First, the formula:
1，η=(wusful/w total)× 100%。
2.η = g substance /(nF).
3.η = g object /(G object +g motion).
4.η = f/(nf) η = g east-west h/(FL).
5, w total = w with +w extra.
Second, put forward:
The formula of mechanical efficiency was put forward by Leibniz in 1694. At that time, Leibniz served as the first president of Berlin Academy of Sciences, and put forward the concept of efficiency and the prototype of mechanical efficiency theorem. In a paper published by 1695, he put forward the conservation of mechanical efficiency of the product of force and distance more clearly.
Third, the principle:
The principle of mechanical efficiency formula is that no machine is labor-saving. This principle can be traced back to the concepts of work and power in physics. According to these concepts, it is inevitable that any machine will consume energy during operation. Therefore, the output work of any machine is always less than or equal to its input work.
Related factors and application fields of mechanical efficiency
I. Relevant factors:
1, the design and structure of the machine itself: different mechanical designs will bring different mechanical efficiency, such as pulley blocks, levers, ramps and other different forms of machinery, and their efficiency will be different.
2. Working conditions and working environment of machinery: for example, the load size, rotating speed and working temperature of machinery will affect the efficiency of machinery.
3. Mechanical maintenance: Good maintenance can reduce mechanical friction and energy loss and improve mechanical efficiency.
4. Material and quality of machinery: High-quality materials can ensure high efficiency and high performance of machinery.
Second, the application field:
1. Industrial field: In industrial production, the efficiency of mechanical equipment is very important for production efficiency. By calculating the mechanical efficiency, we can evaluate the performance of the equipment, optimize the operation of the equipment and improve the production efficiency.
2. Energy field: Energy efficiency is one of the research hotspots. Calculating mechanical efficiency is helpful to evaluate the efficiency of energy conversion equipment and guide the optimization of energy utilization.
3. Transportation field: In the transportation field, the efficiency of mechanical equipment is directly related to energy consumption and carbon emissions. By calculating the mechanical efficiency, we can evaluate the energy utilization of vehicles and promote the development of green transportation.
4. Engineering field: In the engineering field, mechanical efficiency is one of the important indexes to evaluate the performance of mechanical systems. Such as bridges, architecture, aerospace and other fields, we need to consider mechanical efficiency.
5. Environmental field: In the environmental field, mechanical efficiency is also of great significance. For example, in environmental protection projects such as sewage treatment and garbage disposal, the operation of equipment can be optimized and the environmental protection effect can be improved by calculating the mechanical efficiency.