24 results about "Vibration fatigue" patented technology

This utility model discloses a forced vibration fatigue testing device for thin metal sheets, belonging to the field of fatigue life testing technology for thin metal sheet materials. It addresses the problems of low vibration frequency, poor adaptability, and bulky structure in traditional testing devices. The device includes a trapezoidal impact platform base, a housing, a modular support frame, and a drive and detection mechanism. The support frame consists of an experimental support, a test piece platform, and limiting blocks, achieving rapid positioning and height adjustment of the test piece via bolts. The drive and detection mechanism includes symmetrically distributed motor and encoder assemblies. The motor drives the roller shaft via a coupling, causing the rollers to rotate at high frequency. The encoder records data in real time and provides feedback via a touchscreen. The trapezoidal base incorporates a shock-absorbing layer to improve stability, the modular structure reduces structural weight, it is adaptable to thin metal sheets of varying thicknesses, and the integrated touchscreen interface provides convenient operation. This device is suitable for high-precision fatigue life testing of ultra-thin materials such as aerospace flexible components.

This invention provides a novel vibration fatigue testing method for gas turbine blades. Addressing the problems of large specimen wear, long testing time, and limited results associated with traditional step-and-step stress loading methods for obtaining blade fatigue limits, this invention excites blade resonance on an electromagnetic vibration table using novel step-and-step stress loading techniques on identical blade specimens. While retaining the step-and-step matching standard, when limited test data cannot meet the matching requirements, a stress "concession" method is rationally applied based on the turbine blade structure and fatigue strength level to eliminate test data with significant stress deviations, thereby obtaining the median fatigue strength of blades from the same batch. This invention makes stress matching faster and more flexible, requiring only 2-3 stress levels to achieve a test fitting result with a confidence level of over 95%, demonstrating high accuracy. This method is applicable to fatigue limit tests of all gas turbine blades.

This invention discloses a non-contact force-vibration coupled loading material fatigue testing device and method, belonging to the field of material fatigue testing technology. It includes a support frame with a horizontal adjustment component mounted on it, and further includes: a first loading component mounted on the adjustment end of the adjustment component, comprising an electromagnetic drive power supply, an annular bearing disk, and several electromagnet components. The annular bearing disk is mounted on the adjustment end of the adjustment component, and the several electromagnet components are arranged in a circular array on one side of the annular bearing disk, with each electromagnet component sliding along the diameter of the annular bearing disk; and a second loading component, configured as a vibration fatigue machine mounted on the top surface of the support frame. The top of the vibration fatigue machine holds the workpiece to be tested via a clamping component, and the workpiece to be tested coincides with the axis of the annular bearing disk. Through testing, this invention effectively solves the technical problem of traditional vibration fatigue testing's inability to couple external loads, achieving accurate loading and performance testing of the specimen under highly simulated working conditions.

The application relates to the diesel engine technical field, in particular to a diesel engine heat dissipation damping device and a using method thereof, which comprises a damping protection box, a heat dissipation mechanism is fixedly arranged on the outer side of the damping protection box, balance guide rods are symmetrically arranged in the damping protection box, support mechanisms are symmetrically arranged on the balance guide rods in a sliding mode, and a diesel engine is arranged on the support mechanisms. The rubidium magnet on the buffer sliding block can be used for horizontal damping, the buffer clamping base can be used for vertical damping of the diesel engine, parts are prevented from being damaged due to long-term vibration fatigue, the service life of the diesel engine is greatly prolonged, the diesel engine is suspended in the damping protection box, the water tank, the water conveying main pipe and the water conveying branch pipe are communicated with each other and can form circulating water flow, and the semiconductor refrigerating sheet is used for heat dissipation of the water tank, so that the heat dissipation efficiency is improved.

This utility model relates to a pipe clamp gasket structure for reducing internal stress in pipes during multi-pipe installations. It includes a pipe clamp, which consists of an upper metal cover plate, a lower metal cover plate, and a pipe clamp gasket. The upper and lower metal cover plates are fixed to the pipe clamp gasket using bolts, nuts, or other fasteners. The advantages of this utility model are that by using nylon with high external hardness to support the pipes and suppress pipe vibration, while the internal low-hardness rubber effectively reduces stress between the pipe clamp and the pipe during dynamic vibrations during installation. This reduces the risk of vibration fatigue and durability failure.

