Actual Use Of Cummins Diesel Generators

As a related accessory of the engine, the bracket will produce certain vibration in operation, and the vibration of the engine itself, so the bracket system is greatly stimulated by the outside world when working. The rationality of its stiffness and structure has a great influence on its reliability and durability, as well as the vibration and noise performance of the system.

It is found that the fixed bolts of the generator bracket are broken in the actual use of the generator and the test of the bench performance. When further field inspections were carried out on several random samples of the model, all prototypes were found to have strong vibrations at engine speeds between 4000 and 4500 RPM. In view of this phenomenon, this paper makes an in-depth discussion with the help of Lms. Test laboratory and finite element analysis methods. It is considered that there are two main reasons for this kind of vibration: one is the existence of abnormal excitation source, the other is the existence of bad dynamic characteristics of structure or system, both of which exist simultaneously.

Experimental analysis of fracture of 2 scaffolds

In order to solve this problem, the vibration of the engine bracket is tested on the engine bench.

Sample preparation and sensor layout

The engine of the same model and the faulty bracket of the same model are assembled on the vehicle, and then a three-way acceleration sensor is installed on the cylinder block, bracket, generator and compressor respectively

support modal analysis

According to the above test results, it is suspected that the stiffness of the support system is not enough, and there are resonance points within the engine excitation frequency range of 25Hz~200Hz. In order to determine and improve the bracing system, modal analysis of the bracing system is carried out by using finite element method.

Establishment of finite element model

Since both the supporting plate and the adjusting bracket are sheet metal parts with a thickness of 4mm, the base plate is divided into grids in this paper, which simplifies the generator model and makes its mass and moment of inertia consistent with the measured data. In addition, the compressor is represented by mass points, and the measured mass and moment of inertia are filled in. Bolts are connected by RBE2.

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Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. established in 2006, is an manufacturer of diesel generator in China, which integrates design, supply, commissioning and maintenance of diesel generator set. Product covers Cummins, Perkins, Volvo, Yuchai, Shangchai, Deutz, Ricardo, MTU, Weichai etc. with power range 20kw-3000kw, and become their OEM factory and technology center.