In the domain of automatic visual inspection for miniature capacitor quality control, the task of accurately detecting defects presents a formidable challenge. This challenge stems primarily from the small size and limited sample availability of defective micro-capacitors, which leads to issues such as reduced detection accuracy and …
Projection welding by capacitor discharge produces a high and temperature-dependent deformation, which causes convergence problems in direct coupled numerical models. …
Automatic on-line detection of welding deviation based on machine vision is one of the key technologies of arc welding robot tracking welding, in which obtaining high quality weld pool image and accurate welding deviation detection algorithm are two important steps of tracking welding. Through the research and analysis of the weld pool image of gas metal …
2. Capacitor Discharge Welding (CDW) CDW belongs to the resistance welding processes and is mainly used for projection applications. Figure1shows, as an example, the welding current I and electrode force F as a function of time t for one of the conducted experiments. With the starting time t0 (t = 0ms) the current flow starts. At tp
The cascaded H-bridge (CHB) static synchronous compensator (STATCOM) has been widely used in wind farm and conflux station. As the grid-connected voltage increases, the number of CHB proportionately increases. In order to achieve the capacitor voltage balance, it is necessary to independently detect the capacitor voltage of all H-bridge …
Abstract: The capacitor discharge welding (CDW) is a resistance welding process that excels through brief process times, low thermal stress, and good automation potential. …
Resistance spot welding poses potential challenges for automotive manufacturing enterprises with regard to ensuring the real-time and accurate quality detection of each welding spot. Nowadays, many …
To identify abnormal capacitors, a condition monitoring method for capacitors is proposed in this paper using the cumulative sum detection of the sliding window algorithm. First, the bilateral cumulative sum algorithm of the sliding window is proposed to extract the switch-on time and switch-off time of the submodules (SMs).
A framework and measurement method of a light source and make a cheap and efficient lighting system and a fusion algorithm based on machine learning and morphology for polarity detection of plug-in capacitors for PCB defect detection. Defect detection is a critical element in the PCB manufacturing process. Different from surface …
This project aims to achieve fault detection of bare PCBs through two different methods; the traditional algorithmic approach using image processing, which makes use of image subtraction method ...
Presently, quality inspection methods for SMT components after welding include automated optical inspection (AOI), x-ray detection (to detect the internal flaws …
China and State Grid Anhui Electric Power Company Electric Power Research Institute
A typical example is shown in the block diagram of Figure 2. It consists of a power circuit capable of switching both halves of the AC line voltage (Fig. 2A), a zero voltage detection circuit for synchronizing switching of the power circuit, a timing circuit to trigger the power circuit for the desired amount of weld time, and a welding transformer to convert high …
A method for monitoring the metering performance of an EVT on-line based on cyber-physics correlation analysis based on electrical and physical properties of a substation running in three-phase symmetry is proposed.
Keywords: Capacitor energy, Spot welding apparatus, Numerical method, Welding, Discharge time. 1 Calculation of the energy of capacitors 1.1 Formulation of the problem An adjustable spot welding apparatus [1], developed by a team of authors, belongs to the type of semiautomatic devices and is implemented in a capacitor method without
To enhance the safety and comfort of vehicle travel, detecting pavement cracks is a critical task in road management. This article introduces an advanced single-stage target detection method utilizing the YOLOv5s algorithm to enhance real-time performance and accuracy.
Learn more about the differences between Drawn Arc, Short Cycle, and Capacitor Discharge (CD) stud welding methods. Capacitor Discharge (CD) Stud Welding: Capacitors are charged to a predetermined setting on the power supply. When triggered, the stored energy is "discharged" and the burst of electricity creates the molten pool.
Japanese Laid-Open Patent Application No. 2000-173428 (JP, P2000-173428A) describes a constitution such that a first welding detection circuit using a photo-coupler including a …
Fast Plug-in Capacitors Polarity Detection with Morphology and SVM Fusion Method in Automatic Optical Inspection System November 2022 DOI: 10.21203/rs.3.rs-2233925/v1
Capacitor discharge (CD) stud welding is a common and fast connection technology. This paper presents an experimental and simulation study of the stud weld joint of copper stud and carbon plate.
The flowchart of the proposed algorithm is shown in Fig. 4.According to the block diagram of the algorithm shown in Fig. 4, if the power swing is detected, the relay starts to calculate the fault detection index.If the index for the fault detection exceeds the defined threshold, a fault is detected.
