, wherein the displacement detection system consists of a drawing wire encoder, a magnetic stand and a magnetic stand fixed steel plate, and the acceleration detection system consists of an acceleration sensor.

The invention relates to a drop test device and belongs to the technical field of the technological equipment. The drop test device is mainly characterized by comprising a base, a fastening bolt, a contact plate mechanism, a support, a reinforcing cross beam, guide rails, a top beam, a lifting hook, a pulley, a clamp, a limiting plate, a ladder, a bottom beam, a nylon rope and a winch; the contact plate mechanism comprises a pin seat, a shaft pin, a contact plate seat, a base, a groove, a contact plate and a supporting rod; the winch is used for controlling different heights, the contact plate mechanism is used for controlling different dropping angles, and the guide rails and the limiting plate are used for guaranteeing a vertical drop trajectory; the pulley is located in the same vertical plane with the two guide rails. The drop test device is good in test result consistency, wide in application range, safe for people to operate, quick and simple in retesting, convenient to adjust and maintain, and the like.

The invention discloses a three-point bending drop collision test method and device for equivalently simplifying beam and belongs to the collision test field. The three-point bending drop collision test method includes that selecting different types of alternative materials of a post B in a side collision finite element model of an automobile; analyzing and calculating the side collision finite element model under an initial collision speed to obtain collision energy absorbed by each kind of alternative material; calculating the average value of the collision energy absorbed by all the alternative materials; obtaining the average energy absorption level of the post B when using different types of materials; reversely calculating equivalent drop weight according to an energy equivalence formula; using the section size of the middle of the post B as the section size of the equivalent beam, building a geometrical model and a finite element model corresponding to the drop test according to the equivalent drop weight, and confirming test piece restraining ways after performing simulation calculation so as to enable the maximum displacement thereof to get as close as possible to the intrusion amount of the post B in the side collision; reasonably selecting materials of the post B so as to enable the post B to be more effectively used for the side collision safety design for the automobile.

The invention discloses a drop test load measurement method and device for an unmanned helicopter with a skid-type undercarriage. The device comprises a load measurement system, an unmanned helicoptersimulation test piece, a ground supporting system and a hoisting control system, the hoisting control system is arranged on the ground supporting system and is used for hoisting the unmanned helicopter simulation test piece, completing double-skid landing and/or forward flying or side flying landing with speed of the unmanned helicopter simulation test piece and controlling the falling height ofthe unmanned helicopter simulation test piece; the load measurement system is arranged on a supporting platform of the ground supporting system and used for collecting impact load and acceleration when the unmanned helicopter simulation test piece lands. According to the method, the dynamic response of the unmanned helicopter drop test load sensor and the acceleration sensor is acquired by using the dynamic acquisition system, the equivalent ground impact load is acquired, and the problem that the feedback load cannot be accurately identified and measured when the unmanned helicopter undercarriage falls onto the ground is solved.

The invention discloses a drop test dual-four-degree-of-freedom half vehicle model-based vehicle parameter identification method, which comprises the following steps of: setting at least six measurement points on a vehicle; obtaining an acceleration signal of each measurement point by using a plurality of drop tests; identifying modal parameters of the vehicle by using a state variable time-domain identification method and the obtained acceleration signals; identifying physical parameters, wherein the physical parameters comprise a mass parameter, a stiffness parameter, a damping parameter and a dimension parameter; correcting the parameters; and if correction errors are greater than standards, starting re-identifying the physical parameters from the step 4, and if the errors are less than or equal to the standards, finishing parameter identification. In such a way, a test method is simple, special requirements on test equipment are avoided, the estimated physical parameters are accurate, and simulation responses given by the estimated physical parameters are matched with responses obtained by the tests.

The invention discloses an inverted cup-type cradle for use in a drop test of a landing chassis, which is an important component for use in the simulation of the normal weight of an aircraft and the loading of the landing chassis of a landing chassis drop test bed and for forming a drop system with the landing chassis drop test bed. The cradle comprises a box body, a cradle top plate and a guide device using the inverted cup-type cradle to do linear motion vertical to the ground, wherein the guide device is fixed on two opposite sides of the box body; and the lower surface of the cradle top plate is provided with a fixing device for mounting the landing chassis to form a inverted cup-type structure, and the inside of the inverted cup-type structure is provided with a rigidity adjusting device. Compared with the conventional cradle, the inverted cup-type cradle has the advantages of saving the space and height and construction cost of the drop test bed, along with adjustable multidirectional rigidity, short power transmission route, large rigidity, and capacity for simulating the normal weight of a miniature aircraft.

The invention belongs to the field of aerospace dynamics tests and relates to a five-degree-of-freedom full-aircraft drop test aircraft posture follow-up control device. The follow-up control device comprises pulleys, four force bearing uprights, tension ropes, sliding barrels and upright supports, the force bearing uprights are symmetrically arranged on two sides of a test aircraft in a front row and a rear row and fixed by the upright support, the pulleys are arranged at the tops of the force bearing uprights and the ground among the force bearing uprights, a movable sliding barrel is arranged in the middle of each force bearing upright, wings of the test aircraft are connected with the sliding barrels by the tension ropes through the pulleys on the ground and at the top ends of the force bearing uprights, and an undercarriage is directly connected with the sliding barrels on the force bearing uprights through the tension ropes horizontally. The five-degree-of-freedom full-aircraft drop test aircraft posture follow-up control device has the advantages of simple structure, high reliability, capability of realizing automatic tracking, easiness in adjusting and low manufacturing cost.

