132 results about "Drop test" patented technology

Embodiments of the present disclosure include disposable wearable absorbent articles with anchoring systems. In an embodiment, a disposable wearable absorbent article includes an absorbent core and an anchoring system configured to anchor the absorbent core to a wearer. The article is configured to experience an average sag of less than a particular distance after a certain number of drops in a mannequin drop test

This invention provides a multilayer printed wiring board in which electric connectivity and functionality are obtained by improving reliability and particularly, reliability to the drop test can be improved. No corrosion resistant layer is formed on a solder pad 60B on which a component is to be mounted so as to obtain flexibility. Thus, if an impact is received from outside when a related product is dropped, the impact can be buffered so as to protect any mounted component from being removed. On the other hand, land 60A in which the corrosion resistant layer is formed is unlikely to occur contact failure even if a carbon pillar constituting an operation key makes repeated contacts.

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.

The invention discloses a drop test machine which is used for testing impact-resisting performance of an article to be tested. The drop test machine comprises a ball falling device, a load-bearing assembly and an electric cabinet electrically connected to the ball dropping device and the load-bearing assembly. The load-bearing assembly is used for bearing the article to be tested. The ball falling device is used for allowing an impact ball with the certain weight to fall on the article to be tested and offering preset impact force to test points of the article to be tested. The electric cabinet controls the ball falling device to adjust the falling vertical height of the impact ball and controls the load-bearing assembly to adjust the horizontal position of the article to be tested. Therefore, the impact ball falls down and is aligned with various test points of the article to be tested in sequence so that an impact-resisting performance test can be carried out on the various test points in sequence.

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 discloses a crack initiation steel pipe for a full-scale gas bursting test of a large-diameter high-grade steel gas pipeline and a preparation method thereof, belonging to the field of a petroleum pipeline breakage control test. The steel pipe comprises the following components by weight percent: 0.07%-0.12% of C, 1.50%-1.75% of Mn, 0.15%-0.35% of Si, less than or equal to 0.015% of P, 0.010%-0.020% of S, 0.005%-0.030% of Al, less than or equal to 0.002% of O, less than or equal to 0.00015% of H, less than or equal to 0.005% of N and the balance of Fe; and carbon equivalent is less than or equal to 0.55%, and the cold cracking sensitive coefficient is less than or equal to 0.28%. The preparation method comprises the following steps: smelting and continuously casting the raw materials so as to form a thick slab; carrying out rough rolling and precise rolling so as to obtain a hot rolled steel plate; and forming the hot rolled steel plate, then welding, and then expanding diameter so as to prepare the steel pipe, wherein the yield strength of the steel pipe is 550MPa-840MPa, the tensile strength of the steel pipe is 625MPa-990MPa, the charpy impact toughness of the steel pipe at the temperature of 0 DEG C is controlled between 100J-200J, and the fracture shearing area in a drop test is larger than or equal to 85%. The prepared steel pipe is used as the crack initiation steel pipe for the full-scale gas bursting test; and after crack initiation is carried out, the fracture is of ductile fracture topography and has no obvious fracture separation.

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 provides a drop test device based on an e-commerce product packaging box, which belongs to the technical field of drop test devices, and aims to solve the problem that when a box body isfixed on a test piece fixing frame of an existing drop test device, the box body is fixed very strenuously due to the fact that the box body is fixed through a fixing support. The device comprises abottom plate, and a sliding support member is fixedly connected with the middle part of the rear side of the upper end face of the bottom plate. Aclamping mechanism drives two clamping discs to clampthe box body,then the box body is moved upwards to a required height through the lifting mechanism,an external controller is used for controlling a rotating shaft of the clamping motor to reversely rotate, the clamping screws are rotated in opposite directions, so that the two clamping plates move in opposite directions, the box body loses the clamping effect, then the drop test is carried out, the box body does not need to be carried manually when the box body is fixed, more labor is saved when the box body is fixed, and the practicability of the drop test device is further improved.

The invention relates to the technical field of simulation evaluation of an air drop technology, in particular to an analog calculating method for the landing buffering process of the equipment air drop. The analog calculating method comprises the following three implementing steps of: establishing a finite element model of an equipment-airbag system by a computer; carrying out analog calculation on the landing buffering process of the equipment air drop on the basis of a nonlinear finite element; and generating an analog result of the landing buffering process of the equipment air drop. The analog calculating method implements the simulation on the landing buffering process of the equipment air drop on the basis of a nonlinear finite element method and also acquires a simulation calculation method for the airbag buffering characteristic of the equipment-airbag system and the equipment impact response characteristic, provides an effective measure for the demonstration, design and development work of air drop equipment, and solves the problems of high risk, high cost and long period of the equipment air drop test.

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 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 embodiment of the invention discloses drop test equipment, method and device. The equipment comprises a drop compensation module and a drop mechanism, wherein the drop mechanism is used for driving a testing product to freely drop downward in a drop test process; the drop compensation module is arranged at the upper part of the drop mechanism and is used for applying a downward acting force tothe drop mechanism when the drop mechanism starts to freely drop, so as to carry out acceleration compensation on the drop mechanism. According to the embodiment of the invention, the downward actingforce can be applied to the drop mechanism in a drop test, so that the acceleration compensation is carried out on the drop mechanism and loss of an acceleration in the drop test process of the testing product is avoided; the accuracy of the drop test is effectively improved.

