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GB/T 3222-94 Acoustic Environmental Noise Measurement Method
，内容是GB/T 3222-94声学 环境噪声测量方法
In 1994, GB/T 3222 was released by the China National Standards on Acoustics to provide a standard method to measure sound levels in the environment. The standard was developed to meet the needs of new acoustic construction regulations in China and to reduc......
1068 
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Flowchart of PLC Fault Finding Method and Its Countermeasures
Flowchart for PLC Fault Finding and Strategies for Troubleshooting
PLC (Programmable Logic Controller) is an important device for automation systems and an essential part of the control system in industry. However, PLC fault finding can be a vexing problem due to the complexity of their programs,......
shifting mechanism
Variable Speed Control Mechanisms
Speed control mechanisms allow an engineer or technician to adjust the speed of mechanical systems like pumps and motors. There are several types of variable speed control mechanisms that can be utilized by engineers depending on the application and the specific ......
Characteristic Causes of Residual Shrinkage Cavity and Its Judgment and Treatment
Introduction
Remaining shrinkage hole is a common defect in castings, caused by a number of possible factors related to the manufacturing process. This paper attempts to thoroughly review the causes and prevention of remaining shrinkage hole defects in investment castings, and to discuss various ......
Spot welding process of commonly used metals (Part 2)
Spot welding technology for common metal
In electrical engineering, spot welding is a welding process used to join metal. It uses two metal studs or electrodes pressed against the two pieces of metal with an electric current passing through it to create a weld. Spot welding is used in the manufac......
Quenching medium
Quenching Media
Quenching is the rapid cooling of a metal part to obtain certain desired properties such as hardness. Quenching media is used to cool the metal part during the quenching process. The use of quenching media can affect the final properties of the part and must be chosen carefully to......
Welding of Large Stainless Steel Thin Wall Vessels
Welding of Large Stainless Steel Thin-walled Containers
Welding of large stainless steel thin-walled containers requires careful consideration in choice of materials and processes to ensure good weld quality. In this article, we will explain the various welding techniques available and their cons......
wind pressure balance law
Bernoullis Principle
Developed in the eighteenth century by Daniel Bernoulli, Bernoullis Principle states that when the speed of a fluid increases, the pressure exerted by the fluid decreases. The principle forms the basis for many practical applications, such as airplane wings, pumps, and even h......
Steel pipe rotation device
Steel Pipe Rotating Equipment
Steel pipe rotating equipment is an important piece of machinery used in the construction and maintenance of commercial and residential structures and is responsible for ensuring a structure’s strength and stability. It utilizes two different types of steel pipes to......
Solution to the problem of high-speed tapping
Solving the Problem of High-Speed Threading
High-speed threading is a difficult problem for many industries. Threading is a process in which two components are joined together in order to form a secure and permanent bond. High-speed threading is particularly challenging because of the very rapid ......
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