As a component widely used in electronic products, Printed Circuit Board(PCB) plays an extremely important role in our life. Due to technical limitations, PCB with defects will inevitably appear in the production process. In order to ensure high yield and save labor cost, this paper applied two kinds of target detection network to PCB …
A method for detecting a welding of a relay contact in a circuit having a DC power supply; a load circuit; a first main relay and a second main relay respectively inserted in a pair of power supply lines disposed between the DC power supply and the load circuit; and a precharge relay which is provided in parallel to the contact of the first main relay has the …
Capacitor discharge welding (CDW) is analysed to repair aeronautical components made with Inconel 718 and Ti6Al4V alloys, currently used for compressor …
Under dynamic conditions, the response time of traditional voltage detection methods is relatively lengthy, leading to overshoots in the DC-link voltage of single-phase power converters, which significantly degrades system performance. This study proposes a rapid voltage transient detection method based on reduced-order …
The automatic detection system proposed in this paper mainly focuses on automatic welding errors detection for tantalum capacitors. Without manual labeling standard PCBs, it can automatically determine the positions and directions of the tantalum capacitors in PCBs and implement automatic labeling by means of segmentation, coarse-fine …
The invention relates to the field of capacitor welding detection, in particular to a system and a method for detecting capacitor welding quality, which realize automatic …
A relay contact welding detection method for use in a circuit including a DC power supply, a load circuit, first and second main relays inserted in a pair of respective power supply lines between the DC power supply and the load circuit, and a pre-charge relay disposed in parallel with the contacts of the first main relay, comprising a step of …
Capacitor discharge welding (CDW) is characterized by a pulsed electrical current profile. It is primarily utilized for resistance projection welding tasks, …
Power devices may become damaged or even fail completely due to over-current caused by external factors such as ac line transients, mechanical overload, misfiring, inverter shoot-through, etc. Some of these incidents can result in a very high current (few times higher than the system''s rated current) flow through the electrical drive system. Electrical machines …
Fast Plug-in Capacitors Polarity Detection with Morphology and SVM Fusion Method in Automatic Optical Inspection System November 2022 DOI: 10.21203/rs.3.rs-2233925/v1
We make contributions in the following two aspects: (1) a framework and measurement method of a light source and make a cheap and efficient lighting system; (2) a fusion algorithm based on machine ...
Types. film (13) metalized polypropylene film polypropylene film. electrolytic (3) aluminum. ... Welding Inverter Capacitor Series Welding Inverter DC Filter Capacitor Applications: Used in ... and coupling circuit, X-ray machine, CT machine equipment, instruments and meters, detection equipment, ignition coil, high-voltage generator ...
Although improved detection methods have made progress in industrial defect detection, there are still some issues. The methods compress the network model either in the backbone or neck to maintain detection accuracy without degradation. However, this does not completely reduce model computation, resulting in high model costs.
The study provides insight into the use of the multi-capacitor discharge welding method to join a combination of difficult-to-weld materials suitable for demanding industrial applications ...
Using image processing and machine learning methods, automatic detection of welding defects can be used for testing experiments using two and three classifications. Introducing support vector machine (SVM) [4] ... including those of capacitors and resistors; comprising 3013 images of SMT defects after reflow soldering …
This paper investigates a 110 kV on-site calibration system for EVTs, including a standard channel, a calibrated channel and a PC equipped with the LabView environment, and an adaptive full-phase discrete Fourier transform (DFT) algorithm is proposed to extract electrical parameters.
As a data-driven method, the method can identify the sudden failure in advance according to the variation of the characteristic parameters, and modify the model parameters continuously according to the actual aging state, so as to predict the remaining life. 3.1. Capacitor sudden failure detection method based on parameter mutation
Figure 1 Tom Snow, CEO, and Jeffrey Morgan, welding engineer, with resistance welding equipment supplier T.J. Snow, hold parts that have been formed using the capacitor discharge welding method. While not widely known in the U.S., the technology is quite popular among manufacturers of automotive transmission …
Capacitor Discharge Stud Welding (CDSW) is an advanced joining technique that utilizes a capacitor bank as its power source. This method rapidly discharges stored energy to generate a high …
Capacitor detection methods are mainly divided into three major categories: detection of variable capacitors, detection of electrolytic capacitors, and detection of fixed capacitors. 1. Detection of variable capacitors . A. Gently rotate the shaft by hand, it should feel very smooth, and should not feel sometimes loose or even …
several elements and provide methods and criteria for detection and replacement of faulty units. 5.2.3 External fuses Comments: External fuses are generally not recommended for DC capacitors . 5.2.4 Detection of element failures. Comments: In case the number of faulty elements will exceed acceptable limit, the faulty units shall be
Citation: HU Xi, YU Zhen, LIU Haisheng. Weld Surface Defect Detection Method based on Multi-feature Extraction and BT-SVM[J]. Mechanical Science and Technology for Aerospace Engineering, 2022, 41(10): 1615-1622. doi: 10.13433/j.cnki.1003-8728.20200474
The proposed fault detection method based on the Mathematical Morphology is introduced in detail. ... If a TCSC is used instead of a series capacitor, fault detection will be even more challenging. In TCSC-based compensated lines, due to nonlinear changes in the compensation level, when faults and power swings occur, the …
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