The invention relates to the technical field of shipboard aircraft undercarriages, and particularly relates to a shipboard aircraft undercarriage test device and a test method. The shipboard aircraft undercarriage test device comprises a sliding locating module, an undercarriage module, an acceleration module, a deck module and a dynamometer module, and is characterized in that the sliding locating module comprises a horizontal sliding rail and a positioning rope, the undercarriage module comprises a counterweight, an undercarriage elastic support and an undercarriage model, the acceleration module comprises an oblique plate acceleration device, a spring acceleration device and an oblique plate guide rail, the deck assembly comprises a stiffened plate rack and an elastic support, and the dynamometer module comprises a dynamometer. According to the test device and the test method provided by the invention, the elasticity of a deck, influences of water and swaying of a chip involved in the drop process of the chipboard aircraft undercarriage are simulated, and drop tests with a horizontal speed and a vertical speed of the undercarriage can be simulated, so that a load stroke curve of the undercarriage is acquired, and the curve is regarded as a general reference curve of the undercarriage in various conditions.

The invention discloses a full-aircraft drop test device and a full-aircraft drop test method and relates to the technical field of aircraft drop test. The full-aircraft drop test device comprises a support structure which is used for supporting a full-aircraft test model; an elevating system which is fixed on the support structure and is connected with the full-aircraft test model and is used for lifting or dropping the full-aircraft test model; a force measurement platform which is fixed on a test ground and is arranged in accordance with a landing gear of the full-aircraft test model and is used for supporting the dropped full-aircraft test model. According to the full-aircraft drop test method, the drop test of a full-aircraft test model is completed by means of the above full-aircraft drop test device. The invention is advantageous in that the invention can quickly adjust the attitude of the full-aircraft test model, has simple structure and low manufacturing cost, and can be applied to different types of full-aircraft test models.

The invention discloses a parafoil control law test commissioning platform and a commissioning method. The commissioning platform comprises a ground device and an air device, wherein the ground device comprises a ground commissioning station and a ground commissioning radio station; the air device comprises a control center, and an air commissioning station and a driving structure in communication connection with the control center; the air commissioning station and the ground commissioning platform are in two-way wireless communication; the air device also comprises a left-right servo mechanism; the left-right servo mechanism is connected with the driving mechanism and folding and unfolding of a left-right operation rope of the parafoil can be controlled under driving of the driving structure. Real-time commissioning can be realized; the commissioning effects can be observed in real time through trajectory of the parafoil; characteristics of real-time performance, high efficiency, intuitiveness, and reliable work can be realized; manual interference can be realized; practicality is strong; the number of air drop tests can be reduced, risks of air drop can be reduced, and the efficiency is improved.

The invention discloses a drop test device and a drop test method of a lander landing gear. The device comprises a lifting system, a drop system, a load collection system and a rack system, the lifting system is fixed to the rack system, the drop system is arranged on the rack system and can vertically slide, and the load collection system is arranged below the drop system; the landing postures of landing support legs in the drop system are adjusted, the landing postures are fixed, the drop system is lift to a predetermined height, the drop system freely slides along a sliding strut under the action of gravity, foot pads on the landing support legs are in contact with a six-dimensional force measurement platform to simulate the collision process of the lander and the ground, and data are recorded. The drop test device disclosed by the invention has the advantages of simple structure, smaller structure weight and high test measurement accuracy.

The invention discloses a drop test device. The drop test device comprises: a base; an initial positioning device which is installed on the base, wherein the initial positioning device comprises an initial positioning piece used for initially positioning a piece to be measured, the initial positioning piece is movably arranged relative to the base, and the initial positioning piece is provided with an initial positioning position and an avoiding position far away from the initial positioning position; and a height adjusting device installed on the base, wherein the height adjusting device is used for moving a to-be-measured piece on the initial positioning piece located at the initial positioning position to a preset falling position, the preset falling position is located above the initial positioning position, and the height adjusting device is also used for enabling the to-be-tested piece to fall at the preset falling position. Therefore, the mechanization degree and the automationdegree of the drop test can be improved, so that the precision, the consistency and the test efficiency of the drop test can be improved.

The invention belongs to the field of undercarriage drop tests and relates to a method for a drop test for verifying the buffer performance of an undercarriage of a movable platform. The method is characterized in that the requirement for drop test design of the undercarriage of the movable platform is stipulated. The method has the advantages that when the method is used for designing the undercarriage drop test, the buffer performance of the undercarriage of the movable platform can be correctly and fully verified and a conclusion showing whether the buffer performance of the undercarriage is qualified or not is given; the method is applied to design of the undercarriage drop test of one movable platform and the effectiveness of the method is verified by the undercarriage drop test and a flight test.

The invention provides drop test equipment and a drop test method. The drop test equipment comprises a drag module, a release module and an adsorption module, and further comprises a sensor module connected with the release module, wherein the sensor module is used for detecting a free-fall motion of the release module, and a control module connected with the adsorption module and the sensor module; and the control module is used for triggering the adsorption module to perform air suction interruption control when the sensor module detects the free-fall motion and the free-fall motion satisfies a preset condition. According to the drop test equipment, due to the setting of the preset condition, when the free-fall motion of the release module satisfies the preset condition, the adsorption module is triggered to perform the air suction interruption control to perform drop detection on a sample terminal, so that the drop test randomness can be effectively reduced, and the drop test resultis enhanced.