This application belongs to the technical field of vibration fatigue test design for aircraft panel structures, specifically relating to an in-plane prestressed loading vibration fatigue test system for aircraft panel structures. The system includes a vibration support fixture and a prestressed loading fixture connected to the panel structure. The prestressed loading fixture is used to apply in-plane prestress to the panel structure, including tensile prestress and compressive prestress. The vibration support fixture is used to support the panel structure, the prestressed loading fixture, and to connect to a vibration table for vibration loading of the panel structure.

The application provides a novel vibration fatigue test method for a gas turbine compressor blade, which uses a material fatigue test statistical analysis method, uses a novel stress loading method on a blade test piece to excite blade resonance in a wide stress level coverage and a large number of stress level series, reasonably corrects stress levels according to a stress 'yield' principle, fills in the missing test stress sub-samples, reduces the dispersion of test data, and makes the stress sub-sample pairing more flexible and fast, and then obtains the median fatigue strength of the same batch of blades. The method can greatly save test cost, save test time, and avoid problems such as high test data variation coefficient or low confidence level caused by the structure itself characteristics or processing process error.

The present application relates to the technical field of pipeline structure reliability analysis, in particular to a pipeline structure reliability analysis method under interval uncertainty, comprising: collecting basic parameters affecting the vibration fatigue life of the pipeline structure; establishing a function function in reliability analysis; standardizing the input vector and the function function; establishing a reliability model of the pipeline structure under interval uncertainty with the standard function function as a constraint; introducing an intermediate variable for equivalent conversion; solving by using the dichotomy combined with the random search feasibility judgment method to obtain the reliability index of the pipeline structure. The present application solves the problems of difficulty in solving the black box function and difficulty in ensuring global convergence in the vibration fatigue life analysis of the engine pipeline structure by using the interval reliability analysis framework of the dichotomy combined with the random search feasibility judgment.

The application belongs to the field of combustion chamber design, and particularly relates to a low-emission combustion chamber support ring, which comprises a support ring and a door-shaped pressing block. The support ring is arranged between a flame tube and a casing and is in the form of a wavy annular strip. The door-shaped pressing block is connected between the support ring and the flame tube in multiple groups and at intervals, and the support ring and the flame tube are fixed to each other. The support ring can freely slide in the circumferential direction after passing through the door-shaped pressing block. The complete 'convex' annular structure is adopted to improve the support rigidity and the damping effect on vibration. The door-shaped pressing block is used to install the support ring, so that the stress concentration problem of spot welding seams is avoided, the structural reliability is improved, and the support ring can freely slide in the circumferential direction under the pressing block, so that the deformation coordination capability is improved. Even under the working condition of the gap change between cold and hot states, the damping effect can be continuously exerted, the vibration fatigue of the flame tube is reduced, and the overall service life of the combustion chamber is prolonged.

This invention discloses a method, system, equipment, and medium for identifying wind-induced fatigue points in power transmission lines, relating to the field of disaster prevention and mitigation for power transmission lines. The method includes: dividing the continuous pulsating load data of the conductor into multiple wind speed intervals; selecting typical pulsating loads from the continuous pulsating load data in each wind speed interval using a statistical algorithm; applying the typical pulsating loads of each wind speed interval to a constructed finite element model of the conductor insulator; calculating the total cumulative damage rate of the conductor using a dynamic damage integration algorithm; performing a life assessment based on the total cumulative damage rate to obtain the fatigue life of the conductor; and if the fatigue life determines that the conductor belongs to a high-risk line section, then fatigue point identification is performed on the conductor. This method not only improves the efficiency of detection and the accuracy of fatigue life calculation, reducing the workload of manual inspections, but also promptly detects potential fatigue damage, thus providing strong protection for the safe operation of power lines.

This invention discloses a vibration fatigue testing device and method for achieving a gradient temperature field, including a high-temperature furnace. The high-temperature furnace includes a temperature control box, a furnace chamber, a specimen clamping panel, an observation window panel, and a specimen fixture. The temperature control box is a box-shaped structure with openings at both ends and a hollow interior, with the furnace chamber embedded inside. The furnace chamber is used to form a gradient temperature field inside the temperature control box. The specimen clamping panel is fitted at the first opening of the temperature control box, and the observation window panel is fitted at the second opening of the temperature control box. The specimen fixture is rotatably mounted inside the specimen clamping panel, with one end of the specimen to be tested clamped and fixed on the specimen fixture, and the other end of the specimen extending into the interior of the temperature control box. The outer side of the specimen clamping panel or the bottom of the temperature control box is connected to a vibration excitation mechanism. This invention has a simple structure, high accuracy of test results, effectively improves the reliability of the vibration fatigue testing process, and reduces the additional energy consumption of the vibration test.

