共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
随着我国经济的快速发展,国家越来越重视现有内燃机的高温阀门的设计管理技术。在高温条件下,各种金属物质的特性和材料等都会受到外在因素的影响而导致其物理性能发生变化,且出现很明显的波动现象。这种高温阀门在设计结构上与低温阀门有着较大的区别性,对此本文主要针对现阶段的内燃机上的高分阀门的主要设计技术进行简要分析,并提出合理化建议。 相似文献
6.
8.
9.
10.
解读了API 6D和ASME B16.34新版中阀门设计标准的变化。提出了阀体按照ASME第Ⅷ卷锅炉压力容器的规定进行应力分析与强度设计的理念。 相似文献
11.
12.
Electromagnetic valve (EMV) actuation system is a new technology for improving fuel efficiency and at the same time reducing
emissions in internal combustion engines. It can provide more flexibility in valve event control compared with conventional
variable valve actuation devices. The electromagnetic valve actuator must be designed by taking the operating conditions and
engine geometry limits of the internal combustion engine into account. To help develop a simple design method, this paper
presents a procedure for determine the basic design parameters and dimensions of the actuator from the relations of the valve
dynamics, electromagnetic circuit and thermal loading condition based on the lumped method. To verify the accuracy of the
lumped method analysis, experimental study is also carried out on a prototype actuator. It is found that there is a relatively
good agreement between the experimental data and the results of the proposed design procedure. Through the whole speed range,
the actuator maintains proper performances in valve timing and event control. 相似文献
13.
针对阀门制造系统要求,提出了基于Clinet/Server集成阀门设计系统企业级内部网络框架和系统体系结构,及系统实施的解决方案。 相似文献
14.
Tae Hee Lee 《Journal of Mechanical Science and Technology》1999,13(6):470-476
New adjoint variable method for design sensitivity analysis of distinct eigenvlaues and eigenvectors is presented. In the
viewpoint of efficiency for the design sensitivity analysis of eigenvectors especially, the developed adjoint variable method
is required to compute adjoint variables from simultaneous linear equations, the so-called adjoint equations, instead of linear
combination of eigenvectors. Once we obtain the adjoint variables, design sensitivity analysis of response function that is
given in terms of eigenvalues, eigenvectors and design variables can be computed directly. In this way, design sensitivity
analysis of eigenvectors can be obtained by using eigenvalues and their corresponding eigenvectors of the mode being differentiated
only. To verify the proposed method, numerical examples are demonstrated. This can have considerable impact on computer implementation
of the developed method in the design sensitivity analysis of eigenproblem needed for practical applications. 相似文献
15.
16.
17.
18.
In this paper, a method to obtain the sensitivity of eigenvalues and the random responses of the structure with uncertain
parameters is proposed. The concept of the proposed method is that the perturbed equation of each uncertain substructure is
obtained using the finite element method, and the perturbed equation of the overall structure is obtained using the mode synthesis
method. By this way, the reduced order perturbed equation of the uncertain system can be obtained. And the response of the
uncertain system is obtained using probability method. As a numerical example, a simple piping system is considered as an
example structure. The damping and spring constants of the support are considered as the uncertain parameters. Then the variations
of the eigenvalues, the correlation function and the power spectral density function of the responses are calculated. As a
result, the proposed method is considered to be useful technique to analyze the sensitivities of eigenvalues and random response
against random excitation in terms of the accuracy and the calculation time. 相似文献
19.
基于有限单元法的热风阀阀体模态和谐响应分析 总被引:2,自引:1,他引:2
采用有限元分析软件ANSYS对热风阀阀体进行了模态分析和谐响应分析。给出了阀体前4阶的固有频率和振型,并得出了前四阶固有频率下激振力和动应力问的关系。该分析方法和结论为阀体的消除焊接残余应力振动时效工艺提供了理论依据。 相似文献