4367results about "Shock testing" patented technology

Apparatus, systems, and methods for monitoring head acceleration and / or forces acting thereon are disclosed. A device for monitoring an acceleration or a force acting on the head of a user includes a flexible article adapted to be worn on the head of the user; and a monitoring assembly coupled to the flexible article. The monitoring assembly includes a sensor for measuring a force on the head and transmitting data relating to the force, the sensor disposed proximate to the head, a processor adapted to receive the force data from the sensor, and a flexible strip operatively connecting the sensor and the processor.

A method and apparatus for testing a football helmet utilizes a weighted pendulum arm to impart an impact force upon the helmet. Linear head acceleration and rotational head acceleration caused by the impact force is measured and a Head Impact Power Index is computed and used as a standard to judge the ability and effectiveness of the football helmet in preventing injury to a football player.

The invention discloses a test method for real object crash of vehicle components and a test device thereof. The test method comprises the following steps: the vehicle components are fixed on a carrying trolley which can move on a track, the speed of the trolley is increased to a test value by traction with a drive system before preparing for crash an impact wall; when the carrying trolley moves to a set position before the impact wall, a trigger device is started to detach the drive system from the carrying trolley, a test component and the carrying trolley are caused to crash the impact wall without drive power; a vehicle-borne acceleration test system is arranged on the carrying trolley so as to complete data acquisition in real time; and the trigger device triggers a speed test system, an impact force test system and a high-speed camera system at the same time. The test method of the real object crash of the vehicle components and the test device can help measure objective data in real time such as the impact force, a transient acceleration, component deformation and speed output at the moment of crash, and further can record deformation sequence images of the components during the whole crash course so as to get scientific and exact analysis results.

A system and method for detecting structural damage is provided that utilizes a general order perturbation methodology involving multiple perturbation parameters. The perturbation methodology is used iteratively in conjunction with an optimization method to identify the stiffness parameters of structures using natural frequencies and / or mode shape information. The stiffness parameters are then used to determine the location and extent of damage in a structure. A novel stochastic model is developed to model the random impact series produced manually or to generate a random impact series in a random impact device. The random impact series method or the random impact device can be used to excite a structure and generate vibration information used to obtain the stiffness parameters of the structure. The method or the device can also just be used for modal testing purposes. The random impact device is a high energy, random, and high signal-to-noise ratio system.

The invention relates to a vibration table detection instrument field. In order to overcome the defects of the prior art, a signal processing approach is designed to allow a virtue instrument to be applied to the measurement field and an instrument suitable for measurement is designed accordingly on the basis of the signal processing approach. More particularly, the invention relates to a virtual vibration table detecting signal processing method and the instrument. The method comprises the processes: (1) the acceleration value of the vibration table is collected and converted into electric signals; (2) the signal is conditioned by a signal conditioning instrument; (3) the conditioned signal is collected by a data collecting card and transmitted to a computer; (4) the signal is preprocessed by the computer; (5) the preprocessed signal is discrete Fourier transformed and digital signal frequency domain filtered; (6) in the end, a speed component is output after the signal is integrated for one time; a displacement component is output after the signal is integrated for two times. The detection instrument comprises an acceleration sensor, a signal conditioning instrument, a data collecting card and a computer.

A ramp-type collision experiment system and method for car is disclosed. Said system is composed of a drawing-guiding unit consisting of supporting frames at high end of ramp, steel cable, winding machine and supporting roller, a ramp consisting of horizontal transition segment, curved transition segment and straight acceleration segment, a experiment segment, an observing tower with test equipment, and acceleration tester in experimental car.

A system for monitoring physical and environmental conditions of an object can include one or more sensing devices affixed or mounted to the object. The sensing devices produce sensor data (e.g. motion, vibration, impact, temperature, stress and strain) that can be used to anticipate failure or for operation and / or maintenance purposes. The sensing devices can positioned on structures such as a building or an oil rig, on vehicles such as on airplanes, trains, ships and motor vehicles, and on moving devices such as wind turbines and draw bridges.

Embodiments of a crash simulator sled assembly are disclosed. The crash simulator sled assembly can include a sled, an element movable relative to the sled, and a force element, such as a damper assembly or actuator assembly, coupled to the element. A second sled can also be connected to the element. The damper assembly can control relative movement of the element relative to the sled, while the actuator can develop force to replace force attributable to mass. This provides advantages for more efficient and effective test crash simulation and research.

Closely spaced conventional optical fibers are arranged in a grid placed between a first surface and a second surface. A penetrating impact onto the first surface results in a hole of a size proportional to the diameter and velocity of the impacting object. The size and shape of the debris plume that travels between the first and second surfaces is also proportional to the diameter and velocity of the impacting object. If the debris plume is sufficiently energetic, a number of the fibers in the grid are broken. The size and shape of the area defined by the broken fibers can be determined simply by determining which fibers are no longer transmitting light. Analytical methods are then used to relate the extent of the damaged area to the location of an MOD impact, the direction from which the impact occurred, and the size of the impacting object.