The application relates to a communication system performance test method and device, computer equipment and a storage medium. The method comprises the following steps: determining a plurality of target communication devices from a communication system to be tested based on preset selection rules; obtaining actual performance test data of each target communication device in an actual deployment environment and simulation performance test data of the target communication device in a simulation test environment; the actual performance test data is obtained by actually testing the target communication device based on characteristic information of the actual deployment environment; the simulation performance test data is obtained by applying a preset vibration fatigue damage spectrum to the target communication device in the simulation test environment; and the performance test result of the communication system is determined according to the actual performance test data and the simulation performance test data of the target communication devices. The method can test the performance of the communication system under the coupling of multiple platforms and multiple regions.

This invention discloses a high-temperature vibration fatigue testing system for gas turbine blades, comprising a high-temperature chamber, an electromagnetic vibration table, a clamping fixture, two or more independently controllable heaters, and a thermal energy circulation unit. The blade sample is placed inside the high-temperature chamber and clamped onto the surface of the electromagnetic vibration table using the clamping fixture. The blade surface is divided into two or more independent temperature zones. The outlet of each heater is connected to the high-temperature chamber via an independent duct, and the outlet of each independent duct corresponds to a temperature zone on the blade sample. An electric valve is installed on each independent duct. This invention, by forming a matrix heater system with multiple independently controlled heaters corresponding to the temperature zones of the blade sample, and in conjunction with independently controllable ducts, creates a non-uniform temperature field distribution on the blade sample. The physical structure ensures the independence and accuracy of temperature control in each zone, thus obtaining the influence of the turbine blade temperature gradient on its high-cycle fatigue performance.

The present application relates to the technical field of weld vibration fatigue life evaluation, and particularly relates to a weld vibration fatigue life evaluation method based on a simplified modal structure stress method. Specifically as follows: a simplified finite element model of a welded structure not containing weld details is established, and the structural modal of the simplified finite element model is calculated; the modal coordinate time history is obtained according to the structural modal, and the modal structural stress at the weld toe is calculated through linear difference; the modal coordinate time history and the modal structural stress at the weld toe are superimposed to obtain the structural stress time history at the weld toe; the structural stress change range and the cycle number are obtained through rain flow counting statistics according to the structural stress time history at the weld toe; the equivalent structural stress is calculated; and the damage and fatigue evaluation results of the weld are obtained by using the main S-N curve method. The modal structural stress at the weld toe is calculated through linear difference, the work load of establishing the finite element model can be greatly simplified without establishing the weld details, the modeling complexity is reduced, and the modeling efficiency is improved.

The application discloses a kind of welded structure harmonic response structural stress fatigue life prediction method, comprising the following steps: step 1: build the finite element model of welded structure containing weld;Step 2: using unit external load to the finite element model of welded structure harmonic sweep frequency obtains node response displacement;Step 3: according to external load coefficient obtains the unit stiffness matrix and node displacement under external load, as follows: step 4: calculate the simple harmonic response structural stress and equivalent structural stress of structure.The welded structure harmonic response structural stress fatigue life prediction method of the application: (1) compared with traditional quasi-static method, can solve the problem that quasi-static method cannot be carried out vibration fatigue evaluation, (2) compared with frequency domain structural stress method, can solve the problem that frequency domain structural stress method cannot evaluate simple harmonic vibration fatigue, (3) compared with traditional transient structural stress method, the method of the application is more efficient, and the result error is very small.

The utility model discloses a kind of vibration and shock double-control support, comprising: upper connecting plate, lower connecting plate, horizontal shock isolation unit and vertical vibration isolation unit, horizontal shock isolation unit is located between upper connecting plate and lower connecting plate;Horizontal shock isolation unit is lead core laminated rubber support;Vertical vibration isolation unit is equipped with several, and array is arranged on the upper connecting plate and lower connecting plate, and vertical vibration isolation unit on the upper connecting plate and lower connecting plate is symmetrically arranged along lead core laminated rubber support.The vibration and shock double-control support vertical vibration isolation unit and horizontal shock isolation unit function do not couple each other, function does not interfere each other, effectively improve the flexibility of construction, maintenance, and avoid the problem that vertical flexible unit in existing coupling scheme can fail due to unable to withstand earthquake shear force, avoid unnecessary micro high-frequency vertical vibration fatigue of lead core laminated rubber support in normal use, guarantee the structural safety and reliability.

