Liu Li

Bio: Liu Li is an academic researcher. The author has contributed to research in topics: Control theory. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Bed fatigue test controller for light, mechanical and electronic integration medical instrument

Abstract: The invention discloses a bed fatigue test controller for a light, mechanical and electronic integration medical instrument, belonging to the technical field of light, mechanical and electronic integration. The bed fatigue test controller comprises a base, wherein support pillars are respectively arranged on the left side and the right side of the bottom part of the base; support frames are respectively arranged on the left side and the right side of the top part of the base. Compared with an existing bed fatigue test controller for the light, mechanical and electronic integration medical instrument, the bed fatigue test controller for the light, mechanical and electronic integration medical instrument, provided by the invention, adopts ultrasonic fatigue testing; compared with other fatigue testing machines, the test frequency of an ultrasonic fatigue testing machine is larger, so that a test result is more accurate; in addition, on the basis of the existing bed fatigue test controller for the mechanical and electronic integration medical instrument, an image acquisition sub-system and an image analysis sub-system are added, so that a direction and speed of crack propagation of a sample can be analyzed and calculated through real-time monitoring the sample when the sample is subjected to fatigue test, the force analysis is cooperatively carried out on the sample, and thus analyzed data is more accurate.

Intelligent bed ageing cyclic test method and system capable of simulating load bearing

Abstract: The invention discloses an intelligent bed ageing cyclic test method and system capable of simulating load bearing. A mattress is placed on a tested bed board, and a sandbag is placed at a corresponding position on the mattress, thus a state of a person sleeping on the mattress is simulated; number of times of operation of the tested bed board is measured by virtue of a counting device; accordingto a preset run program of a programmable remote control, cycle run of an intelligent bed is realized; and a placement location of the sandbag is changed when the tested bed board runs for a corresponding number to times, thus running condition of the intelligent bed is simulated and detected by virtue of the series of steps. By virtue of accurate measurement and simulation of the load bearing, structural strength and ageing condition of the intelligent bed can be accurately known, a data reference is provided for further improvement of the intelligent bed, and a designer can beneficially design an intelligent bed with better performance.

High-frequency fatigue test device and method based on piezoelectric double-stack resonance driving

Abstract: The invention discloses a high-frequency fatigue test device and method based on piezoelectric double-stack resonance driving. According to the invention, two symmetrical piezoelectric stack transducers are used as a driving device, are connected with the two ends of the fatigue test piece to be tested in a mechanical clamping mode to form a dumbbell type structure, the resonant frequency of the system is effectively reduced while the length of the fatigue test piece to be tested is not increased, and the first-order resonant frequency of the whole system can be controlled to range from 1 kHzto 3 kHz. A high-voltage power supply applies alternating voltage consistent with the first-order resonant frequency of the test system to the piezoelectric double stack, the test system generates first-order resonance, and the point with the maximum stress amplitude is taken as the central point of the tested fatigue test piece. Compared with a traditional fatigue testing machine, the fatigue testing machine has the advantages that the testing frequency is greatly improved, the testing time is shortened, and the testing energy consumption is remarkably reduced; and compared with an ultrasonicfatigue testing machine, the testing frequency is greatly reduced, the heating value is reduced, and the testing environment is more appropriate to the actual working condition.

Service life test device and service life test system

Abstract: The invention provides a service life test device and a service life test system. The service life test device comprises a test platform, a mounting seat, a slider assembly, a linear sliding table, pressure assemblies and a mounting part. A piece to be tested drives a test piece to rotate at a certain angle, so as to drive the slider assembly to perform linear reciprocating motion. When the sliderassembly deviates from an equilibrium position, the pressure assemblies on both sides apply a load force during a simulated operation, and the load force is transmitted to the piece to be tested through the slider assembly. The load of the piece to be tested during a cutting process is simulated. Automatic test of the overall service life cycle of a medical instrument is realized. The test efficiency and precision are improved. A large amount of human and material resources are saved.