The invention discloses an experiment testing method and device to test stressed state of product when falling on the ground. It has a clamping device to hang the object, and a piezoelectricity sensing platform is set under it. A CCD camera is set outside the platform. Impact accelerometer is set on the testing point of the testing object. Using a monitoring program to start clamping device to drop the object in free falling state, recording the process until the object knocking at the piezoelectricity sensing platform trigger circuit, starting CCD camera to capture the process, calculating falling angle, taking simulation test, and comparing simulation G value and accelerometer testing G value, the accurate testing value would be gained. It would effectively improve economic benefit.

The invention discloses a multi-way high-energy high-speed electromagnetic force impact intelligent control testing device and method. The device comprises an electromagnet component, an impact rod, an outer sleeve, an electromagnetic acceleration coil group and an impact hammer, wherein the electromagnet component, the impact rod and the impact hammer are arranged above the outer sleeve, in the sleeve and below the sleeve, respectively; multi-stage electromagnetic acceleration coils arranged at the periphery of the impact rod are respectively and externally connected with a circuit control system. According to the method, acceleration is realized through sequential electromagnetic functions of the multi-stage electromagnetic acceleration coils in a moving process of the impact rod, and the impact energy and speed are increased and can be adjusted; the impact is set and limited in any direction through a base and the electromagnet component. According to the device and method, the electromagnetic stage acceleration impact rod is adopted, the impact speed and impact energy of the impact rod can be effectively increased and adjusted, the direction can be set according to the needs, the impact force is over 1000 times that of the weight of the impact hammer, the maximum times approximates to 3,000, a mains supply is used as a power source, and the device is well applied to a solid dielectric test in the field of civil engineering.

The invention discloses an adjustable test fixture device, which comprises an H beam base, two support bases arranged on the H beam base and clamped pressure sheets arranged on the tops of the support bases; two pairs of support base guide grooves are arranged on an upper wing plate of the H beam base; and one support base is movably connected to each pair of support base guide grooves. The device disclosed by the invention is simple for operation and high in precision; the positions of the support bases can be adjusted through the guide grooves on the upper wing plate of an H beam, so that the distance between the support bases can be adjusted, thus, the purpose of applying to test pieces with different geometrical sizes can be achieved; different boundary types can be realized by replacing the types of the support bases on the upper wing plate of the H beam; and the H beam base can move, thus, the adjustable test fixture is convenient to experiment and test in different places and has a certain portability.

Deterioration of reinforced concrete pipes is checked and the deterioration progress level is classified. Based on the inspection result, a portion to be inspected in detail in an inspection area is selected. With respect to the selected portion to be inspected in detail, the pipe thickness and the diameter of reinforcing bars are measured and the location of reinforcing bars in the portion to be inspected in detail are checked. Using the data of the thickness of a pipe, the diameter of the reinforcing bar and disposition of the reinforcing bars, structural analysis is carried out and the strength of the reinforced concrete pipe is calculated. The calculation result is used as information for evaluating the deterioration state of the reinforced concrete pipe.

In one embodiment, a method for testing a helmet comprising the steps of: placing a strike helmet on a first headform; placing a target helmet on a second headform, colliding the strike helmet against the target helmet; and measuring the acceleration of the second headform caused by the collision.In a second embodiment, an apparatus for testing a helmet comprising: a strike helmet placed on a first headform; a target helmet placed on a second headform; a motion device for moving the strike helmet to collide with the target helmet.In a third embodiment, a helmet comprising: a shell having a zone of a greater rigidity; having a zone of a lesser rigidity; wherein the zone of lesser rigidity covers a portion of the frontal bone of a wearer.

The invention discloses a steel ball drop test machine. The test machine comprises: a base plate, a support, a steel ball adsorption assembly, a coaming, a fixture assembly, a shielding assembly, an electrical box, an operation box, a first laser light, a photoelectric sensor, a guide rail and a second laser light. By using the above technical scheme, a platform clamping column which is used to fix a mobile phone can be suitable for the mobile phone with different sizes and can be adjusted up and down so as to adapt the mobile phone with different thicknesses. An acting point can be selected arbitrarily in a mobile phone screen scope and an accuracy is in positive or minus 1mm. A second drop prevention assembly is controlled simultaneously by a cylinder and an electromagnet so as to prevent sudden generation of power off or air-cut off. An infrared sensor can perceive the drop of the steel ball and start the second drop prevention assembly.

