Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed are a fault identification and state monitoring system and method for a multi-channel piezoelectric 3D printing spray head. The system comprises a spray head driving circuit, a multi-channel gating circuit, a piezoelectric signal acquisition circuit and a monitoring unit. The spray head driving circuit is used for providing a driving signal to enable a piezoelectric spray head to perform spraying; the multi-channel gating circuit is used for providing a multi-channel in-turn gating signal to realize in-turn monitoring of a plurality of spray holes of the piezoelectric spray head; the piezoelectric signal acquisition circuit uses a self-sensing detection method to acquire a residual vibration signal in a runner cavity of the piezoelectric spray head; and the monitoring unit comprises a driving voltage monitoring module, a liquid viscosity monitoring module, an ink supply pressure monitoring module and a liquid drop spray speed calculation module, and is used for monitoring the working state of the piezoelectric spray head. The system and method can effectively identify the type and cause of a fault, improve monitoring accuracy and facilitate a user in taking effective measures; no external sensor is required; in-turn monitoring reduces the hardware cost; and monitoring can be performed during a working process of a spray head, and the monitoring flexibility is improved.
A: A bearing status online monitoring system based on optical fiber vibration sensing, comprising: a laser generating device (1) for emitting a pulsed laser to a circulator (3); an optical scanning device (4) for time-divisionally inputting the pulsed laser coming from the circulator (3) into a plurality of vibration sensing optical cables (5), each vibration sensing optical cable (5) of the plurality of vibration sensing optical cables (5) being used for sensing the vibration of one or more bearings; scattered light signals which are transmitted from the plurality of vibration sensing optical cables (5) and carry bearing vibration information being inputted into a photodetector (8) via the optical scanning device (4) and the circulator (3), the photodetector (8) converting the scattered light signals into electric signals and transmitting the electric signals into a signal acquiring and processing module (9), the signal acquiring and processing module (9) being used for processing the electric signals and determining, according to the electric signals, the operating status of the bearings. The plurality of vibration sensing optical cables (5) is formed in parallel. The invention can reduce the length of each vibration sensing optical cable, improve the sensitivity of the monitoring system, and reduce the cost of the monitoring system. Further provided is a bearing status online monitoring method based on optical fiber vibration sensing.
B: A pressure touch control display apparatus and a control method therefor. The pressure touch control display apparatus comprises a backlight module (10), a piezoelectric component (20) and a monitoring circuit, wherein the piezoelectric component (20) is arranged on a reflection sheet (12) of the backlight module (10), and the piezoelectric component (20) is deformed under the action of a pressure and generates an electrical signal corresponding to the pressure; and the monitoring circuit is electrically connected to the piezoelectric component (20), and the monitoring circuit is used for monitoring the electrical signal generated by the piezoelectric component (20). In the pressure touch control display apparatus, it is not necessary to pre-apply a reference electrical signal when the piezoelectric component (20) is working, and thus during working the piezoelectric component (20) is not interfered with by the other electrical signals in the pressure touch control display apparatus and external electrical signals, such that the pressure touch control display apparatus has a relatively high anti-interference capability, and the sensitivity and accuracy of the pressure touch control display apparatus are improved.
C: A status monitoring and fault diagnosis system for concrete pumping equipment, comprising a boom sensor assembly (210) installed on the boom for monitoring the operation status of the boom and acquiring a signal, a chassis sensor assembly (220) installed on a chassis (101) for monitoring the operation status of the chassis (101) and acquiring a signal, a hydraulic system sensor assembly (230) installed on a hydraulic system for monitoring the operation status of the hydraulic system and acquiring a signal, a status monitoring unit (310) for analyzing and processing the signals acquired by each sensor assembly so as to monitor the condition of the concrete pumping equipment on line, and a fault diagnosis unit (320) connected with the status monitoring unit (310) for predicting and diagnosing the fault of the concrete pumping equipment. The status monitoring and fault diagnosis system for concrete pumping equipment can comprehensively monitor the operation status and diagnose the fault of the boom, the chassis and the hydraulic system, thus improving the overall performance of the concrete pumping equipment.
D: Disclosed are an ink-jet control circuit for a 3D printing device, and a 3D printing device. The ink-jet control circuit comprises a positioning module, a control module, a row counting module, a storage module, and a data carrying module, wherein the positioning module is used for acquiring position data of a nozzle; the control module is used for generating a row synchronization signal and an ink-jet enabling signal according to the position data of the nozzle; the row counting module is used for generating a row counting value according to the row synchronization signal and the ink-jet enabling signal; the storage module is used for storing printing data; and the data carrying module is used for generating non-printing data, and is used for sending the printing data or the non-printing data to the nozzle according to the row counting value, so as to control the nozzle to jet ink droplets. The control module of the present application only needs to process the printing data rather than the non-printing data, such that the amount of data processed by the control module is effectively reduced, reducing the load of the control module and thus improving data processing efficiency of the control module.
Answer: D