The invention provides a simple pendulum drop type test device, which is composed of a pendulum bob, a hexagon socket head cap screw, a supporting rod, a vertical board, a hexagon nut, a dragging nut, a connecting rod, a cross recessed pan head screw, a driving system, a deep groove ball bearing, a blocking rod, a pendulum distance adjusting hole, a firing pin rod, a firing pin head, a firing pin supporting seat and a drop subject model. The pendulum bob is connected with the supporting rod through the hexagon socket head cap screw, the supporting rod is connected with the vertical board through the hexagon nut, the driving system is connected with the connecting rod through the cross recessed pan head screw, the connecting rod is connected with the dragging nut and the deep groove ball bearing, the dragging nut is connected with the blocking rod, the firing pin supporting seat is connected with the firing pin rod, and the firing pin rod is connected with the firing pin head which is connected with the drop subject model. By means of the simple pendulum type drop test device, a drop test of workers and cargo models of a side cargo bay and a cargo bay door of the airplane model can be achieved, maintenance of the device is convenient, and dismounting is speedy. The test indicates that different initial velocities of drop object models can be obtained through the simple pendulum drop test device, and repeatability is good.

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 relates to an aircraft attitude control method for a full-aircraft drop test for a ship-borne early warning aircraft. A three-point type lifting method is adopted for lifting a front aircraft body lifting point of the ship-borne early warning aircraft and symmetrical lifting points on wings on the two sides, a first lifting rope is connected with the front aircraft body lifting point, and the two ends of a second lifting rope are connected with the measured symmetrical lifting points of the wings; the first lifting rope is used for adjusting a pitch attitude of the ship-borne early warning aircraft, and the second lifting rope is used for adjusting a rolling attitude of the ship-borne early warning aircraft; and both the first lifting rope and the second lifting rope avoid a radome at the top of the ship-borne early warning aircraft, and stretching of the first lifting rope and / or the second lifting rope is controlled simultaneously through a motor. According to the aircraft attitude control method for the full-aircraft drop test for the ship-borne early warning aircraft, manual active intervention is not needed, adjustments of the pitch attitude and the rolling attitude can be achieved automatically, and the problems of low efficiency and poor precision of a prior method are solved.

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.

This invention provides fall protection systems, in metal building construction, and methods of installing such systems. A given such system comprises a suspension fabric, supported by a grid-work of longitudinal and lateral support bands. At least one of the lateral support bands is a relatively softer steel having greater elongation properties, while having lower yield and tensile strengths. The balanced properties better distribute the force of a falling object to the respective members of the fall protection system so as to limit the force which must be tolerated by the suspension fabric, such that the system can catch and hold a dropped test load, or a worker falling onto such system, without catastrophic failure of the suspension fabric.

The invention relates to a multi-stage drop test machine to solve the problem that an existing drop test machine can not meet the requirement for multiple drop tests of samples easy to break. The multi-stage drop test machine comprises a support, a drop bottom plate is arranged at the bottom of the support, and the upper portion of the support is provided with a lifting platform which can be opened and closed. The multi-stage drop test machine is characterized in that a plurality of transfer layers are arranged between the lifting platform and the drop bottom plate; each transfer layer comprises a bearing plate which bears samples dropping from the upper layer and can be opened downwards, a lifting plate is arranged below the bearing plate and can be opened downwards to throw the samples, screen cloth is obliquely arranged between the bearing plate and the lifting plate, a chip collecting tank is arranged below the screen cloth, and an opening is formed in the lowest position of the screen cloth and communicated with the upper portion of the lifting plate. Series connection of a multi-layer transfer layer test and the multiple drop tests is adopted, during the multiple drop tests, chips are screened out, and the participating samples are thrown into the next test, and the requirement for the multiple drop tests of the samples easy to break is met.

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.

The invention discloses a device used for a steel ball drop and impact test. The device used for the steel ball drop and impact test comprises a screw elevator and a dropping straight pipe, wherein the screw elevator is arranged obliquely, the top end of the screw elevator is connected with the top of the dropping straight pipe, an impacting straight pipe is installed outside the dropping straight pipe, a plurality of inserting holes are evenly formed in the outer wall surface of the impacting straight pipe, a cuboid stop block is inserted into each inserting hole, and the volume, inside the impacting straight pipe, of each stop block is one fourth of the total volume of the stop block. The device used for the steel ball drop and impact test has the advantages that relevant conditions required by the drop test are met due to the arrangement of dropping pipelines and steel ball runways with corresponding sizes, drop and impact tests of steel balls with different specifications can be achieved, split detection is facilitated, smooth proceeding of the steel ball drop test can be ensured, a drop test of steel balls with different diameters can be achieved, transmission is achieved by the screw elevator, and the efficiency of a field test involved with steel balls with different specifications is improved.