The invention provides an automobile side surface collision simulation testing device, belonging to the technical field of automobile collision simulation; the device can re-show the real mechanic environment of the side collision of the automobile, can be used for the detection and design improvement of driving safety products and driven safety products such as automobile doors, safety belt, safety lock, safety seat, safety airbag, automobile interior and the like, and can provide a mean for human biomechanics research under collision environment; the automobile side surface collision simulation testing device forms an automobile collision simulation system by a hydraulic automobile door energy absorber, a trolley energy absorber and a brake energy absorber which are arranged on a simulation movable obstacle vehicle; and the trolley is provided with a vehicle door motion control mechanism and a seat motion control mechanism. The automobile side surface collision simulation testing device has the beneficial effects that the automobile side surface collision simulation testing device can clearly reflect the motion relationship of the automobile door, the seat and the automobile door during the side surface collision of the automobile, can simulate the working environment of the driving and driven safety products during the side surface collision process of the automobile and has the advantages of high simulation precision, simple design procedure, compact structure of the device, small volume, easy operation and the like.

The invention provides a vertical dropping impact test system which comprises a weight-adjustable load, a suspension assembly, a monitoring subsystem, a support frame and a failure protective device. The weight-adjustable load is used for impacting a tested device, the suspension assembly is used for controlling the dropping height of the weight-adjustable load, and the monitoring subsystem is used for monitoring impact procedures; the weight-adjustable load is arranged on the support frame and can move up and down along the support frame, the tested device is arranged right below the weight-adjustable load, the suspension assembly is arranged on the support frame and can adjust the dropping height of the weight-adjustable load, the failure protective device is arranged on the support frame, can move up and down along the support frame and can be locked with the support frame so that the weight-adjustable load can stop dropping, and the suspension assembly and the failure protective device can act under the control of the monitoring subsystem. The vertical dropping impact test system has the advantages that integral procedures of impact or vibration tests and test parameters can be completely recorded, test results are accurate, and the vertical dropping impact test system is high in reliability.

A tactile sensing garment of intelligent robot consists of garment wearing on intelligent robot and tactile sensing unit set on said garment. It is featured as forming said tactile sensing unit by both top and bottom film electrode plates with each electrode contact being corresponded one by one as well as with one electrode contact being arranged in line array form and another one being arranged in column array mode, sticking a conductive rubber on each electrode contact of bottom film electrode plate and setting a backing strap with holes corresponding to said conductive rubber between two said film electrode plates.

A method is provided for testing the tightness of an electric machine stator core includes: introducing a test instrument that is connected to a movable support into an air gap between a stator core and a rotor, locally placing the test instrument and locally testing defined zones of the generator stator core. A device for carrying out the method is also provided.

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 provides a laser positioning device. The laser positioning device comprises a horizontal support frame, a sliding mechanism, a vertical support, a laser instrument mounting plate, a displacement measuring device and a laser instrument, wherein the horizontal support frame comprises two horizontal and parallel cross beams and a horizontal connecting beam for connecting the two cross beams; the sliding mechanism is limited on the connecting beam in a clamping mode and can move in the direction of the connecting beam; the vertical support is fixed on the sliding mechanism and extends upwards; the laser instrument mounting plate is limited to the vertical support in the clamping mode and can move up and down along the vertical support; the laser instrument is mounted on the laser instrument mounting plate; the displacement measuring device comprises a magnetic railing ruler, a magnetic sensor and a data display screen, the magnetic railing ruler is arranged on the side wall of one side of the front side and the rear side of the connecting beam, the magnetic sensor is fixed on the sliding mechanism and can move along with the sliding mechanism, the magnetic sensor is in contact with the magnetic railing ruler, the data display screen is electrically connected with the magnetic sensor, and the magnetic sensor is used for recording the displacement along the magnetic railing ruler and transmitting the displacement to the data display screen for displaying.

A microelectromechanical device includes a semi-flexible proof-mass comprising a primary part, a secondary part and a stiff spring suspending the primary part and the secondary part. The spring causes the parts to move as a single entity when the device is in its normal range. A first stopper structure stops the primary part. The proof-mass is configured to deform through deflection of the spring, when the device is subjected to a shock having a force that is beyond the normal operation range. While the shock causes motion of the proof-mass in one direction along an axis of movement, the spring is configured to cause a restoring force causing the secondary part of the proof-mass to be driven into a restoring motion in a direction opposite to motion along an axis caused by the shock. Momentum of the secondary part causes the primary part to dislodge from the first stopper structure.