The application discloses a motor base multidirectional vibration test tool and method which can be preloaded in a plane. The test tool comprises a bottom plate, a motor base mounting unit and a load applying unit arranged on the bottom plate. The motor base mounting unit is used for mounting and fixing the motor base, and the load applying unit is used for applying tension and torque simulating actual working conditions to the motor base. The test method comprises the following steps: preloading tension and torque simulating actual working conditions to the motor base on the vibration test tool; and fixing the motor base with preloaded tension and torque and the test tool as a whole on a vibration test device to perform multidirectional vibration test. The test tool of the application realizes the function of applying tension and torque under actual working conditions to the motor base on the vibration table plane through a simple structure. In combination with the vibration test device, the vibration fatigue test of the motor base under the "tension+torque+vibration" multi-load combined working condition is realized, a test environment which is more in line with actual working conditions and more scientific and reliable is constructed, and the test precision is improved.

This invention relates to the field of testing device design technology, and provides an arc-shaped vibration fatigue testing fixture, including a base, a lower curvature adjustment pad, a limiting pad (optional), and an upper curvature adjustment pad. This invention, through its arc-shaped clamping end design, can transfer the maximum stress at the clamping end to the working section of the specimen, effectively avoiding stress concentration at the clamping end. Furthermore, it improves testing efficiency, saves costs, has wide applicability, can amplify vibration response (increase vibration frequency), significantly improves detection efficiency, shortens the testing cycle, and has versatility.

The application discloses a symmetrical force balance type high-frequency impact device and belongs to the technical field of mechanical performance testing. The device comprises a base, a test piece mounting table 2 located in the middle, a first impact assembly 3 and a second impact assembly 4 symmetrically distributed on both sides and a control system. The two impact assemblies are driven by linear driving units 31, the axes are collinear and the actions are synchronous. When working, the impact hammer heads 33 on both sides simultaneously accelerate to impact the test piece towards the center or simultaneously retreat in the reverse direction. The symmetrical action makes the reaction forces generated by the impact cancel each other out in the system, greatly reducing the vibration interference on the base and the foundation. The application adopts a voice coil motor or a linear motor to drive, can realize high-frequency and high-acceleration impact loading and is especially suitable for vibration fatigue and impact life test of contact net parts, and has the advantages of compact structure, high test precision and good self stability.

This invention relates to the field of aero-engine testing technology and discloses a universal fixture for high-temperature, high-cycle vibration fatigue testing of irregularly clamped blades. The fixture consists of a cylindrical main structure and a clamping structure. Finite element simulation design ensures that the resonant frequency is close to the blade's resonant frequency, amplifying the vibration stress. The fixture is made of high-temperature alloys and single-crystal high-temperature alloys, and the fasteners are high-temperature resistant hexagonal bolts, the diameter and number of which can be adjusted according to the blade shape. The fixture is easy to operate and suitable for high-temperature and room-temperature vibration fatigue testing. In one embodiment, the fixture is equipped with a mounting platform and a locking system to achieve automatic positioning, fixing, and convenient removal of the blade clamping end, improving testing efficiency. In another embodiment, the hydraulic fixture system adopts a central cylinder and single-cylinder design, using hydraulic fluid to clamp the blade. Different hydraulic fluid media can be selected according to the testing environment, such as liquid silicone at 800 degrees Celsius.

The utility model relates to the technical field of automobile parts, and disclose a kind of automobile pipeline support, including support, still include: multiple mounting holes being opened in the top of support, the outer wall bottom of support is fixedly connected with fixed block, the bottom bending of support brazing welding has pipeline, by support and pipeline adopt brazing welding, can effectively avoid the damage to pipe due to welding, reduce the cracking of pipe from welding due to vibration, improve the qualified rate of product, and can effectively improve the reliability and durability of whole car pipeline system, avoid the high temperature thermal influence problem of ordinary welding, will not cause parent metal deformation, and brazing forms metallurgical bonding joint high strength, good sealing, can completely satisfy the stringent requirement of automobile pipeline system to prevent leakage, the continuous uniformity of braze seam makes it have excellent anti-vibration fatigue performance, not prone to crack under long-term driving vibration environment.

This invention belongs to the field of aero-engine component testing, specifically relating to a reference specimen, a marking specimen, and a method for marking vibration fatigue limit tests. The reference specimen for marking vibration fatigue limit tests is an integrated structure comprising: a clamping section, a narrow waist section, and a counterweight section connected sequentially; wherein the clamping section is used to connect to a vibration test bench; the narrow waist section and the counterweight section are in a cantilever state during the test; the counterweight section has counterweight holes for connecting counterweight structures of different weights. The counterweight section of this invention, by providing counterweight holes, allows a single specimen to have multiple counterweights to accommodate vibration benches of different frequencies, offering advantages such as reduced testing costs and increased testing efficiency.