Naohide MIZUKUCHI, Takurou MATSUMOTO, Kazumasa IDA
{"title":"接触形渦巻ばねの自由状態に関する考察","authors":"Naohide MIZUKUCHI, Takurou MATSUMOTO, Kazumasa IDA","doi":"10.5346/trbane.2023.83","DOIUrl":"https://doi.org/10.5346/trbane.2023.83","url":null,"abstract":"There are two types of contact-type spiral springs: a spring without a primary winding in which the free state has a spiral shape and an S-shaped spring in which the free state has an S-shape. In order to accurately predict the torque characteristics of these springs, it is essential to estimate the free state by highly accurate elastic-plastic analysis. However, it is difficult to create a highly accurate material model because the amount of change in strain varies from the inner end to the outer end of the spring. It is also necessary to consider the effects of the primary winding process and the heat treatment process. In this paper, we first clarify the elastic-plastic deformation behavior of contact-type spiral springs during winding. For contact-type spiral springs with various dimensions or different primary windings, the deformation during winding was collected as the curvature during winding and the curvature in the free state after winding. These data are converted from curvature to surface strain to make non-dimensional parameter, and then organized considering the initial curvature derived from the primary winding of S-shaped spring. As a result, it was found that the elastic-plastic deformation in winding can be comprehensively expressed without depending on the type of spring.","PeriodicalId":498557,"journal":{"name":"Transactions of Japan Society of Spring Engineers","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135951109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"2DOF (2自由度) 直鎖ばねに近似された不減衰弁ばねのサージングを制振するカム関数の導出","authors":"Shohei HIBINO, Shigeo KOTAKE","doi":"10.5346/trbane.2023.69","DOIUrl":"https://doi.org/10.5346/trbane.2023.69","url":null,"abstract":"To reduce surging of a valve spring in a reciprocal engine, we design cam functions that simultaneously damp two natural frequencies of the spring by modeling it into a series undamped 2DOF bead-spring-chain system. The cam functions are defined from a finite-time-settling function termed vibration manipulation function (VMF), which consists of half-integer trigonal functions in an arbitrary rising time. The obtained analytical conditions of the valve spring decide specific rising times of the cam. In simulations, we ascertained simultaneous suppression of the residual vibrations of two natural frequencies during translational motions of the 2DOF valve spring lifted with a designed two-dwell cam.","PeriodicalId":498557,"journal":{"name":"Transactions of Japan Society of Spring Engineers","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135951113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Theoretical Analysis on Postbuckled Large Deformation and Subsequent Contact in a Spring-hinged Beam with Changing Length","authors":"Atsumi OHTSUKI, Takashi NAGAO","doi":"10.5346/trbane.2023.37","DOIUrl":"https://doi.org/10.5346/trbane.2023.37","url":null,"abstract":"Large deformations with contact area occurring in flexible beams such as bellows used for zigzag springs and flexible vessels, pipes etc., have a structure that absorbs large relative displacements. Large deformations with contact area occurs in folding process of paper and woven fabric, and are investigated both theoretically and experimentally. The analysis is based on an assumption that geometrical nonlinearity arises as the result of large deformations, while the material remains in linearly elastic status. In this paper, a slender beam is subjected to compressive forces at spring-hinged ends. Several theoretical solutions are obtained in terms of elliptic integrals. Representative parameters such as the arc length, deflection, curvature, bending moment and bending stress are presented in terms of these integrals. The predicted results are compared with the experimental data and both are found to be in fairly good agreement with each other.","PeriodicalId":498557,"journal":{"name":"Transactions of Japan Society of Spring Engineers","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135950484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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