The invention discloses a bidirectional static and dynamic loading roof key block caving test device and method, and the device comprises an overall frame, a lateral pressure loading system, a vertical pressure loading system, a lateral pendulum bob impact disturbance system, a vertical drop-hammer impact disturbance system, an incident wave monitoring system and a response measurement system. Thetesting method comprises the steps: a first work condition: carrying out the bidirectional static and dynamic loading disturbance testing of a tunnel overall model sample to explore the initial stress state of the surrounding rocks of a tunnel and the initial stress condition of a key block rock, and observing an overall phenomena of the propagation law of cracks, a forming process of a key blockand the instability of the key block in the disturbance process; a second work condition: carrying out the bidirectional static and dynamic loading disturbance instability testing of a key block model sample, taking the result under the first work condition as the basis, abstracting the key block and the surrounding rocks at two sides to more precisely explore the law that a stress wave causes the propagation of cracks, a critical condition that the key block slides in an instable manner, and an action mechanism that the disturbance effect causes the instability.

The invention relates to a test bed, which comprises a frame and a first test part for impact test of an automobile door. The first test part comprises a first rope pay-off and take-up mechanism, a pull cable mechanism, an elastic mechanism and a first monitoring mechanism, wherein the first rope pay-off and take-up mechanism is sued for opening an automobile door, the pull cable mechanism is used for unlocking the automobile door, the elastic mechanism is used for applying elastic force to the automobile door to close the same, the first monitoring mechanism is used for monitoring impact of the automobile door in closing, the first rope pay-off and take-up mechanism, the pull cable mechanism, the elastic mechanism and the first monitoring mechanism are respectively disposed on the frame, and the first monitoring system comprises a first angular speed sensor disposed on the edge of the automobile door. The test bed can be used for precisely controlling impact speed, so that accuracy of data testing is improved, and reliability of the test bed is improved.

A method for performing bridge monitoring by using multiple strapdown inertial systems belongs to the bridge monitoring technology and includes: performing position setting for the strapdown inertial systems according to the dynamic characteristic of a bridge structure and performing installation calibration and initial calibration for the strapdown inertial systems; carrying out bridge dynamic load tests which include a pulsating test, a sports car test and a bumping test, and performing continuous monitoring by using deformation and vibration information of the strapdown inertial systems relative to a reference point and measurement points; obtaining static deformation angles and dynamic deformation angles of the measurement points of the bridge at each moment by using the deformation information obtained in an inertial test matching method; obtaining a girder deflection curve of the bridge by using the dynamic deformation angles of the inertial systems calculated at the reference point and the measurement points, and obtaining an impact coefficient of the bridge through further processing; using accelerometer output information to obtain acceleration time history curves of all the measurement points and obtaining displacement time history curves through integration; and analyzing the acceleration time history curves and the displacement time history curves in a time domain analysis method and a frequency domain analysis method to obtain structural parameters including bridge amplitude, damping ratio and vibration mode. The method has the advantages of being free of weather variation interference, little in manual operation, high in automatic degree and capable of performing continuous measurement.

According to exemplary embodiments of the present invention, a fracture prediction device for a spot welded portion can be provided. For example, the device may include an input arrangement configured to input all or some of a material strength, a plate thickness, a nugget diameter of a spot welding, a plate width of a joint, and a rotation angle of the joint in a tension test, based on a cross tension test and / or a shear tension test at a spot welded joint. The device can also include a first calculation arrangement configured to calculate a fracture strength parameter of the spot welded portion from all or any of the material strength, the plate thickness, the nugget diameter of the spot welding, the plate width of the joint, and the rotation angle of the joint in the tension test. A parameter storage arrangement may also be provided which can be configured to store the fracture strength parameter by each steel type. Further, the device may further have a second calculation arrangement configured to determine a fracture of the spot welded portion by installing the fracture strength parameter stored in the parameter storage arrangement into a fracture prediction formula in which a deformation at a periphery of the spot welding is modeled by a finite element procedure. Exemplary embodiments of the method software arrangement and computer accessible medium performing similar procedures can also be provided.

The invention discloses an energy-saving hydraulic seal experiment table and a method thereof. The experiment table consists of an experimental cylinder, a driving loop of the experimental cylinder and a loading loop, and is characterized in that the experimental cylinder consists of a left cylinder cover, a left guide sleeve, a cylinder barrel, a piston, a piston rod, a right guide sleeve and a right cylinder cover; the driving loop of the experimental cylinder comprises a variable pump, a safety valve, a filter, a solenoid valve, etc; and the loading loop comprises a fixed displacement pump, an overflow valve, a filter, a solenoid valve, an accumulator and a stop valve. The experiment table can conduct experiments on various sealing rings of the piston and the piston rod, carry out online inspection of the sealing performance and the tribological properties of the sealing rings and the manufacturing quality of sealing elements, and perform experiments on a plurality of sealing elements to be detected simultaneously. The experiment table has the advantages of adjustable experiment speed and pressure, and excellent energy-saving effect.