The suspension system is floorboard of the connection device between the frame and wheel axle or all the force, its function is to transfer function between the wheel and the frame of force and moment, and buffer by the uneven road surface to the impact of the frame or body, and the attenuation of the resulting vibration, in order to make sure the car was going smoothly.
In general, the automobile suspension system can be divided into the independent suspension and independent suspension, the independent suspension of the wheels on both ends of a whole axle, when the wheel side beat the other side wheels also beat accordingly, make whole body vibration or inclination;Independent suspension axle is divided into two sections, each wheel under the spiral spring independent by the installation of the frame, when the side wheels to beat the other side of the wheel is not affected, can the wheels on both sides of the independence movement, improve the stability and comfort of a car.As people demand for the car ride comfort and manipulation stability becomes more and more high, the independent suspension system already was washed out gradually
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A large number of portable, hand-held, and highly-specified instrumentation have developed With the development of production and the improvement of the general living standard, people are increasingly concerned about their own quality of life and health, and instruments for detecting various types of goods and foods that are closely related to people’s lives. Instruments, various medical instruments for preventing and treating diseases are an urgent trend. The on-site and real-time onlineization of scientific instruments, especially the health conditions and disease warning instruments used by families and individuals, will be greatly developed.
The Chinese instrumentation market in 2011 may not have a gratifying growth rate as in 2010, but it will still be a steady growth trend. In the first five months of this year, the investment in the instrumentation industry and the dull construction industry was 11.6 billion yuan, a year-on-year increase of 39%. According to the customs data, the export volume of instruments and meters in the first quarter was US$9.441 billion, an increase of 40.2% year-on-year. The amount of imports in the first quarter was US$17.77 billion, a year-on-year increase of 35%.
The emergence of digital skills has improved measurement control accuracy, sensitivity, speed, and reliability of analog instruments by several orders of magnitude, laying a delicate foundation for automating measurement control. The introduction of the computer led to a qualitative change in the results of the instrument, from the measurement of individual parameters to the measurement of the characteristic parameters of the full-scale system, from the adoption of pure helium to the transformation of the performance to control, elucidation, processing, calculation and performance output. Measurements are transformed with a single instrument to measurements with a measurement system. In the 90s, the breakthrough of measurement control and instrumentation science and technology is willing to advance the degree of intelligentization of instrumentation; a large number of DSP chips have been introduced, which has greatly enhanced the digital flag signal processing of instruments and meters; the development of micro-computers has enabled instrumentation to have Stronger data processing skills and image processing results; Fieldbus skills are a collection of communication skills developed for various on-site automatic outfitting devices and their control systems developed in Mali in the 1990s. Internet and Intranet skills will also enter the control range. . Today's instrumentation products will be developed in the direction of digitization, acquisition, intelligence, and integration. Interdisciplinary communal plans and high-precision construction skills will enable them to be more quickly, more sensitively, more reliably, and more succinctly available. Elucidate, detect, and control everything in motion.
In detail, the domestic development trend of measurement control and instrumentation can be summarized as follows:
The continuous improvement of the skills policy is just like the olympic slogan of the Olympic Games is higher, faster, and stronger. Measurement and control and instrumentation are eternal pursuits in improving the skill guidelines and results of measurement and control, and the skill guidelines for measurement control and instrumentation. It is a national quantification marker for measurement control and instrumentation. To broaden the scope of the test, for example, if the voltage is from nanovolt to 1 million volts; the resistance is from superconductivity to 1014 ohms. In terms of improving the accuracy of measurement, the measurement of property parameters has progressed to more than 0.02%, and the measurement of aerospace parameters has reached more than 0.05%. The accuracy of measurement and the accuracy achieved by scientific instruments are advancing with the times. In terms of improving the sensitivity of measurement, it is more to the development of individual particles, molecules, and atomic levels. Improve measurement speed (response speed), static 0.1 ~ 0.02ms, dynamic 1us. Progressive reliability is generally 2 to 50,000 hours of petitions, and 250,000 hours of high reliability. Stability (yearly variation) <±0.05% (high precision instrument) or <±0.1% (general instrument). To improve the environmental adaptability of products, in accordance with the plea of ​​different users, there is the adaptability under the conditions of high temperature, high humidity, high dust, falling, vibration, impact, electromagnetic field, radiation, deep water, rain, high voltage, and low pressure.
A large number of new scientific research achievements and high-tech skills measurement control and instrumentation are used as the first-hand tools for mankind to comprehend the world and make a new world. They are the most basic tools for mankind to carry out scientific research and engineering skills. Humankind learned early on the principle that “workers must do something good and must first sharpen their toolsâ€, new scientific research achievements and inventions such as static and dynamic theory, cybernetics, practical systems engineering, micro and macro world research results and a large number of high-tech skills such as The weak flag flag extraction skills, machine software and hardware skills, acquisition skills, laser skills, superconducting skills, and nanotechnology all become the impetuses for the development of measurement control and instrumentation science skills. Instrumentation alone has become a highly skilled new product, and devices and systems that integrate the latest scientific and technological achievements such as new principles, new concepts, new skills, new materials, and new processes are emerging.
Micro-miniaturization of measurement units, intelligent measurement and control, and instrumentation use a large number of dynamic and static technology products such as new sensors, large-scale and super-category integrated circuits, computer systems, and expert systems, and they are constantly developing toward miniaturization and intelligentization. The "chip-type instrumentation," "chip implementation room," "chip system," etc., the miniaturization and intelligence of the measurement unit will be a long-term trend. From the perspective of manipulative skills, embedded miniaturization and intelligent measurement unit's embedded connection and networking manipulative skills are valued.
The scope of measurement and control extends to three-dimensional and universal, and the development of measurement control to systemization and collection continues to progress toward three-dimensional, universal, and even planetary development. The instrumentation and measurement and control devices are no longer in a single place. The form of the device must be developed toward the systematization and acquisition of the measurement and control device. For example, for a large-scale hydropower station monitoring and control system, there are thousands of sensors that only measure the safety of dams. In addition, the detection and control points (I/O monitoring and control points) for the status of each generator set and the water level environment will exceed 10,000 points. The normal power generation and transmission of hydropower stations must form an organic measurement and control acquisition system for the measurement and control devices at each measurement and control point. Another example is the satellite measurement and control system. Thousands of sensors are deployed on the launch vehicle, and various observation and control devices on the satellite constitute a complete automatic measurement and control system. Then, a wide-area measurement and control system is formed by multiple ground-based measurement and control systems.
The status quo of domestic instrumentation skills and the latest development speed are relatively slow. At present, the status quo of China's instrumentation industry is complete, with certain industry roots. In developing countries, it is "upstream", but there is a clear gap between the country and the originating country. Due to the limitations of system methods, mechanisms, economic and scientific and technological level, management, and talents, enterprises are “multiple, scattered, and weakâ€. The technology is not strong enough, and there is a gap in product stability and reliability, and the market appears high-end products. Mainly in the form of foreign investment and imports, middle- and low-end products are dominated by venues dominated by Chinese-funded enterprises, and due to comparative advantages such as market scope, labor costs, and industry roots, some large and wide-ranging products will become production and export. The main force.
Driven by the necessity of the Fanyi market and guided by the national macro-control policies, the instrumentation industry in China has shown a rapid and healthy development. According to the initiatives of global instrument companies, it is not difficult for us to invent instrumental products that are digital, intelligent, and collected to become market leaders. In addition to the further progress of the product, engineering and style integration skills, software land requisition, operation and maintenance services will become new growth points in the industry.