8 results about "Specified load" patented technology

The invention relates to a rotor six-force-element loading method and device for a static test of a tilt-rotor aircraft. The testing device comprises a rack, a plurality of fixed pulleys installed on the rack, a motor fake part fixedly connected with a to-be-tested machine arm, a connecting rod system fixedly connected with the rotating end of the motor fake part, and a rope system, wherein one end of the rope system is connected with the connecting rod system, and the other end of the rope system penetrates through the fixed pulleys in a winding mode and then is used for loading a test load. The rack is provided with a test position used for placing a to-be-tested machine arm. A to-be-tested vehicle arm is installed on the motor fake part through a bolt. The weight is placed at the tail end of the rope, the function of loading a specified load is achieved, and then the purpose of checking the strength of the arm is achieved. The tilt-rotor aircraft arm rotor six-force-element static test device realizes tilt-rotor aircraft arm rotor six-force-element static test, is convenient and simple to operate, and is flexible and adjustable in loaded load.

The invention relates to the technical field of loading control, and discloses a multi-stage cooperative control-based loading system and method, and the system comprises a loading management unit which communicates with a real-time scheduling unit based on the Ethernet, is an upper computer of the loading system, and is used for synchronous control; the real-time scheduling unit carries out real-time scheduling on the plurality of flexible control unit hosts based on hardware real-time equipment and a real-time network, and is used for carrying out real-time scheduling calculation, synchronous coordination control and loading instruction real-time transmission on a loading system; the servo control unit is used for receiving a loading instruction of the real-time scheduling unit in real time, collecting force feedback and position feedback, setting a servo driver strategy, performing closed-loop servo control and outputting a specified load; the safety monitoring unit carries out safety monitoring on the loading management unit, the real-time scheduling unit and the servo control unit, so that a target tested piece outputs an accurate load, multi-stage cooperative control is realized, and high-precision, high-reliability and high-flexibility complex load loading application is realized.

The invention provides a tensioning method and a tensioning control system for integrally lifting a horizontal cable and a lifting cable of an arch rib, and the tensioning method comprises the following steps: when the arch rib is on a low-position assembly bracket, firstly, alternately tensioning the horizontal cable and the lifting cable to corresponding graded cable force values according to a specified load grade; after the horizontal cable force value reaches 90% of the designed cable force, the cable force is increased, then the cable force is tensioned to 100% of the designed cable force, and the arch rib is completely separated from the low-position assembly support; and after the arch rib is separated from the low-position assembly bracket and the horizontal cable force is tensioned to 95% of the designed cable force, the arch rib is gradually lifted to the designed elevation. On the control target, when the arch rib is on the low-position assembling support, whether the cable force of the horizontal cable and the cable force of the lifting cable reach the grading cable force value or not and the stake mark deviation are used as the checking target in the tensioning process; and after the arch rib is separated from the low-position assembled bracket, the stake mark deviation is used as a main control target in the tensioning process. By means of the tensioning method, accurate control over horizontal cable force and horizontal displacement of the folding end in the overall arch rib lifting construction process can be achieved.

The application discloses a unit ascending and descending load working condition optimization method based on historical working conditions, and collects historical ascending and descending load working conditions by fitting calculation on screening parameters and screening according to average fitting deviation and maximum deviation limit value. In actual matching process, the starting working condition load and the ending target load are set to ensure that the operation requirements of load ascending and descending operation are met. Different business priority needs in different business scenes can be met through different optimization methods, all working conditions under the same load ascending and descending condition are screened through setting a filtering time range, the optimized working condition is ensured to be accurate and reliable according to the optimization standard, the operation parameters under the specified load condition are adjusted according to the ascending and descending load working condition after optimization and the returned index data, the operation state of the unit reaches the optimum, the general unit ascending and descending load working condition optimization method shields business differences, provides an efficient and fast algorithm, greatly saves manpower, improves the calculation efficiency and improves the accuracy of business processing data.

The application belongs to the technical field of aircraft strength test, and particularly relates to a composite material failure simulation method based on extended finite element. The method comprises the following steps: S1, obtaining stress values of a composite material in a previous increment step during execution of a specified load loading process; S2, determining a fiber failure value and an inter-fiber failure value; S3, when the fiber failure value is greater than 1, calculating a first reduction multiple of material properties according to the fiber failure value, and when the inter-fiber failure value is greater than 1, calculating a second reduction multiple of material properties according to the inter-fiber failure value; S4, when the inter-fiber failure value is greater than 1, further determining a unit normal vector of a potential fracture surface in a global coordinate system for crack propagation; and S5, calculating stress values of a next increment step according to the reduced material properties, and returning to step S1. The application can accurately and efficiently simulate the failure behavior of the composite material.

The utility model relates to a wedge-shaped wire clamp mechanical performance test tool, which belongs to the technical field of electrical equipment testing, and is characterized in that when the wedge-shaped wire clamp mechanical performance test tool is used for carrying out a stress test on a wedge-shaped strain clamp, a pull rod is arranged on a base, and the test tool is inserted into a wedge-shaped shell; the parallel section of the test tool is inserted from the bottom of the mounting opening of the wedge-shaped shell, the upper plate body is exposed from the top socket of the wedge-shaped shell after insertion, and the wedge-shaped section is embedded into the wedge-shaped shell; a hook is connected to a top hanging hole in the top of the parallel section, the hook is connected with a traction mechanism, the traction mechanism pulls the test tool upwards, the bottom of a pull rod is connected with the hook, the hook is connected with the traction mechanism, the pull rod is pulled downwards, and test tension is applied to a load value specified by a product standard from two opposite directions. When various indexes of the wedge-shaped strain clamp meet standard requirements, the wedge-shaped strain clamp is qualified, and a stress test is performed before the wedge-shaped strain clamp is put into use, so that the use effect of the wedge-shaped strain clamp is ensured.

This invention discloses a biomimetic grid-reinforced foam sandwich composite material structure and its design and manufacturing method, relating to the field of composite material application and manufacturing technology. The biomimetic grid-reinforced foam sandwich composite material structure includes a composite material panel and an intermediate core layer. The composite material panel includes an upper panel and a lower panel; the intermediate core layer includes a composite material grid structure, foam filler, and embedded metal blocks. This invention uses a geometric topology optimization calculation method to obtain a composite material grid structure with the smallest volume that meets specified load-bearing requirements. This composite material grid structure simultaneously satisfies the requirements of lightest weight and excellent load-bearing performance.

The invention discloses a crane main beam plastic deformation detection method and system, and the method comprises the steps: carrying out the multi-round iterative measurement of a main beam left end point and a main beam right end point, and synchronously collecting the slope distance from a reference point to the left and right end points and the included angle between a corresponding laser beam and the vertical direction in each round of measurement; calculating the vertical distance of the left end point of the main beam and the vertical distance of the right end point of the main beam; the no-load main beam camber is calculated according to the measured vertical distance from the datum point to the main beam center point; a specified load is hung at the center point of a crane main beam, the load vertical distance from the datum point to the center point of the main beam is measured, and the load main beam camber is calculated; and calculating according to a main beam plastic deformation calculation formula to obtain the main beam plastic deformation, and judging whether the main beam plastic deformation meets the requirement or not. A plastic deformation result is accurately obtained through distance measurement and included angle cooperative calculation, multi-working-condition automatic continuous measurement is achieved, it is guaranteed that deformation detection data of the crane main beam is accurate, the process is efficient, and use safety and operation reliability of the crane are guaranteed.