7 results about "Increased fatigue" patented technology

The invention relates to the technical field of connector monitoring, in particular to a method and a system for monitoring faults of a connector in real time. The method comprises the following steps: acquiring object data of a connector, acquiring operating environment parameters including temperature, humidity, current, voltage and vibration conditions, and comprehensively evaluating the operating state of the connector; the mechanical toughness deterioration trend of the connector is detected, the gradual change failure condition of the contact interface is further analyzed, and the dynamic power attenuation degree of the connector is predicted; analyzing an internal component loss condition caused by the heat effect, and detecting a fatigue aggravation condition in the connector; and the aging trend of the assembly is evaluated according to the fatigue aggravation degree, the overall stability degradation degree of the connector is further evaluated, accurate monitoring of the connector fault is finally realized, and connector fault data is obtained. According to the invention, the connector fault identification is optimized, so that the connector fault identification is more accurate.

A kind of fatigue tester belongs to performance detection device technical field.The utility model discloses a kind of fatigue tester for hydraulic cylinder, reduce the hydraulic cylinder fatigue tester of damage to hydraulic cylinder for carrying out durability experiment for hydraulic cylinder.The utility model includes frame, rotating motor, rotating motor coupling connected with rotating motor motor shaft, servo motor, translation motor, coupling, rotating mechanism and upper installation sliding block mechanism are installed on the frame, servo motor articulation connecting rod mechanism is installed on the frame lower surface, hydraulic cylinder bottom fixing mechanism is installed on the lifting platform screw of servo motor articulation connecting rod mechanism.The utility model increases fatigue detection function on the basis of durability experiment, is separated from manual operation, is completed by mechanical body, increases the safety of personnel, through the design of structure, can be accurately carried out million times experiment without damaging hydraulic cylinder.

This application provides a method and system for predicting the fatigue performance of composite materials based on infrared thermal imaging, belonging to the field of material mechanical property testing technology. The method includes determining the fatigue performance characterization parameters and corresponding static strength values ​​of the composite material to be predicted; constructing a fatigue performance testing system for the composite material; determining the progressively increasing fatigue loading stress and load; applying progressively increasing stress levels of fatigue cyclic loading to the composite material under a given cycle to obtain a temperature field sequence and extracting temperature characteristic parameters characterizing the material's energy dissipation state; based on the temperature characteristic parameters and a composite material damage infrared characteristic library, obtaining the temperature-damage characteristic-stress relationship of the composite material under each cyclic loading level; based on this relationship, obtaining the critical transformation stress of the composite material to be predicted, determining the fatigue limit, and obtaining the fatigue life-stress relationship for fatigue performance prediction. This scheme improves prediction efficiency and accuracy, and avoids misjudgment based on a single parameter.

The utility model belongs to the field of lighting equipment, in particular to a color-changeable photographic flashlight. Aiming at the problem that the existing handle is short and cannot be adjusted, people need to hold the flashlight high in some occasions, and raising the arm for a long time easily increases fatigue, the following scheme is proposed, which includes a flashlight body, one side of the flashlight body is threadedly connected with a mounting seat, the other end of the mounting seat is rotatably connected with a connecting seat, the other end of the connecting seat is fixedly provided with a fixing sleeve, one side inner wall of the fixing sleeve is integrally formed with two rows of first clamping blocks; a sliding sleeve, the sliding sleeve is slidably connected to the outer wall of the fixing sleeve, and one side outer wall of the sliding sleeve is provided with a penetrating mounting groove. In the utility model, the length of the flashlight handle can be adjusted, so that the staff no longer needs to hold the arm high, which reduces the labor intensity of the staff, and can also facilitate air circulation and reduce the amount of sweating when holding the handle.

A method of increasing fatigue life in vibratory casing recovery assemblies. In a vibratory casing recovery bottom hole assembly having a casing spear, one or more drill collars and a vibratory device, at least the coupling between the casing spear and the first drill collar is made-up with a reduced torque as compared to the API minimum recommended make-up torque for the coupling. A method of recovering casing using the vibratory casing recovery bottom hole assembly is also described.

An improved pressure sensor includes one or more features for reducing stress at a weld joint fixing a header assembly to a pressure port. The feature(s) can include an undercut formed in a bore of the pressure port and / or a backplate that at least partially covers the weld joint.

This invention discloses a grip strength ball for rehabilitation of hemodialysis patients, belonging to the field of medical device technology. It aims to solve the technical problem that existing grip strength balls, which only allow for a single gripping motion, easily increase fatigue in the patient's palm and make it difficult to exercise the fingers. The invention includes an upper hemisphere and a lower hemisphere, connected by a fist-rebounding component. A finger pressing component is arranged on the top of the upper hemisphere, and a telescopic adjustment component is arranged inside the lower hemisphere. The upper and lower hemispheres are adjusted and controlled by the telescopic adjustment component, allowing for both a close proximity state and a separated state. This invention has the advantages of allowing patients to exercise with a hollow fist, sensing the force of the fist grip by applying pressure to the grip strength ball to assess the degree of rehabilitation, and simultaneously facilitating finger flexibility exercises, thus meeting the needs of two types of rehabilitation exercises.